current of an IED does not exceed four times Its rated value, if the measurement of the operating
characteristics runs under constant voltage conditions.
Measuring the operate limit of set values of load encroachment function
The load encroachment does not have any special output to be verified. It can only be verified with the
distance PICKUP and TRIP outputs.
Steps to test the load encroachment:
1. Supply the IED with healthy conditions for at least two seconds.
2. Apply the fault condition and slowly decrease the injected impedance to find the trip value for of the
phase-to-ground and phase-to-phase loops.
Under voltage seal-in
GUID-1219D2CC-D2EC-44B1-8F2E-A4C292590680 v2
The under voltage seal-in logic can be verified using the 27 Trip and 27 PU outputs.
Steps to verify the logic:
1. Keep all the current and voltage in normal balanced condition.
2. Keeping the phase current at rated value, slowly reduce the voltage till it enters into the respective
zone mho characteristics and also below the set value of the under voltage seal-in logic.
3. Before the trip time delay of the respective zone, reduce the current magnitude so that the operating
impedance moves out of the mho characteristics.
4. The under voltage seal-in should give a PICKUP and TRIP after the trip time delay is set for the
under voltage logic.
11.4.16.2 Completing the test
GUID-93110921-550A-441F-A36F-901488CC41BB v3
Continue to test another function or end the testing by setting the parameter TestMode to Disabled under
Main menu /Tests /IED test mode /1: TESTMODE . If another function 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
SEMOD53531-1 v1
11.5.1 Instantaneous phase overcurrent protection 3-phase output
PHPIOC (50)
M11754-3 v8
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
1MRK 504 165-UUS Rev. J Section 11
Testing functionality by secondary injection
Transformer protection RET670 167
Commissioning manual
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