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Reclose Function
Does anyone have a practical plan for testing the reclose function? I have used amp buckets run through the the breaker to the current input so that the fault current is present as soon as the breaker recloses but this is not always convenient.
gcerniglia
Are you talking about a recloser relay connected to a breaker or an all-in-one recloser unit with no available secondary current inputs to the control system?
Chris
For example the reclose function on an SEL 351, or SR 750. The issue has been how to maintain current to simulate the fault as the simulation of the breaker goes through the reclose scheme. If the current stays on after the trip then the relays thinks there was a breaker failure and will not reclose. If the current is not immediately available when the breaker closes then the fault is not seen and the relay will reset.
gcerniglia
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Basler BE1-50BF Breaker Failure Relay Testing
You need to create multiple fault states with some method to transfer between states. The most important part is the breaker status contact. I always reclose the actual breaker instead of simulating it because breaker status timing is very important and sometimes a simulated contact works for testing but it doesn’t work in-service due to breaker open/close times.
My test set make it easy to do this test manually. Connect the relay’s trip contact to test set input 1 and close contact to test set input 2 (for this example). Make two or three states. State 1 is normal conditions with breaker close or just breaker closed with test set off. State 2 is is a reclose initiate fault (A phase overcurrent for example). State 3 is normal conditions with breaker open. Set your test set to switch from state 2 to state 3 and start a timer when input 1 operates. Set the test set to stop or go to state 1 with normal operating conditions and stop timer when input 2 operates.
Test procedure
1. Close breaker and apply State 1. Normal conditions are applied.
2. Wait for Lockout indication to change to ready
3. Manually start State 2 or setup timer to start state 2 after a preset time delay. A fault is now applied
4. Relay trips Input 1, breaker opens, test set automatically starts timer and state 3 is applied. Normal conditions with breaker open.
5. Relay closes Input 2, timer stops, breaker closes, test set generates state 1 or is off.
6. Record shot time delay. Repeat 3-5 for shot 2
7. Repeat 3-6 for additional shots.
You can also create a large number of states with timers and just have the test set cycle thro of the states depending on inputs and timers. You can also test reclose block conditions by changing voltages or status’ in stage 3. You can also check that the relay will reclose for some conditions but won’t on others by changing state 2 from a 1 phase to a 3 phase fault for example.
Thanks, you are most likely using an Omicron. I used to use one and setting up the state sequencer is not bad but now I am using a Doble 6150 which, as far as I can tell, is not as user friendly for creating such a sequence.
I’m using a Manta MTS-5000. I know pro-test has a state sequencer but it’s pretty clunky.
Thanks for the info. We also use the Enoserv RTS for most of the relays and might be able to build a generic reclose test with variables for number of steps and time delays.
I believe RTS has a new product called Vector that does state simulations. Most people I talk to with RTS say that it doesn’t test reclosers but I have no personal experience.