GE KVGC 202 - Runaway Protection

K
VCG202/EN M/H11
Technical
Manual
KVGC202
- circulating current setting (
Ic) 0.2 to 0.5A (1A) 0.1 to 2.5A (5A)
- the excessive circulating current time delay (t
IC) to 0 seconds].
For the 1A rated relay.
Check the relay current rating is set to 1A [0304 CONTROL].
Connect a current source to the (1A) circulating current terminals 23 & 24 with terminals
25 & 26 open.
For the 5A rated relay.
Check the relay current rating is set to 5A [0304 CONTROL].
Connect a current source to the (5A) circulating current terminals 25 & 26 with terminals
23 & 24 open.
Set the relay mask to operate ‘
Ic>’ and ‘Blocked’ relay output contacts. Both relay
contacts should be open.
Slowly increase the circulating current from zero and measure the current at which the
‘
Ic>’ relay contact closes. The text on the LCD display should indicate excessive
circulating current detected.
Check the measured current is in the range
Ic ±5%. Reduce the circulating current below
the threshold setting and the ‘
Ic>’ alarm should clear automatically along with the ‘Ic>’
text on the LCD.
Set the timer to start from application of circulating current and stop on closing of ‘
Ic>’
relay contacts.
Set the excessive circulating current time delay setting (t
IC) to 10 seconds. Set the
circulating current (
Ic) setting to 0.5In.
Apply 105% of
Ic to terminals 23 & 24 (terminals 25 & 26 for the 5A relay) and measure
the time. It should be 10 seconds ±5%. The ‘
Ic>’ relay contact should be closed.
Reduce the circulating current to zero.
Set the logic link LOG2 to ‘1’, the alarm condition will now also cause the blocking of the
tap control operation.
Slowly increase the circulating current from zero and measure the current at which the
‘
Ic>’ relay contact closes. The text on the LCD display should indicate excessive
circulating current detected.
The ‘
Ic>’ and ‘Blocked’ relay contacts should be closed. Both ‘Raise volts’ and ‘Lower
volts’ contacts should be open.
Remove the current flowing into the circulating current detector.
[Restore the following settings:
- logic link LOG2,
- initial time delay setting (tINIT),
- intertap delay (tINTER),
- circulating current setting (
Ic),
- the excessive circulating current time delay (t
IC)].
9.7.6 RunAway protection
The relay should be commissioned with the settings calculated for the application.