GE N60 Instruction Manual page 303

CHAPTER 5: SETTINGS
(a)
OPERATE
(c)
RESTRAIN
(e)
842702A1.CDR
— Specifies the relay characteristic angle (RCA) for the sensitive directional power function. Application of
DIR POWER 1 RCA
this setting is threefold:
• It allows the element to respond to active or reactive power in any direction (active overpower/underpower, and so on)
• Together with a precise calibration angle, it allows compensation for any CT and VT angular errors to permit more
sensitive settings
• It allows for required direction in situations when the voltage signal is taken from behind a delta-wye connected
power transformer and the phase angle compensation is required
For example, the active overpower characteristic is achieved by setting
setting to "90°," active underpower by setting
DIR POWER 1 RCA
setting to "270°."
DIR POWER 1 RCA
— This setting allows the relay characteristic angle to change in steps of 0.05°. This is useful
DIR POWER 1 CALIBRATION
when a small difference in VT and CT angular errors is to be compensated to permit more sensitive settings. This setting
virtually enables calibration of the directional power function in terms of the angular error of applied VTs and CTs. The
element responds to the sum of the
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
Figure 5-90: Directional power element sample applications
Q
RESTRAIN
P
RCA = 180 o
SMIN > 0
Q
OPERATE
P
RCA = 0 o
SMIN < 0
Q
OPERATE
RESTRAIN
P
o
RCA = 90
SMIN > 0
and
DIR POWER 1 RCA DIR POWER 1 CALIBRATION
(b)
Q
RESTRAIN
OPERATE
RCA = 180
SMIN < 0
(d)
Q
OPERATE
RESTRAIN
RCA = 0
SMIN > 0
(f)
Q
RESTRAIN
OPERATE
RCA = 270
SMIN < 0
to "0°," reactive overpower by
DIR POWER 1 RCA
to "180°," and reactive underpower by
DIR POWER 1 RCA
settings.
GROUPED ELEMENTS
P
o
P
o
P
o
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5