GE 889 Instruction Manual page 269

CHAPTER 4: SETPOINTS
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CIRCLE 1 PICKUP DELAY
Range: 0.00 to 600.00 s in steps of 0.01 s
Default: 0.30 s
CIRCLE 1 UV SUPERVISION
Range: Disabled, Enabled
Default: Disabled
Under-voltage supervision of the element can be enabled or disabled. If Enabled for
Circle 1, the positive sequence voltage at the machine terminal should be lower than
setting value in "UV Supervision" in order to execute the Circle 1 impedance element, i.e.
LOE Circle 1 is enabled only in case voltage drops below the "UV supervision" level. This
additional check ensures the drop in generator terminal voltage in case of loss of
excitation.
CIRCLE 1 OUTPUT RELAY X
For details see Common
CIRCLE 2 FUNCTION
Range: Disabled, Trip, Alarm, Latched Alarm, Configurable
Default: Disabled
CIRCLE 2 DIAMETER
Range: 0.1 to 300.0 ohms in steps of 0.1 ohms
Default: 35.0 ohms
This setting is the diameter of the Circle 2 characteristic in ohms, referring to the CT/VT
secondary (relay).
CIRCLE 2 OFFSET
Range: 0.1 to 300.0 ohms in steps of 0.1 ohms
Default: 2.5 ohms
This setting is the offset of the Circle 2 characteristic in ohms, referring to the CT/VT
secondary (relay).
CIRCLE 2 PICKUP DELAY
Range: 0.00 to 600.00 s in steps of 0.01 s
Default: 1.00 s
CIRCLE 2 UV SUPERVISION
Range: Disabled, Enabled
Default: Disabled
Under-voltage supervision of the element can be enabled or disabled. If Enabled for
Circle 2, the positive sequence voltage at the machine terminal should be lower than
setting value in "UV Supervision" in order to execute the Circle 2 impedance element, i.e.
LOE Circle 1 is enabled only in case voltage drops below the "UV supervision" level. This
additional check ensures the drop in generator terminal voltage in case of loss of
excitation.
CIRCLE 2 OUTPUT RELAY X
For details see Common
UV SUPERVISION
Range: 0.00 to 1.50 x VT in steps of 0.01 x VT
Default: 0.70 x VT
This setting specifies the pickup value for under-voltage supervision for one or both
circles (if enabled).
Setpoints.
Setpoints.
PROTECTION
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