Transformer Inaccuracies - Satec expertmeter PM180 Application Note

High performance analyzer, fault locator

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1.5 Transformer Inaccuracies

The time skew of voltage and current signals contribute large into inaccuracy of distance

calculations. This especially concerns customer instrument transformers that may introduce

significant phase errors. To minimize the effect of the transformer inaccuracies, follow the

instructions below:

1. The device's input voltage and current transformers are carefully calibrated at the

factory. In the event the device is provided with a 200-amps DFR module, use it only

with the supplied current transformers. Connect the transformers to the input terminals

according to the phase marking labels.

2. Use the device transformer correction setup to provide information on customer

instrument transformers' errors.

3. If your instrument transformers have significantly non-linear angle error response, use

the fault locator transformer correction setup to provide information on transformers

phase errors over the entire measurement range.

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