P44x/EN HW/E33
Relay Description
Page 32/44
MiCOM P441/P442 & P444
Single-phase fault
The reference voltage is stored in memory when the fault appears. When the fault is
eliminated by single-phase tripping, the high-speed single-phase auto-reclose (HSAR) is
started.
If a fault appears less than three cycles after the AR starts, the stored voltage value remains
valid as the reference and is used to calculate direction.
If no fault appears during the three cycles after the AR starts, the reference voltage value
becomes that of one of the healthy phases.
If a fault appears during the continuation of the AR cycle or reclosure occurs, the stored
voltage value remains valid for 10 seconds.
If a stored voltage does not exist (SOTF) when one or more loops are convergent within the
start-up characteristic, the directional is forced forward and the trip is instantaneous (if
“SOTF All Zones “ is set or according to the zone location if SOTF Zone 2, etc. is set). If the
settable switch on to fault current threshold I>3 is exceeded on reclosure, the relay
instantaneously trips three-phase.
Two-phase or three-phase fault
The reference voltage is stored in memory when the fault appears. When the fault is
cleared, the stored voltage value remains valid for 10 seconds. If reclosure occurs during
these 10 seconds, the direction is calculated using the stored voltage value.
If a stored voltage does not exist when one or more loops are convergent within the start-up
characteristic, the forward direction is forced and the trip is instantaneous when protection
starts (SOTF All Zones). If the switch on to fault current threshold I>3 is exceeded on
reclosure, the relay trips instantaneously three-phase (TOR All Zones).
The distance element trips immediately as soon as one or more loops converge within the
start-up characteristic during SOTF (SOTF All Zones).
Other modes can be selected to trip selectively by SOFT or TOR according to the fault
location (SOTF Zone 1, SOTF Zone 2, etc., TOR Zone 1, TOR Zone 2, etc. depending from
the software version - from V3.1 available) – (See section 2.12, in chapter P44x/EN AP).
4.4
Faulted Zone Decision
The Decision of the faulted zone is determined by either the zone "Deltas" or "Conventional"
algorithms.
The zones are defined for a convergence between the Dfault and Rfault limits related to
each zone. So, the solution pair (Rfault, Dfault) is said to be convergent if:
•
Rfault (n-1) < Rfault (i) and Rfault (n) < Rfault (i) and |Rfault (n-1) – Rfault (n)| < 10% x
Rfault (i)
•
Dfault (n-1) < Dfault (i) and Dfault (n) < Dfault (i) and |Dfault (n-1) - Dfault (n)| < k% x
Dfault (i)
where .
k=
5% for zones 1 and 1X
and
10% for other zones Z2, Z3, Zp and Z4.
i=1, 1X, 2, p, 3 and 4.
Содержание MiCOM P441
Страница 1: ...MiCOM P441 P442 P444 Numerical Distance Protection VC2 x Technical Guide P44x EN T E44...
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Страница 5: ...Pxxxx EN SS C11 SAFETY SECTION...
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Страница 152: ...P44x EN HW E33 Relay Description Page 24 44 MiCOM P441 P442 P444 Example isolated AC fault...
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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...
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