Gauss quadrature algorithm-based optical voltage transformer

Abstract

The invention relates to a Gauss quadrature algorithm-based optical voltage transformer. The Gauss quadrature algorithm-based optical voltage transformer includes a grading ring, a high-voltage side electrode, a low-voltage grounding side electrode, a shielding tube, a base, a transmission unit, a high-voltage binding post, a hollow insulator, electric field sensors, an SLD light source and a signal acquisition and processing unit. The grading ring is located at the exterior of the top of the hollow insulator; the high-voltage binding post is located at the topmost end of the hollow insulator and is connected with the high-voltage side electrode; the high-voltage side electrode and the low-voltage grounding side electrode are arranged in the hollow insulator; the high-voltage side electrode and the low-voltage grounding side electrode are respectively located at the top and the bottom of the hollow insulator; the electric field sensors are connected with the SLD light source and the signal acquisition and processing unit through the transmission unit; and polarized light with phase difference transmitted from the electric field sensors is transferred to the signal acquisition and processing unit for performing signal acquisition and data processing. According to the Gauss quadrature algorithm-based optical voltage transformer of the invention, the five electric field sensors are adopted; Gauss-Legendre quadrature is performed on electric field values measured by the five electric field sensors, so that a high-voltage side voltage value can be calculated out; and therefore, influence of temperature and external magnetic fields on the optical voltage transformer can be decreased, and measurement accuracy and operation stability of the optical voltage transformer can be improved.

Description

technical field [0001] The invention relates to an optical voltage transformer based on a Gaussian quadrature algorithm, relates to the field of power system measurement, and is used for real-time measurement of line voltage in a substation. Background technique [0002] With the rise of the voltage level and capacity of the power system, the requirements for the measurement equipment of the relay protection device are getting higher and higher. Defects such as narrow frequency band can no longer meet the needs of measurement. In order to make up for the above deficiencies, electronic transformers have been developed rapidly, and electronic voltage transformers of capacitor voltage divider type and resistance voltage divider type have been applied in power systems to a certain extent. However, due to the delay in the response of the capacitor voltage divider type electronic voltage transformer to the measured voltage, and the phenomenon of charge retention when the line is ...

AI Technical Summary

Problems solved by technology

However, the optical voltage transformer is greatly affected by the environment, especially the interference of temperature and external electromagnetic field.

At the same time, due to the shortcomings of the manufacturing process of the optical crystal, the stability and reliability of the long-term operation of the optical voltage transformer cannot be guaranteed.

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