3
3.7 Connecting the Clamp Sensors
35
Chapter 3 Measurement Preparations
During wiring, avoid touching the VT(PT), CT or input jacks. Exposed live con-
tacts can cause electric shock or other accident resulting in personal injury or
death.
• When using an external VT (PT), avoid short-circuiting the secondary winding.
If voltage is applied to the primary when the secondary is shorted, high current
flow in the secondary could burn it out and cause a fire.
• When using an external CT, avoid open-circuiting the secondary winding. If
current flows through the primary when the secondary is open, high voltage
across the secondary could present a dangerous hazard.
• Phase difference in an external VT (PT) or CT can cause power measurement errors.
For optimum power measurement accuracy, use a VT (PT) or CT that exhibits mini-
mal phase difference at the operating frequency.
• To ensure safety when using a VT (PT) or CT, one side of the secondary should be
grounded.
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