Frequency Elements (81O/81U) - GE F650 User Manual

CHAPTER 6: COMMISSIONING

6.16 Frequency elements (81O/81U)

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, modifying frequency from the maximum threshold (48 Hz) to the minimum (46 Hz)
for 81U, and from the minimum (52 Hz) to the maximum (54 Hz) for 81O, in steps of 10 mHz.
Verify that the relay trips at the set frequency in the corresponding element with an error of 3% ó ±50 mHz.
Apply a voltage that is lower than the "Minimum Voltage" setting, with a frequency under (81U) or over (81O) the setting,
and verify that the relay does not trip.
Elements Phase Pickup Level (Hz)
81U VII 47.5
81 O VII 52.5
GEK-113000-AF
GENERAL SETTINGS
Nominal Frequency 50 Hz
ELEMENT SETTINGS
FREQUENCY (81) 81U
Function ENABLED
Pickup Level 47.50 Hz
Trip Delay 2.00 sec
Reset Delay 0.00 sec
Minimum Voltage 30 V
Trip Delay Applied Voltage
(seconds) (V)
2 80
25
2 80
25
F650 DIGITAL BAY CONTROLLER
6.16 FREQUENCY ELEMENTS (81O/81U)
81O
ENABLED
52.50 Hz
2.00 sec
0.00 sec
30 V
Frequency Tripping Time (s)
Thresholds
EXPECTED
48 Hz No trip
46 Hz 2
46 Hz No trip
52 Hz No trip
54 Hz 2
54 Hz No trip
Admissible
NA
[1.9 -2.1]
NA
NA
[1.9 –2.1]
NA
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