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CHAPTER 6: SETPOINTS
NOTE:
NOTE
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 6-48: Sample applications of the directional power element
(a)
Q
OPERATE
RESTRAIN
(c)
Q
RESTRAIN
(e)
Q
OPERATE
RESTRAIN
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
P
o
RCA = 180
SMIN > 0
OPERATE
P
o
RCA = 0
SMIN < 0
P
o
RCA = 90
SMIN > 0
setpoints.
S3 PROTECTION
(b)
Q
RESTRAIN
OPERATE
RCA = 180
SMIN < 0
(d)
Q
OPERATE
RESTRAIN
RCA = 0
SMIN > 0
(f)
Q
RESTRAIN
OPERATE
RCA = 270
SMIN < 0
898850A1.cdr
P
o
P
o
P
o
6–115
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