Contact box with online ground fault detection and three-remote functions

Abstract

The invention discloses a contact box with online ground fault detection and three-remote functions. The contact box is arranged in a KYN61-40.5 intermediate switch cabinet and comprises a background management module, a detecting and sending module, an alarm module and a sensing module. The contact box with the online ground fault detection and three-remote functions has the advantages that the contact box succeeds in mastering three-phase current and zero-sequence current change information in real time, discovering ground fault timely and achieving remote telemetering, telesignalization and relevant telecontrol of ground faults of the switch cabinet and can guarantee that safe and stable operation of the switch cabinet cannot be affected by existence of the ground faults, so that power supply reliability is improved effectively.

Description

technical field [0001] The invention relates to a contact box with the functions of on-line detection of grounding faults and three remotes. [0002] Background technique. [0003] With the development of science and technology and the continuous improvement of the quality of human life, the society's total demand for electric energy is growing rapidly, and at the same time, the requirements for electric energy quality are also significantly improved. In order to provide power with high energy efficiency and low loss, the mid-mounted switchgear power supply technology is widely used due to its advantages of high structural strength, reliable and safe operation, small maintenance and low operating cost. At present, in my country's power industry, KYN61 central switchgear has been widely used in power grids with voltage levels of 110KV and above. [0004] Although the existing KYN61-40.5 mid-mounted switchgear has the above advantages, there are still various problems, such as...

AI Technical Summary

Problems solved by technology

Ground faults are relatively common in the operation of switchgear. After a ground fault occurs, intermittent arcing grounding may occur, resulting in an overvoltage that is several times higher than the normal voltage. This overvoltage further breaks down the insulators on the line. serious short circuit accident

At the same time, part of the distribution transformer may be burned, causing the lightning arrester and fuse insulation on the line to break down or even burn out, which may also cause a fire. A serious ground fault may destroy the stability of the regional power grid, causing greater accidents and affecting the power supply. make a large impact

Failure to eliminate the fault in time may even lead to electric shock accidents and endanger personal safety.

[0005] With the rapid development of the power grid and the continuous improvement of power supply reliability requirements, especially after the State Grid proposed to build a smart grid, the traditional periodic maintenance mode is obviously not suitable for the future development requirements of the power grid.

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