Parameter Address
Default Min Max Unit Logic Diagram
Differential protec‐
tion
DIFF: Enable PSx
072 152 073 152 074 152 075 152
0: No
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This setting defines the parameter subset (setting group) in which differential
protection is enabled.
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DIFF: Vec.gr. ends a-b PSx
019 010 019 040 019 041 019 042
0 0 11 Fig. 3-81, (p. 3-115)
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For standard connection of the P631 (see Chapter “Installation and
Connection”), the vector group ID needs to be entered. For connection reversal
applied to one individual end, this can be taken into account in setting
(MAIN: Conn.meas.circ. IP,a or MAIN: Conn.meas.circ. IP,b).
The following algorithms apply:
Setting = ID + 6
If the addition results in a value > 12 then:
Setting = (ID + 6) – 12
If the phase currents of the low and high voltage sides are exchanged and if this
is not accounted for by the settings at MAIN: Conn.meas,circ. IP,z
(where z is end a,b,c or d) and MAIN: Conn.meas,circ. IY,z (where z is
end a,b or c) then the algorithm is:
Setting = 12 – ID
If an A-C-B phase sequence (or "anti-clockwise rotating field") is present then
this should be entered as a setting at the P631. In this case, the P631 will
automatically form the complementary value of the set vector group ID to the
number 12 (vector group ID = 12 – set ID).
For application of the P631 as machine protection, the setting must be 0 or 6
depending on the current transformer connection.
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DIFF: Idiff> PSx
072 142 073 142 074 142 075 142
0.20 0.10 2.50 Iref Fig. 3-85, (p. 3-118)
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Operate value of the differential protection function as referred to the reference
current of the relevant transformer end.
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DIFF: Idiff>> PSx
072 143 073 143 074 143 075 143
15.0 2.5 30.0 Iref Fig. 3-85, (p. 3-118)
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Threshold value of the differential current for deactivation of the inrush
stabilization function (harmonic restraint) and of the overfluxing restraint.
Note: If the threshold is set too high, it is possible for the P631 not to trip in the
presence of internal faults with transformer saturation.
7 Settings
P631
P631/EN M/R-11-C // P631-310-650 7-105
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