E-17
APPENDIX E/ Common Circuit Connections
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
HDPQ Xplorer when voltage computations are performed. The PT scale factor is
usually mounted on the PT assembly and is entered into the HDPQ Xplorer on the scale
factors screen. 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 HDPQ
Xplorer 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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