GE 750 Instruction Manual page 172

750/760 S6 Monitoring
Feeder Management Relay
996710A1.CDR
FIGURE 5–38: Capacitor Bank Switching
Two independent elements are available for monitoring power factor, each having a
pickup and a dropout level. For each element, when the measured power factor
becomes more lagging than the pickup level (i.e. numerically less than), the relay
operates a user-selected output contact. This output can be used to control a
switching device which connects capacitance to the circuit, or to signal an alarm to
the system operator. After entering this state, when the power factor becomes less
lagging than the power factor dropout level for a time larger than the set delay, the
relay will reset the output contact to the non-operated state.
The power factor feature is inhibited from operating unless all three voltages are
above 30% of nominal and one or more currents is above 0. Power Factor 1 and 2
delay timers will only be allowed to time when the 30% threshold is exceeded on all
phases and the power factor remains outside of the programmed pickup and
dropout levels. In the same way, when a power factor condition starts the Power
Factor 1 or 2 delay timer, if all three phase voltages fall below the 30% threshold
before the timer has timed-out, the element will reset without operating. A loss of
voltage during any state will return both Power Factor 1 and 2 to the reset state.
For the and setpoints, positive values
PWR FACTOR 1(2) PICKUP PWR FACTOR 1(2) DROPOUT
indicate lagging power factor.
GE Multilin
5–76
http://www.GEmultilin.com