The service value output NSCURR indicating amplitude of negative sequence current in
primary amperes should be 962A approximative.
11.5.14.2 Completing the test
Continue to test another functions or end the test by changing the Test mode setting to Off.
Restore connections and settings to their original values, if they were changed for testing
purposes. Make sure that all built-in features for this function, which shall be in operation,
are enabled and with correct settings.
11.5.15 Voltage-restrained time overcurrent protection VRPVOC(51V)
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to
verify settings".
11.5.15.1 Verifying the settings
Verifying settings by secondary injection
1. Connect the test set for three-phase current injection and three-phase voltage
injection to the appropriate IED terminals.
2. Go to Main menu/Settings/IED Settings/Current protection/
VoltageRestOverCurr ( 51V,2(I>/V<))/VRPVOC (51V,2(I>/V<)):1/General
and make sure that the function is enabled, that is, Operation is set to Enabled.
3. The test of the function may be performed by injecting restrain voltage and
increasing the injected current(s). Note the value at which the PICKUP and STOC
signals are set.
In the following equations, restrain voltage is the magnitude of the
minimum phase-to-phase voltage in secondary volts.
The set trip value in secondary amperes is calculated according to the following
equations:
First part of the characteristic (Restrain voltage ≤ 25% of VBase):
Picup Curr
IBase
CT
CTprim
VDepFact_ sec
100 100
× × ×
ANSI13000291 V1 EN (Equation 91)
Second part of the characteristic (25% of VBase ≤ Restrain voltage ≤ VHighLimit/
100*VBase), valid when setting parameter VDepMode = Slope:
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
208 Transformer protection RET670 2.2 ANSI
Commissioning manual
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