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“2PAND” is recommended for a transformer with small or midium capacity
whose second harmonic component in inrush current is genarally higher than that
of transformer with large capacity. This mode is applicable if [Phase matching] is
set to “Beta”.
Protection by DIF and HOC can perform instantaneous three-phase tripping of up to five breakers.
Any of the five breaker tripping signals DIFT-1 to DIFT-5 are enabled or disabled by the scheme
switch [DIF1] to [DIF5] settings.
Note: Models 203 and 204 are not provided with DIFT-4 and DIFT-5, and perform tripping of up to
three breakers.
DIF5
+
DIF4
+
DIF3
+
DIF2
+
TRIP
DIFT-1
DIFT-2
DIFT-3
DIFT-4 (*1)
DIFT-5 (*1)
≥1
352
DIFT TRIP
330
DIFT-DIF TP
DIF
&
331
DIFT-HOC TP
HOC
&
DIF1
+
&
&
&
&
&
224
≥1
≥1
&
&
&
&
HOC-A
HOC-B
HOC-C
2F-Lock
+
≥1
DIF-A
DIF-B
DIF-C
2F-A
2F-B
2F-C
5F-A
5F-B
5F-C
&
&
&
&
5F-Lock
+
DIFT
&
&
&
&
&
≥1
1
≥1
1
≥1
1
≥1
≥1 1
1
&
&
&
&
&
&
&
&
DIFTPMD
+
1P
3POR
Note:
(*1) Models 203 and 204 are not provided with DIFT-4 and DIFT-5.
(*2) [Phase matching]="Beta" setting only
41
42
43
44
45
46
97
96
95
98
99
100
&
&
&
1
DIF-A_BLOCK
1616
1
DIF-B_BLOCK
1617
1
DIF-C_BLOCK
1618
122
123
121
&
&
&
≥1
2PAND (*2)
374
HOC
DIF
&
&
≥1
≥1
≥1
Figure 2.2.1.2 Scheme Logic of Current Differential Protection