Hitachi Relion 670 Series Applications Manual page 102

Section 7
Impedance protection
IEC19000321 V1 EN-US
Figure 47:
Unblocking zone 1 and blocking other distance protection zones during power swing
This application refers to a blocking signal to the higher distance protection zones and allows zone 1 to
trip for faults during power swing. By doing this higher distance protection zones detect and block the
transient swing reducing the outage of connected loads from the service. Allowing zone 1 to operate and
clear faults avoids widespread damage of electrical equipment connected to adjacent transmission lines.
Figure 48
zone 1 and blocking higher zones of distance protection function during power swing.
Based on system studies, one can set the operation of power swing detection to either one-out-of-
three or two-out-of-three phase mode. In this example,
• For one-out-of-three phase mode, REL1PH is set by configuring ON from FXDSIGN function block
• connect ZMBURPSB output, PSB_START to input BLKZx (where x = 2,...5, RV and BU) of
ZMFPDIS function block
• connect ZMBURPSB outputs PSB_STCND, PSB_RELCND to inputs ORCND, RELCNDZ1 of
ZMFPDIS function block
• adapt PSB and PDIS settings based on the power network and its operating conditions and set
Operation to On in both the function blocks
• set OpModePSU to On in ZMBURPSB function block, that is, activating power swing unblocking
feature
96
ACT configuration to block all distance protection zones in ZMFPDIS using
ZMBURPSB
depicts how to configure ZMBURPSB and ZMFPDIS in ACT of PCM600 to achieve unblocking
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Phasor measurement unit RES670
Application manual