20
SYNC (Synchronizing) RELAY Test Screen:
The SYNCH RELAY Test Screen is used to test synchronizing and sync check relays. It
may also be used to test reverse phase, or phase sequence voltage relays, which can
be tested using an Open-Delta test potential (see
Testing Phase Sequence
Undervoltage Relays
). The two voltage sources used to test synchronizing type relays
are the
230 V / 4 A
CURRENT MAIN
output terminal, with common, and the
AC AUX,
300 V / 0.25 A
output terminals. The measured voltages are labeled
(M)
for the
230 V
CURRENT MAIN
and
(AUX)
for the
AC AUX
output. The DC VOLTS and Timer
displays are the same as the OVERCURRENT RELAY descriptions. The phase angle
between the two voltages is displayed as
φ
Vm lags V
, where
Vm
is the
(M)
output and
the other voltage
V
is from the
AC AUX
output. Consider how you connect the outputs
to the relay. If you want a voltage to lead another by a certain phase angle, consider
connecting the AC AUX output as the leading voltage, since the voltage from the MAIN
lags the voltage from the AC AUX.
Содержание SR-98
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