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SIPROTEC 4 7SJ61/62/63 / 6MD63
M ultifunction Protection Relay and Bay Controller
Description
Application
The SIPROTEC 4 units are numerical relays that also perform control and monitor-ing functions and therefore support the user in cost-effective power system man-agement, and ensure reliable supply of electric pow er to the customers. Local opera-tion has been designed ac-cording to ergonomic criteria. Large, easy-to-read displays w ere a major design aim. The SIPROTEC 4 units have a uniform design and a degree of functionality w hich repre-sents a whole new quality in protection and control. The use of a pow erful micro-controller and the application of digital measured value conditioning and processing largely suppresses the influ-ence of higher-frequency transient phenomena and DC components. The protective functions evaluate t he funda-mental wave. The overload protection evaluates r.m.s. values.
Programmable logic
The integrated logic charac-teristics allow the user to im-plement his own functions for automation of sw itchgear (interlocking) or a substation via a graphic user interface. The user can also generate user-defined messages.
Communication
The SIPROTEC 4 units pos-sess up to t hree serial inter-faces:
− Front int erface for connect-ing a PC
− System interface for con-necting to a control system via IEC 60870-5-103 or Profibus-FMS/DP, Modbus RTU, DNP 3.0
− Data t ransmission − Time synchronization via
binary input IRIG B/SCADA (DCF 77)
− Prepared for UCA, Ethernet
Line protection
The SIPROTEC 4 units can be used for line protection of high and medium voltage networks w ith grounded (earthed), low-resistance grounded, isolated or compensated neutral point.
Motor protection
For motor protection, the SIPROTEC 4 units are suitable for asynchronous machines of all sizes.
Transformer protection
The SIPROTEC 4 units perform all functions of back-up protec-tion supplementary to t rans-former differential protection. The inrush suppression effec-tively prevents tripping by inrush currents.
Back-up protection
The SIPROTEC 4 units can be used universally for back-up protection.
Control
The integrated control function permits control of disconnect de-vices (electrically operated/mo-torized switches) or circuit-breakers via the integrated oper-ator panel, binary inputs, DIGSI 4 or the control and protection sys-tem (e.g. SICAM). They support substations wit h single and du-plicate busbars. The number of elements t hat can be controlled (usually 1 to 5) is only restricted by the number of input s and out-puts available.
A full range of command proc-essing functions are provided.
Application matrix 7 S J 5 1 1 7 S J 5 1 2 7 S J 5 3 1 7 S J 6 0 1 7 S J 6 0 0 7 S J 6 0 2 7 S J 6 1 7 S J 6 2 7 S J 6 3 6 M D 6 3 6 M D 5 2 5 Overcurrent protection Directional OC protection Sensitive ground-fault detection Motor protection Voltage/frequency protection Additional functions Measuring functions Double busbar MODEM/remote control Local control Communication not included $ $ § § § $ % % % ! ! ! $ § ! ! ! ! % % ! ! ! % % ! ! ! " % % ! ! ! ! $ ! " " % % % ! ! ! ! § ! ! ! ! % % ! ! ! ! § ! " " $ % % ! ! " § $ " " " $ % % % ! " " " ! " " " " % % " ! ! § ! ! " $ $ % % § ! ! $ ! ! " § § % % ! § § § ! " § % % % % § ! " applicable basic function extended function full function § $ %
Time synchronization
A battery-backed clock is a standard component and can be synchronized via a syn-chronization signal (DCF77, IRIG B via satellite receiver), binary input, system int er-face or SCADA (e.g. SICAM ). A date and time is assigned to every indication.
Selectable binary inputs and outputs
Binary inputs, outputs and LEDs can be assigned to per-form specific functions as de-fined by the user.
Selectable function keys
Four function keys can be as-signed to permit the user to perform f requently recurring actions very quickly and sim-ply.
Typical applications are, for example, jumps to a given position in the menu tree in order to display the list of op-erating indications or to per-form automatic functions, such as “ Switching of circuit-breaker” .
Continuous self-monitoring
The hardware and software are continuously monitored. If abnormal conditions are detected, the units signals immediately. In this w ay, a great degree of safety, relia-bility and availarelia-bility is achieved.
Reliable battery monitoring
The battery that is provided is used to back-up the clock, switching statistics, the status and fault indications and the fault recording in the event of a power supply fail-ure. Its function is checked by the processor at regular intervals. If the capacity of the battery is found to be de-clining, an alarm is gener-ated. Regular replacement is therefore not necessary. All setting parameters are stored in t he Flash-EPROM which are not lost if the power supply or battery fails. The SIPROTEC 4 unit re-mains fully functional.
Protection functions
The SIPROTEC 4 units are available with a variety of protective funct ions. Pre -defined application packages can be implemented to make selection easier for the user.
Metering values
Extensive measured values, limit values and metered val-ues permit improved system management, as w ell as sim-plified commissioning.
Transducer
Uses two 4 to 20 mA input interfaces.
Operational indications Indications with t ime stamp
The SIPROTEC 4 units provide extensive data for fault analysis, as well as con-trol. All indications listed below are protected against power supply failure.
Fault signals
The last eight fault cases and 3 sensitive ground f ault cases are always stored in the unit. All fault recordings are time stamped wit h a resolution of 1 msec.
Operational indications All indications that are not directly associated with the fault (e.g. operating or switching actions) are stored in the status indica-tion buffer. The time resolu-tion is 1 ms, buffer size: 80 indications.
Fault recording up to 5 sec-onds
The digitized values for phase currents, ground (earth) currents, line and zero-sequence current s are recorded in a fault recording. The record can be started using a binary input, on initia-tion or w hen a trip command output occurs. Up to eight fault recordings may be stored. For test purposes, it is possible to start a fault re-cording via DIGSI 4 or the connected control and pro-tection system.
Fig. 1
Single-line diagram
n
Description
Operation
User-friendly local opera-tion
M any advantages are already to be found on the clear and user-friendly front panel:
Positioning and grouping of the keys supports the natu-ral operating process Large non-reflective back-lit display
Programmable (freely as-signable) LEDs for impor-tant messages
Arrows arrangement of the keys for easy navigation in the function tree
Operator-friendly input of the setting values via the numeric keys or DIGSI 4 Command input protected by key lock (6M D63/7SJ63 only) or password
Four programmable keys for frequently used func-tions >at the press of a but-ton<
Local operation
All operator actions can be executed and information displayed on an integrated user interface:
Four configurable function keys permit the user to execute frequently used actions fast and simple. Typical applications include jum ps to certain points in the menu tree to display the operational measured values, or execution of automatic functions such as: “ Operate the circuit-breaker”
Keys for navigation
Fig. 3
Example for application of F keys
RS232 operator interface
v
SIPROTEC 4 7SJ61/62/63 / 6MD63
M ultifunction Protection Relay and Bay Controller
Numerical keys for data entry
L S P 2 0 5 9 u s a . t i f Measured values Disturbance CLOSE OPEN L S P 2 0 9 8 u s a . e p s n n n n n n n n J
On the LCD display, process and device infor-mation can be displayed as text in various lists. Frequently displayed information in-cludes measured analog values, metered val-ues, binary information about the state of the switchgear and the device, protection infor-mation, general indications and alarms.
Seven configurable (parameterizable) LEDs are used to display any process or device in-formation. The LEDs can be labeled based on user requirements. An LED reset key resets the LEDs. Fig. 2 SIPROTEC4 7SJ61/62 J I I I
On the large LCD display process and device inform ation can be displayed as a one-line diagram or as text in dif-ferent lists. Frequently displayed information includes measured analog values, metered values, binary infor-mation about the status of the switchgear and the de-vices, protection information, general indications and alarms.
Local operation
All operator actions can be executed and information displayed on an integrated user interface:
The keys for navigating in the menu of the function tree, the one-line diagram or entering values are positioned from top to bottom on an axis to the right of the display.
Below the LCD there are highlighted keys used for controlling the process. For typical switching operations, these keys are used from left to right.
Four configurable function keys permit the user to initiate frequently used actions fast and simply. Typical applications include jumps to certain points in the menu tree to display the list of operational measured values, or execution of automatic functions such as applying safety grounds.
14 configurable LEDs are used to display any process or device information. The LEDs can be labeled application-specifically. An LED reset key resets the LEDs.
Two key sw itches ensure fast and reliable access to “ switch betw een local and remote control” and “ switch between interlocked and non-interlocked operation“ .
Fig. 4 SIPROTEC4 7SJ63/6MD63 L S P 2 0 5 7 u s a . t i f RS232 operator interface Numerical keys for data entry
J I I I I I I J
DIGSI 4 Operating program
DIGSI 4, the PC program for operating SIPROTEC 4 under M S Windows 95/98/ NT 4.0
The PC operating program DIGSI 4 is the interface between the user and the SIPROTEC 4 units. It has a modern, intuitive operator in-terface. With DIGSI 4, the SIPROTEC 4 unit s can be configured and queried - it is a tailored program for t he energy and manufacturing supply industries.
DIGSI 4 matrix
The DIGSI 4 matrix allows the user to see the overall view of the unit configuration at a glance. For example, you can display all the LEDs that have binary inputs or show any indication that are con-nected to the relay. And with one click of the butt on con-nections can be switched.
Fig. 5
DIGSI 4 allocation matrix
Fig. 6
Substation manager for managing of substation and device data
L S P 2 1 2 9 f . t i f L S P 2 1 2 1 f . t i f Fig. 7
Range of operational measured values Fig. 8 Function range L S P 2 1 2 3 f . t i f
SIPROTEC 4 7SJ61/62/63 / 6MD63
M ultifunction Protection Relay and Bay Controller
L S P 2 1 2 0 f . t i f L S P 2 1 2 2 f . t i f
Siemens SIP 3.1⋅1999 7
Siemens SIP 3.1⋅1999 7
Fig. 11
CFC logic with module library
L S P 2 1 0 4 f . t i f Fig. 9 Display Editor L S P 2 0 2 5 f . t i f L S P 2 1 2 8 f . t i f Fig. 10 Commissioning aid Display editor
A display editor is available to design the display on
SIPROTEC 4 units. The pre-defined symbol sets can be expanded to suit the user. The drawing of an one-line di-agram is extremely simple. Operational measured values (analog values) in the unit can be placed where required.
Commissioning
Special attention has been paid to commissioning. All bi-nary inputs and outputs can be read and set directly. This can simplify t he wire check-ing process significantly f or the user.
CFC: Reduced time and planning for programming logic
With the help of t he CFC (Continuous Function Chart), you can configure interlocks and switching sequences simply by drawing the logic sequences; no special knowl-edge of softw are is required. Logical elements, such as AND, OR and time elements, measured limit values, etc. are available.
Use the true f ull PLC func-tionality according to IEC to reduce time and planning.
The new DIGSI 4
n
Easy to learn
n
Clear layout of routing matrix
n
Substation, feeder and equipment
data management
n
Password protection
n
Linked w ith the SICAM /SIM ATIC
software environment
~
SIPROTEC 4/ SICAM system/ SCADA
SIPROTEC 4 as integral part of SICAM energy automation system
SIPROTEC 4 is tailor-made for use in the SIMATIC-based SICAM energy automa-tion system.
The SICAM family consists of the fol-lowing components:
SICAM RTU, the modern telecontrol system with automation and PLC func-tions
SICAM SAS, the m odern integration of switchgear automation and informa-tion technology
SICAM PCC, the information and com-munication technology on a PC basis Softw are data management and com-munication is one of t he strong-points of combining of SICAM and SIPROTEC 4. Powerful engineering tools (SICAM plus TOOLS on the basis of STEP7 and SICAM WinCC) make working w ith SICAM convenient. The SIPROTEC 4 units are optimally matched for use in SICAM SAS and SICAM PCC.
Wit h SICAM and SIPROTEC 4 continuit y exists at three central points:
Data management Software architecture Communication.
All central system components (SICAM and SIPROTEC 4 CPUs, SICAM WinCC, SICAM plus TOOLS, bay controllers and protection equipment), as well as the DIGSI 4 operating program, are estab-lished on the same basis.
The interface and ability to link SICAM/ SIPROTEC and other components of the substation control, protection and auto-mation is assured via open interfaces, such as IEC 60870-5-103 or PROFIBUS.
Service bus
DIGSI 4 offers the additional possibility of accessing bay controllers via modem. It is possible to read out from t he office desk or when travelling (by laptop and modem) the operational and fault event logs, fault records, as well as opera-tional measured values of all protection devices of an installation. This permits rapid and extensive access for the serv-ice personnel.
Star coupler
All SIPROTEC units operate also with the proven star coupler. The star coupler is used for sim ple applications which also give the user an alternate method of retrieving information remotely.
Fig. 13
Systems control bus and service bus
Fig. 12
SICAM/SIPROTEC 4 architect ure
Office/SCADA Modem access Rear of unit SIPROTEC4 Front interface Rear of unit SIPROTEC4 Front interface Rear of unit SIPROTEC4 Front interface Systems control SICAM/ SIPROTEC4 Database SICAM WinCC DIGSI 4 SICAM plusTOOLS Bay control units
Data
mana-gement Software Communi-cation
IEC6 0870-5-103 Profibus FMS/DP Modbus RTU, DNP3.0 SCADA CPU Central input/output Protection devices IEC60870-5-103/Profibus-FMS /DP Modbus RTU
SIPROTEC 4 7SJ61/62/63 / 6MD63
M ultifunction Protection Relay and Bay Controller
Service vehicle DNP3.0 DIGSI 4 n n n n n n
Fig. 14
SICAM SAS
Fig. 15
Star coupler
SICAM WinCC
Operation and monitoring archive, configuration station
Telecontrol interf ace to system control centers (e.g. IEC 60870-5-101) DIGSI 4 PCor notebook Automation systems (e.g. SIMATIC) Time synchronization DGF, GPS SICAM SC IEC60870-5-103 Profibus FMS Control Protection/control
Prot ect ion 1) Prot ection and cont rol
in separate unit s 2) Protection and control
in one unit 7SJ600 7SA511 7UT51 SD51 7SJ51 6MB525 1) 2) 2) 1) 2) 1) 2) 1) 7SJ61/62 6M D/7SJ63 6M B525 7SJ61/62 6M D63 7SJ63 7SJ61/62 6MD63 IEC60870-5-103
With respect to communica-tion, particular emphasis is placed on the requirements customary in energy automa-tion:
Every data item is time-stamped at the source, i.e. where it originates.
The communication system automatically handles the transfer of large data blocks (e.g. fault recordings or pa-rameter data files). The user can apply these features without any additional programming ef-fort.
For the reliable execution of a command, the relevant signal is first acknowledged in the unit involved. When the command has been en-abled and executed, a check-back indication is is-sued. The actual conditions are checked at every com-mand handling step. When-ever they are not satisfied, controlled interruption is possible.
Local PC interface
The PC interface accessible from the front of the unit per-mits quick access to all pa-rameters and fault event data. Of particular advantage is the use of the DIGSI 4 op-erating program during com-missioning.
Safe bus architecture
RS485 bus
With this data transmission via copper conductors elec-tromagnetic fault influ-ences are largely elimi-nated by the use of twisted-pair conductor. Upon failure of a unit, the remaining system contin-ues to operate without any faults.
Fiber-optic double ring cir-cuit
The fiber-optic double ring circuit is immune to electro-magnetic interference. Upon failure of a section between two units, the communication system continues to operate with-out disturbance.
It is generally impossible to communicate with a unit that has failed. If a unit were to fail, there is no ef-fect on the communication wit h the rest of the system.
Retrofitting: Modules for every type of communica-tion
Communication modules are available for the entire SIPROTEC 4 unit range. This ensures that a range of communication protocols can be used (DNP 3.0, Modbus RTU, UCA, IEC 60870-5-103, Profibus, DIGSI). No external converter is required.
IEC 60870-5-103
IEC 60870-5-103 is an inter-nationally standardized proto-col for the efficient solving of communication problems in the protected area.
IEC 60870-5-103 is sup-ported by a number of pro-tection device manufacturers and is used w orld-wide.
Profibus-FMS
Profibus-FMS is an interna-tionally standardized commu-nication system (EN 50170) for comm unication problem solving. Profibus is supported internationally by several hundred manufacturers and has to date (status as at mid 1997) been used in more than 1,000,000 applications all over the w orld.
Connection to a SIMATIC S5/S7 programmable controller is made on the basis of the data obtained (e.g. fault re-cording, fault data, measured values and control functional-ity) via SICAM energy auto-mation system or via Profibus DP.
Profibus DP
Profibus DP is an industry recognized standard for commm unications and is supported by a number of PLC and protection device manufacturers.
Modbus RTU
Modbus RTU is an industry recognized standard for com-munications and is supported by a number of PLC and protection device
Fig. 16
Communication mod-ule for retrofitting
Fig. 17 IEC60870-5-103 star-type RS232 copper conductor connection or fibre-optic connection
Fig. 18 Profibus: Optical double ring circuit
1) OpticalLinkModule
OLM1) Communication L S P 2 0 5 1 a . e p s
SIPROTEC 4 7SJ61/62/63 / 6MD63
M ultifunction Protection Relay and Bay Controller
DNP 3.0
DNP 3.0 (Distributed
Netw ork Protocol version 3) is a messaging based com-munications protocol. The SIPROTEC 4 unit s are fully Level 1 and Level 2 compli-ant with DNP 3.0. DNP 3.0 is supported by a number of protection device manufac-turers.
UCA
UCA (Utility
Communications Architec-ture) is a developing commu-nications protocol specifically designed for substation auto-mation. When it becomes an international standard, the SIPROTEC 4 units are pre-pared to support it . Simply plug in a new communication module. n n n n n
Fig. 19
NXAir panel (air-insulated)
Switchgear cubicles for high/ medium voltage
All units are designed specifically to meet the requirements of high/medium-voltage applica-tions.
In general, no separate measur-ing instruments (e.g. for current, voltage, frequency, measuring transducer...) or additional con-trol components are necessary.
L S P 2 0 7 7 f . e p s L S P 2 1 1 2 u s a . t i f L S P 2 1 1 3 u s a . t i f L S P 2 0 6 6 u s a . t i f L S P 2 0 6 7 u s a . t i f Fig. 21 Display examples 7SJ62
Operational measured values
Fault display
Fig. 20
NXPlus panel (gas-insulated)
M easured values
The RMS values are calculated from the acquired current and voltage along with the pow er factor, frequency, active and reactive power. The follow ing functions are available for measured value proc-essing:
CurrentsI A,I B,I C,I N,I EE(67Ns)
VoltagesV A,V B,V C,V AB,V BC,V CA
Symmetrical components I 1,I 2,
3 I 0;V 1,V 2, 3V 0
Power Watts, Vars, VA / P ,Q ,S
Power factor (cosϕ) Frequency
Energy ± kWh, ± kVarh, forw ard and reverse power flow
Mean as well as minimum and maxi-mum current and voltage values Operating hours counter
Mean operating temperature of over-load function
Limit value monitoring
Limit values are monitored using pro-grammable logic in the CFC. Com-mands can be derived from t his limit value indication.
Zero suppression
In a certain range of very low m eas-ured values, the value is set to zero to suppress interference.
Metered values
For internal metering, the unit can calculate an energy metered value from the measured current and voltage values. If an external meter with a metering pulse out-put is available, the SIPROTEC 4 unit can obtain and process me-tering pulses via an indication in-put.
The metered values can be dis-played and passed on to a con-trol center as an accumulation with reset. A distinction is made betw een forw ard, reverse, active and reactive energy.
Measuring transducers
Characteristic with knee For measuring transducers it sometimes makes sense to ex-tend a small range of the input value, e.g. for the frequency that is only relevant in the range 45 to 55, 55 to 65 Hz. This can be achieved by using a knee characteristic.
Live-zero monitoring
4 - 20 mA circuits are moni-tored for open-circuit detection. L S P 2 0 7 8 f . e p s n n n n n n n n n n n n n n
Functions
Control and automatic functions
Control
In addition to the protection funct ions, t he SIPRORTEC 4 units also support all control and monitoring functions t hat are required for operating medium-voltage or high-voltage substations.
The main application is reli-able control of swit ching and other processes.
The status of primary equip-ment or auxiliary devices can be obtained from auxiliary contacts and communicated to the 7SJ62/63 via binary in-puts. Therefore it is possible to detect and indicate both the OPEN and CLOSED posi-tion or a fault or intermediate circuit-breaker or auxiliary contact position.
The switchgear or circuit-breaker can be controlled via: − integrated operator panel − binary inputs
− substation control and pro-tection system
− DIGSI 4
Automation
With integrated logic, the user can set, via a graphic in-terface (CFC), specific func-tions for the automation of swit chgear or substation. Functions are activated via function keys, binary input or via communication interf ace.
Swit ching authority
Switching authority is deter-mined according to parame-ters, communication or by key-operated sw itch (when available).
If a source is set to
“ LOCAL” , only local switch-ing operations are possible. The following sequence of swit ching authority is laid dow n: “ LOCAL” ; DIGSI PC program, “ REM OTE” Every sw itching operation and change of breaker posi-tion is kept in the status indi-cation memory. The swit ch command source, swit ching device, cause (i.e. spontane-ous change or command) and result of a switching op-eration are retained.
Key-operated switch
7SJ63/6MD63 units are fitt ed with key-operated switch function for local/remote changeover and changeover between interlocked switch-ing and test operation.
Command processing
All the functionality of com-mand processing is of fered. This includes the processing of single and double com-mands wit h or wit hout feed-back, sophisticated m onitor-ing of t he control hardware and softw are, checking of the external process, control actions using functions such as runtime monitoring and automatic command term ina-tion after out put. Here are some typical applications:
Single and double com-mands using 1, 1 plus 1 common or 2 trip contacts Usdefinable bay int er-locks
Operating sequences com-bining several switching operations such as control of circuit-breakers, discon-nectors and earthing swit-ches
Triggering of switching op-erations, indications or alarm by combination with existing information Fig. 22 L S P 2 0 8 4 f . t i f Assignment of feedback to command
The positions of t he circuit-breaker or sw itching devices and transformer taps are ac-quired by feedback. These in-dication inputs are logically assigned to the correspond-ing command output s. The unit can therefore distinguish whether the indication change is a consequence of swit ching operation or whether it is a spontaneous change of state (intermediate position).
Chatter disable
Chatter disable feature evalu-ates whet her, in a configured period of time, the number of status changes of indication input exceeds a specified fig-ure. If exceeded, the indica-tion input is blocked for a cer-tain period, so that the event list w ill not record excessive operations.
Filter time
All binary indications can be subjected to a filter time (indication suppression)
Indication filtering and de-lay
Indications can be filtered or delayed.
Filtering serves to suppress brief changes in potential at the indication input. The indication is passed on only if the indication voltage is still present after a set period of time. In the event of indica-tion delay, there is a wait for a preset time. The informa-tion is passed on only if the indication voltage is still pres-ent after this time.
Indication derivation
A further indication (or a command) can be derived from an existing indication. Group indications can also be formed. The volume of infor-mation to the system inter-face can thus be reduced and restricted to the most impor-tant signals.
Transmission lockout
A data transmission lockout can be activated, so as to prevent transfer of
information to the control center during w ork on a cir-cuit bay.
Test operation
During commissioning, all indications can be passed to a automatic control system for test purposes.
SIPROTEC 4 7SJ61/62/63 / 6MD63
M ultifunction Protection Relay and Bay Controller
n
n
n
n
Motor control
For direct activation of the circuit-breaker, disconnector and grounding switch operat-ing mechanisms in auto-mated substations, the SIPROTEC 4 units 7SJ63/6MD63 with high-performance relays are avail-able.
Interlocking of t he individual swit ching devices takes place with the aid of pro-grammable logic. Additional auxiliary relays can be elimi-nated. This results in less w iring and engineering effort.
Fig. 23
Typical wiring for 7SJ632 motor direct control (Simplified representation wit hout fuses)
Fig. 24 Example: Single busbar with circuit-breaker and
motor-controlled three-position switch Fig. 25 Example: Circuit-breaker interlocking
Fig. 26 Example: Disconnector interlocking Fig. 27 Example: Grounding sw itch interlocking
Binary output BO4 and BO5 are int erlocked so that only one set of contacts are closed at a time.
Functions
SIPROTEC 4 7SJ61/62/63 / 6MD63
M ultifunction Protection Relay and Bay Controller
Protection functions Time-overcurrent protec-tion (ANSI 50, 50N, 51, 51N)
This function is based on the phase-selective measure-ment of the three phase cur-rents and the ground current (four transformers). Two definite-time overcurrent pro-tection elements (DMT) exist both for the phases and for the ground. The current threshold and the delay time can be set in a wide range. As an option, inverse-time overcurrent protection characterist ics (IDMTL) can be activated: Fig. 28 Definite-time overcurrent protection Fig. 32 Definite inverse Fig. 31 Long inverse t = − + ⋅ 5 6143 1 218592 . . M TD t = − + 0 4797 ⋅ 1 0 21359 1 5625 . . . M TD Fig. 30 Short inverse t = − + 0 2663 ⋅ 1 0 03393 1 2969 . . . M TD
Inverse-time overcurrent char-acteristics to ANSI/ IEEE • Inverse • Short inverse • Long inverse • Moderately inverse • Very inverse • Extremely inverse • Definite inverse Notes on Fig. 29 to 32: Scope of M from 1.1 to 20 Fig. 29 Inverse t = − + ⋅ 8 9341 1 0 17966 2 0938 . . . M TD n
Fig. 33 Reset Moderately inverse Fig. 36 Very inverse Fig. 35 Reset Very inverse Fig. 34 Moderately inverse t = − + 3 922 ⋅ 1 0 0982 . . M 2 TD
Tripping time characteristics of the definite-time overcurrent protection according to ANSI (IEEE) C37.112
t = tripping time in seconds
M = multiples of pickup setting
range 0.1 to 4
TD = time dial
Reset characteristics
For easier time coordination with electromechanical re-lays, reset characteristics ac-cording to ANSI standard C37.112 are applied. The determination of t he time sequence is carried out by integration of tim e con-stants according to the char-acteristics for all currents above the reset threshold. See Fig. 33, 35, 37 t = − + ⋅ 0 0103 1 0 0228 . . M 0.02 TD t reset = 2 ⋅ − 4 32 1 . TD M t reset = 2 ⋅ − 0 97 1 . TD M
SIPROTEC 4 7SJ61/62/63 6MD63
M ultifunction Protection Relay and Bay Controller
Functions
Tripping time characteristics of the definite-time overcurrent protection according t o ANSI (IEEE)
t = tripping time in seconds
M = multiples of pickup setting
range 0.1 to 4 TD = time dial Fig. 37 Reset Extremely inverse Fig. 38 Extremely inverse t = − + 5 64 ⋅ 1 0 0243 2 . . M TD t reset = 2⋅ − 5 82 1 . TD M
Fig. 39 Inverse Fig. 42 Long inverse Fig. 41 Extremely inverse Fig. 40 Very inverse
( )
t = T − ⋅ 120 1 I I p pInverse time - overcurrent characteristics according t o IEC standard
( )
t = T − ⋅ 135 1 , I I p p( )
t = T − ⋅ 80 1 I I p 2 p( )
t = T − ⋅ 0 14 1 00 02 , , I I p pFig. 43
Setting sheet for user-definable characteristic
L S P 2 1 3 1 f . t i f User-definable characteristics
Instead of the predefined time curve characteristics ac-cording to ANSI, tripping characteristics can be de-fined by the user for phase and ground units separately. Up to 20 current/tim e value pairs may be programmed. They are set as pairs of num-bers or graphically in DIGSI 4.
Inrush restraint
If the second harmonic is de-tected w hen energizing a transformer triggering for the 50-1 element, 51 element , 67-1 element and 67TOC ele-ment is blocked.
Dynamic sett ing for cold-load starts
For directional and non-directional time-overcurrent protection functions the initiation thresholds and trip-ping times can be switched via binary inputs or by t ime control. See page 25.
SIPROTEC 4 7SJ61/62/63 6MD63
M ultifunction Protection Relay and Bay Controller
Functions
Fig. 44
P ´>0
Sensitive directional ground-fault detection (ANSI 64, 67Ns)
For isolated-neutral and com-pensated netw orks, the di-rection of power flow in the zero sequence is calculated from the zero-sequence cur-rent I 0and zero-sequence
voltageV 0. For netw orks
w ith an isolated neutral, the reactive current component is evaluated; for compen-sated networks the active current component or resid-ual resistive current is evalu-ated. For special network conditions, e.g. high-resistance grounded net-works with ohmic-capacitive ground fault current or low -resistance grounded net-works with ohmic-inductive current, the tripping
characteristics can be rotated approximately ±45 degrees (see Fig. 45).
Two modes of ground fault direction detection can be implemented: tripping or in “ signaling only mode” . It has the following functions:
TRIP via the displacement voltageV 0
Two instantaneous elements or one instantaneous plus one user-defined characteris-tic. Each element can be set in the f orward, reverse, or non-directional.
Directional tim e-overcurrent protection (ANSI 67, 67N)
Phase and ground
directionality is performed independently in the
7SJ62/7SJ63. The phase and ground function parallel the non-directional overcurrent element. Their response value and delay times can be set separately. As an option, inverse directional time-overcurrent protection char-acteristics (IDMTL) can be connected. The tripping char-acteristic can be rotated about ±45 degrees.
The directional overcurrent-time protection maintains a voltage memory of 2 cycles prior to the fault. By means of voltage memory,
directionality can be
determined reliably even for close in (local) faults. If the swit ching device closes onto a fault and the voltage is too low to determine direction, directionality (directional de-cision) is made w ith voltage from voltage memory. If no voltage exists in m emory, tripping occurs according to the coordination schedule.
Sensitive ground-fault de-tection (ANSI 50N, 51N)
For high-resistance grounded netw orks, a sensitive input transformer is connected to a phase-balance neutral current transformer.
The ground-fault current is also calculated from the phase currents so that the ground fault protection operates correctly in t he event of current t ransformer saturation.
Fig. 45
Directional characteristic of t he directional time-overcurrent protection
Inductive Reverse Forward Capacitive Fig. 46 Directional determination using cosine measurements for compensated networks
V ars 67Ns Watts V E P ´<0 P ´>0 67Ns directional
power factor cosϕ
correction = +15°
Reverse Forward
Directional comparison protection (cross-coupling)
It is used for selective protection of sections fed from two sources with instantaneous tripping, i.e. without the disadvantage of time coordination. The directional comparison protection is suitable if the distances between the protection stations are not significant and pilot wires are available for signal
transmission. In addition to the directional comparison protection, the directional coordinated time-overcurrent protection is used for
complete selective back-up protection. If operated in a closed-circuit connection, an interruption of the
transmission line is detected.
Fig. 47
Directional comparison protection
Breaker failure protection (ANSI 50BF)
If a faulted portion of the electrical circuit is not discon-nected upon issuance of a trip comm and, another com-mand can be initiated using the breaker failure protection w hich operates the circuit-breaker, say, of an upstream (higher-level) protection re-lay. Breaker failure is de-tected if aft er a trip com-mand, current is still flow ing in the f aulted circuit. As an option it is possible to make use of the circuit-breaker po-sition indication.
Phase balance current
pro-tection(Negative sequence
protection)(ANSI 46)
In line protection, the two-element phase balance cur-rent/negative sequence pro-tection permits depro-tection on the high side high-resistance phase-to-phase faults and phase-to-ground faults that are on the low side of a transformer (e.g., with the switch group Dy 5). This pro-vides back-up protection for high-resistance faults beyond the t ransformer. To detect the unbalanced load, the ratio negative-sequence current / nominal current is evaluated.
Auto-reclose (ANSI 79)
M ultiple recloses can be de-fined by the user and lockout will occur if a fault is present after the last reclose. The fol-lowing functions are possi-ble:
3-phase ARC for all types of fault
Separate settings for phase and ground faults
Multiple ARC, one rapid auto-reclose (RAR) and up to nine delayed auto-recloses (DAR) Starting of the ARC depends on the trip com-mand selection (e.g. 46, 50, 51, 67).
Blocking option of the ARC via binary inputs
ARC can be initiated externally
Blocking of the directional and non-directional high-set elements.
SIPROTEC 4 7SJ61/62/63 6MD63
M ultifunction Protection Relay and Bay Controller
Functions n n n n n n n
Parameters Set value Time constant τ /min Parameters Set value Time constant τ /min
Thermal overload protec-tion (ANSI 49)
For protecting cables and transformers, an overload protection with an integrated prewarning element for temperature and current can be applied. The temperature is calculated using a thermal homogeneous-body model (according t o IEC 60255-8), w hich takes account both of the energy entering the equipment and the energy losses. The calculated tem-perature is constantly ad- justed accordingly. This takes
account of the previous load and the load fluct uations. For thermal protection of m o-tors (especially the stator) a further time constantτcan be set so that the thermal ratios can be detected correctly while the motor is rotating and when it is stopped. The model automatically functions correctly, if the equipment is operated within the limits of the ambient temperature for w hich the maximum load cur-rent is rated by the manufac-turer. If the ambient tem pera-ture fluctuates (e.g. sum-mer/w inter), correction is pos-sible via a second parameter set.
The tripping timet is
calculated for a current step w ith static current values acc. to the following form:
Overload protection w ithout preload detection t = ⋅ ⋅ ⋅ − τ ln I I I I k k N N 2 2 1
Overload protection with preload detection t = ⋅ ⋅ − ⋅ ⋅ − τ ln k k k N 2 pre N N 2 2 I I I I I I 1
t = t ripping time after beginning of the overload
τ = thermal time constant
I pre = previous load current
I =overload current
k = k factor (acc. to IEC60 255-8)
ln = natural logarithm
I nom= rated current
Fig. 48
Tripping characteristics wit h preload detection
Fig. 51
Characteristic of starting time monitoring
I A = Start-up current
of motor
t Amax = max. starting time
of motor with
start-up currentI A
I pickup = pickup setting
of function
t
t Amax
I pickup I A I
Fig. 49
Fig. 50
Temperature characteristic at rot or and in thermal replica of the rotor (multiple start-ups)
1. Start-up 2. Start-up 3. Start-up
Motor
started Motorstarted Motorstarted
T Recovery time T Recovery time T Recovery time L S P 2 0 8 7 f . e p s M otor protection
Starting t ime supervision (ANSI 48)
Starting time supervision protects the motor against long unwanted start-ups, that might occur when excessive load torque occurs, excessive voltage drops occur within the motor or if the rotor is locked. Fig. 49 shows temperature varia-tion in a simplified w ay. Rotor tem pera-ture is calculated f rom m easured stator current. The tripping tim e is calculated according to the f ollowing equation:
t TRIP = I I start rms 2 start max ⋅t
for I rms>I start, reset ratio I I
nom start
approx. 0.94
t TRIP = t ripping time I start = start-up current of
the motor
T startmax = maximum
permis-sible starting time
I rms = actual current
flowing
If the trip tim e is rated according to the above formula, even a prolonged startup and reduced voltage (and reduced startup current) will be evaluated cor-rectly.
A binary signal is set by a speed sensor to det ect a blocked rotor. An instanta-neous tripping is effect ed. The tripping time is inverse (current dependent).
Phase balance current prot ection (ANSI 46)
The negative sequence / phase balance current protection det ects a phase failure or load unbalance due to network asymmet ry and protects the rotor f rom impermissible t emperature rise. To detect the unbalanced load, the ratio of negative-sequence current to rated current is evaluated.
Start inhibit (ANSI 66/ 86)
If a motor is started up too m any times in succession, the rotor can be subject to thermal overload, especially the up-per edges of the bars. The rotor temup-per- temper-ature is calculated from the stator cur-rent and the temperature characteristic is shown in a schematic diagram. The reclosing lockout only permit s startup of the motor if the rotor has sufficient t her-mal reserves for a complete startup, see Fig. 50.
Emergency startup
This function disables the reclosing lock-out via a binary input by st oring the state of the thermal image until the binary in-put is active. It is also possible to reset the t hermal replica to zero.
Maximum permissible rotor temperature
Temperature characteristic of rotor rod top edge
rotor rod bottom edge
Thermal replica
SIPROTEC 4 7SJ61/62/63 6MD63
M ultifunction Protection Relay and Bay Controller
Functions
Fig. 52 L S P 2 0 8 5 a . t i f 1) The 45 to 55, 55 to 65 Hz range is available forf N= 50/60 Hz M otor protection (continued) Undercurrent monitoring (ANSI 37)
With this function, a sudden drop in current is detected that can occur due to a re-duced motor load. This can cause shaft breakage, no-load operation of pumps or fan failure.
Voltage protection Overvoltage protection (ANSI 59)
The overvoltage protection detects unwanted network and machine overvoltage conditions.
Undervoltage protection (ANSI 27)
The two-element undervolt-age protection provides pro-tection against dangerous voltage drops (especially for electric machines). Applica-tions include the isolation of generators or mot ors from the netw ork to avoid unde-sired operating states and a possible loss of stability. Proper operating conditions of electrical machines are best evaluated w ith the posi-tive sequence quantities. The protection function is active over a wide frequency range (45 to 55, 55 to 65 Hz). The undervoltage protection is supervised by a binary input using the CB position to block protection trips prior to placing equipment on-line.
Frequency protection (ANSI 81O/U )
Frequency protection can be used for overfrequency and underfrequency protection. Electric machines and parts of the system are protected from unwanted speed devia-tions. Unwanted frequency changes in the netw ork can be detected and the load can be removed at a specified frequency sett ing. Frequency protection can be used over a wide frequency range (45 to 55, 55 to 65 Hz). Four ele-ments (selectable as overfre-quency or underfreoverfre-quency) and each element can be de-layed separately. Blocking of the f requency protection can be performed if using a bi-nary input or by using an undervoltage element.
Customized functions ANSI 32, 51V, 55, etc.
Additional functions, which are not time critical, can be implemented via the CFC us-ing measured values. Typical functions include reserve power, voltage controlled overcurrent, phase angle de-tection, and zero sequence voltage detection.
Fault locator
The fault locator specifies the distance to a fault location in kilometers or miles or the reactance of a second fault operation.
Inrush restraint
The relay features second harmonic restraint. If the sec-ond harmonic is detected during transformer
energization, triggering of trip non-directional and direc-tional elements are blocked.
Commissioning
Commissioning could hardly be easier and is fully sup-ported by DIGSI 4. The sta-tus of the binary inputs can be read individually and the state of t he binary outputs can be set individually. The operation of sw itching ele-ments (CBs, disconnect de-vices) can be checked using the switching functions of the bay controller. The analog measured values are repre-sented as wide-ranging oper-ational measured values. To prevent transmission of information to the control center during maintenance, the bay controller communi-cations can be disabled to prevent unnecessary data from being transmitted. During commissioning, all in-dications with test marking for test purposes can be con-nected to a control and pro-tection system.
Regionalization
The SIPROTEC 4 units 7SJ61/62 can be supplied in regional versions. The user purchases only the functions required. The available func-tions are matched to the technical requirements of t he regions. See table at right.
Function Region DE
Germany Region WorldWorld Region USUSA Region FR, SPFrance, Spain Frequency 50 Hz 50 Hz/60 Hz
Preset to 50 Hz 60 Hz 50 Hz/60 HzPreset to 50 Hz Distance indication
Fault locator km km/milesPreset to km miles km/milesPreset to km Disc-emulationwith
inverse characteristics – Only for ANSIcharacteristics and user-defineable characteristics
X Only for ANSI characteristics and user-defineable characteristics Inverse characteristics IEC characteristics X X Preset to IEC characteristics – X Preset to IECcharacteristics ANSI characteristics – X X X Auto-reclose X – – – Auto-reclose
with zone sequencing – X X X
Control buttons red/green red/green grey/grey red/green
n
Connection techniques and rack mounting case wit h many advantages
1/3, 1/2 and 1/1-rack sizes: These are the available case widths of the SIPROTEC 4 unit series, referred to as 19" module frame system. This means that the units of previ-ous models can always be re-placed. The space required in the sw itchgear cubicle is the same. The height is a uni-form 6 rack units (99 / 16"
243 mm) for all case widths. (Units in the 1/1 cases can only be supplied with de-tached operator panel). All w ires can be connected directly or via ring lugs. Plug-in terminals are avail-able as an option. Accessories 1) AMP Deutschland GmbH Amperestr. 7-11 D-63225 Langen Tel.:xx49 6103 709-0 Fax: xx49 6103 709-223 Fig. 56 2-pin connector Fig. 57 3-pin connector Fig. 58 Short-circuit link for current contacts
Fig. 59
Short-circuit link for voltage contacts
Fig. 55
Mounting rail for 19” rack
Fig. 54
7SJ62 Rear view with screw terminals
Fig. 53
7SJ63 with detached operator panel and plug-in terminals
For your local Siemens representa-tive please consult the address list at the end of this Catalog. The local representative can inform you on local suppliers. L S P 2 0 8 8 f . e p s L S P 2 0 9 9 f . e p s
Description Order No. Size of
package Supplier Fig. Terminal safety cover
Voltage terminal 18-pole; Current terminal 12-pole
C73334-A1-C31-1 1 Siemens Voltage terminal 12-pole;
Current terminal 8-pole C73334-A1-C32-1 1 Siemens Connector 2-pin
Connector 3-pin C73334-A1-C35-1C73334-A1-C36-1 11 SiemensSiemens 5556 Crimp connector CI2 0.5-1 mm2 Crimp connector CI2 0.5-1 mm2 Crimp connector CI2 1-2.5 mm2 Crimp connector CI2 1-2.5 mm2 Crimp connector Type III+ 0.75-1.5 mm2 Crimp connector Type III+ 0.75-1.5 mm2 827039-1 827396-1 827040-1 827397-1 163084-2 163083-7 4000 tapedon reel 1 4000 tapedon reel 1 1 4000 tapedon reel AMP1) AMP1) AMP1) AMP1) AMP1) AMP1) Crimping tool for Type III+
Crimping tool for CI2 0-169422-10-825582-0 11 AMP 1) AMP1) 19” mounting rail C73165-A63-D200-1 1 Siemens 55 Short-circuiting links
current terminals
Line feeder w ith load shedding
In unstable netw orks (e.g. sol-itary networks, emergency power supply in hospitals), it may be necessary to isolate selected loads from t he net-work to prevent overload of the overall netw ork. The overcurrent time protection functions are effective only in the case of a short circuit. Overloading of the generator can be measured as a fre-quency or voltage drop.
Fig. 61
Dynamic setting (activated via binary input)
Fig. 60
Line feeder w ith load shedding
Typical applications
Dynamic setting for cold-load starts
The initiation thresholds and the tripping tim es can be changed for directional and non-directional time overcur-rent protection functions via binary input or time control. Example: Cold load pickup af-ter a ten-minute power failure.
After long outage periods, there is an increased demand for energy for a limit ed period due to cooling or heating sys-tems. The less sensitive set-tings are activated wit h the aid of a timer (CB OPEN time). When a second timer (ACTIVE time) finishes its run, the original settings are reactivated.
A third tim er (STOP time) su-pervises the process, starting as soon as the current level falls below the original set-ting. If t he current stays be-low that level while the se-cond timer is running, the original setting is reactivated after the third timer finishes ist run. This gives more reli-ability on protection, since the original settings are reac-tivated faster.
Fig. 62
Switch onto short-circuit
Fig. 63 Auto-reclose (ARC) 1) Auto reclose. Protection on connecting to a short-circuit If connection is switched onto a f ault, instantaneous tripping can be effected. If the internal control function is used (local, via binary input or via serial interface), the manual closing function is available without any addi-tional wiring. If the feeder is connected via an external circuit-breaker bypassing the internal control function, manual detection using a bi-nary input is implemented.
Auto-reclose
The auto-reclose features provide starting and blocking functions as described on page 20. Figure 63 gives an example w here the blocking of the reclosing function is applied. Time current coordi-nation is implemented with the tim e-overcurrent sett ings of t he bay controller. If a fault occurs, the f eeder is tripped with an instantaneous ele-ment and automatically reclosed. With the circuit-breaker operating instanta-neously, no other protection devices will operate (fuse saving scheme). If the fault still exists after t he breaker is automatically reclosed, addi-tional reclosing attempts can be made. (A high-set instan-taneous element of the up-stream breaker can be set so it w ill not operate for a fault beyond the downstream pro-tection device.) Low-set in-stantaneous elements of t he upstream breaker will be blocked during subsequent faults on the feeder; how-ever, the downstream breaker can be set to provide an additional instantaneous trip or be time-delayed to al-low downstream fuses to op-erate. If suff icient time delay is provided, a downst ream fuse can operate and no fur-ther breaker operations are required. Time coordination of the breakers will limit the outage to a smaller portion of the feeder if the fault is downstream of the second breaker. If additional reclosing equipment is in-stalled on the same feeder,
Typical applications
SIPROTEC 4 7SJ61/62/63 6MD63
Transformer protection
The high-set element permits current coordination w here the overcurrent element f unctions as a back-up for the lower-level protection relays, and the over-load function protects the t rans-former f rom thermal overload. Low-current single-phase faults on the low voltage side that map into the negative-sequence sys-tem on the high-voltage side can be detected with the negative sequence protection. The avail-able inrush restraint prevents tripping due to inrush currents of the transformer.
Fig. 65
Typical protection of a transformer
Fig. 64
Bus protection (reverse interlocking)
reclosing schemes can be altered to limit protec-tion to smaller porprotec-tions of the feeder (zone se-quencing). Relay settings are assigned and allow the furthest downstream breaker to operate first. This makes it possible to reduce the number of reclosing attempts on the feeder.
Busbar protection (reverse interlocking)
By using binary inputs (closed-circuit or
open-circuit current) it is possible to block the high current tripping of individ-ual protection relays. In this w ay, it is possible to implement a simple bus protection (reverse inter-lock scheme).
Fig. 67
Typical protect ion of medium-voltage ring
Line protection
Simple network systems within high voltage and medium-voltage overhead systems can be protected as shown in Fig. 66.
At the in-feed points it is possible to per-form auto-reclose. The remaining units are equipped w ith directional short-circuit protection.
Fig. 66
Typical protection of a high-voltage asynchronous mot or
Motor protection
For short-circuit protection, e.g. elements 50 and 50N are avail-able. The stator is protected against thermal overload by 49 (υs), the rotor by 46 ( I 2>),
start-ing time supervision (48) and start inhibit (66/68). Via a binary input, it is possible to detect a locked rotor and isolate im me-diately. The reclosing lockout can be deactivated for “ emer-gency startup” .
The undervoltage function prevents startup on insufficient voltage and the overvoltage function prevents insulation damage.
Typical applications
SIPROTEC 4 7SJ61/62/63 6MD63
Fig. 70
Residual circuit wit h directional element Connection of current
and voltage transformers Standard connection
For grounded networks, the ground current is obtained from the phase currents by the residual current circuit. If the condition 0.1I nom < I gnd
< 1.5 A sec is fulfilled, it is possible to use the residual current circuit for directional ground fault detection in iso-lated netw orks. In this case the sensitive transformer must also be looped into the ground current circuit. If t he ground current does not fulf ill the above condition, a phase balance neutral current trans-former is required, con-nected as shown in Fig. 69.
Fig. 68 Residual circuit without directional element Fig. 69 Sensitive ground current detection without directional element n
Fig. 71
Sensitive directional ground fault detection with directional ele-ment f or phases Fig. 73 Isolated-neutral or compensated net-works Fig. 72 Sensitive directional ground fault detection
Connection for compen-sated networks
The figure shows the con-nection of tw o phase-to-ground voltages and theV E
voltage of the open delta winding and a phase-balance neutral current transformer for t he ground current. This connection maintains maxi-mum precision for directional ground fault detection and must be used in compen-sated networks.
Fig. 72 shows sensitive directional ground detect ion only.
Connection for isolated-neutral or compensated netw orks only
If directional ground fault pro-tection is not used, the con-nection can be made wit h only tw o phase current t rans-formers. Directional phase short-circuit protection can be achieved by using only two primary transformers.
Typical applications
SIPROTEC 4 7SJ61/62/63 6MD63
Overview of connection types · Typical application
Fig. 74
Undervoltage release with make contact 50, 51 Connection of
circuit-breaker
Undervoltage releases
Undervoltage releases are used for automatic tripping of high-voltage motors.
Example: DC supply voltage of control system fails and manual electric tripping is no longer possible.
Automatic tripping takes place when voltage across the coil drops below the trip limit. In Fig. 74, tripping occurs due to failure of DC supply voltage, by automatic opening of the live status contact upon failure of pro-tection unit or by short-circuiting the t rip coil in event of netw ork fault.
Type of network Function Current connection Voltage connection
(Low-resistance) grounded Time-overcurrent protection Residual circuit, with 3 phase – network phase/ground non-directional current transformers required,
phase balance neutral current transformer possible
(Low-resistance)grounded Sensitive ground fault Phase balance neutral current –
networks protection transformers required
Isolated or compensated Time-overcurrent protection Residual circuit, with 3 or 2 – net works phases non-direct ional phase current t ransf ormers
possible
(Low-resistance) grounded Time-overcurrent protection Residual circuit, with 3 phase Phase-to-ground connection net works phases direct ional current t ransf orm ers possible or phase-t o-phase connect ion Isolated or compensated Overcurrent-time protection Residual circuit, with 3 or 2 Phase-to-ground connection net works phases direct ional phase balance neut ral current or phase-t o-phase connect ion transformers possible
(Low-resistance) grounded Overcurrent-time protection Residual circuit, with 3 phase Phase-to-ground connection netw orks ground directional current transformers required required
phase balance neutral current transformers possible
Isolated networks Sensitive ground-fault Residual circuit, if 0.1I N 3 times phase-to-ground
protection sinϕmeasurement ground current < 1.5 A on connection or
phase-to-secondary side, otherwise ground connection with open phase balance neutral current delta winding
transformers required
Compensated networks Ground-fault protection Phase balance neutral current Phase-to-ground connection cosϕm easurem ent t ransf orm ers required w it h open delt a w inding
required
Fig. 76
Trip circuit supervision with 2 binary inputs
In Fig. 75, tripping is by fail-ure of auxiliary voltage and by interruption of t ripping cir-cuit in event of network fail-ure. Upon failure of protec-tion unit, t ripping circuit is also interrupted, since con-tact held by internal logic drops back into open posi-tion.
Motor control (see page 13).
Trip circuit supervision (ANSI 74TC)
One or tw o binary inputs can be used for monitoring the circuit-breaker trip coil includ-ing its incominclud-ing cables. An alarm signal occurs when-ever the circuit is interrupted.
Lockout (ANSI 86)
All binary outputs can be stored like LEDs and reset using the LED reset key. The lockout state is also stored in the event of supply voltage failure. Reclosure can only occur after the lockout state is reset.
Fig. 75
Undervoltage trip wit h locking contact (trip signal 50 is inverted)
Protection indications 511* General trip 2851* CB close command 6852* Trip circuit
supervi-sion: Trip relay 5853* Trip circuit
supervi-sion: CB aux 52a open, when CB is open 52b open, w hen CB is closed BI Binary input TRIP contact Breaker Bl 1 Bl 2 open closed H L open open H H closed closed L L closed open L H Fig. 77
Trip circuit monitoring w ith 1 binary input
Typical application
SIPROTEC 4 7SJ61/62/63 6MD63
M ultifunction Protection Relay and Bay Controller
Protection indications 511* General trip 2851* CB close command 6852* Trip circuit
supervi-sion: Trip relay 52a open, when CB is open 52b open, when CB is closed
TRIP contact Breaker Bl 1 open closed H open open H closed closed L closed open L
* Function number inside the relay.
Technical dat a
IEC60255
ANSIC37.90, C37.90.1, C37.90.2, UL508
Insulation tests Standards IEC 60255-5; ANSI/IEEE C37.90.0
Voltage test (100% test)
all circuits except for auxiliary voltage and RS485/RS232 and time synchronization Auxiliary voltage
Communication ports and time synchronization
2.5 kV(rms value), 50 Hz/60 Hz 3.5 kVDC
500 VAC Impulse voltage test (type test)
all circuits, except communication ports and time synchronization, class III
5 kV(peak value); 1.2/50 µs; 0.5 J
3 positive and 3 negative impulses at intervals of 5 s
(Type tests) Standards IEC 60255-6; IEC 60255-22 (product standard)
EN 50082-2 (generic specification) DIN 57435 Part 303
High-frequencytest IEC60255-22-1, class III
and DIN 57435 Part 303, Class III
2.5 kV(peak value); 1 MHz;τ= 15ms; 400 pulses per s; test duration 2 s Discharge of static electricity
IEC60255-22-2 class IV and EN 61000-4-2, class IV
8 kVcontact discharge; 15 kVair gap discharge; both polarities; 150 pF;R i= 330Ω
Radio-frequency electromagnetic field, unmodulated
IEC60255-22-3 (Report) class III 10V/m; 27to 500 MHz Radio-frequency electromagnetic field,
amplitude-modulated IEC61000-4-3; class III
10V/m, 80to 1000MHz; AM 80%; 1 kHz Radio-frequency electromagnetic field,
pulse-modulated
IEC61000-4-3/ENV 50204; class III
10 V/m, 900 MHz; repetition rate 200 Hz, on duration 50 %
Fast transient interference/burst
IEC60255-22-4 andIEC61000-4-4, class IV 4 kV; 5/50 ns; 5 kHz; burst length = 15 ms;repetition rate 300 ms; both polarities; R i= 50Ω; test duration 1 min
Surge IEC61000-4-5; class III Auxiliary voltage
Binary inputs/outputs
from circuit to circuit: 2 kV; 12Ω; 9µF across contacts: 1 kV; 2Ω; 18µF from circuit to circuit: 2 kV; 42Ω; 0.5µF across contacts: 1 kV; 42Ω; 0.5µF Conducted RF, amplitude-modulated
IEC61000-4-6, class III 10V;150 kHzto 80MHz; AM 80%; 1 kHz Power frequency magneticfield
IEC61000-4-8, class IV IEC60255-6
30 A/m; 50 Hz, continuous 300 A/m; 50 Hz, 3 s 0.5 mT, 50Hz Oscillatory surge withstandcapability
ANSI/IEEE C37.90.1 2.5 to 3 kV(peak value), 1 to 1.5 MHzdamped wave; 50 pulses per s; duration 2 s R i = 150 to 200Ω
Fast transient surge withstand capability
ANSI/IEEE C37.90.1 4 to 5 kV; 10/150ns; 50pulsesper sboth polarities; duration 2 s;R i= 80Ω Radiated electromagnetic interference
ANSI/IEEE C37.90.2 35 V/m
1); 25to 1000MHz; amplitude and pulse modulated Damped wave
IEC 60694 / IEC 61000-4-12 2.5 kV(peak value, polarity alternating)100 kHz, 1 MHz, 10 and50 MHz, R i= 200Ω
(Type tests) Standard EN 50081-* (generic specification)
Radio interferences on cables, only auxiliary voltage
IEC/CISPR 22 150 kHzto 30Mhzclass B
Radio interference field strength IEC/CISPR 11
Units with a detached operator panel must be installed in a metalcubicle to maintain class B
30to 1000 Mhz class B
Standards
EMC tests for interference immunity
EMC tests for interference emission
