Ampmeters and CT Grounding

[mivey]

I can only assume they were not working on 135 to 345 KV transmission lines. With a 600:1 current ratio on 345KV, an open CT voltage rises to 207,000 KV in a pico second when opened with 1 to 10 amps capability through the arc flash in theory. That is one large explosion.

The open CTs I have encountered were on distribution systems.

I have never ran across one at the 46-230 kV level and I hope I never do. Failures at the MV level are ugly enough.

 

[mivey]

Nevertheless, for most of the higher voltage applications we will see here

Higher meaning voltages above a 250 to 1000 volt threshold.