CHAPTER 6: SETPOINTS S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–99
Figure 6-43: Wattmetric ground fault logic diagram
Directional power (32)
The Directional Power element responds to three-phase directional power and is designed
for reverse power (32REV) and low forward power (32FWD) applications for synchronous
machines or interconnections involving co-generation. The relay measures the three-
phase power from either a full set of wye-connected VTs or a full-set of delta-connected
VTs. In the latter case, the two-wattmeter method is used. The function has two
independent elements; typically one element is used for alarming and the other stage for
tripping.
SETP OINT
=Disabled
=Alarm
FUNCTION
= Latched Alarm
=Control
=T r ip
LED: ALARM
OR
Vo l a t i l e ,
Re s e t - do mi n a n t
Latch
S
R
AND
AND
RESET
Command
AND
LED:T RIP
Operate Output
Relay 1 (TRIP)
Trip
(to BreakerFailure)
OR
SETP OINTS
=On
BLOCK 1:
=On
BLOCK 2:
=On
BLOCK 3:
OR
AND
SETP OINT
RU N
PO W ER P IC K UP :
S
op
= Re{V
n
·(I
n
· 1ECA°)*}
SETP OINTS
CURRENT:
Calculated In or
Measured Ig
VOLTAGE:
Calculated Vn or
MeasuredVx
SETP OINTS
RU N
PO W ER P IC K UP :
S
op
>PKP
RU N
VOLTAGE PICKUP:
V
MAG
>PKP
RU N
CURRENT PICKUP:
I
MAG
>PKP
AND
SETP OINT
PO W ER P IC K UP D E LA Y:
0
T
PKP
SETP OINTS
RU N
MULTIPLIER:
CURVE:
REF POWER PICKUP:
SETP OINTS
OUTPUT RELAY X
Do Not Operate, Operate
LED: PICKUP
Message
Event Recorder
Tran sient Recor de r
Message
Event Recorder
Tran sient Recor de r
898857A1.cdr
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