Just wondering if anyone on here has thought about this scenario playing out. When our maintenance crews perform routine maintenance on HV circuit breakers, they typically throw up safety grounds on the HV drops to guarantee the equipment de-energized. The CT circuits remain in service. If the breaker is closed, then we have created a primary loop for current to flow. Due to this primary loop, the impedance of the secondary winding collapses. I included a graphic for any interested. If the CT is incorporated into (for ex) a HV bus differential protection scheme. Is there a possibility of the bus protection not operating due to differential (operate) current diverting thru the CT? I haven't seen any work practice to deal with this, so I'm wondering if what I am describing is actually a concern or not.
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