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Section 8
Impedance protection
446
IEC06000550 V1 EN-US
Figure 241:
An occurring cross-country fault on different feeders in a sub-
transmission network, high impedance (resistance, reactance)
earthed
en06000551.vsd
IEC06000551 V1 EN-US
Figure 242:
The voltage increase on healthy phases and occurring neutral
point voltage (3U0) at a single phase-to-earth fault and an
occurring cross-country fault on different feeders in a sub-
transmission network, high impedance (resistance, reactance)
earthed
PPLPHIZ is connected between Distance protection zone, quadrilateral
characteristic function ZMQPDIS and ZMQAPDIS and Phase selection with load
encroachment, quadrilateral characteristic function FDPSPDIS as shown in
figure 243. The integer from the phase selection function, which gives the type of
fault undergoes a check and will release the distance protection zones as decided by
the logic. The logic includes a check of the fault loops given by the phase selection
L3N
L1N
Line distance protection REL670 2.2 IEC
1MRK 506 369-UEN B
Load
Load
en06000550.vsd
Application manual
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