Electro optical voltage transducer signal processing system

摘要

A system that measures a high electric voltage on an electrical transmission line has an electro optical voltage transducer sensor connected between the electrical transmission line and ground for providing in response to the measured high electric voltage a Sin optical intensity signal and a Cos optical intensity signal. The system also has a signal processor that operates in a first state to digitally process samples of the Sin and said Cos optical intensity signals. The process samples are used to provide a representation of the high electric voltage on the transmission line. The representation can be used for one or more of metering, relaying and transient capture.

主权项

1. A system for measuring a high electric voltage on an electrical transmission line comprising:
an electro optical voltage transducer sensor connected between said electrical transmission line and ground for providing, in response to said measured high electric voltage, (1) a sine (Sin) optical intensity signal, and (2) a cosine (Cos) optical intensity signal; and a signal processor operating in a first state for digitally processing samples of said Sin and said Cos optical intensity signals to provide a representation of said high electric voltage on said transmission line that can be used for one or more of metering, relaying and transient capture wherein said signal processor operating in said first state continuously calculates and memorizes parameters of said Sin and said Cos optical intensity signals when said system is providing said representation of said measured high electric voltage on said voltage electrical transmission, said signal processor operating in a second state when a low voltage fault is detected on said electrical transmission line to provide from said memorized parameters and samples of said Sin and said Cos optical intensity signals a representation of what said high electric voltage would be in the absence of said detected low voltage fault to be used for one or more of metering, relaying and transient capture.