Low voltage loop-closing selective-tripping system

Abstract

The invention provides a low voltage loop-closing selective-tripping system, comprising auxiliary connection points of three air switches, a relay and a selective-tripping switch, wherein the relay comprises three normally open contacts; the selective-tripping switch comprises three groups of connection points, and moreover, only one group of connection points is located in the on-state; the auxiliary connection points of the three air switches are connected in series in order; the auxiliary connection point of the first air switch is connected with a live wire of a power supply source; the auxiliary connection point of the third air switch is connected in series with the first end of a coil of the relay; the second end of the coil of the relay is connected with a neutral wire of the power supply source; the three normally open contacts of the relay are connected with three input connection points in the three groups of connection points of the selective-tripping switch respectively; and three output connection points in the three groups of connection points of the selective-tripping switch are connected with opening coils of three opening loops of the three air switches respectively. With the adoption of the low voltage loop-closing selective-tripping system, the problem of voltage flicker of momentary interruption during the switching operation can be solved; the power can be supplied reliably; and the personal safety of operators can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of power supply, in particular to a low-voltage ring closing and jumping system. Background technique [0002] At present, there are many high-voltage users with dual power supplies and multiple power supplies, and these users have high requirements on the reliability and quality of power supply. figure 1 Shown is the main wiring diagram of the dual power supply system in the form of sub-section wiring of medium and low voltage single bus bars in the prior art, including the first air switch QF1, the second air switch QF2 and the third air switch QF3, of which the first The first air switch QF1 and the second air switch QF2 are incoming line switches respectively, and the third air switch QF3 is a bus tie switch. During the switching operation of the dual power supply system, the voltage flicker of the user's busbar voltage will occur instantaneous power failure. The voltage flicker of instantaneous power ...

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a low-voltage ring closing and tripping system to solve the problem of voltage flicker caused by instantaneous power failure during the switching operation through the short-term contact between the high-voltage side and the low-voltage side in the prior art, resulting in unreliable The problem of power supply and the personal safety of operators cannot be guaranteed

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