Medium coating method for improving electric field distribution in optical voltage transformer
A dielectric wrapping, optical voltage technology, applied in voltage/current isolation, instrumentation, measurement of electrical variables, etc., can solve problems such as voltage integration error, optical path offset, affecting the electric field distribution in electro-optic crystals, and achieve uniformity improvement and avoidance. The effect of electric field mutation
Inactive Publication Date: 2017-05-31
FUZHOU UNIV
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Problems solved by technology
In practical applications, optical voltage transformers are inevitably affected by problems such as vibration, aging of component connections, thermal expansion and contraction, etc., resulting in offsets in the mutual positions of optical components or offsets in optical paths, which in turn affect the electro-optic crystals. Distribution of electric field
For example, ABB proposed an optical voltage transformer with a five-piece bismuth germanate crystal superposition structure. When the optical path or the electro-optic crystal is slightly shifted, the internal electric field distribution of the electro-optic crystal will be uneven, and a voltage integration error of about 0.5% will be introduced. Meets the 0.2% accuracy requirement
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Embodiment 1
[0023] Taking the optical voltage transformer of 110kV voltage level as an example, the electro-optic crystal is bismuth germanate crystal, which has a length of 50mm, a diameter of 10mm, and a dielectric constant of 16.3; quartz glass (including the first quartz glass and the second quartz glass) Each piece has a length of 34.575mm, a diameter of 10mm, and a dielectric constant of 3.8; the wrapping medium is alumina ceramics, and its dielectric constant is 10.
[0024] Please refer to figure 2 , the error introduced when the optical path is offset ε 1 As an objective function, the thickness of the alumina ceramic wrapped around the electro-optic crystal d (perpendicular to the electric field direction) is used as a variable for fitting, and the error expression at this time is obtained as:
[0025]
[0026] Please refer to image 3 , similarly, the error introduced when the crystal is offset ε 2 and the thickness of alumina ceramic d Fitting, the expression of the ...
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The invention relates to a medium coating method for improving electric field distribution in an optical voltage transformer. The medium coating method is characterized in that first quartz glass, electro-optical crystal and second quartz glass are sequentially arranged between a high-voltage electrode and a ground electrode; and aluminum oxide ceramic coats the peripheral side of the electro-optical crystal. The integral voltage error of the voltage transformer is effectively reduced and the measurement accuracy is improved.
Description
technical field [0001] The invention relates to a medium wrapping method for improving electric field distribution in an optical voltage transformer. Background technique [0002] Optical voltage transformers can effectively overcome the shortcomings of traditional electromagnetic voltage transformers, adapt to the development of intelligent power systems, and have broad application prospects. The core of the optical voltage transformer is an electro-optic crystal based on the Pockels effect, and the uniformity of the electric field distribution in it has a great influence on the measurement results. In practical applications, optical voltage transformers are inevitably affected by problems such as vibration, aging of component connections, thermal expansion and contraction, etc., resulting in offsets in the mutual positions of optical components or offsets in optical paths, which in turn affect the electro-optic crystals. The distribution of the electric field. For exampl...
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Login to View More IPC IPC(8): G01R15/24
CPCG01R15/242G01R15/247
Inventor 徐启峰黄奕钒许志坤项宇锴
Owner FUZHOU UNIV