E-16
Connecting to a Potential Transformer, continued
Procedure
Follow these steps to connect voltage probes to a potential transformer.
Scale factor
The scale factor of the PT must be accounted for in making accurate voltage
measurements. Because the monitored output voltage of the PT is stepped-down
(divided) from the original voltage, this ratio must be stepped-up (multiplied) by the
PX5 when voltage computations are performed. The PT scale factor is usually mounted
on the PT assembly and is entered into the PX5 on the scale factors screen (refer to
page 5-10). Refer to the PT manufacturer’s literature for the scale factor of the device
you are using.
Step Action
1 Turn off power to the PT.
2 Connect the colored voltage probes to the channel inputs on the PX5 top
panel.
3 Connect the colored voltage probes to the PT’s connections in
accordance with the manufacturer’s instructions.
4 Turn on power to the PT.
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