6–46
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CURRENT ELEMENTS
CHAPTER 6: PROTECTION SETPOINTS
Figure 6-16: Sensitive Ground Instantaneous Overcurrent Protection logic diagram
894040A2.cdr
SETPOINTS
Sensitive Ground current
(Isg)
RUN
SETPOINTS
BLOCK:
Of
f
= 0
PICKUP:
Isg > PICKUP
OR
AND
Operate Output Relay
1 (TRIP)
LED: TRIP
OR
OR
From Cold Load Pickup
From Sensitive Ground CT
AND
AND
SETPOINT
FUNCTION:
Disabled
= 0
T
rip
Alarm
Latched
Alarm
PICKUP
DELA
Y
:
SETPOINTS
t
PKP
From
Autoreclose
(per shot settings)
LED
: ALARM
RESET
Command
AND
S
R
LA
TCH
LED
: PICKUP
SETPOINTS
Do Not Operate,
Operate
OUTPUT
RELA
YS
3 to 7
DIRECTION:
DROPOUT
DELA
Y
:
t
RST
Configurable
SGnd IOC 1
PKP
FLEXLOGIC OPERANDS
SGnd IOC 1
OP
FLEXLOGIC OPERANDS
Direction (from Sens Ground
Directional OC element
)
Set
Dominant
From Manual Close
Blocking
Summary of Contents for Multilin 850
Page 10: ...VIII 850 FEEDER PROTECTION SYSTEM INSTRUCTION MANUAL ...
Page 135: ...CHAPTER 3 INTERFACES SOFTWARE INTERFACE 850 FEEDER PROTECTION SYSTEM INSTRUCTION MANUAL 3 41 ...
Page 151: ...CHAPTER 3 INTERFACES SOFTWARE INTERFACE 850 FEEDER PROTECTION SYSTEM INSTRUCTION MANUAL 3 57 ...
Page 153: ...CHAPTER 3 INTERFACES SOFTWARE INTERFACE 850 FEEDER PROTECTION SYSTEM INSTRUCTION MANUAL 3 59 ...
Page 439: ...CHAPTER 7 MONITORING FUNCTIONS 850 FEEDER PROTECTION SYSTEM INSTRUCTION MANUAL 7 19 ...
Page 644: ...11 20 850 FEEDER PROTECTION SYSTEM INSTRUCTION MANUAL FLEXELEMENTS CHAPTER 11 METERING ...