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

6.16 FREQUENCY ELEMENTS (81O/81U)

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
81U VII
81 O VII
6
6-24
GENERAL SETTINGS
Nominal Frequency
ELEMENT SETTINGS
FREQUENCY (81)
Function
Pickup Level
Trip Delay
Reset Delay
Minimum Voltage
TRIP DELAY
(HZ) (SECONDS)
47.5 2
52.5 2
F650 Digital Bay Controller
50 Hz
81U 81O
ENABLED ENABLED
47.50 Hz 52.50 Hz
2.00 sec 2.00 sec
0.00 sec 0.00 sec
30 V 30 V
APPLIED FREQUENCY
VOLTAGE (V) THRESHOLDS
80 48 Hz
46 Hz
25 46 Hz
80 52 Hz
54 Hz
25 54 Hz
6 COMMISSIONING
TRIPPING TIME (S)
EXPECTED ADMISSIBLE
No trip NA
2 [1.9 -2.1]
No trip NA
No trip NA
2 [1.9 –2.1]
No trip NA
GEK-113000AE