Undervoltage Elements (27P, 27X); Element - GE F650 User Manual

CHAPTER 6: COMMISSIONING

6.14 Undervoltage elements (27P, 27X)

6.14.1 27P element
Set the relay to trip for the protection element being tested. Configure any of the outputs to be activated only by the
protection element being tested.
Set the relay as follows:
Apply voltage as indicated on the table over the undervoltage setting level and verify that the relay does not trip.
Decrease voltage level gradually and verify that the relay trips for the set voltage (with an admissible error of 5%).

Element

Phase
27P VI
6.14.2 27X element
Set the relay to trip for the protection element being tested. Configure any of the outputs to be activated only by the
protection element being tested.
Set the relay as follows
Apply voltage as indicated on the table over the undervoltage setting level and verify that the relay does not trip.
Decrease voltage level gradually and verify that the relay trips for the set voltage (with an admissible error of 5%).
Element Input
27X VX
GEK-113000-AF
PHASE UV (27P)
Function
Mode
Pickup Level
Curve
Delay
Minimum Voltage
Logic
Supervised by 52
Curve Pickup Delay
Level
DEFINITE 50 V 2
TIME
GENERAL SETTINGS
Auxiliary Voltage
AUXILIARY UV (27X)
Function
Pickup Level
Curve
Delay
Curve Pickup Delay
Level
DEFINITE 50 V 2
TIME
F650 DIGITAL BAY CONTROLLER
6.14 UNDERVOLTAGE ELEMENTS (27P, 27X)
ENABLED
PHASE-GROUND
50 V
DEFINITE TIME
2.00 sec
30 V
ANY PHASE
DISABLED
Applied Tripping times (s)
Voltage
EXPECTED
55 V NO TRIP
45 V 2.000 sec
VX
ENABLED
50 V
DEFINITE TIME
2.00 sec
Applied Tripping time (s)
Voltage
EXPECTED
55 V NO TRIP
45 V 2.000 sec
Admissible
NA
[2.000 – 2.100]
Admissible
NA
[2.000 – 2.100]
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