Distribution-circuit intermediate protection integrated device

Abstract

A distributed-circuit intermediate protection integrated device comprises an incoming line terminal, an incoming line side lightening arrester, a fuse protector, a multifunctional power meter, a current transformer, a current terminal row, a residual current operated circuit-breaker, a common-compensation capacitor switch, a self-healing power capacitor, an outgoing line side lightening arrester and an outgoing line terminal which are all installed in a stainless steel box in sequence. The distribution-circuit intermediate protection integrated device is installed on a low-voltage distribution circuit between distribution unit-area overall protection and household protection, the fault point can be isolated once ground fault occurs to a certain branch circuit, failure outage to other circuits never occurs, and power supply continuity and reliability of residential users is guaranteed; the device has a lightning protection function, an electric leakage protection function, and meter, voltage, current and power factor measurement and reactive local compensation functions; overlapping investment can be avoided, and the distribution-circuit intermediate protection integrated device is timesaving, laborsaving, safe and high in operation efficiency.

Description

technical field [0001] The invention relates to a comprehensive device for mid-level protection of power distribution lines used in power systems. Background technique [0002] After the reform of the rural electricity system, since the property rights and maintenance and management responsibilities of rural power supply lines were transferred to the power supply enterprises for management, the safety management of power supply and use was very passive. With the development of society, enterprises and residential users have put forward higher and higher requirements for the continuity of power supply and the safety management level of power equipment. In recent years, power supply companies have made great efforts to strengthen the safety management of rural electricity use, such as implementing measures such as "strengthening the foundation" project for rural electricity use safety. As the power supply department, how to ensure the safety of users' electrici...

AI Technical Summary

Problems solved by technology

At present, there are two levels of leakage protection for rural power distribution lines, the general protection of the station area and the household protection (user side). Once the leakage of the line above the household protection occurs, it will directly impact the general protection of the station area, causing a power outage in the entire station area, and the power supply of residential users cannot be guaranteed. Continuity and reliability have brought a lot of inconvenience to users. It is very important to install an intermediate protection comprehensive device between the general insurance of the distribution line and the household insurance.

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