Distance effect on Voltage Transformer accuracy

[Designer69]

We are using GE PTW3 voltage transformers with an accuracy class of 0.3 WXMY which means they will maintain a 0.3 accuracy from 0 VA to 75 VA burden.

we have quite a large distance for the connection from these voltage transfomers to the end device (1000 ft)

Wondering if anyone is familiar with this, if this distance has an effect on the accuracy of these voltage transformers or if it is already factored in given it's within the specified burden range.

Tried calling GE but no luck.

Thanks

 

[rcwilson]

We are using GE PTW3 voltage transformers with an accuracy class of 0.3 WXMY which means they will maintain a 0.3 accuracy from 0 VA to 75 VA burden.

we have quite a large distance for the connection from these voltage transfomers to the end device (1000 ft)

Wondering if anyone is familiar with this, if this distance has an effect on the accuracy of these voltage transformers or if it is already factored in given it's within the specified burden range.

Tried calling GE but no luck.

Thanks

Voltage at the VT will still be accurate but the voltage drop in the wiring to the meter may add errors.

If the meter draws 10VA or about 0.1 amp (typical for an electronic device's voltage input), the voltage drop over 2,000 feet of #12 wire would be about 2 ohms/1000' x 2000' x 0.1 A = 0.4 V or 0.4V/120V = 0.33% of the signal. If the meter power supply also comes from the VT input, the error might be as high as 1.5% for 50VA of power.

Use bigger wire if that error is an issue.