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ANANDANRCR
Active Contributor

Join Date: Mar 2014
Posts: 19

6.6-kV 1300-kW VPI HT Motor Failure

12/31/2016 12:51 AM

We have installed 1300 kW, 1400 RPM, 6.6 kV motor, manufactured in the year 2010 was installed in our plant. This motor has failed recently. The B Phase winding has puncthured in Two bars in the winding slot.

Please advice me to go ahead with repairs

1. whether to go for Full winding replacement as it is a VPI motor and it requires for VPI process.

OR

2. To get the entire winding replaced by RESIN RICH WINDINGS which is cheaper.

3. Experts, Please suggest me the best possible way to repair the motor as per the present trends for repairing of HT Motors.
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Andrew Westman
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#1

Re: 6.6 kV 1300 kW VPI HT Motor Failure

12/31/2016 1:34 AM

What does the motor manufacturer recommend?
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ANANDANRCR
Active Contributor

Join Date: Mar 2014
Posts: 19
#4
In reply to #1

Re: 6.6 kV 1300 kW VPI HT Motor Failure

12/31/2016 4:53 AM

They have not responded properly. This has Class "F" Insulation.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
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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#9
In reply to #4

Re: 6.6 kV 1300 kW VPI HT Motor Failure

01/03/2017 3:28 AM

Please explain how the motor manufacturer is unable to respond to telephone calls?

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lyn
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Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#10
In reply to #9

Re: 6.6 kV 1300 kW VPI HT Motor Failure

01/03/2017 12:43 PM

One receives instant gratification [although often incorrect, if not lethal] from the internet.

The telephone requires patience, and even sufficient information for an informed response, that most have lost.

Even remotely engaging in a person to person interchange has fallen out of vogue.
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7anoter4
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#2

Re: 6.6 kV 1300 kW VPI HT Motor Failure

12/31/2016 2:42 AM

I cannot indicate how to repair it. It depends also on your budgetary possibility.

In my opinion, you have to keep at least the insulation class.

However, one has to check the cause of the failure and eliminate it-if possibly

A spike of a transient voltage or overloading or else.

If the insulation was good for 6 years it is hard to say it is a manufacturing defect involved.

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ANANDANRCR
Active Contributor

Join Date: Mar 2014
Posts: 19
#3

Re: 6.6 kV 1300 kW VPI HT Motor Failure

12/31/2016 4:51 AM

Thanks for reply this 1300 kW HT motor has CLASS "F" Insulation
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lyn
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Join Date: Oct 2008
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#5

Re: 6.6 kV 1300 kW VPI HT Motor Failure

12/31/2016 10:18 AM

Why did it fail?

What does the manufacturer recommend?

If you want the motor to last as long as a new one, go with option #1.

Replace the bearings also.
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ANANDANRCR
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Join Date: Mar 2014
Posts: 19
#8
In reply to #5

Re: 6.6 kV 1300 kW VPI HT Motor Failure

01/01/2017 4:11 AM

Thanks for reply..
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7anoter4
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#6

Re: 6.6 kV 1300 kW VPI HT Motor Failure

12/31/2016 11:59 PM

See-for instance:

https://www.scribd.com/doc/53263154/Comparison-of-VPI-and-Resin-Rich-insulation-systems

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dhayanandhan
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Engineering Fields - Mechanical Engineering - New Member

Join Date: May 2008
Location: CHENNAI, TAMIL NADU, INDIA.
Posts: 1851
Good Answers: 65
#7

Re: 6.6 kV 1300 kW VPI HT Motor Failure

01/01/2017 3:51 AM

Dear Mr. AnandanCR,

In my opinion - you have to send the motor to the Manufacturer and the particular bar (where it has failed) in the stator and adjacent bars have to be removed and re-do the job, and test the motor.

We have done this type of repair some time back and it worked nicely

Whether it is free of cost or chargeable is a commercial matter to be discussed and decided by you.

DHAYANANDHAN.S
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Users who posted comments:

7anoter4 (2); ANANDANRCR (3); Andrew Westman (1); dhayanandhan (1); lyn (2); PWSlack (1)

Previous in Forum: Voltage Induction in Control Cable by Adjacent Power Cable   Next in Forum: Contactor for DOL Starter with PF Capacitor

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