Sulfur hexafluoride gas insulated power equipment (hereinafter referred to as SF

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equipment) has been widely used because of its excellent insulation

arc extinguishin

g performance

small footprint

high reliability

safety

small maintenance workload and many other advantages. Many factors may lead to insulation defects in SF

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equipment during installation and operation. Measuring the content of typical decomposition products in SF

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gas in the equipment is one of the most effective detection methods to judge insulation defects. In order to detect the decomposition products of SF

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gas

off-line instruments are usually used to conduct regular inspection of SF

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equipment in substations. This method has few detection components and poor real-time performance. Usually

the abnormal gas components can be detected after the equipment failure

so it can not prevent the latent failure of the equipment in advance. In this paper

a technology of high-precision separation and multi-channel continuous measurement of SF

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gas decomposition products is proposed

which solves the technical problems such as unstable gas flow

low efficiency of single channel detection and inability to remotely carry out chromatographic sampling and analysis in the process of long-time monitoring. Compared with the traditional off-line detection methods

this method has more detection components

remote real-time monitoring

good long-time monitoring stability and higher monitoring efficiency

which fills the deficiency of gas chromatography monitoring method in the field of SF

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gas on-line monitoring. By continuously monitoring the content of more than 10 characteristic gas components in SF

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equipment

the current insulation defect state of SF

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equipment can be evaluated accurately

real-time and efficiently.