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600v AWG8 CT control cable how high voltage AC can take?

600v AWG8 CT control cable how high voltage AC can take?

600v AWG8 CT control cable how high voltage AC can take?

(OP)
anybody out there saturating CT's from inside relay room? we have 600V AC CT cables and I was wondering how much cable insulation can take since Saturation tests go up to 1200V AC?
any comments?

RE: 600v AWG8 CT control cable how high voltage AC can take?

I did a demonstration for some students of the electrical trade. One of them posed the question as to the ultimate failure voltage of a 600-volt rated cable. I thin the specimen we used was #4 AWG. I put the non-shield cable on a steel table for the test and connected a DC hipot. I let the class place bets as to the breakdown voltage. Nobody suggested that it might be more than 10 kV, but I cranked the voltage in a slow ramp to almost 50 kV. Realize, of course, that this was not a laboratory-grade test, just a demonstration of a point.

On CT's driven to saturation, the common failure mode is for the overvoltage to find the weakest insulation in the system. I have seen a set of terminal blocks catch fire. I have seen the connection board on a GE relay drawout case arc over. I would not want to bet on what happens in any given system unless a specific installation of overvoltage protection such as arc-tubes or varistors are installed.

old field guy

RE: 600v AWG8 CT control cable how high voltage AC can take?

By 'saturation test' do you mean magnetising curve?

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