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Device and method for measuring surface charge distribution of basin-type insulator before and after surface flashover

A technology of basin-type insulators and surface flashover, which is applied to measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problem of difficult to measure the surface charge before and after flashover, and achieves the saving of measuring time, the method is simple and reliable, and the operation is easy. Effect

Active Publication Date: 2020-08-07
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the object of the present invention is to provide a device and method for measuring the surface charge distribution of pot insulators before and after surface flashover in order to overcome the defects of the above-mentioned prior art, which solves the problem that it is difficult to measure the distribution of surface charges before and after flashover And significantly improve the measurement accuracy

Method used

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  • Device and method for measuring surface charge distribution of basin-type insulator before and after surface flashover

Examples

Experimental program
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Effect test

Embodiment 1

[0080] Step 1: Wipe the surface of the two pot insulators with a diameter of 180mm to be measured with absolute ethanol, and let it stand for more than 12 hours. The flashover voltage obtained by the 180mm pot insulator is roughly 360kV-420kV, and the 600kV high-voltage DC source can make it flashover along the surface, and then the surface charge distribution before and after the flashover along the surface can be measured.

[0081] Step 2: Install the two pot insulators to be measured in parallel in the 220kV GIS cavity 3, and install shielding covers before and after the pot insulators to shield the high-voltage electrodes, the field strength at the three junctions of the insulator and sulfur hexafluoride gas , connect the surface charge measurement device 6 with the GIS cavity 3, avoid metal debris falling into the GIS cavity 3 during the installation process, connect the high-voltage DC source 1 to the current-limiting resistor 2 through the high-voltage lead, and the curr...

Embodiment 2

[0088] The difference from Example 1 is that the high-voltage DC voltage applied in step 4 is not evenly boosted until the insulator flashover occurs, but is evenly boosted to 400kV at a boosting speed of 5kV / s and then no longer boosted. And keep the DC voltage at 400kV, and wait for the surface flashover of the pot insulator. After the surface flashover occurs, continue the steps of the second embodiment to measure the surface charge distribution of the pot insulator before and after the surface flashover under the long-term withstand voltage.

Embodiment 3

[0090] The difference from the first embodiment is that the high voltage AC voltage is applied in the fourth step.

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Abstract

The invention discloses a device and a method for measuring surface charge distribution of a basin-type insulator before and after surface flashover. In the device, a current-limiting resistor is connected in parallel with a high-voltage direct-current source. A GIS cavity is connected with a current-limiting resistor. The GIS cavity is filled with gas with preset pressure. The same first basin-type insulator and second basin-type insulator are arranged in the GIS cavity in parallel. The high-voltage direct-current source applies voltage with preset amplitude and preset time to the first basin-type insulator and the second basin-type insulator so as to generate surface flashover. The surface charge measuring device is connected with the GIS cavity. The electrostatic probe obtains first surface charge distribution and second surface charge distribution of the first basin-type insulator and the second basin-type insulator. The charge amplifier is connected with the electrostatic probe toamplify the first surface charge distribution and the second surface charge distribution, the higher one of the first surface charge distribution and the second surface charge distribution is the surface charge distribution of the basin-type insulator after surface flashover, and the lower one is the surface charge distribution of the basin-type insulator before surface flashover.

Description

technical field [0001] The invention relates to the technical field of surface discharge of solid insulating materials, in particular to a device and method for measuring surface charge distribution before and after surface flashover of basin-type insulators. Background technique [0002] In the HVDC transmission system, due to the continuous effect of DC high voltage, surface charges will accumulate on the insulating devices of gas-insulated metal-enclosed transmission lines (GIL) and gas-insulated switchgears (GIS). The insulation performance has a great influence, which is easy to cause flashover along the surface, and has serious consequences for the safe and stable operation of the transmission system. According to the operation experience of GIS, more than 30% of the faults originate from the surface flashover of insulators. In most cases, insulators become the weakest link and restrictive factor of the entire power transmission system. Among them, the pot insulator p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1245
Inventor 赵军平王强高一平文韬郝留成王亚祥
Owner STATE GRID CORP OF CHINA