is tested, then set the parameter Blocked to No under Main menu/Tests/Function test
modes/Impedance/ZGVPDIS/1: ZGVPDIS for the function, or for each individual
function in a chain, to be tested next. Remember to set the parameter Blocked to Yes, for
each individual function that has been tested.
11.5 Current protection
11.5.1 Instantaneous phase overcurrent protection 3-phase output
PHPIOC (50)
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to
verify settings".
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-ground 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 trip 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 TR_A (TR_B or TR_C) signal
appears.
4. Switch the fault current off.
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 177
Commissioning manual
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