Micom P634 - Page 508

Parameter Address
Default Min Max Unit Logic Diagram
Ground differential
protection
REF_1: Enable PSx
072 141 073 141 074 141 075 141
0: No Fig. 3-99, (p. 3-142)
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REF_2: Enable PSx
072 161 073 161 074 161 075 161
0: No
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REF_3: Enable PSx
072 031 073 031 074 031 075 031
0: No
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This setting defines the parameter subset in which ground differential protection
is enabled.
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REF_1: Operating mode PSx
072 149 073 149 074 149 075 149
1: Low imped. / sum(IP)
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REF_2: Operating mode PSx
072 169 073 169 074 169 075 169
1: Low imped. / sum(IP)
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REF_3: Operating mode PSx
072 049 073 049 074 049 075 049
1: Low imped. / sum(IP)
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Three operating modes can be selected. The Low imped. / sum(IP) operating
mode is the existing low impedance ground differential protection mode
(already existing since version P634–602). The alternative selectable modes are
Low imped. / IP,max and High impedance.
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REF_1: Bl.f.DIFF trigg. PSx
080 006 081 006 082 006 083 006
0: No Fig. 3-99, (p. 3-142)
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REF_2: Bl.f.DIFF trigg. PSx
080 007 081 007 082 007 083 007
0: No
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REF_3: Bl.f.DIFF trigg. PSx
080 008 081 008 082 008 083 008
0: No
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This setting determines whether the ground-differential short circuit protection
is blocked in case of a starting of the differential protection.
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REF_1: CTS effective PSx
080 003 081 003 082 003 083 003
0: No
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REF_2: CTS effective PSx
080 004 081 004 082 004 083 004
0: No
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REF_3: CTS effective PSx
080 005 081 005 082 005 083 005
0: No
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This setting determines whether the ground-differential short circuit protection
associated with the corresponding CTS signal, CTS: Alarm end a (or
CTS: Alarm end b etc.), is blocked.
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REF_1: Idiff> PSx
072 150 073 150 074 150 075 150
0.20 0.10 1.00 Iref Fig. 3-103, (p. 3-148)
P634 7 Settings
7-154 P634/EN M/R-42-A // P634‑311‑653