A New Metering Accuracy Capacitive Potential Device

Previous designs of capacitive potential devices are briefly reviewed with an explanation of why they were not suitable for revenue metering. A new design metering accuracy potential device, capable of meeting 0.3-accuracy class at 400 VA, is presented. Theoretical error formulas are developed and confirmed by actual test results. Adverse effects such as temperature change, frequency shift, voltage change, rainfall, and contamination are considered. Transient response and ferroresonance tests are included.