Our passive optical voltage transducer uses light to accurately measure voltage on high voltage power lines. This measurement meets the accuracy requirements of class 0.2 for metering as defined in IEC and is used as an input to electronic metering and / or relaying systems.
General Construction
The EOVT optical voltage sensing element operates in an SF6 atmosphere contained in a composite bushing consisting of a fiberglass tube support and silicone rubber sheds. Light is transmitted to the EOVT sensors at high voltage from an electronics module in the substation control house. The light passes through the EOVT sensor and is returned to the control house. The electronic module in the control house processes the light signal from the EOVT and provides a 120 volt nominal analog output. Connections between the EOVT sensing units in the substation and the electronics module in the control house are via optical fiber cable.
Benefits
No capacitive dividers are used and full line to ground voltage is applied across the EOVT sensor. This design permits true voltage measurement to be performed for the highest possible accuracy and stability. It is lighter and smaller than conventional oil-filled voltage transformers. The elimination of oil/paper insulation provides enhanced safety and reduced maintenance costs.