Optical voltage transformer based on SF6 coaxial capacitance voltage divider

Abstract

The invention provides an optical voltage transformer based on an SF6 coaxial capacitance voltage divider. The optical voltage transformer comprises a high voltage shell, an insulation casing and a base. The high voltage shell and the insulation casing are connected to a whole body. Both the high voltage shell and the insulation casing are filled with SF6 gas. The base is fixedly connected to the insulation casing, and the base and the insulation casing are separated by a baffle plate. The base is provided with a grounding terminal. The invention relates to the optical voltage transformer based on the SF6 coaxial capacitance voltage divider. By using the SF6 coaxial capacitor formed by a primary conduction rod and an annular metal electrode as a high voltage side voltage divider capacitor, the problem of difficult manufacture of a current optical voltage transformer high voltage capacitor. The transformer has the advantages of small size, light weight and high accuracy, and the overall error is less than 0.1%.

Description

technical field [0001] The invention relates to a SF-based 6 Optical voltage transformer with coaxial capacitive voltage division, used for real-time measurement of voltage on high-voltage transmission lines in power plants or substations. Background technique [0002] Voltage transformer is one of the important equipment for voltage measurement and line protection in power system. Traditional voltage transformers cannot meet the development needs of smart grids due to their narrow measurement frequency band, difficulty in insulation, and susceptibility to ferromagnetic resonance, and are gradually replaced by electronic voltage transformers. According to the sensing principle, electronic voltage transformers are mainly divided into transformers based on traditional sensing principles and transformers based on optical sensing principles. The transformer based on the traditional sensing principle still adopts the traditional form of series capacitor voltage division or resi...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that the current voltage-dividing optical voltage transformers are difficult to manufacture high-voltage capacitors, are easily affected by stray capacitance, and have low accuracy, the present invention proposes a method based on SF 6 Coaxial Capacitive Voltage Divider Optical Voltage Transformer

SF using its primary guide rod and ring metal electrode 6 The coaxial capacitor is used as a voltage dividing capacitor on the high-voltage side, which overcomes the difficulty in making the high-voltage capacitor of the current optical voltage transformer

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