Hitachi RET670 Commissioning Manual page 198

Section 11
Testing functionality by secondary injection
Test of IMinReverse setting pickup value
1. Change the following settings from the default values:
•
•
•
2. Inject the following analogue quantities given in secondary amperes and volts and wait for
three seconds:
IN
UN
1) Inject set value for IMinReverse+1.5% of CT secondary rated current, (that is0.025A+0.015A when
3. The following signals that shall be given from the APPTEF function:
•
•
4. Inject the following analogue quantities given in secondary amperes and volts and wait for
three seconds:
IN
UN
1) Inject set value for IMinReverse –1.5% of CT secondary rated current, ( 0.025A-0.015A when IMinReverse
5. The following signal is given from the APPTEF function:
•
Test of function operation for high-ohmic EF
1. Change the following settings from the default values:
•
•
•
2. Inject the following analogue quantities given in secondary amperes and volts and wait for
three seconds in order to obtain the trip output (default delay for tTrip=2s):
192
The function did not operate for this forward EF now because the injected current is
below the set level.
OperationMode = Start and Trip in order to obtain the trip signal
IN>=3% (minimum value) in order not to interfere with this pickup test
IMinReverse =2.5% in order to be similar to the IN value
1)
IMinReverse =2.5% and CT rated secondary is 1A).
STUN at the beginning of injection.
STRV after approximately 150ms (default value for tStart=150ms)
The TRIP signal is not issued for EF in the reverse direction.
1)
=2.5% and CT rated secondary is 1A)).
Only STUN at the beginning of injection.
The function did not operate for this reverse EF now because the injected current is
below the set level.
OperationMode = Start and Trip in order to obtain the trip signal
IN>=5% (default value)
IMinForward =50% in order for standard logic not to operate for this test
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GUID-158772EA-D4DA-415D-A388-C2D9837414ED v1
Magnitude=40mA; Angle=0 degrees
Magnitude=75V; Angle=0 degrees
Magnitude=10mA; Angle=0 degrees
Magnitude=75V; Angle=0 degrees
GUID-99777636-56B6-4B0D-A796-6163B5DE94A2 v1
Transformer protection RET670
1MRK 504 165-UEN Rev. K
Commissioning manual