A method and device for monitoring and early warning of electrical insulation aging based on insulation conductance

Abstract

This application belongs to the field of electrical insulation aging detection, and specifically relates to an electrical insulation aging monitoring and early warning method and device based on insulation conductance. The method includes: obtaining the voltage vector value and residual current vector value of the electrical circuit; and the residual current vector value to obtain the insulation conductance value of the electrical circuit; the insulation conductance value is integrated with time to obtain the integral parameters of each time period, and freeze and store; according to the integration parameters of each time period and the corresponding set threshold Compare early warning and monitoring. This application selects the insulation conductance as the monitoring parameter of insulation aging. Since the insulation conductance is a parameter with a small value, its integral value is also far smaller, because it can realize extremely sensitive monitoring, and can realize early warning monitoring of electrical insulation aging to avoid electrical insulation. The occurrence of disasters such as electrical fires caused by aging is of great significance.

Description

technical field [0001] The present application relates to the field of electrical insulation aging detection, in particular to an electrical insulation aging monitoring and early warning method and device based on insulation conductance. Background technique [0002] Electrical insulation aging is the main cause of electrical failures, safety accidents, and electrical fires. It will directly cause serious hidden dangers such as electrical insulation degradation, leakage, grounding, and even short circuits. According to statistics, 80-90% of electrical failures are directly caused by electrical insulation aging. indirectly caused. [0003] At this stage, the electrical insulation aging detection mainly adopts the voltage source insulation detection technology, which is beneficial to the electrical insulation aging detection based on the shaker instrument and the common current source insulation detection technology. The various detection technologies at the present stage have...

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Problems solved by technology

[0004] The voltage source insulation detection technology based on the megger instrument has the following defects and deficiencies: it can only be tested and used in a power failure state, and it cannot detect low-voltage electrical appliances. The high voltage of the megger is easy to break down low-voltage electrical appliances; the workload is large, Generally, large and medium-sized shopping malls have to regularly check the electrical insulation status according to the electrical safety inspection regulations, but a continuous inspection period takes several months for the electrician class of the shopping mall.

[0005] Ordinary current source insulation detection technology has the following defects and deficiencies: the power of the current signal source cannot be large, otherwise it will easily interfere with the normal operation of the equipment; the detection accuracy is low, and it is easy to be interfered by the power grid signal, especially for civilian use with a large number of interference sources. The detection accuracy in the power grid is too low, so the common current source insulation detection technology loses its application value

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