GE 339

CHAPTER 6: SETPOINTS S3 PROTECTION
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 6–115
Figure 6-48: Sample applications of the directional power element
NOTE
NOTE:
The element drops out if the magnitude of the positive-sequence current becomes
virtually zero, that is, it drops below 0.02 x CT. Such a condition is taken as an indication
that the protected equipment is disconnected.
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to Chapter 3 - Working with the Keypad.
PATH:
SETPOINTS > S3 PROTECTION > DIRECTIONAL POWER 1(2)
FUNCTION
Range: Disabled, Alarm, Latched Alarm, Trip, Control
Default: Disabled
For details see Common setpoints
.
P
Q
OPERATE
RESTRAIN
RCA = 0
o
SMIN > 0
(d)
P
Q
OPERATE RESTRAIN
RCA = 180
o
SMIN > 0
(a)
P
Q
OPERATE
RESTRAIN
RCA = 0
o
SMIN < 0
(c)
P
Q
OPERATE
RESTRAIN
RCA = 180
o
SMIN < 0
(b)
P
Q
OPERATE
RESTRAIN
RCA = 90
o
SMIN > 0
(e)
P
Q
OPERATE
RESTRAIN
RCA = 270
o
SMIN < 0
(f)
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