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1MRK 504 165-UEN Rev. K
11.5
Current protection
11.5.1
Instantaneous phase overcurrent protection 3-phase output
PHPIOC
Prepare the IED for verification of settings outlined in Section
Values of the logical signals for PHPIOC are available on the local HMI under Main menu /Tests /
Function status /Current protection /InstPhaseOverCurrent(50,3I>>) /PHPIOC(50;3I>>):x ,
where x = 1, 2, and 3.
The Signal Monitoring in PCM600 shows the same signals that are available on the local HMI.
To verify the settings the following fault type should be tested:
•
Phase-to-earth fault
Ensure that the maximum continuous current, supplied from the current source used for the test of
the IED, does not exceed four times the rated current value of the IED.
11.5.1.1
Measuring the operate limit of set values
1.
Set the operation mode to 1 out of 3.
2.
Inject a phase current into the IED with an initial value below the set value of IP>> and also
make sure that the set value IP>> is in between IP>>Min and IP>>Max.
3.
Increase the injected current in the Ln phase until the TRLn (n=1–3) signal appears.
4.
Switch the fault current off.
5.
Compare the measured operating current with the set value.
6.
Set the operation mode to 2 out of 3 and inject current into one of the phases and then check
that no TRLn signal appears.
11.5.1.2
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.5.2
Directional phase overcurrent protection, four steps OC4PTOC
Prepare the IED for verification of settings outlined in Section
Values of the logical signals for OC4PTOC are available on the local HMI under Main menu/Tests/
Function status/Current protection/PhaseOverCurrent4Step(51_67,4(3I>)) /
OC4PTOC(51_67;4(3I>)):x, where x = instance number.
The Signal Monitoring in PCM600 shows the same signals that are available on the local HMI.
Transformer protection RET670
Commissioning manual
Observe: Do not exceed the maximum permitted overloading of the current circuits
in the IED.
© 2017 - 2022 Hitachi Energy. All rights reserved
Testing functionality by secondary injection
"Preparing the IED to verify
"Preparing the IED to verify
Section 11
SEMOD53531-1 v1
M11754-3 v8
settings".
M11754-11 v7
M11754-24 v5
SEMOD56287-67 v9
settings".
159
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