Secondary Conductor Length off of Metering VT's

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cfish3434

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Is anyone aware as to any restrictions on the length of a secondary conductor tapped off of a metering VT in a piece of 15kV switchgear? Long story short, we are looking to install remote customer metering downstream of a 15kV T-splice about 600 feet away from the main gear. We have the ability to add CT's at the location, but I don't have room for PT's and was hoping to use the customer owned VT's in the gear to derive the voltage input for the meter. I would plan on fusing the conductor at both ends.

Is there anything to consider other than voltage drop on the circuit?

Thanks!
 
Utility Grade PTs

Utility Grade PTs

In field metering installations where 15kV-class PTs are installed, the PT secondary is generally not fused. PTs are generally primary fused in switchgear but not outdoors. When we put PTs in a substation, we place 20A fuses close to the PTs. Many solid-dielectric PTs are not fused by utilities and the rarely fail, as long as there is no short circuit. You have have metering errors running long PT or CT leads. Many CTs have limited burden capabilities. The resistance of a long wire may cause the CT to saturate, leading to inaccurate metering. Long PTs runs may induce phase shift in the voltage leading to inaccurate metering.
 
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