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vinsue
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Join Date: Jun 2011
Posts: 21

Common ESD Trip

06/18/2013 3:53 AM

Hi friends, please can someone enlighten me with a solution to this. I am having a 6.6 kV switchgear with 2 incomer feeders with bus section and 4 nos outgoing motor feeders all circuit breaker controlled (2 motors on each side of the bus section). There is a requirement to trip all the motors with one common ESD push button and I need to know how to wire this ESD pushbutton to all the motor feeders. Thanks in advance for your valued suggestion.
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Pattabhiraman
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Join Date: May 2013
Posts: 86
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#1

Re: Common ESD trip

06/18/2013 5:18 AM

If your breakers are fitted with shunt trip coils, then, Use a emergency push button with 4 nos. potential free normally open contacts of suitable current make and carry rating. Each of the potential free contact should be wired to trip respective motor master trip relay ( in parallel with existing trip initiating contacts ), which in turn will trip the breaker through its shunt trip coil. If your breakers are fitted with no volt coils, then, Use a emergency push button with 4 nos. potential free normally closed contacts of suitable current break rating. Each of the potential free contact should be wired ( in series ) to interlocking logic circuit for permitting the no volt coil to latch and allow the breaker to close. Among the two options, building logic with no volt coil is preferable. Care should be taken that the control wiring amongst the breakers are not intermingled. Please take the help of a qualified electrical wire man for carrying out this modification.
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TonyS
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#2

Re: Common ESD Trip

06/18/2013 8:39 AM

If you don't know how to put this simple circuit together I really don't think you should be anywhere near 6.6KV switchgear.

As this is an emergency stop a relay or some device should de-latch to prevent the motors from being restarted.

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lyn
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Join Date: Oct 2008
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#3
In reply to #2

Re: What I Should Have Learned in School, But Didn't

06/18/2013 8:46 AM

This joker seems to be a threat to society. Apparently he does come here and ask how to do these things before he charges in and blows things up. So far.

Hopefully, someday he'll go to school.


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ramvinod
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#4

Re: Common ESD Trip

06/19/2013 2:45 AM

I can help you. Please send the control wiring diagram of one motor circuit feeder. I can mark in the diagram and submit to you so that you can incorporate in the panel.

Some one suggested the no volt coil. Generally there will not be any no volt coil on 6.6 kV switch gear. However no volt coil will be available in LT Switch gear.

It is preferable to use one push to lock push button with 4 individual NO Contact block.

It should be wired such a way that master trip relay picks up when push button is actuated. In turn master trip relay will trip the breaker

It is not advisable to actuate Switchgear Trip coil through push button element as the NO contact of Pushbutton element may not be able carry the current and over a period of time contact block will get damaged.

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Pattabhiraman
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Join Date: May 2013
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#6
In reply to #4

Re: Common ESD Trip

06/19/2013 5:57 AM

Please do not skim read and answer. All points mentioned by you are covered in my reply, albeit qualified with "if", "suitable" etc.
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ramvinod
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#9
In reply to #6

Re: Common ESD Trip

06/19/2013 10:53 PM

Dear sir

It is not my intention to comment on other's answer. In the interest of the subject and helping the poster I have answered.

If I had hurt you, I am sorry for this.

ramesh

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vinsue
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#7
In reply to #4

Re: Common ESD Trip

06/19/2013 7:41 AM

Thanks Ramesh and Pattabhi for your valued response, please find attached the control wiring of one motor feeder wherin I have marked within the cloud. Please advise, it shall be NC contact instead of NO contact.
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ramvinod
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#10
In reply to #7

Re: Common ESD Trip

06/19/2013 10:55 PM

The sketch is not readable.

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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#5

Re: Common ESD Trip

06/19/2013 3:33 AM

Are the equipment manufacturer's "as-built" drawings unavailable for some reason?

Is the equipment manufacturer's telephone number unavailable for some reason?

Are local electrical engineering companies' telephone numbers unavailable for some reason?

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lyn
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#8

Re: Common ESD Trip

06/19/2013 5:27 PM

"Please advise, it shall be NC contact instead of NO contact."

I rest my case.

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