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3
74
Current circuit supervision (CTSU)
Current circuit supervision (CTSU)
Prepare the terminal for verification of settings as outlined in section "Preparing for
test" 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
current level detector by injecting current, one phase at a
time.
2.
Check the phase current blocking function for all three phas-
es by injecting 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 reference 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 set-
ting the test mode to off.
Chapter 11
Verifying settings by secondary
MinOp
injection
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