GE G60 Instruction Manual page 398

5.6 GROUPED ELEMENTS
By making the characteristic angle adjustable and providing for both negative and positive values of the minimum operating
power a variety of operating characteristics can be achieved as presented in the figure below. For example, section (a) in
the figure below shows settings for reverse power, while section (b) shows settings for low forward power applications.
5
Figure 5–126: DIRECTIONAL POWER ELEMENT SAMPLE APPLICATIONS
5-238
SMIN
RESTRAIN
Figure 5–125: DIRECTIONAL POWER CHARACTERISTIC
(a)
Q
OPERATE RESTRAIN
P
RCA = 180 o
SMIN > 0
(c)
Q
OPERATE
P
RESTRAIN
o
RCA = 0
SMIN < 0
(e)
Q
OPERATE
RESTRAIN
P
o
RCA = 90
SMIN > 0
842702A1.CDR
G60 Generator Protection System
Q
OPERATE
RCA+
CALIBRATION
P
+
-
(b)
Q
OPERATE
(d)
Q
RESTRAIN
(f)
Q
RESTRAIN
OPERATE
5 SETTINGS
RESTRAIN
P
RCA = 180 o
SMIN < 0
OPERATE
P
o
RCA = 0
SMIN > 0
P
o
RCA = 270
SMIN < 0
GE Multilin