GE Multilin 850

CHAPTER 4: SETPOINTS CONTROL
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–323
Figure 4-145: Current based Pole Discordance detection logic (C)
894184A1.cdr
AND
FLEXLOGIC OPERAND
PD1-A Fail to Cls
AND
FLEXLOGIC OPERAND
PD1-B Fail to Cls
AND
FLEXLOGIC OPERAND
PD1-C Fail to Cls
AND AND ANDAND AND AND AND AND AND
OR
RUN
Ph A current
Ph B current
Ph C current
Phase Currents
AND AND
AND
AND AND AND
AND AND AND AND AND AND
AND
OR
Check for open
poles
Check for closed
poles
BRK Trip Trigger
BRK Close Trigger
AND
OR
OR OR OR
FLEXLOGIC OPERAND
PD1-A Fail to Open
FLEXLOGIC OPERAND
PD1-B Fail to Open
FLEXLOGIC OPERAND
PD1-C Fail to Open
OR OR OR
SETPOINT
PICKUP:
Ia ³ Pickup
Ib ³ Pickup
Ic ³ Pickup
Ia ³ Pickup
Ib ³ Pickup
Ic ³ Pickup
Ia ³ Pickup
Ib ³ Pickup
Ic ³ Pickup
Ia ³ Pickup
Ib ³ Pickup
Ic ³ Pickup
Ia ³ Pickup
Ib ³ Pickup
Ic ³ Pickup
Ia ³ Pickup
Ib ³ Pickup
Ic ³ Pickup
SETPOINT
PICKUP:
Ia < Pickup
Ib < Pickup
Ic < Pickup
Ia < Pickup
Ib < Pickup
Ic < Pickup
Ia < Pickup
Ib < Pickup
Ic < Pickup
Ia < Pickup
Ib < Pickup
Ic < Pickup
Ia < Pickup
Ib < Pickup
Ic < Pickup
Ia < Pickup
Ib < Pickup
Ic < Pickup
To Pole Discordance:
Breaker pole Failure
operands
(D)
To Pole Discordance:
Breaker pole Failure
operands ( D)
From Pole Discordance
Detection - Main logic
(A)
From Pole
Discordance
Detection - Main
logic ( )
Pole Discordance operation
From Pole Discordance
detection - main logic
(A)
To Pole Discordance
detection - main logic
(A)
Current Based PD detection
A