Measuring device of insulator surface charge of direct-current gas insulated metal enclosed electric transmission line.

A technology for gas-insulated metals and transmission lines, applied in measuring devices, measuring electrical variables, instruments, etc., can solve problems such as the inability to accurately measure the accumulated charges on the surface of DC GIL insulators, and achieve the effect of easy design and simple operation

Active Publication Date: 2015-07-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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AI Technical Summary

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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  • Measuring device of insulator surface charge of direct-current gas insulated metal enclosed electric transmission line.
  • Measuring device of insulator surface charge of direct-current gas insulated metal enclosed electric transmission line.
  • Measuring device of insulator surface charge of direct-current gas insulated metal enclosed electric transmission line.

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Embodiment Construction

[0018] The preferred embodiments are described in detail below in conjunction with the drawings.

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

[0020] When the optical axis of the crystal medium without the center of symmetry is the same as the optical axis of the incident light, and the light vibration direction is at an angle of 45° with 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] Δθ ( x , y ) = 2 π λ n 0 3 γ 41 d E z ( x , y )

[0022] Where λ represents the wavelength of incident light; n 0 Indicates the refractive index of ordinary light in the crystal; γ 41 Represent...

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Abstract

The invention belongs to the technical field of surface charge accumulation characteristic testing of high-voltage direct current solid insulating material, and in particular relates to a measuring device of direct-current GIL basin-type insulator surface charge based on Pockels effect. The measuring device comprises a helium-neon laser, a polarized light separator, a high-speed camera, a 1/8 valve plate, bismuth silicate crystal, an insulating vacuum tube, a sliding block, a rotating shaft and an insulating guide rod. When measuring is conducted, a bismuth silicate probe is stuck to the surface of an basin-type insulator, a red laser is emitted from the helium-neon laser, the red laser is turned into elliptically polarized light through the polarized light separator and the 1/8 valve plate, the light entries into the bismuth silicate probe and is reflected at a division surface of bismuth silicate and the basin-type insulator, the light penetrates the 1/8 valve plate again and enters the high-speed camera after right-angle refraction is conducted on the light, optical intensity distribution is measured, and the size of the quantity of electric charge is acquired after being processed by a computer. The measuring device has the advantages that the structure is simple, the operation is convenient, and efficient measuring means is provided for studying of direct-current GIL basin-type insulator surface charge accumulation.

Description

Technical field [0001] The invention belongs to the technical field of measuring the surface charge accumulation characteristics of high-voltage direct current solid insulating materials, and in particular relates to a direct current gas-insulated metal enclosed transmission line basin-type insulator surface charge measuring device based on the Pockels effect. Background technique [0002] The Gas Insulated Metal Enclosed Transmission Line (GIL) has the characteristics of large transmission capacity, low loss, small capacitance, small area, high reliability, and suitable for harsh environments. It has the characteristics of large altitude difference, terrain and weather. It has been widely used in harsh conditions or large transmission capacity. But at present, all AC GILs achieve commercial operation, but DC GILs have not been applied on a large scale in actual projects. The main reason is that under the action of direct current voltage, the surface charge of the supporting ins...

Claims

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Application Information

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Patent Type & Authority Applications(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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