3
CIRCUIT BREAKER FAIL IMPLEMENTATION
Depending on the P64x model (P642, P643, P645), up to five independent sets of circuit breaker failure settings are
available, supporting one phase current and one earth undercurrent function for each set. Each CB Failure set can
be enabled or disabled by the settings T1 CBF Status, T2 CBF Status, T3 CBF Status, T4 CBF Status and T5 CBF
Status respectively.
You can enable or disable each Earth undercurrent element with the IN< Status setting. If enabled, you can set
each earth undercurrent element as measured or derived using the IN< Input setting. When enabled, it can be set
as measured or derived. Depending on the model, you can use single phase CTs connected to the three nuetral CT
connections TN1, TN2 and TN3 for CB failure function (see wiring diagram). You define this with the IN< Terminal
setting.
3.1
CIRCUIT BREAKER FAIL TIMERS
The circuit breaker failure protection incorporates two timers, CB Fail 1 Timer and CB Fail 2 Timer, allowing
configuration for the following scenarios:
●
Simple CBF, where only CB Fail 1 Timer is enabled. For any protection trip, the CB Fail 1 Timer is started, and
normally reset when the circuit breaker opens to isolate the fault. If breaker opening is not detected, the CB
Fail 1 Timer times out and closes an output contact assigned to breaker fail (using the programmable
scheme logic). This contact is used to back-trip upstream switchgear, generally tripping all infeeds
connected to the same busbar section.
●
A retripping scheme, plus delayed back-tripping. Here, CB Fail 1 Timer is used to issue a trip command to a
second trip circuit of the same circuit breaker. This requires the circuit breaker to have duplicate circuit
breaker trip coils. This mechanism is known as retripping. If retripping fails to open the circuit breaker, a
back-trip may be issued following an additional time delay. The back-trip uses CB Fail 2 Timer, which was
also started at the instant of the initial protection element trip.
You can configure the CBF elements CB Fail 1 Timer and CBF Fail 2 Timer to operate for trips triggered by
protection elements within the device. Alternatively you can use an external protection trip by allocating one of the
opto-inputs to the External Trip DDB signal in the PSL.
You can reset the CBF from a breaker open indication (from the pole dead logic) or from a protection reset. In these
cases resetting is only allowed if the undercurrent elements have also been reset. The resetting mechanism is
determined by the settings Volt Prot Reset and Ext Prot Reset.
The resetting options are summarised in the following table:
Initiation (Menu Selectable)
CB Fail Timer Reset Mechanism
Current based protection
The resetting mechanism is fixed (e.g. 50/51/46/21/87)
IA< operates AND IB< operates AND IC< operates AND IN< operates
Sensitive Earth Fault element
The resetting mechanism is fixed.
ISEF< Operates
Non-current based protection (e.g. 27/59/81/32L)
Three options are available:
●
All I< and IN< elements operate
●
Protection element reset AND all I< and IN< elements operate
●
CB open (all 3 poles) AND all I< and IN< elements operate
External protection
Three options are available.
●
All I< and IN< elements operate
●
External trip reset AND all I< and IN< elements operate
●
CB open (all 3 poles) AND all I< and IN< elements operate
P64x
Chapter 10 - CB Fail Protection
P64x-TM-EN-1.3
229
Summary of Contents for P642
Page 2: ......
Page 18: ...Contents P64x xvi P64x TM EN 1 3 ...
Page 24: ...Table of Figures P64x xxii P64x TM EN 1 3 ...
Page 25: ...CHAPTER 1 INTRODUCTION ...
Page 26: ...Chapter 1 Introduction P64x 2 P64x TM EN 1 3 ...
Page 36: ...Chapter 1 Introduction P64x 12 P64x TM EN 1 3 ...
Page 37: ...CHAPTER 2 SAFETY INFORMATION ...
Page 38: ...Chapter 2 Safety Information P64x 14 P64x TM EN 1 3 ...
Page 50: ...Chapter 2 Safety Information P64x 26 P64x TM EN 1 3 ...
Page 51: ...CHAPTER 3 HARDWARE DESIGN ...
Page 52: ...Chapter 3 Hardware Design P64x 28 P64x TM EN 1 3 ...
Page 87: ...CHAPTER 4 SOFTWARE DESIGN ...
Page 88: ...Chapter 4 Software Design P64x 64 P64x TM EN 1 3 ...
Page 98: ...Chapter 4 Software Design P64x 74 P64x TM EN 1 3 ...
Page 99: ...CHAPTER 5 CONFIGURATION ...
Page 100: ...Chapter 5 Configuration P64x 76 P64x TM EN 1 3 ...
Page 121: ...CHAPTER 6 TRANSFORMER DIFFERENTIAL PROTECTION ...
Page 122: ...Chapter 6 Transformer Differential Protection P64x 98 P64x TM EN 1 3 ...
Page 165: ...CHAPTER 7 TRANSFORMER CONDITION MONITORING ...
Page 166: ...Chapter 7 Transformer Condition Monitoring P64x 142 P64x TM EN 1 3 ...
Page 189: ...CHAPTER 8 RESTRICTED EARTH FAULT PROTECTION ...
Page 190: ...Chapter 8 Restricted Earth Fault Protection P64x 166 P64x TM EN 1 3 ...
Page 215: ...CHAPTER 9 CURRENT PROTECTION FUNCTIONS ...
Page 216: ...Chapter 9 Current Protection Functions P64x 192 P64x TM EN 1 3 ...
Page 249: ...CHAPTER 10 CB FAIL PROTECTION ...
Page 250: ...Chapter 10 CB Fail Protection P64x 226 P64x TM EN 1 3 ...
Page 259: ...CHAPTER 11 VOLTAGE PROTECTION FUNCTIONS ...
Page 260: ...Chapter 11 Voltage Protection Functions P64x 236 P64x TM EN 1 3 ...
Page 274: ...Chapter 11 Voltage Protection Functions P64x 250 P64x TM EN 1 3 ...
Page 275: ...CHAPTER 12 FREQUENCY PROTECTION FUNCTIONS ...
Page 276: ...Chapter 12 Frequency Protection Functions P64x 252 P64x TM EN 1 3 ...
Page 286: ...Chapter 12 Frequency Protection Functions P64x 262 P64x TM EN 1 3 ...
Page 287: ...CHAPTER 13 MONITORING AND CONTROL ...
Page 288: ...Chapter 13 Monitoring and Control P64x 264 P64x TM EN 1 3 ...
Page 306: ...Chapter 13 Monitoring and Control P64x 282 P64x TM EN 1 3 ...
Page 307: ...CHAPTER 14 SUPERVISION ...
Page 308: ...Chapter 14 Supervision P64x 284 P64x TM EN 1 3 ...
Page 322: ...Chapter 14 Supervision P64x 298 P64x TM EN 1 3 ...
Page 323: ...CHAPTER 15 DIGITAL I O AND PSL CONFIGURATION ...
Page 324: ...Chapter 15 Digital I O and PSL Configuration P64x 300 P64x TM EN 1 3 ...
Page 336: ...Chapter 15 Digital I O and PSL Configuration P64x 312 P64x TM EN 1 3 ...
Page 337: ...CHAPTER 16 COMMUNICATIONS ...
Page 338: ...Chapter 16 Communications P64x 314 P64x TM EN 1 3 ...
Page 397: ...CHAPTER 17 CYBER SECURITY ...
Page 398: ...Chapter 17 Cyber Security P64x 374 P64x TM EN 1 3 ...
Page 415: ...CHAPTER 18 INSTALLATION ...
Page 416: ...Chapter 18 Installation P64x 392 P64x TM EN 1 3 ...
Page 431: ...CHAPTER 19 COMMISSIONING INSTRUCTIONS ...
Page 432: ...Chapter 19 Commissioning Instructions P64x 408 P64x TM EN 1 3 ...
Page 460: ...Chapter 19 Commissioning Instructions P64x 436 P64x TM EN 1 3 ...
Page 461: ...CHAPTER 20 MAINTENANCE AND TROUBLESHOOTING ...
Page 462: ...Chapter 20 Maintenance and Troubleshooting P64x 438 P64x TM EN 1 3 ...
Page 477: ...CHAPTER 21 TECHNICAL SPECIFICATIONS ...
Page 478: ...Chapter 21 Technical Specifications P64x 454 P64x TM EN 1 3 ...
Page 507: ...APPENDIX A ORDERING OPTIONS ...
Page 508: ...Appendix A Ordering Options P64x P64x TM EN 1 3 ...
Page 512: ...Appendix A Ordering Options P64x A4 P64x TM EN 1 3 ...
Page 513: ...APPENDIX B SETTINGS AND SIGNALS ...
Page 515: ...APPENDIX C WIRING DIAGRAMS ...
Page 516: ...Appendix C Wiring Diagrams P64x P64x TM EN 1 3 ...
Page 590: ......
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