Device for measuring surface charge on insulators of DC gas-insulated metal-enclosed transmission lines

A gas-insulated metal and power transmission line technology, applied in measuring devices, measuring electrical variables, instruments, etc., can solve the problem of inability to accurately measure the accumulated charge on the surface of the DC GIL insulator, and achieve the effect of easy design and simple operation

Active Publication Date: 2018-07-31
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

[0007] In summary, neither the powder layer map method nor the electrostatic capacitance probe method can accurately measure the accumulated charge on the surface of DC GIL insulators

Method used

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  • Device for measuring surface charge on insulators of DC gas-insulated metal-enclosed transmission lines
  • Device for measuring surface charge on insulators of DC gas-insulated metal-enclosed transmission lines
  • Device for measuring surface charge on insulators of DC gas-insulated metal-enclosed transmission lines

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Embodiment Construction

[0018] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings.

[0019] The working principle of the present invention is as figure 1 As shown, the specific description is as follows:

[0020] When the optical axis of the crystal medium without a center of symmetry is the same as that of the incident light, and the optical vibration direction is at an angle of 45° to the main vibration direction of the crystal, according to the Pockels effect, the electric field distribution E acting on the crystal is z The size of (x, y) has the following relationship with the polarization phase difference Δθ of birefringence produced by the crystal under the action of the electric field:

[0021]

[0022] Where λ represents the wavelength of the incident light; n 0 Indicates the refractive index of ordinary light in the crystal; γ 41 Represents the Pockels constant of the crystal; d represents the thickness of the crystal. The measure...

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Abstract

The invention belongs to the technical field of measuring the surface charge accumulation characteristics of high-voltage DC solid insulating materials, and in particular relates to a device for measuring the surface charge of a DC GIL basin-type insulator based on the Pockels effect, comprising: a helium-neon laser, a polarized light separator, a high-speed camera, 1 / 8-wave plate, bismuth silicate crystal, insulated vacuum tube, slider, rotating shaft and insulated guide rod. When measuring, paste the bismuth silicate probe on the surface of the pot insulator, the helium-neon laser emits red light, which becomes elliptical polarized light through the polarized light separator and 1 / 8 wave plate, the light enters the bismuth silicate probe, and The interface between the bismuth and the pot insulator generates reflection, passes through the 1 / 8 wave plate again, refracts at right angles in the polarized light separator, enters the high-speed camera, measures the light intensity distribution, and obtains the magnitude of the charge after computer processing. The measuring device is simple in structure and easy to operate, which provides an effective measuring means for studying the charge accumulation on the surface of pot insulators in DC GIL.

Description

technical field [0001] The invention belongs to the technical field of measuring the surface charge accumulation characteristics of high-voltage DC solid insulating materials, and in particular relates to a device for measuring the surface charge of basin-type insulators of DC gas-insulated metal-enclosed transmission lines based on the Pockels effect. Background technique [0002] Gas Insulated Metal Enclosed Transmission Line (GIL, Gas Insulated Metal Enclosed Transmission Line) has the characteristics of large transmission capacity, small loss, small capacitance, small footprint, high reliability, and is suitable for harsh environments. It is widely used in harsh or large transmission capacity occasions. But at present, AC GILs are used for commercial operation, while DC GILs have not been applied on a large scale in actual projects. The main reason is that under the action of DC voltage, the surface charge of the supporting insulator in the DC GIL accumulates seriously,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/24
Inventor 李成榕周宏扬马国明
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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