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Anonymous Poster #1

Insulation Resistance Values

09/15/2017 1:59 AM

Hi,

What values of insulation resistance are acceptable in 132 side of equipments like:

1. Lightning arresters.

2. Capacitor voltage transformer.

3. current transformer.

4. 132 kV gas circuit breakers.

5. 132 kV isolators.

6. 132 kV bypass isolators.

Best Regards,

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#1

Re: insulation resistance values.

09/15/2017 3:09 AM

That would depend upon the organisation defining them.

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#2

Re: insulation resistance values.

09/15/2017 3:47 AM

The resistance is expected to be higher than the inductive or capacitive impedance of the wiring that follows.

Nevertheless, following regulations would be more advisable.

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#3

Re: Insulation Resistance Values.

09/15/2017 7:49 AM

Do your own homework

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#4

Re: Insulation Resistance Values.

09/15/2017 8:25 AM

42.

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#8
In reply to #4

Re: Insulation Resistance Values.

09/15/2017 11:33 AM

I was thinking √1764, but I am just weird that way.

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#5

Re: Insulation Resistance Values.

09/15/2017 9:47 AM

Large.

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#6

Re: Insulation Resistance Values.

09/15/2017 10:32 AM

The values that are specified by the equipment manufacturer(s), an electrical/commissioning engineer knowledgeable in such matters, and or those from the client who owns/operates the equipment.

This is not an exercise for handbook engineers since lives and equipment will be at great risk if not done properly.

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#7

Re: Insulation Resistance Values.

09/15/2017 11:32 AM

Hopefully the insulation resistance will not break down in the 132 kV environment nor promote corona, or arc-flash.

Follow your local rules and regulations, always.

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#9

Re: Insulation Resistance Values.

09/15/2017 11:22 PM

Infinite would be perfect.

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#10
In reply to #9

Re: Insulation Resistance Values.

09/22/2017 5:05 AM

Bad news for you: there is no such a thing that can be technically qualified as INFINITE in the real world.

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#11
In reply to #10

Re: Insulation Resistance Values.

09/22/2017 9:32 AM

Concepts do exist. Infinity is a very important concept and Deefburger is properly using it here. Infinity can never be measured and it is one of if not the most uncertain number known. For no matter how one attempts to quantify infinity, infinity is always bigger.

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#13
In reply to #11

Re: Insulation Resistance Values.

09/22/2017 9:55 AM

The relevant question: can you measure the difference between what you have in hand and infinity? I maintain, that it reaches a point where no practical difference exists, in solving the problem at hand.

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#12
In reply to #10

Re: Insulation Resistance Values.

09/22/2017 9:54 AM

That assertion only holds for pure scientists. All of use around here are multi-disciplinary (translation: we have been whipped and beaten by various torture instruments through all our schooling, until work hardened), and since this is an engineering forum, we can arrive at any such destination for all practical purposes.

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