CHAPTER 10: COMMISSIONING
10.14 UNDERVOLTAGE ELEMENTS (27P, 27X)
GEK-106310-AF
F650 DIGITAL BAY CONTROLLER
10-17
10.14 Undervoltage elements (27P, 27X)
10.14.1 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%).
10.14.2 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%).
PHASE UV (27P)
Function
ENABLED
Mode
PHASE-GROUND
Pickup Level
50 V
Curve
DEFINITE TIME
Delay
2.00 sec
Minimum Voltage
30 V
Logic
ANY PHASE
Supervised by 52
DISABLED
Element
Phase
Curve
Pickup
Level
Delay
Applied
Voltage
Tripping times (s)
EXPECTED
Admissible
27P
VI
DEFINITE
TIME
50 V
2
55 V
NO TRIP
NA
45 V
2.000 sec
[2.000 – 2.100]
GENERAL SETTINGS
Auxiliary Voltage
VX
AUXILIARY UV (27X)
Function
ENABLED
Pickup Level
50 V
Curve
DEFINITE TIME
Delay
2.00 sec
Element
Input
Curve
Pickup
Level
Delay
Applied
Voltage
Tripping time (s)
EXPECTED
Admissible
27X
VX
DEFINITE
TIME
50 V
2
55 V
NO TRIP
NA
45 V
2.000 sec
[2.000 – 2.100]
Summary of Contents for F650
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