P44x/EN AP/E33
Application Notes
Page 54/220
MiCOM P441/P442 & P444
•
If the signalling channel is taken out of service, the relay will operate in the
conventional Basic mode.
•
A current reversal guard timer is included in the signal send logic to prevent unwanted
trips of the relay on the healthy circuit, during current reversal situations on a parallel
circuit.
•
To allow time for a blocking signal to arrive, a short time delay on aided tripping, Tp,
must be used, as follows:
Recommended Tp setting
=
Max. signalling channel operating time + 14ms
2.9.5.1
Blocking Overreach Protection with Overreaching Zone 2 (BOP Z2)
This scheme is similar to that used in the other ALSTOM distance relays. Figure 30 shows
the zone reaches, and Figure 31 the simplified scheme logic. The signalling channel is
keyed from operation of the reverse zone 4 elements of the relay. If the remote relay has
picked up in zone 2, then it will operate after the Tp delay if no block is received.
Send logic:
Reverse Zone 4
Trip logic:
Zone 2, plus Channel NOT Received, delayed by Tp.
P3063XXa
ZL
Z1A
A
B
Z1B
Z2A
Z2B
Z4A
Z4B
FIGURE 30 - MAIN PROTECTION IN THE BOP Z2 SCHEME
P0533ENa
Protection A
Protection B
&
Z1'
T1
&
Z3'
T3
&
Zp'
Tzp
&
Z4'
T4
T2
Z2'
&
&
&
&
&
Z1'
T1
Z3'
T3
Zp'
Tzp
Z4'
T4
&
Tp
&
Emission
Téléac
Emission
Téléac
Z2'
T2
&
Tp
tZ1
tZ2
tZ3
tZp
tZ4
Signal
Send Z4'
Signal
Send Z4'
tZ1
tZ2
tZ3
tZp
tZ4
Trip
Trip
≥
1
≥
1
FIGURE 31 - LOGIC DIAGRAM FOR THE BOP Z2 SCHEME
(SEE TRIP LOGIC TABLE IN SECTION 2.8.2.4)
Содержание MiCOM P441
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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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