●
x: phase A, B or C
●
z: transformer end (a, b, c, d)
●
measuring system 1, 2 or 3
●
I
d,y
: differential current as displayed
●
k
am,z
: amplitude-matching factor of transformer end a, b, c, d
●
k
s,y,z
: vector group-matching factor (see tables below)
●
I
test,x
: test current phase A, B or C
In evaluating the test results, one should be aware that the P634 will trip as
follows, if a value of I
diff>>
or I
diff>>>
is exceeded.
●
I
diff>>
exceeded: Trip regardless of the inrush and overfluxing restraint;
●
I
diff>>>
exceeded: Trip regardless of the restraining current and regardless
of all other restraints.
Transformer end a b, c, d
Vector group ID
0=1
2
1 2 3 4 5 6 7 8 9 10 11
DIFF: Diff. current 1 0.67 0.67 0.58 0.33 0.00 0.33 0.58 0.67 0.58 0.33 0.00 0.33 0.58
DIFF: Diff. current 2 0.33 0.33 0.00 0.33 0.58 0.67 0.58 0.33 0.00 0.33 0.58 0.67 0.58
DIFF: Diff. current 3 0.33 0.33 0.58 0.67 0.58 0.33 0.00 0.33 0.58 0.67 0.58 0.33 0.00
Tab. 10-1: Factors for single-side, one-phase feed in phase A, zero sequence-filtered.
Transformer end a b, c, d
Vector group ID
0=1
2
1 2 3 4 5 6 7 8 9 10 11
DIFF: Diff. current 1 0.00 0.00 0.58 1.00 1.15 1.00 0.58 0.00 0.58 1.00 1.15 1.00 0.58
DIFF: Diff. current 2 1.00 1.00 1.15 1.00 0.58 0.00 0.58 1.00 1.15 1.00 0.58 0.00 0.58
DIFF: Diff. current 3 1.00 1.00 0.58 0.00 0.58 1.00 1.15 1.00 0.58 0.00 0.58 1.00 1.15
Tab. 10-2: Factors for single-side, two-phase, phase-opposition feed in phases B to C, zero sequence-
filtered.
Transformer end a b, c, d
Vector group ID
0=12 2 4 6 8 10
DIFF: Diff. current 1 1.00 1.00 0.00 0.00 1.00 0.00 0.00
DIFF: Diff. current 2 0.00 0.00 0.00 1.00 0.00 0.00 1.00
DIFF: Diff. current 3 0.00 0.00 1.00 0.00 0.00 1.00 0.00
Tab. 10-3: Factors for single-side, one-phase feed in phase A, not zero sequence-filtered.
P634
10 Commissioning
10-8 P634/EN M/R-42-A // P634‑311‑653
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