GE G30 Instruction Manual page 350

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
5-210
RESTRAIN
Figure 5–94: DIRECTIONAL POWER CHARACTERISTIC
(a)
Q
OPERATE RESTRAIN
RCA = 180
SMIN > 0
(c)
Q
OPERATE
RESTRAIN
o
RCA = 0
SMIN < 0
(e)
Q
OPERATE
RESTRAIN
o
RCA = 90
SMIN > 0
842702A1.CDR
Figure 5–95: DIRECTIONAL POWER ELEMENT SAMPLE APPLICATIONS
G30 Generator Protection System
Q
OPERATE
RCA+
CALIBRATION
SMIN
P
+
-
(b)
Q
OPERATE
P
o
(d)
Q
P
RESTRAIN
(f)
Q
P
5 SETTINGS
RESTRAIN
P
RCA = 180 o
SMIN < 0
OPERATE
P
o
RCA = 0
SMIN > 0
RESTRAIN
OPERATE
P
o
RCA = 270
SMIN < 0
GE Multilin