Conventional Substation Automation
4.18.1 Function List
4.18.1.1 Basic Functions
User interface for local control system
S HV-apparatus control from the single line diagram S HV-apparatus position indication
Alarm system
S Process alarms S Logical alarms S System alarms CB operation counter Measured Values
S Electrical current, three-phase S Voltage, three-phase
Interlocking
S Bay interlocking S Apparatus interlocking
S Protection of disconnector and earthing switches against switching under load
S Intermediate position interlocking of the circuit breaker S Electric hand-crank interlocking
S Hand-crank hole interlocking (only ELK-04) S End-position interlocking
S Station wide interlocking
S Interlocking against coupling, sectionalizer and busbar earthing switch S Interlock override with key switch possible
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S HMI (human machine-interface) S Selfsupervisor
S Conventional functions
S Antipumping control of circuit breaker (CB)
S Blocking or autotrip of the circuit breaker at too low gas density level in the CB gas compartment
S Blocking or autotrip of the circuit breaker at too low drive force level S Control and supervision of the hydraulic pump
S Protection of the different control voltage circuits S Cubicle lighting
S Socket
S MCBs for protection of the low voltage circuits of voltage transformer
4.18.1.2 Options
The following optional functions can be added on request:
Measurements
S Indications from a protection system S Indications from a transformer
Interface stations system (e.g. MicroSCADA) / remote control system Optional Equipment
S Cubicle anti-condensation heating
S Operating mechanism anti-condensation heating S Transducers
S Coupling relays
S Auxiliary switch contact reproduction S Busbar replication
S Protection system S Trip circuit supervision S Synchrocheck
S Arc detection
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S Additional spare terminals (10% are included as standard) S Customer-specific terminal types
S Ferrules
S Special wirings / cablings
(coloured, halogen-free, heat-resistant)
4.18.2 Functional Description
1 Sensor for electronic key switch 2 Emergency of circuit breaker
(has to be pressed together with button 3 to trip the circuit breaker) 3 OFF button
4 Select button
5 ON button 6 Menu button 7 Enter button 8 Button to scroll up 9 Button to scroll down
4 5 6 7
3 8
1 2 9
Figure 4.18-1: REF542plus
The following list describes all the functions which are available and conventional wir-ing between control cubical and GIS.
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4.18.2.1 Basic Functions
User interface for local control
The local control is possible via a display which is connected to the control unit of the REF542plus via a serial interface. The display offers the following functions:
S Single line diagram in accordance with project-specific arrangement with dis-play of the current positions of the switchgear
S Control switchgear devices S Alarm acknowledgement
S OFF / LOCAL / REMOTE / LOCAL&REMOTE switchover (via electronic key switch)
S 3 displays for measurements values
S Individual alarms on LED with full text description
in accordance with project-specific alarm configuration (max. 32) HV apparatus control
The devices can be controlled locally at the display or via the station bus. Control is possible after checking the various interlocking conditions and the switching authority, with one switch impulse via binary output (BO). The circuit breaker will trip immedi-ately when a protection device gives the command to trip.
HV apparatus position indication
Double point indications are picked up by binary inputs (BI) from the auxiliary switch of the high-voltage devices and are displayed on the REF542plus display, and can also be transmitted via the station bus. In the case of intermediate position of the switching devices, an alarm is created and transmitted via the station bus.
Alarm system indication
Alarms are visible on the REF542plus display and transmission via the station bus is possible. The alarms can be acknowledged either manually in the REF542plus menu or automatically.
S Process alarms
(e.g. CB alarms, MCB trip, SF6 gas density from the GIS bay and messages from the protection system via BI)
S Logical alarms
(e.g. intermediate position) S System alarms
(e.g. computer malfunction)
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With the REF542plus it is possible to realise four operating statuses, corresponding to the position of the OFF / LOCAL / REMOTE / LOCAL&REMOTE switch:
S OFF
No switching actions are possible
S LOCAL
Switching actions are only possible from the local control system (REF542plus display)
S REMOTE
Switching actions are only possible from a superordinate device (e.g. Station control system).
S LOCAL&REMOTE
Switching actions possible from local and from a superordinate device.
This selection switch position can be transmitted via the station bus, including a time stamp.
Switching cycle count CB
All switch-off procedures of the circuit breaker are registered via BI, shown on the dis-play as a numerical value in the range 0 to 32767, and transmitted via the station bus.
Operation Measurement
Standard input sizes are 0 – 1 A and 0 – 100 V S Electrical current:
The appropriate values (three-phase measurement) are shown on the dis-play and can be transmitted via the station bus
S Voltage
The appropriate values (three-phase measurement) are shown on the dis-play and can be transmitted via the station bus
Interlocking
All interlockings in the REF542plus are realised by function blocks in the application software.
Interlock bypass
The complete interlocking with the exception of the end position and hand crank in-terlock can be bypassed using a key switch.
S Interlock override with key switch
The complete interlocking with the exception of the handcrank and the end position interlock is by-passed at this position. The mode can also be trans-mitted via the station bus, including a time stamp.
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S Device interlocking
Standard interlocking , low voltage side is included in the interlock.
S Interlocking against switching of the disconnector and earthing switches under load
The interlock prevents switching of the disconnector and earthing switches, as long as the appropriate circuit breaker is closed.
S Intermediate position interlock of the circuit breaker
The circuit breaker can only be switched on at a defined ON or OFF position of the disconnector
S Hand crank interlock
When the hand crank is inserted in, the corresponding switching device, all control is blocked. This message is transmitted via the station bus, including time stamp.
S End position interlocking
When a switching device is locked, the corresponding switching device con-trol is blocked.
Station wide locking
S Interlock against coupler, sectionalizer and bus bar earthing switch via trans-mission of the corresponding signals via the station bus.
Time synchronisation
All connected REF542plus can be synchronised via the station bus.
Self supervision
The REF542PLUS checks its hardware components and program execution automati-cally. The bus connections (if available) are also checked continuously.
Fuse protection for the electrical circuits
For reasons of selectivity, there are several electrical circuits in the bay cubicle:
AC:
S Cubicle heating and lighting DC:
S Circuit breaker control and protection trip circuit #1 S Protection trip circuit #2
S REF542plus
S Disconnector and earthing switch control S Disconnector and earthing switch motors S Motor-hydraulic pump
S Interlocking
S Position indications S Indications / Alarms
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A bulb is switched on via a door contact switch. Since integrated cubicles are used a shock-proof design is selected because of the switch impact of the circuit breaker.
Cubicle heating (option)
The cubicle heating is switched on automatically by a regulator depending on humidity and temperature.
Antipumping control of circuit breaker
Pump prevention stops the uncontrolled switching (pumping) of the circuit breaker when there is a continuous ON impulse and a simultaneously applied OFF impulse.
A single switching operation (ON / OFF) is permitted. With an applied OFF impulse, it is possible to switch on manually.
OFF blocking of the circuit breaker
The OFF blocking occurs if the drive energy for a trip,or if the SF6 gas density in the C.B. housing is too low.
ON blocking of the circuit breaker
The ON blocking occurs if the drive energy for a Close/Trip sequence or the SF6 gas density in the C.B. gas compartment is too low.
Control and supervision of the hydraulic pump S Control:
The hydraulic pump is activated under the following conditions:
When the circuit breaker is switched on:
S Spring travel switch contact ‘Motor ON’ closed
When the circuit breaker is switched off:
S Spring travel switch contact ‘CO blocking’ closed
In this way, varying energy reserves are stored in the operating mechanism depending on the switch status. A circuit breaker OCO cycle is therefore al-ways possible in the ON status, while in OFF status the energy reserve ranges from OCO (newly recharged) to CO cycles.
This ensures that the hydraulic pump does not start up as soon as the circuit breaker is switched off, which is particularly important for the battery layout of an installation, especially when the bus bar protection causes several C.B.
trips.
The control starts up the hydraulic pump after switching on the circuit
breaker. Within approx. 10 seconds, the energy required for an OCO cycle is available again.
This results in staggered start-up times for the hydraulic pump motors. A time relay limits the pump running time in the case of an error.
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4.18.2.2 Options
The following optional functions can be added on request:
Measured Values
S Power
Active power
The respective values are calculated from the electrical current and voltage in the REF542plus, shown on the display and can be transmitted via the station bus.
Reactive power
The respective values are calculated from the electrical current and volt-age in the REF542plus, shown on the display and can be transmitted via the station bus.
Apparent power
The respective values are calculated from the electrical current and volt-age in the REF542plus and can be transmitted via the station bus.
S cos phi
The appropriate values are measured and can be transmitted via the station bus.
Indications
S Indications from protection system
External protection system:
When using the REF542plus together with a protection system from an external supplier, signals can be integrated via BI and transmitted to the station control system via the station bus.
Protection system with station bus connection:
The messages are transmitted from the protection device to the super-ordinate control system via the station bus.
In this case, the disturbance recordings can be transmitted via the sta-tions bus as well.
S Indications from transformer
The appropriate signals can be connected to the REF542plus using BI and transmitted via the station bus.
Station control interface (e.g. for MicroSCADA) / remote control system By using a plug-in board, the REF542plus can be connected to a bus system (e.g. ABB LON Bus).
It is possible to use this to connect a station control system (e.g. ABB MicroSCADA) or a remote control system.
This bus can be used in the monitoring direction to transmit the position indications of the switchgear and the measured values.
In control direction, commands for the remote control of the bay can be received by REF542plus.
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