Figure. 5.3.13 - 137. Normal situation.
Figure. 5.3.13 - 138. Earth fault in isolated network.
Figure. 5.3.13 - 139. Close-distance short-circuit between phases 1 and 3.
The sequence voltage function uses a total of eight (8) separate setting groups which can be selected
from one common source.
The function can operate on instant or time-delayed mode. In time-delayed mode the operation can be
selected between definite time (DT) mode and inverse definite minimum time (IDMT).
The operational logic consists of the following:
• input magnitude selection
• input magnitude processing
• threshold comparator
• block signal check
• time delay characteristics
• output processing.
The inputs for the function are the following:
• operating mode selections
• setting parameters
A
AQ
Q-T215
-T215
Instruction manual
Version: 2.04
188