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Power-User

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Location: Hyderabad
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Generator Inter-turn Protection

02/26/2020 4:58 AM

Does any one specify Inter-turn protection for generators and Synchronous motors, these days!

I know it used to be standard for all generators (especially large ones) in 1970's / 1980's.

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Raghunath
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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#1

Re: Generator Inter-turn protection

02/26/2020 5:31 AM

A good percentage of motors can be had these days with a temperature sensor embedded in the windings. The sensor can be connected to a device within the control arrangements for the motor that can trip the power on overtemperature, thereby adding protection for it and for persons in the vicinity.

Please discuss the specific detail with motor manufacturers directly.

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Guru

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#2

Re: Generator Inter-turn Protection

02/26/2020 11:17 PM

High Speed differential protection has been the standard for machines ~5MVA and higher since the 1970s. Motors and generators. Not sure what you mean for inter-turn protection?

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Power-User

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#3

Re: Generator Inter-turn Protection

03/02/2020 11:19 AM

Generators in the range of 100MW and above did not provide inter turn protection even in 1970 (I am referring to Turbo generators. May be Hydro generators specified this protection). Turbo generators in the range of 100 MW and above had bar type of winding in stator having single turn in each bar. The generator voltage in most cases was above 11KV. Though voltage between bar and earth was 11KV divided by under root 3. but each bar was insulated for full voltage of more than 11KV. There was practically no chance of inter turn fault. Any failure of insulation resulted in earth fault before resulting in inter turn fault.

The introduction of epoxy insulation (class F), altogether eliminated the chances of inter turn fault.

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Power-User

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#4
In reply to #3

Re: Generator Inter-turn Protection

03/02/2020 10:30 PM

Thanks Sir for sharing your knowledge and experience!! It is very helpful.

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Raghunath
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Guru

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#5
In reply to #4

Re: Generator Inter-turn Protection

03/03/2020 12:01 AM

No one yet has explained just how inter-turn protection might have been implemented, other than differential protection. I'm interested to learn...

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