E-16
Connecting to a Potential Transformer
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
4400 when voltage computations are performed. The PT scale factor is usually
mounted on the PT assembly and is entered into the 4400 on the scale factors screen
(refer to page 5-10). Refer to the PT manufacturer’s literature for the scale factor for 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 4400
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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