The polarity of Phase L3 (C) is incorrect.
Phase currents:
IL1: 1.00 × In / 0.00 deg
IL2: 1.00 × In / 240.00 deg
IL3: 1.00 × In / 300.00 deg
Sequence currents:
I1: 0.33 × In / 0.00 deg
I2: 0.67 × In / 60.00 deg
I0Calc: 0.67 × In / -60.00 deg
Solution options:
- switch the wires between the connectors 5 and 6 in the CT module
- invert the polarity of IL1 (
Measurement
→
Transformers
→
Phase CT scaling
)
The following table presents the most common problems with network rotation (mix phases). These
problems can be dif cult to nd because the measurement result is always the same in the relay. If two
phases are mixed together, the network rotation always follows the pattern IL1-IL3-IL2 and the
measured negative sequence current is therefore always 1.00 (in. p.u.).
Table. 5.2.1. - 6. Common network rotation (mixed phases) problems.
Phases L1 (A) and L2 (B) have switched places (network rotation wrong).
Phase currents:
IL1: 1.00 × In / 0.00 deg
IL2: 1.00 × In / 120.00 deg
IL3: 1.00 × In / 240.00 deg
Sequence currents:
I1: 0.00 × In / 0.00 deg
I2: 1.00 × In / 0.00 deg
I0Calc: 0.00 × In / 0.00 deg
Solution:
- switch the wires between the connectors 1 and 3 in the CT module
AQ-E215
Instruction manual
Version: 2.01
41
© Arcteq Relays Ltd