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116
Current circuit supervision (CTSU)
Current circuit supervision (CTSU)
Prepare the terminal for verification of settings as outlined in
this chapter.
The current circuit supervision function is conveniently tested with the same 3-phase test set as
used when testing the measuring functions in the REx 5xx.
Procedure
1.
Check the input circuits and the operate value of the I
level detector by injecting current, one phase at a time.
2.
Check the phase current blocking function for all three phases by in-
jecting current, one phase at a time.
The output signals shall reset with a delay of 1 s when the current exceeds
1.5·I1b.
3.
Inject a current 0.90·I1b to phase L1 and a current 0.15·I1b to the ref-
erence current input (I5).
4.
Decrease slowly the current to the reference current input and check
that blocking is obtained when the current is about 0.10·I1b.
5.
Continue to test another function or complete the test by setting the
test mode to off.
Chapter 13
Verifying settings by secondary
section 2 "Preparing for test"
current
MinOp
injection
in
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