Figure 78 Reclose Only, 4-Shot Reclose Timing Test
The following graphic displays the reclose contacts, the breaker simulator contacts and the delay
time between contact operations for Reclose Only relays.
Trip & Reclose Relays
Some of the new distribution protection relays require an AC current to simulate an overcurrent
condition, as well as circuit breaker simulation for the reclose operation (Trip and Reclose). In
this case, as well as the electronic (ME) recloser, two tests are normally performed. One test is
the pickup test, or minimum operation point. This test is performed same as the Overcurrent
Pickup Test. The other is a timing test. For testing the trip and reclose relays, the timing test
involves applying a fault current, measure the trip time, record the trip time, simulating a circuit
breaker opening and measure the time for the reclosing contacts to operate. Upon initiating the
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