6. SYSTEM SETUP
6.8. Loop Control Option
The purpose of using LOOP CONTROL is to isolate a fault area and protect the normal operation area by coordinating with C/B or Recloser when a fault occurs.
Loop control is able to provide automation system with using Sectionalizing Recloser, MID point Recloser, TIE point Recloser.
Loop control is performed by voltage sensing of DV(Dead Line Voltage), LV(Live Line Voltage).
Sectionalizing Recloser(SEC)
When a fault is occurred from the source side of Sectionalizing Recloser and backup C/B operates, the line becomes DV and if it continues, it is figured as a permanent fault. Hence, Sectionalizing Recloser is opened. After Sectionalizing Recloser is opened and TIEpoint Recloser is closed, the current flows in opposite way. Therefore, the load side of Sectionalizing Recloser can keep the live line. When Load side of Sectionalizing Recloser has a fault, OCR Function is operated and the load side is disconnected.
MIDpoint Recloser(MID)
When a fault is occurred in the source side of MIDpoint Recloser and backup C/B or Sectionalizing Recloser operates, the line becomes DV status and if it continues, it is figured as a permanent fault, then automatically the setting is changed to Alternate setting. After changed to Alternate setting, when TIEpoint Recloser is closed, the current flows in opposite way. During TIEpoint Recloser closed, when a fault occurs, MIDpoint Recloser trips once and lockouts. After recovering the fault, connect C/B and when the line becomes LV, the setting is automatically changed to Primary setting and MIDpoint Recloser is closed.
When Load side of MIDpoint Recloser gets a fault, OCR Function is operated and disconnects the load side.
TIEpoint Recloser (TIE)
TIEpoint Recloser automatically closes when either Source side or Load side becomes DV. When a fault occurs during automatic closing, the recloser trips once and locks out.
TIEpoint recloser automatically opens when loop control operates automatic closing at both side and when both sides become DV.
LCD Initial Screen
Recloser type that is selected in Loop control, are displayed on LCD Initial Screen.
Press “ENT” KEY to check operation status on the Initial Screen to see loop control mode.
LOOP CONTROL: [SEC] , [MID], [TIE]
Display a selected type.
VS: [DV], [LV]
Display Source side voltage of Recloser either Dead line voltage or Live line voltage.
VL: [DV], [LV]
Display Load side voltage of Recloser either Dead line voltage or Live line voltage.
VSDLT: [ - ], [RUN]
Displays loop control function is operating due to the dead line voltage of Recloser’s Source side.
VLDLT: [ - ], [RUN]
Displays loop control function is operating due to the dead line voltage of Recloser’s Load side.
AUTO RESTORE T: [ - ], [RUN]
Displays Restoring status after Loop control operation.
LOOP CONTROL KEY
Use PROGRAM KEY to use Loop control on User interface Panel.
Figure 6-4. Loop Control Key
Program 1: Enable/Disables Loop control function.
Lamp is on when Loop control function is Enabled.
SEC, MID can be selected on CLOSE status and TIE can be selected on OPEN status.
Program 2: Enable/Disables Auto restoration function of
SEC, MID.
Lamp is on when Auto restoration function is enabled.
Auto restoration function is, after loop control operation, Auto Rest’ T” timer operates till timeout, and restores the preset values.
LOOP CONTROL [TIE] VS-[DV] VSDLT-[ - ] VL-[DV] VLDLT-[ - ] AUTO RESTORE T [ - ]
6.8.1. Setting
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / Type Select
Range NONE, SEC, MID, TIE
Default NONE Step ~
Select the Recloser Type and add Loop Control function. After selecting, press Program 1 Key to enable Loop Control.
NONE : Loop control is not in use.
SEC : SECtionalizing Recloser
MID : MIDpoint Recloser
TIE : TIEpoint Recloser
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / VRS to S/M
Range VS, VL
Default VS Step ~
Voltage Response Side to SEC&MID : The setting values are used
in SEC, MID.
Recloser operates upon selected side of voltage sensing.
Select the Voltage response side when Recloser type is SEC & MID
VS : Recloser’s Source Side(A,B,C phase) Voltage VL : Recloser’s Load Side(R,S,T phase) Voltage
Standard Model, EVRC2A uses VD(Voltage divider, CVD or RVD) to measure the voltage. It measures only A, B, C, R phases, phase S and T are not measured.
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / VRS to Tie
Range VS, VL, VS&VL
Default VS Step ~
Voltage Response Side to Tie : The setting value is used in TIE.
TIE operates upon selected side of voltage sensing.
VS : Recloser’s Source Side(A,B,C phase) Voltage VL : Recloser’s Load Side(R,S,T phase) Voltage
VS&VL : Loop control operates one of either Source side or load side
voltage becomes dead line voltage. [LOOP CONTROL]
>Type Select: NONE
>VRS - S/M: VS >VRS - Tie: VS
[LOOP CONTROL]
>Type Select: NONE >VRS - S/M: VS
>VRS - Tie: VS [LOOP CONTROL] >Type Select: NONE
>VRS - S/M: VS
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / VS wire
Range 3PN, 3PP, 1PN(A), 1PN(B), 1PN(C), 1PP(AB), 1PP(BC), 1PP(CA)
Default 3PN Step ~
Line VS Wire : Select Recloser’s Source side(A,B,C phase) voltage
sensor(VD or VT) connection type.
Selected phase is used to figure dead/live line voltage. VD type Control measures A, B, C phase voltage.
3PN : 3 Phase-Neutral
3PP : 3 Phase-Phase
1PN(A) : Phase A-Neutral
1PN(B) : Phase B-Neutral
1PN(C) : Phase C-Neutral
1PP(AB) : Phase A-Phase B
1PP(BC) : Phase B-Phase C
1PP(CA) : Phase C-Phase A
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / VL wire
Range 3PN, 3PP, 1PN(A), 1PN(B), 1PN(C), 1PP(AB), 1PP(BC), 1PP(CA)
Default 3PN Step ~
Line VL Wire : Select Recloser Load side(R,S,T phase) voltage
sensor(VD or VT) connection type.
Selected phase is used to figure dead/live line voltage.
Select 1PN(A) to measure R phase voltage for VD(CVD or RVD) type Control S,T phase are not measured.
3PN : 3 Phase-Neutral
3PP : 3 Phase-Phase
1PN(A) : Phase A-Neutral
1PN(B) : Phase B-Neutral
1PN(C) : Phase C-Neutral
1PP(AB) : Phase A-Phase B
1PP(BC) : Phase B-Phase C
1PP(CA) : Phase C-Phase A
[LOOP CONTROL] >VS Wire: 3PN >VL Wire: 1PN(A) >Cng Alt-Mid : OFF [LOOP CONTROL] >VS Wire: 3PN >VL Wire: 1PN(A) >Cng Alt-Mid : OFF
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / Cng Alt- Mid
Range OFF, ON
Default OFF Step ~
Change Alternate Setting at Mid Point : Set Value is used in
MID.
Select if Primary setting is automatically changed to Alternate setting, after set time (LL Regain T).
To use this function, Loop control (setting value) of Primary and Alternate shall be set as the same.
OFF : Turn off auto change.
ON : Turn on auto change.
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / Cng Alt-Tie
Range OFF, ON(VS), ON(VL), ON(BOTH)
Default OFF Step ~
Change Alternate Setting at Tie Point : Set value is used in TIE.
Select if Primary setting is automatically changed to Alternate setting, after set time (LL Regain T).
To use this function, Loop control (setting value) of Primary and Alternate shall be set as the same.
OFF : Turn off auto change.
ON(VS) : Turn on Auto change by measuring VS.
ON(VL) : Turn on Auto change by measuring VL.
ON(BOTH) : Turn on Auto change by measuring VS or VL.
[LOOP CONTROL] >Cng Alt-Tie: OFF >LC After Cl:DISABLE >LC After Op:DISABLE [LOOP CONTROL] >VS Wire: 3PN >VL Wire: 1PN(A) >Cng Alt-Mid : OFF
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / LC After Cl
Range DISABLE, ENABLE
Default DISABLE Step ~
Select After Manual Close : Setting value is used in SEC.
To select Loop Control automatically enable after recloser is closed by Manual operation. Manual close is referred when the operation signal is coming from remote or local. When Loop control function is enabled, PROGRAM 1 LED on User interface panel is turned on.
DISABLE : After Manual close, Loop control function is not
automatically activated.(Use PROGRAM 1 to activate it)
ENABLE : After Manual close, Loop control function is automatically
activated.
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / LC After Op
Range DISABLE, ENABLE
Default DISABLE Step ~
Select After Manual Open : Setting Value is used in TIE.
To select Loop control function automatically enable after recloser is opened by manual operation. Manual open is referred when the operation signal is coming from remote or local. When Loop control function is enabled, PROGRAM 1 LED on User interface panel is turned on.
DISABLE : After Manual open, Loop control function is not
automatically activated. (Use PROGRAM 1 to activate it)
ENABLE : After Manual open, Loop control function is automatically
activated.
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / OT Both DL
Range 1.00 ~ 600.00 sec
Default 10.00 Step 0.01 sec
Open Time on Both Dead Bus : Setting value is used in TIE.
After TIE closed, source and load sides become dead line for a certain period, TIE opens by Loop control.
[LOOP CONTROL] >OT Both DL: 10.00 >Auto Rest’ T: 5.00 >DL V Max(%): 50.0 [LOOP CONTROL] >Cng Alt-Tie: OFF >LC After Cl:DISABLE >LC After Op:DISABLE [LOOP CONTROL] >Cng Alt-Tie: OFF >LC After Cl:DISABLE >LC After Op:DISABLE
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / Auto Rest’ T
Range 1.00 ~ 600.00 sec
Default 5.00 Step 0.01 sec
Auto Restoration Time : Setting value is used in SEC, MID.
This is active when Program 2 on User Interface Panel is enabled. SEC operates Loop control (Automatic Open) if a voltage selected from “VRS – S/M” becomes dead line. After opened, the voltage becomes Live Line, a certain period later, restores (Automatic Close). MID, if a voltage selected form “VRS – S/M” becomes dead line, and when Loop control (“Chg Alt-Tie” is on, it automatically changes to Alternate Setting. After Loop control, Live Line becomes Tie Close, and during operation, it figures as a fault and Trip Lockout. After it becomes Live line, Restore (auto close and change to Primary setting).
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / DL V Max(%)
Range 20.0 ~ 70.0 %
Default 50.0 Step 0.1 %
Dead Bus Maximum Voltage(%) : Sense Dead Line Voltage.
In Live Line, when a voltage is decreased below a set value, it determines Dead Line.
In Source side, it is figured from a selected phase from “VS Wire”. In Load side, it is figured from a selected phase from “VL Wire”.
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / LL V Min(%)
Range 50.0 ~ 85.0 %
Default 70.0 Step 0.1 %
Live Bus Minimum Voltage(%) : Sense Live Line Voltage.
In Dead Line, when a voltage is increased over a set value, it determines Live Line.
In Source side, it is figured form a selected phase from “VS Wire”, In Load side, it is figured from a selected phase from “VL Wire”.
[LOOP CONTROL] >LL V Min(%): 70.0 >DL Pickup T: 50.00 >LL Regain T: 10.00 [LOOP CONTROL] >OT Both DL: 10.00 >Auto Rest’ T: 5.00 >DL V Max(%): 50.0 [LOOP CONTROL] >OT Both DL: 10.00 >Auto Rest’ T: 5.00 >DL V Max(%): 50.0
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / DL Pickup T
Range 1.00 ~ 600.00 sec
Default 50.00 Step 0.01 sec
Dead Bus Pickup Time Delay : During “DL Pickup T”, the line
becomes Dead Line and “LL Regain T” Timer shall be operated so that SEC, MID, TIE can operate.
“DL Pickup T” Timer is the Cumulative Timer to count Dead Line time while C/B or Recloser is doing re-close operation.
Timer is not reset regardless of Live Line and it is reset by “DL rest T” Timer. Setting shall be the same or bigger than the sum of C/B or recloser’s reclosing time.
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / LL Regain T
Range 1.00 ~ 600.00 sec
Default 10.00 Step 0.01 sec
Live Bus Pickup Time Delay : “DL Pickup T” shall be finished and
during reset time, the line shall not be Live Line.
SEC’s reset Time shall be longer than MID 5 seconds, and MID’s shall be longer than TIE’s 5 seconds.
When timer is finished, SEC is opened, MID changes Settings from Primary to Alternate(if Chg Alt-Mid is enable), and TIE is closed automatically after changing settings form Primary to Alternate(if Chg Alt-Tie is enable).
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / DBRT Time
Range 1.00 ~ 600.00 sec
Default 5.00 Step 0.01 sec
Dead Bus Reset Time : It is a delay timer to reset accumulated time
from “DL Pickup T”. This timer operates when “DL Pickup T” is set and the line becomes Live line.
[LOOP CONTROL] >LL Regain T: 10.00 >DL Reset T: 5.00 >NRT After LC: 10.00 [LOOP CONTROL] >LL V Min(%): 70.0 >DL Pickup T: 50.00 >LL Regain T: 10.00 [LOOP CONTROL] >LL V Min(%): 70.0 >DL Pickup T: 50.00 >LL Regain T: 10.00
PRIMARY SETTING / SYSTEM SETUP / LOOP CONTROL / NRT After LC
Range 0.00 ~ 600.00 sec
Default 10.00 Step 0.01 sec
Non Reclose Time After LC Action : Setting values are used in
MID, TIE.
This timer prevents from Reclosing when recloser operates due to a fault after Loop control.
After “LL Regain T” and changed Settings, while backward distributing line operating, if a fault occurs and MID trips within a set time, MID reclose. MID trips once and lockouts. If a fault occurs and MID trips after a set time, reclosing is executed.
After “LL Regain T”, when a fault occurs and TIE trips within a set time, TIE also, trips once and lockout. If a fault occurs and TIE trips after a set time, reclosing is executed.
[LOOP CONTROL]
>LL Regain T: 10.00
>DL Reset T: 5.00 >NRT After LC: 10.00
6.8.2. Loop Control Logic Diagram
6.8.3. Loop Control Application
5-Reclosers Loop Control
For five reclosers loop control, it consists of 2 sets of SEC(Sectionalizing Recloser), 2 sets of MID(MIDpoint Reclosers) and 1 set of TIE(TIEpoint Recloser). Setting is in-turn form Source side to SEC-MID-TIE.
In “Table 6-3. 5-Reclosers Setting”, the source side bushings of RC1, RC2, RC3 are installed for CB1 side. And the source side bushings of RC4, RC5 are installed for CB2 side.
Table 6-3. 5-Reclosers Setting
SETTING CB1 RC1 RC2 RC3 RC4 RC5 CB2
Type Select - SEC MID TIE MID SEC -
VRS – S/M - ←⎯⎯VS ←⎯⎯VS X ⎯⎯→VS ⎯⎯→VS -
VRS – Tie - X X VS&VL X X -
VS Wire - 3PN 3PN 3PN 3PN 3PN -
VL Wire - 1PN(A) 1PN(A) 1PN(A) 1PN(A) 1PN(A) -
Cng Alt-Mid - X ON X ON X -
Cng Alt-Tie - X X ON X X -
LC After Cl - ENABLE ENABLE X ENABLE ENABLE -
LC After Op - - X ENABLE X - - OT Both DL - X X 10.00 X X - Auto Rest’ T - 5.00 5.00 5.00 5.00 5.00 - DL V Max(%) - 50.0 50.0 50.0 50.0 50.0 - LL V Min(%) - 70.0 70.0 70.0 70.0 70.0 - DL Pickup T - 22.0 22.0 22.0 22.0 22.0 - LL Regain T - 5.00 10.00 15.00 10.00 5.00 - DL Reset T - 5.00 5.00 5.00 5.00 5.00 - NRT After LC - X 10.00 10.00 10.00 X -
PROGRAM 1 - ENABLE ENABLE ENABLE ENABLE ENABLE -
PROGRAM 2 - ENABLE ENABLE X ENABLE ENABLE -
Reclose Time 2sec-1st reclose, 5sec-2nd reclose, 15sec-3rd reclose (lockout) “X” is not used.
5-Reclosers Loop control at F1 Fault
Figure 6-8. 5-Reclosers Loop Control at F1 Fault
Step1 : When Permanent Fault occurs at F1, CB1 operates reclosing sequence and then Trip Lockouts. During CB1 operation, accumulates Dead line time and the accumulated time becomes “DL Pick T”. When a line is Dead Line, “LL Regain T” operates.
“DL Pick T” is set by summing all reclosing time of back line equipment. SEC, MID, TIE has the same setting time.
Step2 : “LL Regain T” is set, and if the line is not becoming Live line within a set time, SEC(RC1), MID(RC2), TIE(RC3) operate.
To operate “LL Regain T” from SEC→MID→TIE in turn, MID shall have longer time set than SEC, TIE shall have longer time set than MID. When “LL Regain T” is enable, SEC(RC1) is opened automatically, MID(RC2) changes to Alternate setting.
Step3 : When “LL Regain T” is finished, TIE(RC3) changes to Alternate setting automatically, and then automatically close. F1 is isolated by Loop control operation, the rest of region shall be alive by backward distributing line.
Step4 : After removing a Fault, close CB1, then, SEC(RC1) automatically close after Auto- Restoration Time.
Step5 : Manually open TIE(RC3), change MID(RC2), TIE(RC3) setting to Primary setting. Enable Loop control of TIE(RC3) to recover the line as previous normal line.
5-Reclosers Loop control at F2 Fault
Figure 6-9. 5-Reclosers Loop Control at F2 Fault
Step1 : When Permanent Fault occurs at F2, SEC(RC1) operate reclosing sequence and tirp lockout. During SEC(RC1) operation, accumulate Dead line time, and the accumulated Dead line time becomes “DL Pick T”. When the line is Dead Line, “LL Regain T” operates.
“DL Pick T” is set by summing all reclosing time of back line equipment. MID, TIE point recloser has the same setting time.
Step2 : “LL Regain T” is set, and if the line is not becoming Live line within a set time, MID(RC2), TIE(RC3) operate. To operate “LL Regain T” from MID→TIE in turn, TIE shall have longer time set than MID.
When “LL Regain T” is enable, MID(RC2) changes to Alternate setting automatically. Step3 : When “LL Regain T” is finished, TIE(RC3) automatically close after changing to
Alternate setting.
Step4 : When closing TIE(RC3), MID(RC2) trip once and lockout because of F2 fault.
F2 is isolated by Loop control operation, the rest of region shall be alive by backward distributing line.
Step5 : After removing a Fault, close SEC(RC1), then, MID(RC3) automatically changes to Alternate setting after Auto Restoration Time.
Step6 : Manually open TIE(RC3) and change to Primary setting.
5-Reclosers Loop control at F3 Fault
Figure 6-10. 5-Reclosers Loop Control at F2 Fault
Step1 : When Permanent Fault occurs at F3, MID(RC2) operate reclosing sequence and tirp lockout. During MID(RC2) operation, accumulate Dead line time, and the accumulated Dead line time becomes “DL Pick T”. When the line is Dead Line, “LL Regain T” operates.
“DL Pick T” is set by summing all reclosing time of back line equipment.
Step2 : “LL Regain T” is set, and if the line is not becoming Live line within a set time, TIE(RC3) operate. When “LL Regain T” is enable, TIE(RC3) changes to Alternate setting automatically.
Step3 : When closing TIE(RC3), TIE(RC3) trip once and lockout because of F3 fault.
F3 is isolated by Loop control operation, the rest of region shall be alive by backward distributing line.
Step4 : After removing the fault, close MID(RC3)
Step5 : Manually open TIE(RC3) and change to Primary setting.
Enable Loop control of TIE(RC3), and recover the previous the line as the previous normal line.
3-Reclosers Loop Control
For three - reclosers loop control, it consists of 2 sets of SEC(Sectionalizing Recloser), 1 set of TIE(TIEpoint Recloser). Setting is in-turn form Source side to SEC and to TIE.
In “Table 6-4. 3-Reclosers Setting”, the source side bushings of RC1, RC2 are installed for CB1 side. And the source side bushings of RC3 are installed for CB2 side.
Table 6-4. 3-Reclosers Setting
SETTING CB1 RC1 RC2 RC3 CB2
Type Select - SEC TIE SEC -
VRS – S/M - ←⎯⎯VS X ⎯⎯→VS -
VRS – Tie - X VS&VL X -
VS Wire - 3PN 3PN 3PN -
VL Wire - 1PN(A) 1PN(A) 1PN(A) -
Cng Alt-Mid - X X X -
Cng Alt-Tie - X ON X -
LC After Cl - ENABLE X ENABLE -
LC After Op - - ENABLE - - OT Both DL - X 10.00 X - Auto Rest’ T - 5.00 5.00 5.00 - DL V Max(%) - 50.0 50.0 50.0 - LL V Min(%) - 70.0 70.0 70.0 - DL Pickup T - 22.0 22.0 22.0 - LL Regain T - 5.00 10.00 5.00 - DL Reset T - 5.00 5.00 5.00 - NRT After LC - X 10.00 X -
PROGRAM 1 - ENABLE ENABLE ENABLE -
PROGRAM 2 - ENABLE X ENABLE -
Reclose Time 2sec-1st reclose, 5sec-2nd reclose, 15sec-3rd reclose (lockout) “X” is not used.
3-Reclosers Loop control at F1 Fault
Figure 6-11. 3-Reclosers Loop control at F1 Fault
Step1 : When Permanent Fault occurs at F1, CB1 operates reclosing sequence and then Trip Lockouts. During CB1 operation, accumulates Dead line time and the accumulated time becomes “DL Pick T”. When a line is Dead Line, “LL Regain T” operates.
“DL Pick T” is set by summing all reclosing time of back line equipment. SEC, TIE has the same setting time.
Step2 : “LL Regain T” is set, and if the line is not becoming Live line within a set time, SEC(RC1), TIE(RC2) operate. To operate “LL Regain T” from SEC→TIE in turn, TIE shall have longer time set than SEC.
When “LL Regain T” is finished, SEC(RC1) is opened automatically, TIE(RC2) automatically changes to Alternate setting and close.
F1 is isolated by Loop control operation, the rest of region shall be alive by backward distributing line.
Step3 : After removing the fault, close CB1, SEC(RC1) is automatically closed after Auto Restoration Time.
Step4 : Manually open TIE(RC2) and change to Primary setting.
3-Reclosers Loop control at F2 Fault
Figure 6-12. 3-Reclosers Loop control at F2 Fault
Step1 : When Permanent Fault occurs at F2, SEC(RC1) operates reclosing sequence and then Trip Lockouts. During SEC(RC1) operation, accumulates Dead line time and the accumulated