Mobile substation outlet protection circuit

Abstract

The invention provides a mobile substation outlet protection circuit which comprises an input end, an inductive switch, a high-voltage power grid comprehensive protector, an auxiliary switch FK1, a DC tripping coil TQ and a relay, wherein the input end, the auxiliary switch FK1 and the DC tripping coil TQ are connected in series and then are connected to a first pin ZB10 and a second pin ZB20 of the high-voltage power grid comprehensive protector; the relay Z controls a group of normally closed contacts Z1; the inductive switch comprises an external normally closed contact J2; the external normally closed contact J2 is connected with the relay Z in series and then connected with the input end in parallel; and two ends of each normally closed contact Z1 of the relay Z are connected with the first pin ZB10 and the second pin ZB20 respectively. According to the technical scheme, one group of outlet tripping normally closed contacts are added under the premise of not affecting the original electric property, protection function and flameproof property of the mobile substation, the mobile substation outputs two pairs of tripping outlet contacts (normally open and normally closed) after transformation, and the proper contact can be selected from the two pairs of tripping outlet contacts for outlet tripping, so that power utilization units are greatly facilitated.

Description

technical field [0001] The invention relates to a circuit of a mobile substation, in particular to an outlet protection circuit of a mobile substation. Background technique [0002] The mobile substation is a kind of electrical equipment with excellent performance, safety and reliability, which is specially designed to provide power supply for long-distance underground working faces, integrating high and low voltage and transformers. [0003] In the existing technology, such as Figure 1-2 As mentioned above, the mobile substation outlet protection circuit includes an input terminal, an induction switch, a high-voltage power grid comprehensive protection circuit, an auxiliary switch FK1, and a DC trip coil TQ. The first pin ZB10 and the second pin ZB20 of the protector also include a capacitor C1 and a capacitor C2, the capacitor C1 is connected in parallel with the input end, and the capacitor C2 is connected in parallel with the DC tripping coil TQ. The induction switch i...

AI Technical Summary

Problems solved by technology

The protection outlet of the existing mobile substation only has a pair of normally open contacts J3, which cannot satisfy the function of locking various low-voltage switches (some switches require a pair of normally closed points)

Therefore, only a certain type of switch can be used in the preparation of transmission and distribution lines.

Images