CHAPTER 6: SETPOINTS S3 PROTECTION
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 6–81
Negative sequence overvoltage (59_2)
The relay has one Negative Sequence Overvoltage element. The negative sequence
overvoltage may be used to detect the loss of one, or two phases of the source, a reversed
voltage phase sequence, or non-system voltage conditions.
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to Chapter 3 - Working with the Keypad.
PATH:
SETPOINTS > S3 PROTECTION > NEGATIVE SEQ OV
NEG SEQ OV FUNCTION
Range: Disabled, Alarm, Latched Alarm, Trip
Default: Disabled
For details see Common setpoints
.
NEG SEQ OV PKP
Range: 0.00 to 1.25 x VT in steps of 0.01
Default: 0.30 x VT
This setting defines the negative sequence OV pickup level.
NEG SEQ OV DELAY
Range: 0.00 to 600.00 sec in steps of 0.01 sec
Default: 2.00 s
This setting specifies the time delay before OV operation.
OUTPUT RELAY X
For details see Common setpoints
.
BLOCK 1/2/3
For details see Common setpoints
.
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