GE Multilin 850 Instruction Manual page 355

CHAPTER 4: SETPOINTS
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
Secondly, this angle can also be used to eliminate the angular errors of the voltage
transformer and/or current transformers (CT); measured phase angle deviations caused
by measuring inaccuracy of voltage transformers, can be eliminated by properly setting
this value.
Y0 REACH
Range: 0.00 to 500.00 mS in steps of 0.01 mS
Default: 1.00 mS
This setting defines the reach of neutral admittance based protection criterion. Neutral
Admittance Ground Fault protection will operate after the set Pickup Delay time when
the neutral admittance quantity, Y0, exceeds this reach level. Regardless of the Direction
setting, this element always operates in the non-directional mode. Operating
characteristic depends only on the pick-up threshold defined by this setting.
G0 FWD REACH
Range: -500.00 to 500.00 mS in steps of 0.01 mS
Default: 1.00 mS
This setting defines the pickup level of protection criterion based on the neutral
conductance. Neutral Admittance Ground Fault protection will operate after the set
Pickup Delay time when the neutral conductance quantity, G0, exceeds the reach level
defined by this setting. This setting is not applicable when the Direction setting is set to
Reverse.
jB
Y0'
Y0
jB
Operate
Y0
Block
PROTECTION
Y0"
G
G
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