Insulation Rating of Neutral

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Dennis Alwon

Dennis Alwon

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Can anyone explain why the minimum insulation level for neutral conductors of a 1KV & over solidly grounded neutral system needs to only be 600 V?

Also I see a solidly grounded system is connected to ground without inserting resistor or impedance devices. Is that a standard system? If not where does this come into place or where does it not come into play?
 
Dennis, click here for an old discussion that is somewhat relevant.

Roger
 
Dennis Alwon said:
Does anyone know of where an impedance ground would be used and why it is used.
Click to expand...
As in the other thread, one good use of an impedance ground is it's a good way to prevent generator winding damage in the case of a hard fault.

The neutral is only in place for a fault (and maybe metering) so on a solidly grounded system or on the grounded side of the resistor there is no reason to use a MV insulation.

Roger
 
roger said:
As in the other thread, one good use of an impedance ground is it's a good way to prevent generator winding damage in the case of a hard fault.
Click to expand...
Ok I get this

The neutral is only in place for a fault (and maybe metering) so on a solidly grounded system or on the grounded side of the resistor there is no reason to use a MV insulation.

Roger
Click to expand...

The first part states the neutral is in place for a fault and maybe meter monitoring--Is that still talking about impedance ground? I guess I am confused by this sentence. It seems to talk about solidly grounding and impedance ground as the same. I am sorry- I am dense with this stuff.
 
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