Joined
·
2,048 Posts
When a large breaker goes trip free do the mains close and then immediately open or try to close but not make then return to the open position. It happens so fast I can't tell
Thanks LC
Thanks LC
Just curious, what kind of work do you do Lone Crapshooter? I am apprenticing doing service and pm on the large draw out breakers and power distribution equipment. I got to work on a line up of 5kV magna blasts in the summer... you definitely know when they open :thumbup:These are not residential breakers. They are draw out power breakers like Eaton VCPW, DS, GE Manga blast, AK and the like.
what kind of factory is it? Oil refinery, steel mill?I work in a in plant electrical distribution department. I have seen many breakers go trip free when doing RM but never had a good understanding what was going on when the breaker goes trip free.
They can, depending on how it is being used, but in most cases the contacts are allowed to touch, then re-open. In fact it's required in cases where the 52a contacts are used to energize the trip coil. The only prohibition is that if you are holding the Trip command button manually, and a Close command is given, the main contacts are not allowed to touch. Makes sense if you think about it, you would piss your pants if the contacts closed into a fault that you KNEW was there and that's why you were holding the Trip button!When a large breaker goes trip free do the mains close and then immediately open or try to close but not make then return to the open position. It happens so fast I can't tell
Thanks LC
Exactly. Thats the anti pump (Y) relay doing its job. :thumbup:They can, depending on how it is being used, but in most cases the contacts are allowed to touch, then re-open. In fact it's required in cases where the 52a contacts are used to energize the trip coil. The only prohibition is that if you are holding the Trip command button manually, and a Close command is given, the main contacts are not allowed to touch. Makes sense if you think about it, you would piss your pants if the contacts closed into a fault that you KNEW was there and that's why you were holding the Trip button!
This is outlined in ANSI C37.04 by the way.
Which one? While they all are designed to the same ANSI requirements they each acomplish this differently. Generally you either have a trip signal or something was not reset or you have an adjustment issue. If neither one of those is the cause you likely have worn or damaged parts in the mech, these breakers are designed with refirbishment in mind (Time or # of operations in tech manual). Wearable parts need replacement every now and then.These are not residential breakers. They are draw out power breakers like Eaton VCPW, DS, GE Manga blast, AK and the like.