Table 1166: Special conditions
Condition Description
U3P connected to real meas-
urements
The function can work with any two phase voltage channels
connected but it is recommended to connect all three volt-
age channels.
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings.
For troubleshooting, check the contents of this chapter and also the preprocessing
blocks in this document. The configuration can be written to the protection relay
once the mismatch is corrected.
5.8.5 Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "On" and "Off".
The operation of CVPSOF can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
OPERATE
START
Trigger
SOTF
control
Dead-line
detector
START_DLYD
CB_CL_CMD
SOTF
detection
BLOCK
I3P
I_A
I_C
I_B
U3P
U_C
U_B
U_A
Figure 697: Functional module diagram
Trigger
This module is used for detecting a possible fault immediately after circuit breaker
closing. The use of external protection function, typically the start signal from a
Protection related functions
1MRS759142 F
1224 REX640
Technical Manual
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