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Secondary system supervision Chapter 11
Verifying settings by secondary
injection
10 Secondary system supervision
10.1 Current circuit supervision (RDIF)
Prepare the IED for verification of settings as outlined in section 1 "Overview" and section 2
"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 REx670.
The condition for this procedure is that the setting of IMinOp is lower than the setting of
Ip>Block
Procedure
1. Check the input circuits and the operate value of the IMinOp current
level detector by injecting current, one phase at a time
2. Check the phase current blocking function for all three phases by in-
jection current, one phase at a time. The output signals shall reset
with a delay of 1 second when the current exceeds 1.5*
IBase
3. Inject a current 0.9*IBase to phase L1 and a current 0.15*IBase 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 0.1*
IBase
5. Continue to test another function or complete the test by setting the
test mode off
10.2 Fuse failure supervision (RFUF)
Prepare the IED for verification of settings as outlined in section 1 "Overview" and section 2
"Preparing for test" in this chapter.
The verification is divided in two main parts. The first part is common to all fuse failure super-
vision options, and checks that binary inputs and outputs operate as expected according to actual
configuration. In the second part the relevant set operate values are measured.
The corresponding binary signals that inform the operator about the operation of the FUSE func-
tion are available on the local HMI under the menu:
Test\Function status\Secondary System Supervision\FuseFailure(RFUF)\FSO
10.2.1 Checking that the binary inputs and outputs operate as expected
Procedure
1. Simulate normal operating conditions with the three-phase currents
in phase with their corresponding phase voltages and with all of
them equal to their rated values.
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