Initiating Zcvpsof Automatically And Setting Mode To Impedance; Initiating Zcvpsof Automatically And Setting Mode To Vilevel; Completing The Test - ABB RET670 Commissioning Manual
Transformer protection
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Also See for RET670:
- Applications manual (1016 pages) ,
- Commissioning manual (318 pages) ,
- Installation and commissioning manual (240 pages)
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1MRK 504 165-UUS -
11.4.13.2
11.4.13.3
11.4.13.4
Transformer protection RET670 2.2 ANSI
Commissioning manual
1.
Set AutoInitMode to DLD disabled and Mode to Impedance.
2.
Activate the switch onto fault BC input.
During normal operating conditions, the BC input is de-energized.
3.
Apply a three-phase fault condition corresponding to a fault at approximately 45%
of the line or with impedance at 50% of the used zone setting and current greater than
30% of IBase.
The ZACC input is activated.
4.
Check that the TRIP output, external signals and indication are obtained.
Initiating ZCVPSOF automatically and setting mode to impedance
1.
Set AutoInitMode to Voltage and Mode to Impedance.
2.
Deactivate the switch onto fault BC input.
3.
Set the current and voltage inputs to lower than IphPickup and UVPickup for at least
one second.
4.
Apply a three-phase fault condition corresponding to a fault at approximately 45%
of the line or with impedance at 50% of the used zone setting and current greater than
30% of IBase.Apply a two-phase fault condition corresponding to a fault at
approximately 45% of the line or with impedance at 50% of the used zone setting and
current greater than 30% of IBase.
The ZACC input is activated.
5.
Check that the correct TRIP output, external signals and indication are obtained.
Initiating ZCVPSOF automatically and setting mode to VILevel
1.
Set AutoInitMode to Voltage and Mode to VILevel.
2.
Deactivate the switch onto fault BC input.
3.
Set the current and voltage inputs to lower than IphPickup and UVPickup for at least
one second.
4.
Apply the three-phase currents in such a way that the magnitudes are greater than
IphPickup and the three-phase voltages in such a way that the magnitudes and lower
than UVPickup at least for the duration of the tDuration setting.
5.
Check that the correct TRIP output, external signals and indication are obtained.
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled. Restore connections and settings to their original values, if they were changed
for testing purposes.
Testing functionality by secondary injection
Section 11
171
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