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This is a great time of the year to head back to Vancouver, I lived in Williams Lake for 7 years and the spring is great in BC. I hope to semi retire to British Columbia ar Alberta in 5 years or so. When I retire I am hoping to use my Electrical experience to work in interesting places on a...

Thanks for the help Waross, We checked the main 600 VAC systems out using the ground resistor and found 8 seperate auto transformers that someone had added a Y point ground. These grounds were removed and the DSP MKII works perfectly. Thanks again for your support. Jim

Thanks again for your input, just to clarify who I am. I am an Electrican with 25 years experience, working in central Ontario. Several unsucessful attempts have been made to find this problem, I have been tasked with finding the solution. I agree with this approach to finding the solution...

"Do you have a neutral carried out to the panels and 347 volt loads?" No there is no neutral, the main transformer is a 600 volt “Y” secondary, the neutral is wired directly into a 69 ohm resistor this in turn is wired directly to the ground grid. - All of the 347 loads are on isolation...

The 69 ohm ground resistor was replaced, The transformer was tested, including draining oil to inspect the condition of the insulators on the 3 phases and the neutral. The Current readings were done through at the ground resistor with a true RMS clamp on meter, this meter was also used on the...

I agree totally with rbulsara, It is critical to record those parameters. If not you could see increases or decreases in your readings. Jim Jimmmer Jim

I am trying to resolve a problem with and FPE switchgear system. The system is a high resistance grounded 3 phase delta Y. 600 / 347 VAC, the resister is sized to limit the ground current to 5 amps. We have a DSP MKII ground fault protection system that has worked great for 15 years. For the...