Electro-Optical Voltage Transducer Signal Processing for Transient Capture
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Solution Overview
Problem
Existing electro-optical voltage transducer (EOVT) systems for measuring high electric voltages in electrical transmission systems are limited to metering and cannot accurately capture transient events due to the inability to handle high electrical stresses and impulse tests without glass-air interfaces, which degrades the optical system's performance.
Innovation Solution
A system comprising an electro-optical voltage transducer sensor connected between an electrical transmission line and ground, producing Sin and Cos optical intensity signals, and a digital signal processor that processes these signals to provide a representation of high electric voltage for metering, relaying, and transient capture, using a Bismuthgermanate crystal and optical assembly with temperature compensation to ensure accurate reconstruction of high voltage signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If glass air interfaces are used in the optical system, then the system can be simpler to manufacture, but the system cannot withstand high electrical stresses and impulse tests
Solution Approach 1:
The patent introduces an intermediary substance (oil or pressurized SF6) to fill the insulation column and replace air interfaces. This intermediary medium allows the optical system to withstand high electrical stresses and impulse tests while maintaining optical functionality, as the liquid/pressurized gas medium provides both electrical insulation and optical transmission properties.
Solution Approach 2:
The patent creates an inert environment by filling the insulation column with oil or pressurized SF6, which are electrically insulating and optically transparent materials. This inert environment protects the optical components from electrical breakdown during high voltage operation and impulse testing, eliminating the need for glass-air interfaces that would be vulnerable to electrical stress.
2Device complexity
If the system is designed for metering only, then the device complexity is reduced, but the system cannot capture transient events
Solution Approach 1:
The patent designs the signal processing system to perform multiple functions: metering, relaying, and transient capture. By incorporating a digital signal processor with configurable sampling rates and processing modes, the system can adapt to different application requirements, capturing both steady-state power measurements and high-speed transient events without requiring separate dedicated systems.
Solution Approach 2:
The patent implements dynamic signal processing capabilities where the system can adjust its operation mode based on detected conditions. The digital signal processor can switch between different sampling rates and processing algorithms to handle both normal metering operations and transient capture scenarios, making the system adaptable to varying operational requirements.
3Measurement precision
If higher sampling rates are used to capture transients, then the transient capture capability is improved, but the processing complexity and computational load increase
Solution Approach 1:
The patent applies partial action by using high sampling rates selectively only when transient events are detected, rather than continuously operating at maximum sampling rates. During normal steady-state operation, the system uses lower sampling rates for metering, and only increases sampling resolution when transients are present, thereby reducing overall processing complexity while maintaining transient capture capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables accurate reconstruction and representation of high voltage signals for metering, relaying, and transient recording, with improved accuracy and reliability, including the capture of high-speed transients and impulse tests, by using a digital signal processor to convert optical intensity signals into usable analog signals.
Implementation Method 1
electro optical voltage transducer sensor connected between said electrical transmission line and ground for providing in response to said measured high electric voltage a Sin optical intensity signal and a Cos optical intensity signal
Data Source
AI summary
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.