Application Notes
P44x/EN AP/E33
MiCOM P441/P442 & P444
Page 35/220
&
Protection A
Protection B
Z1'
T1
&
Z2'
T2
&
Z3'
T3
&
Zp'
Tzp
Z4'
T4
&
≥
1
&
&
&
&
&
Z1'
T1
Z2'
T2
Z3'
T3
Zp'
Tzp
Z4'
T4
≥
1
tZ1
tZ2
tZ3
tZp
tZ4
tZ1
tZ2
tZ3
tZp
tZ4
Trip
Trip
P0543ENa
FIGURE 10 - LOGIC DIAGRAM FOR THE BASIC SCHEME
Figure 10 shows the tripping logic for the Basic scheme. Note that for the P441, P442 and
P444 relays, zone timers tZ1 to tZ4 are started at the instant of fault detection, which is why
they are shown as a parallel process to the distance zones. The use of an apostrophe in the
logic (eg. the ‘ in Z1’) indicates that protection zones are stabilised to avoid maloperation for
transformer magnetising inrush current. The method used to achieve stability is based on
second harmonic current detection.
The Basic scheme incorporates the following features :
Instantaneous zone 1 tripping. Alternatively, zone 1 can have an optional time delay of 0 to
10s.
Time delayed tripping by zones 2, 3, 4 and P. Each with a time delay set between 0 and
10s.
The Basic scheme is suitable for single or double circuit lines fed from one or both ends.
The limitation of the Basic scheme is that faults in the end 20% sections of the line will be
cleared after the zone 2 time delay. Where no signalling channel is available, then improved
fault clearance times can be achieved through the use of a zone 1 extension scheme or by
using loss of load logic, as described below. Under certain conditions however, these two
schemes will still result in time delayed tripping. Where high speed protection is required
over the entire line, then a channel aided scheme will have to be employed.
Содержание MiCOM P441
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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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