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Experimental system and method for simulating charge accumulation on surface of gas solid in different kinds of gas at different temperatures

A technology for simulating experiments and electric charges, applied in the direction of measuring electricity, measuring electric variables, instruments, etc., can solve the problems of inability to conduct experimental research on insulator surface accumulation charges, inability to control insulator temperature, and no temperature control system, so as to promote research and development and practicality , Improve the accuracy, the effect of high measurement accuracy

Active Publication Date: 2014-09-03
CHONGQING UNIV +1
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to research, the main factors affecting the accumulation and dissipation of charges on the surface of insulators inside GIS are: the dielectric constant of insulators, the volume resistivity of insulators, and the surface resistivity of insulators. Changes in the temperature of insulators may lead to a serious decline in their insulating properties.
At the same time, domestic and foreign scholars have little research on the influence of temperature on the dynamic characteristics of insulator surface charge and its flashover voltage. Therefore, it is urgent to carry out experimental research on the accumulation of charge on the surface of insulators at different temperatures.
[0004] At present, for the research on the phenomenon of charge accumulation on the surface of insulators, most scholars at home and abroad are still in the experimental stage, and the experimental devices used also have many shortcomings, such as: (1) The insulator model is mostly a thin cylindrical shape that is convenient for measurement. It is mostly carried out in a low-pressure atmosphere, and these are seriously inconsistent with the actual insulation conditions inside the gas-insulated equipment; (2) the surface charge measurement system can only scan and measure an insulator model with a fixed shape, which is not convenient for carrying out a large number of experimental studies; (3) The experimental device has no temperature control system, so the temperature of the insulator cannot be controlled, so it is impossible to carry out experimental research on the accumulation of charges on the surface of the insulator at different temperatures

Method used

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  • Experimental system and method for simulating charge accumulation on surface of gas solid in different kinds of gas at different temperatures
  • Experimental system and method for simulating charge accumulation on surface of gas solid in different kinds of gas at different temperatures
  • Experimental system and method for simulating charge accumulation on surface of gas solid in different kinds of gas at different temperatures

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Experimental program
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Embodiment 1

[0042] This embodiment discloses a simulation experiment system for charge accumulation on gas-solid surfaces in different temperatures and gases, including a main casing 8, a side casing 9, an upper parallel plate electrode 7, a lower parallel plate electrode 25, an electrostatic measuring probe 20, a high-speed High-voltage electrostatic potentiometer 47, corona needle 510, heating system, and experimental circuit.

[0043] The main housing 8 is a hollow cylinder with open upper and lower ends, and the lateral housing 9 is a hollow cylinder with one end open and the other closed. In the embodiment, the axial direction of the main housing 8 is perpendicular to the horizontal plane, and the axial direction of the lateral housing 9 is parallel to the horizontal plane. The open end of the side housing 9 is connected to the cylinder wall of the main housing 8 . The cylinder wall of the main housing 8 is provided with a through hole, and the open end of the lateral housing 9 comm...

Embodiment 2

[0060] A method for conducting experiments in a gas-solid surface accumulation charge simulation experiment system at different temperatures and gases, characterized in that it comprises the following steps:

[0061] 1) Fix the insulator 24 as the object under test on the upper end of the longitudinal rotation shaft 26 .

[0062] The high voltage bushing 1 , the main casing 8 and the side casing 9 are installed. Check the airtightness of the high voltage bushing 1 , the main casing 8 and the side casing 9 . Gas is filled into the high-voltage bushing 1 through the upper air inlet and outlet 2 . Gas is charged into the main casing 8 and the side casing 9 through the lower gas inlet and outlet 30 . In the embodiment, the composition of the gas is determined according to the experimental requirements. Generally, 0.2-0.3 MPa of SF is charged. 6 and other insulating gases.

[0063] 2) By adjusting the insulator motion control system, the upper end of the insulator 24 is in good...

Embodiment 3

[0073] The main structure of this embodiment is the same as that of Embodiment 1. Further, the upper end of the high voltage bushing 1 is located above the upper cover plate 5 , that is, the upper end of the high voltage bushing 1 is exposed above the upper cover plate 5 . The lower end of the high voltage bushing 1 protrudes into the inner cavity of the main casing 8 . The high voltage bushing 1 has a hollow inner cavity, and its axial direction is perpendicular to the horizontal plane.

[0074] The upper and lower ends of the high-voltage bushing 1 are provided with through holes for the high-voltage conductive rod 4 to pass through. The first static sealing seat ring 3 and the second static sealing seat ring 6 are respectively embedded in the through holes at the upper and lower ends of the high voltage bushing 1 . The lower end of the high-voltage conductive rod 4 first passes through the first static sealing seat 3 and then the second static sealing seat 6, and then ext...

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Abstract

The invention provides an experimental system and method for simulating charge accumulation on the surface of a gas solid in different kinds of gas at different temperatures aiming at the defect of an existing device for simulating charge accumulation on the surface of an insulator in an SF6 environment. The temperature of an experimental electrode can be accurately controlled, the state of charge accumulation on the surface of the insulator at the different temperatures is simulated, influence on flash-over voltage of the surface from charge distribution on the surface of the insulator is studied, and the reliable experimental foundation is provided for intensive study of charge accumulation on the surface of the insulator.

Description

technical field [0001] The invention belongs to the field of high-voltage equipment and electronic technology simulation experiments. Background technique [0002] Gas insulated switchgear (GIS for short) has been widely used in my country's power system due to its advantages of high dielectric strength, small footprint, no influence from external environment, long maintenance cycle and less maintenance. Compared with AC GIS, charge accumulation on the surface of insulators has always been one of the key technical problems affecting the large-scale practical application of DC GIS. Under the action of DC high voltage, the surface of the insulator inside the GIS is easy to accumulate charge, and the accumulated charge may distort the original electric field distribution along the surface of the insulator, resulting in a serious decline in the insulation characteristics of the insulator and causing insulation failure. With the rapid development of DC high-voltage transmission ...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 唐炬张晓星王邸博刘凯王立强
Owner CHONGQING UNIV
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