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RELAY COMMISSIONING
9-6
MIF Digital Feeder Protection
GEK-106273L
9.14
GROUND IOC HIGH SETTING UNIT (50NH)
•
Enable only 50NH function.
•
Set its time delay and pickup to the minimum possible.
•
With 0.9 times the pickup current the relay should not trip.
•
With 1.1 times the pickup current the relay should trip in between 10 to 50 ms.
•
With 4 times the pickup current the relay should trip in between 10 to 40 ms.
9.15
GROUND IOC LOW SETTING UNIT (50NL)
•
Enable only 50NL function.
•
Set its time delay and pickup to the minimum possible.
•
With 0.9 times the pickup current the relay should not trip.
•
With 1.1 times the pickup current the relay should trip in between 10 to 50 ms.
•
With 4 times the pickup current the relay should trip in between 10 to 40 ms.
9.16
PHASE TOC UNIT (51P)
The 3 curves IEC or ANSI (Inverse, Very Inverse, Extremely Inverse) and the Definite Time are tested with three
points for each curve (one “no-trip point” and two “trip points”). This gives us a total of 12 points for each protection
unit. The tests are carried out for different phases. Each point is tested with a different pick up and dial in order to test
the whole range of the relay.
Enable 51P function only, and set its current pickup value to the minimum possible.
9.16.1.
IEC INVERSE CURVE
•
Set the relay as follows:
51P Settings Group
Curve INVERSE
Time Dial
1
•
Apply 0.9 times the pickup current into phase A and the relay should not trip.
•
Apply 1.5 times the pickup current and the relay should trip between 15.3 and 19.7 sec.
•
Apply 5 times the pickup current and the relay should trip between 4.1 and 4.5 sec.
Summary of Contents for GEK-106273L
Page 19: ...GETTING STARTED 1 12 MIF Digital Feeder Protection GEK 106273L ...
Page 95: ...SETTINGS 5 38 MIF Digital Feeder Protection GEK 106273L ...
Page 101: ...I O CONFIGURATION 6 44 MIF Digital Feeder Protection GEK 106273L ...
Page 127: ...KEYPAD AND DISPLAY 8 26 MIF Digital Feeder Protection GEK 106273L ...
Page 147: ...INSTALLATION AND MAINTENANCE 10 2 MIF Digital Feeder Protection GEK 106273L ...
Page 199: ...ANNEX 5 HARMONIC FILTERING 15 4 MIF Digital Feeder Protection GEK 106273L ...