Hydraulic Reclosers timing 2

[TransformerGuy]

Can anybody tell me the minimum time between trips to allow the timing units to reset before restarting a test? Using a McGraw-Edison "R" type recloser.

 

[apowerengr]

Cooper's design duty cycle is 2 cycles standard (4 cycles with the special optional reclosing time).

 

[stevenal]

4 cycles sounds sound pretty short for a reset time. Most instruction books and service bulletins can be found here after registering:

http://www.cooperpowercentral.com/Login.aspx?ReturnUrl=/Default.aspx

 

[TransformerGuy]

Thanks for your thoughts fellas, but what I was looking for was the time for the pump to reset after each trip. I have since found out that it is 90 seconds per trip, or if it makes it all the way to lockout it would be ready to retest immediately. Thanks again.

 

[SHR1969]

It has been a long time since I tested OCR's (about 20 years ago). I went back and looked it up in an old McGraw Edison book. They say it should take approximately 1 minute per operation to reset. Therefore, after one shot it should take 1 minute to reset. If you went two shots it should take 2 minutes etc. There are a couple of variables. The older the recloser, probably the more wear on the trip piston, which means the oil can "leak" around the piston for a faster reset. If the oil is cold it leaks slower and thus a longer reset. If you got to lock out the reset is fast because there is a hole that allows the oil out from under the trip piston. Hope this helps. By the way, the electronic reclosers have programmable reset times that go from 0 to 180 seconds.