Low-voltage electric leakage positioning equipment and online electric leakage evaluation method

Abstract

The invention provides low-voltage electric leakage positioning equipment and an on-line electric leakage evaluation method, which are used for accurately selecting an electric leakage fault line of a transformer area and accurately positioning an electric leakage fault position, and the on-line electric leakage evaluation method comprises the following steps of: measuring a current vector sum of A, B, C and N phases of a tested transformer area through a Rogowski coil by using the low-voltage electric leakage positioning equipment in a power-on working state; if the current vector sum, measured by the Rogowski coil, of the tested transformer area is not zero, the evaluation result is that the transformer area has electric leakage, and if the current vector sum, measured by the Rogowski coil, of the tested transformer area is zero, the evaluation result is that the transformer area does not have electric leakage; according to the invention, the configuration of the leakage protector in the rural power distribution area can be standardized, the installation rate and the operation rate of the area protection are improved, the efficiency of the leakage protector is exerted, and the life and property safety of the masses is guaranteed to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of power grid operation and maintenance, in particular to a low-voltage leakage location device and an online leakage evaluation method. Background technique [0002] Leakage of rural distribution network lines is currently a sore point and difficulty that plagues the safe and economic operation of low-voltage rural distribution networks. For a long time, there has been no effective technical means to accurately locate leakage faults, which has brought the following three problems to power grid companies: First, power supply reliability Low-voltage line leakage occurs from time to time, which may easily cause the general leakage protection trip of the station area, and the normal production and living electricity consumption of customers will be greatly affected; secondly, it is difficult to guarantee the safety of electricity use. In case of a leakage fault, the leakage protection cannot act, causing fire o...

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Problems solved by technology

[0002] Leakage of rural distribution network lines is currently a sore point and difficulty that plagues the safe and economic operation of low-voltage rural distribution networks. For a long time, there has been no effective technical means to accurately locate leakage faults, which has brought the following three problems to power grid companies: First, power supply reliability Low-voltage line leakage occurs from time to time, which may easily cause the general leakage protection trip of the station area, and the normal production and living electricity consumption of customers will be greatly affected; secondly, it is difficult to guarantee the safety of electricity use. In case of a leakage fault, the leakage protection cannot act, causing fire or electric shock casualties; third, the economic benefits of the enterprise are damaged, intermittent leakage occurs from time to time, it is difficult to find and deal with it in time, and the power grid enterprise benefits drain

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