Is it safe to disconnect CT leads if there is voltage but no current?

[rbalex]

While it may be of some debate whether Section 110.23 applies, it clearly creates a “recognized hazard” and is subject to various state and federal OSHA General Duty Clause regulations.

It's 115 kV main feeder to a substation. I just can't unfortunately, not economically.

For this to fly, you must establish that short-circuiting the CTs is more dangerous to personnel than not; economics is not a safety consideration.

 

[Hv&Lv]

This is the 115kV input to a 50 MW substation that feeds our entire campus, around 1,000 buildings and 500 distribution transformers. Our distribution transformers do not have much metering but these two being so large and critical, they do. There's a pair of 50MVA transformers in the substation, a primary and backup, and both have both primary and secondary metering.

I'm new to this company but I suppose it should have been obvious, the CT's are terminated on shunting terminal blocks, so it is trivially easy to shunt the CT's and switch the polarity of the jumpers between the terminal block and meter.

That makes sense now. It’s compensated metering on the primary side and “checks and balance” metering on the secondary.

 

[shockking]

While it may be of some debate whether Section 110.23 applies, it clearly creates a “recognized hazard” and is subject to various state and federal OSHA General Duty Clause regulations.

For this to fly, you must establish that short-circuiting the CTs is more dangerous to personnel than not; economics is not a safety consideration.

Just to be clear, when I say "I just can't" turn off the power, I mean I would do nothing and live with the backwards CT polarity. Interestingly, these transformers are not de-energized intentionally. One was installed in 2008 and has only been de-energized once due to a fault in 2016. If we didn't have shunting terminal blocks, it would be a long time before we could reverse the CT polarity. Of course, they also wouldn't have been able to replace the meter, so I wouldn't have ended up with reversed polarity like this in the first place...