Three-incoming line two-connection electrical interlocking system for power distribution system

Abstract

The invention provides a three-incoming line two-connection electrical interlocking system for a power distribution system. A closing locking relationship needed by each switching device in a system is firstly analyzed, the relationship is added to a control circuit by using a series-parallel connection combination of auxiliary contacts of each switching device or added to a control program by using a logic combination of switching device on and off state signals inputted to automatic control equipment, and thus, incoming line connection switching device interlocking control is realized. As the auxiliary contacts of the switching device or the input signals inputted to the automatic control equipment are changed by opening and closing operation of the switching device, the change combination is added to the control circuit or the control program of the switching device to achieve the purpose of automatic locking or unlocking.

Description

technical field [0001] The invention relates to the technical field of electrical control, in particular to a three-inlet two-connection electrical interlocking system for a power distribution system. Background technique [0002] According to the classification of power users, the power supply reliability requirements of different levels of user power distribution systems are different. The number of incoming power supplies is an important way to ensure the reliability of power supply. At present, in the design scheme of power distribution systems, there are mainly single power supply incoming lines, Two-way power incoming lines, three-way power incoming lines, four-way power incoming lines, etc. For the design scheme of two or more power supply lines, if there is no need for parallel operation of the power supplies, an interlock of the line contact switch should be set. The function of the interlock of the incoming contact switch of the power distribution system is mainly...

AI Technical Summary

Problems solved by technology

There are mainly three methods of mechanical interlocking: lever, cable, and key. At present, the interlocking of lever and cable can only be carried out between three switches at most, and it is greatly limited by the installation method and distance of the switchgear. Generally, between three switches The use of these two mechanical interlocks has not been considered for interlocking; although key interlocking is not affected by the distance and installation method of the switchgear, it requires the design of complex logic for the number of locks and keys and the installation position (the more switches involved more complex), and in today's development of automation, because the key interlock requires manual intervention (opening, closing), it is not suitable for various control modes such as automatic switching and remote control

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