898017A4.cdr
Zero Sequence Voltage(-V0)
SETPOINT
NTRL DIR FUNCTION:
Disabled = 0
Latched Alarm
SETPOINT
NTRL DIR BLOCK 1:
Off = 0
NTRL DIR BLOCK 2:
Off = 0
NTRL DIR BLOCK 3:
Off = 0
OR
LED: ALARM
NTRL DIR REVERSE
(To Neutral TOC and Neutral IOC )
Alarm
OR
OR
REVERSE
(Message)
AND
AND
RESET
Command
SETPOINT:
Do Not Operate, Operate
OUTPUT RELAY X
Control
OR
Neutral Current (In)
Ground current (Ig)
Voltage Polarization
-3V_0
3I_0
FWD
REV
REV
RUN
SETPOINT
NTRL DIR MTA
Current Polarization
REV
RUN
SETPOINT
NTRL DIR POLARIZING:
Voltage
Dual
Current
OR OR
SETPOINT
MIN POL VOLTAGE:
|V0| >MINIMUM
AND
Ig > 0.05 x CT
AND
In > 0.05 x CT
AND
OR
XOR
AND
Ntrl Dir Reverse
BLK NTRL DIR OC UND
(To Neutral TOC and Neutral IOC
)
SETPOINT
BLK NOC DIR UNDEF
Enabled
AND
AND
AND
OR
AND
(To Neutral TOC and Neutral IOC )
FORWARD
( * ) Polarizing voltage will be 3V0 when voltage is measured from the auxiliary voltage channel
(Message)
(Flexlogic)
(Event Recorder , Trasient
Recorder )
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