Relay Description
P44x/EN HW/E33
MiCOM P441/P442 & P444
Page 39/44
Protection against Current Reversal (Transient Blocking)
When a fault occurs on a line, which is parallel to the protected line, the pilot schemes on the
protected line may be subjected current reversals from sequential clearing on the parallel
line. A fault on the parallel line may start by appearing external to the protected line in the
reverse direction, and then, after a sequential operation of one of the parallel line breakers,
the fault appears forward. This situation can affect security of certain pilot schemes on the
protected line.
P3041ENa
Reverse
Forward
Reverse
Forward
Forward
Forward
All breakers closed
Relay 3 senses reverse current
1
2
3
3
1
4
1
2
3
4
Breaker 1 opens
Relay 3 senses forward current
Forward
Weak
Source
Strong
Source
Strong
Source
Weak
Source
4
2
3
1
4
2
FIGURE 16 - DIRECTION REVERSAL FROM SEQUENTIAL CLEARING OF PARALLEL LINES
The P44x provides protection against the effects of this phenomenon by employing transient
blocking. An adjustable timer is available that will block direct and permissive transfer trip
signals from being used in the P44x logic, and will also block the P44x from sending direct or
permissive transfer trip signals. This timer is designated as «Reverse Guard Timer».
This provides protection against fault current reversal and will still allow fast tripping in the
event of faults occurring in zone 1, if zone 1 is independent (not used as overreach zone).
Содержание MiCOM P441
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Страница 101: ...Introduction P44x EN IT E33 MiCOM P441 P442 P444 INTRODUCTION...
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Страница 173: ...Application Notes P44x EN AP E33 MiCOM P441 P442 P444 APPLICATION NOTES...
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Страница 395: ...Technical Data P44x EN TD E33 MiCOM P441 P442 P444 TECHNICAL DATA...
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Страница 427: ...Installation P44x EN IN E33 MiCOM P441 P442 P444 INSTALLATION...
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Страница 439: ...Commissioning P44x EN CM E33 MiCOM P441 P442 P444 COMMISSIONING...
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Страница 495: ...Commissioning Test Record Sheets P44x EN RS E33 MiCOM P441 P442 P444 COMMISSIONING TEST RECORD SHEETS...
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Страница 521: ...Courrier Data Base P44x EN GC E44 MiCOM P441 P442 P444 CONFIGURATION MAPPING...
Страница 610: ...Courier Data Base P44x EN GC E44 MiCOM P441 P442 P444 DEFAULT PROGRAMMABLE SCHEME LOGIC PSL...
Страница 615: ...Menu Content Tables P44x EN HI E44 MiCOM P441 P442 P444 MENU CONTENT TABLES...
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