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Anonymous Poster #1

Discrepancy Circuit Breaker

06/29/2017 3:08 PM

Hi,

We have a 220kv circuit breaker SIEMENS 3AQ1E. We want to know what is the max time of discrepancy. We don't have the initial protocol. In some text says 1/4 cycle and other 1/6 cycle, but we need to find standard that applies.

Thanks in advance...

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#1

Re: Discrepancy circuit breaker

06/29/2017 3:42 PM
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#2

Re: Discrepancy Circuit Breaker

06/29/2017 4:46 PM

Please define the mysterious terms "max time of discrepancy" and "initial protocol"; please avoid buzzwords.

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#5
In reply to #2

Re: Discrepancy Circuit Breaker

06/30/2017 8:29 AM

OP is looking for the maximum time differential allowed between pole contacts on opening or closing the breaker. This may be a 2- or 3-cycle operation (overall) breaker, but allowable difference between phase contacts opening or closing may be in the 2 to 6 millisecond range. Only the Mfr can tell you for sure what is allowed, which is why the OP is looking for the Installation and Maintenance Manual ('initial protocol").

A call to Siemens Energy is what is needed - they will be able to help. If the OP doesn't have a local (to him) Siemens number, I'm sure contact can be made through their web site:

https://www.siemens.com/global/en/home/products/energy/high-voltage.html

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#6
In reply to #5

Re: Discrepancy Circuit Breaker

06/30/2017 9:33 AM

...as in 4⇓.

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#9
In reply to #5

Re: Discrepancy Circuit Breaker

03/06/2021 6:39 AM

You were right and your comments were the that the standard said...

I want to say thanks for your valuable words... That's what the community need.

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#3

Re: Discrepancy Circuit Breaker

06/29/2017 5:06 PM

Contact these people, they have your breaker listed. If that costs too much contact Siemens directly, they're also on the web.

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#4

Re: Discrepancy Circuit Breaker

06/30/2017 3:48 AM

A simple telephone call to Siemens would be worth far more than an interminable wait here.

"Make it so!" - "Jean-Luc Picard".

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Anonymous Poster #1
#7
In reply to #4

Re: Discrepancy Circuit Breaker

06/30/2017 12:11 PM

That's not rigth we've been waiting for 6 weeks and here only takes 1 day... But thanks.

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#8
In reply to #7

Re: Discrepancy Circuit Breaker

06/30/2017 3:49 PM

Nonsense. It doesn't take six weeks to make a telephone call.

It might take six weeks to get no-one to reply to an e-mail - that's different: email is no longer a suitable medium for collaborative business working, which is why no-one relies on it any more.

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#10

Re: Discrepancy Circuit Breaker

03/08/2021 12:39 AM

IEC 62271-100 has a clause that discusses ''simultaneity'' in operation of CB poles.

It states 1/4th cycle in closing operation and 1/6th cycle in opening operation shall be the maximum discrepancy in the operation of individual poles of the CB.

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