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1MRK 511 409-UUS Rev. K
Non-directional ground fault current protection
Procedure
1.
Measure that the trip current is equal to the INNonDirPU setting.
The function activates the PICKUP and PUDIRIN output.
2.
Measure the trip time of the timer by injecting a current of 200% of the trip value.
3.
Compare the result with the expected value.
The expected value depends on whether definite time tINNonDir or inverse time was selected.
4.
Continue to test another function or complete the test by setting the test mode to Disabled.
Residual overvoltage release and protection
Procedure
1.
Measure that the trip voltage is equal to the VN_PU setting.
The function activates the PICKUP and PUVN signals.
2.
Measure the trip time by injecting a voltage 1.2 times set VN_PU trip value.
3.
Compare the result with the set tVN trip value.
4.
Inject a voltage 0.8 · VNRelPU and a current high enough to trip the directional function at the
chosen angle.
5.
Increase the voltage until the directional function is released.
6.
Compare the measured value with the set VNRelPU trip value.
11.4.4.2
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.4.5
Thermal overload protection, one time constant, Fahrenheit/
Celsius LFPTTR/LCPTTR (26)
Prepare the IED for verification of settings as outlined in section
for test"
in this chapter.
Check that the input logical signal BLOCK is logical zero and that on the local HMI, the logical signal
TRIP, PICKUP and ALARM are equal to logical zero.
11.4.5.1
Measuring the trip and time limit of set values
Testing the protection without external temperature compensation (NonComp)
1.
Quickly set the measured current (fault current) in one phase to about 300% of IRef (to minimise
the trip time), and switch the current off.
2.
Reset the thermal memory on the local HMI under Main menu /Reset /Reset temperature /
ThermalOverload1TimeConst(PTTR,26) /LFPTTR:x , Main menu /Reset /Reset temperature /
ThermalOverload1TimeConst(PTTR,26) /LCPTTR:x ,
3.
Switch the fault current on and take note of the temperature, available on the local HMI under Main
menu /Test /Function status /Current protection /ThermOverLoad1TimeConst(PTTR,26) /
LFPTTR:x /TEMP , Main menu /Test /Function status /Current protection /
ThermOverLoad1TimeConst(PTTR,26) /LCPTTR:x /TEMP ,
Phasor measurement unit RES670
Commissioning manual
© 2017 - 2022 Hitachi Energy. All rights reserved
Testing functionality by secondary injection
"Requirements"
and section
Section 11
SEMOD175060-117 v10
SEMOD175060-131 v6
SEMOD175060-148 v4
M14950-2 v7
"Preparing
M14950-8 v3
M14950-10 v10
115
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