3.5.6 Auto Synchronizing
Two voltage output modules are required to perform tests on synchronizing type relays. To
perform Pick-Up or Closing Angle tests, voltage channel one, V
1
, will be referenced at 0
°
and
allow the second voltage channel, V
2
, to provide the variable phase angle adjustment.
Remember the phase angle indicated on V
2
will be a lagging angle. If the relay’s closing
characteristic is 20
°
leading, set an angle of 340
°
on voltage channel 2.
0
V1
V2
-90
180
+90
Increase Phase of V2
Relay Contacts Close
Breaker Contacts Close
Auto Synchronizing Relay
3.5.7 Pickup
The pickup test performs a Ramp or Pulse Ramp (see 3.5.1 for description of Pulse Ramp).
Using the Ramp function, the relay is first energized using two times the Tap or Pickup value.
After the relay contacts close, the outputs are set to 90% of the Pickup value. The output is
increased until the relay trips. Once the relay trips the test stops and the output is recorded.
Pickup Test
43
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