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Electrostatic probe-based GIL insulator surface charge on-line monitoring system

A surface charge and monitoring system technology, applied in the field of electricity, can solve the problems of inability to meet the online measurement of GIL insulator surface charge, low voltage input range, etc., achieve the effect of cheap materials, mature manufacturing process, and suppress partial discharge

Active Publication Date: 2020-10-13
HUNAN UNIV
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Problems solved by technology

[0005] However, the induced voltage of the internal conductor of the capacitive electrostatic probe is collected in real time by an operational amplifier, and the voltage input range of the operational amplifier is often low (eg: ±20V), which is far smaller than the actual operating voltage of the GIL insulator
Therefore, the capacitive electrostatic probe cannot meet the online measurement of the surface charge of GIL insulators

Method used

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  • Electrostatic probe-based GIL insulator surface charge on-line monitoring system
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  • Electrostatic probe-based GIL insulator surface charge on-line monitoring system

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Embodiment 1

[0028] The invention provides a novel on-line monitoring system for the surface charge of a GIL insulator, which uses a capacitive electrostatic probe to monitor the accumulation degree of the surface charge of the insulator on-line.

[0029] Due to the electrostatic induction phenomenon of the metal electrode in the electric field, it has a certain potential. The magnitude of the potential is proportional to the strength of the field source (such as: electrode voltage, surface charge, and space charge), and inversely proportional to the distance to the field source. For DC GIL, when the operating voltage is stable and the space charge is negligible, only the surface charge accumulated at the gas-solid interface is the only field source of change. Therefore, the degree of charge accumulation on the surface of the GIL insulator can be judged by monitoring the change of the induced potential on the metal electrode.

[0030] The electrostatic probe designed by the present invent...

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Abstract

The invention discloses an electrostatic probe-based GIL insulator surface charge on-line monitoring system, which comprises an electrostatic probe; the electrostatic probe comprises three fan-ring-shaped red copper electrodes uniformly distributed along the circumferential direction of the electrostatic probe, fan-ring-shaped epoxy insulators are fixed between the fan-ring-shaped red copper electrodes, and the epoxy insulators are fixedly connected with an insulator; the fan-ring-shaped red copper electrodes are connected with resistance voltage dividing arms, the resistance voltage dividingarms are electrically connected with operational amplifiers, and the operational amplifiers are electrically connected with induction potential data acquisition devices used for detecting the fan-ring-shaped red copper electrodes. The electrostatic probe is pre-installed near a ground electrode of a GIL insulator, probe induction voltage is stored in real time through the data acquisition system,and the surface charge accumulation condition can be monitored in real time; the electrostatic probe measures surface charges in a non-contact manner, the original surface charge distribution is not damaged, and the probe adopts a circular ring design, so that the distortion of the probe to an original electric field can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of electricity, and in particular relates to an on-line monitoring system for surface charges of GIL insulators based on an electrostatic probe. Background technique [0002] Gas-insulated transmission line (GIL) has the advantages of large transmission capacity, high reliability, small footprint and environmental friendliness, and has attracted extensive attention from researchers. However, the GILs currently in operation basically operate in AC mode, and DC GILs have not yet been put into operation. This is mainly due to the fact that the surface of GIL insulators operating under DC voltage for a long time is easy to accumulate charges, and the accumulation of surface charges will distort the original electric field and reduce the flashover voltage. The charge accumulation on the surface of insulators is one of the key factors restricting the wide application of DC GILs besides metal particles. Therefore, it is ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/24
CPCG01R29/24
Inventor 汪沨梁芳蔚陈赦钟理鹏谭阳红
Owner HUNAN UNIV
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