Parameter Address
Default Min Max Unit Logic Diagram
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DIFF: Idiff>>> PSx
072 144 073 144 074 144 075 144
30.0 2.5 30.0 Iref Fig. 3-85, (p. 3-118)
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This setting defines the threshold value for the differential current where the
differential protection is triggered regardless of restraining quantity, inrush
stabilization and saturation discriminator.
Note: If the threshold is set too low, the P631 can trip in the presence of
external faults with transformer saturation.
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DIFF: Idiff>(CTS) PSx
080 000 081 000 082 000 083 000
0.20 0.10 30.00 Iref
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If the Current Transformer Supervision (CTS) function has detected a CT failure,
then the basic operating threshold DIFF: Idiff> PSx can be raised to a
settable safe value DIFF: Idiff>(CTS) PSx. Please refer to the CTS
function section for more details.
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DIFF: m1 PSx
072 145 073 145 074 145 075 145
0.30 0.10 1.50 Fig. 3-85, (p. 3-118)
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Gradient of the differential protection tripping characteristic for the range
0.5·I
diff>
< I
R
≤ I
R,m1
.
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DIFF: m2 PSx
072 146 073 146 074 146 075 146
0.70 0.10 1.50 Fig. 3-85, (p. 3-118)
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Gradient of the differential protection tripping characteristic for the
range I
R
> I
R,m2
.
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DIFF: IR,m2 PSx
072 147 073 147 074 147 075 147
4.0 1.5 10.0 Iref Fig. 3-85, (p. 3-118)
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Knee point where the tripping characteristic continues with the setting for
gradient m2.
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DIFF: Op.mode rush rst.PSx
072 148 073 148 074 148 075 148
1: Not phase-selective Fig. 3-85, (p. 3-118)
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Setting for the operating mode of the inrush stabilization function.
For application of the P631 as machine protection, harmonic restraint can be
disabled by way of this setting. For application of the P631 as transformer
protection, the user can select whether the harmonic restraint should operate in
cross-blocking mode or selectively for one measuring system.
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DIFF: RushI(2f0)/I(f0) PSx
072 159 073 159 074 159 075 159
20 10 50 % Fig. 3-86, (p. 3-119)
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Operate value of the inrush stabilization (harmonic restraint) of differential
protection as a ratio of the second harmonic with the fundamental component of
the differential current, in percent.
P631
7 Settings
7-106 P631/EN M/R-11-C // P631-310-650
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