Low-voltage line on-load electric leakage checking device and method

Abstract

The invention discloses a low-voltage line on-load electric leakage checking device and method. The device comprises a tong-type ammeter and an electric leakage detection circuit, the electric leakagedetection circuit comprises a first power connection clamp, a second power connection clamp, a current limiting element, a rectification module and a third power connection clamp, the first power connection clamp and the second power connection clamp are connected through a wire. The current-limiting element and the rectification module are connected in series on a lead connected with the first power connection clamp and the third power connection clamp, and the rectification module is arranged to enable current to be unidirectionally conducted from the first power connection clamp to the third power connection clamp. According to the invention, the electric leakage position can be quickly and accurately diagnosed, and the quick response of electric leakage maintenance of the power transmission line is greatly improved; the device is convenient to carry and easy to operate, all components of the device are low in cost and can be repeatedly used, and the use cost is reduced; the transformer does not need to be disassembled, the labor intensity in the checking process is reduced, the electric leakage position can be checked under the condition of no power failure, residents and enterprise power consumption cannot be influenced in the checking process, and application and popularization are facilitated.

Description

Technical field [0001] The invention relates to the field of power transmission, and in particular to a device and method for checking the leakage of low-voltage lines with simple operation and capable of quickly checking load. Background technique [0002] Among the existing power transmission lines, when the transformer transmission line transmits power to users (under 0.4KV), leakage may sometimes occur, which requires power technicians to conduct investigation and maintenance. [0003] At present, the commonly used leakage checking methods are as attached figure 1 As shown, before checking the leakage, you must first remove all the four wires A, B, C and N of the main switch of the distribution box, and then connect the four wires together, and then jump from any one of the switch front ends. Connect one phase wire to the three phase wires that were originally removed, so that the leakage line will pass through the earth and the grounded flat iron of the transformer to form a l...

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Problems solved by technology

[0004] There are following problems in this mode: technicians need to disassemble each phase line of the output terminal of the main switch of the distribution box, and at the same time, it is necessary to gradually check the A, B and C three-phase lines, the workload is very large, and it is not safe; especially, During the inspection process, it is necessary to deal with power outages for residents or factories and enterprises in the leakage area, which will bring great inconvenience to the lives of residents and the production and use of electricity by enterprises.

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