Problem
Solution
The measured current
amplitudes are OK but
the angles are strange./
The phase unbalance
protection trips
immediately after
activation./
The earth fault
protection trips
immediately after
activation.
The phase currents are connected to the measurement module but the order or polarity of one or all
phases is incorrect. In relay settings, go to
Measurement
→
Phasors and check the "Phase current
vectors" diagram. When all connections are correct, the diagram (symmetric feeding) should look
like this:
See the following tables for the most common problems with phase polarity and network rotation
(mixed phases).
The following image presents the most common problems with phase polarity. Problems with phase
polarity are easy to find because the vector diagram points towards the opposite polarity when a phase
has been incorrectly connected.
A
AQ
Q-C213
-C213
Instruction manual
Version: 2.04
60
Содержание AQ-C213
Страница 1: ...AQ C213 Capacitor bank protection IED Instruction manual ...
Страница 308: ...Figure 7 4 184 Example block scheme A AQ Q C213 C213 Instruction manual Version 2 04 307 ...
Страница 330: ...Figure 8 14 207 Panel cutout dimensions and device spacing A AQ Q C213 C213 Instruction manual Version 2 04 329 ...