Micom P634 - Page 733

Transformer end a b, c, d
Vector group ID 0=12 2 4 6 8 10
DIFF: Diff. current 1 0.00 0.00 1.00 1.00 0.00 1.00 1.00
DIFF: Diff. current 2 1.00 1.00 1.00 0.00 1.00 1.00 0.00
DIFF: Diff. current 3 1.00 1.00 0.00 1.00 1.00 0.00 1.00
Tab. 10-4: Factors for single-side, two-phase, phase-opposition feed in phases B to C, not zero
sequence-filtered.
The connection of the phase currents can be checked using the phase angles
provided as measured operating data by the P634.
If the phase currents are connected correctly and there is an ideal balanced load
on the transformer, the phase angles between the phase currents of any one
transformer end are displayed as follows:
Phase sequence A–B–C
●
φ
AB,z
= φ
BC,z
= φ
CA,z
= 120°
Phase sequence A–C–B
●
φ
AB,z
= φ
BC,z
= φ
CA,z
= −120°
This is not influenced by the set value of the function parameter for the phase
sequence.
The phase angle between the phase currents of two transformer ends for a
particular phase is a function of the vector group of the transformer. This phase
angle should be displayed as follows:
Vector group
0 = 12 φ
x,A–z
= ±180°
1 φ
x,A–z
= −150°
2 φ
x,A–z
= −120°
3 φ
x,A–z
= −90°
4 φ
x,A–z
= −60°
5 φ
x,A–z
= −30°
6 φ
x,A–z
= 0°
7 φ
x,A–z
= 30°
8 φ
x,A–z
= 60°
9 φ
x,A–z
= 90°
10 φ
x,A–z
= 120°
11 φ
x,A–z
= 150°
10 Commissioning P634
P634/EN M/R-42-A // P634‑311‑653 10-9