A three-position isolating switch

Abstract

The invention discloses a three-station isolating switch which comprises a rack, disconnecting links, fixed contacts, grounding contacts and an operating mechanism. The rack is connected with a rotating shaft in a pivotal mode, and the rotating shaft drives the disconnecting links to rotate through first connecting levers and insulating pull rods. The operating mechanism comprises a shell, the shell is connected with a first operating shaft and a second operating shaft in a pivotal mode, and the first operating shaft is fixedly connected with the rotating shaft. The first operating shaft is fixedly connected with a first gear and an isolating limiting plate. The isolating limiting plate is provided with a first positioning hinge pin in a penetrating mode, and the two ends of the first position hinge pin are connected with the first operating shaft through two tension springs. The shell is provided with a switching-on groove, a switching-off groove and grounding grooves which are matched with the first positioning hinge pin. The second operating shaft is fixedly connected with a second gear and a connecting lever, wherein the connecting lever is connected with the shell through a second positioning hinge pin and a compression spring. The shell is provided with a second arc hole which is matched with the second positioning hinge pin. The second gear is not matched with the first gear in a switching-on state and a switching-off state and is matched with the first gear in a grounding state. The three-station isolating switch is compact in structure, reliable in action and convenient to maintain.

Description

technical field [0001] The invention relates to a three-position isolating switch. Background technique [0002] In the power distribution system, the three-position isolating switch is usually used in the switch cabinet. The three-position isolating switch refers to the isolating switch that can realize the three functions of closing, opening and grounding. In the structure of the isolating switch, the three functions of closing, opening and grounding are realized through the rotation of the knife switch. Usually, one end of the knife switch is connected to the static contact of the isolating switch, and the rotation of the knife switch is completed by an operating mechanism. , The operational reliability of the operating mechanism directly affects the performance and operational safety of the isolating switch. At the same time, the operating mechanism is the place where failures often occur in the three-position isolating switch. The maintenance performance of the operatin...

AI Technical Summary

Problems solved by technology

In the structure of the isolating switch, the three functions of closing, opening and grounding are realized through the rotation of the knife switch. Usually, one end of the knife switch is connected to the static contact of the isolating switch, and the rotation of the knife switch is completed by an operating mechanism. , the operational reliability of the operating mechanism directly affects the performance and operational safety of the isolating switch. At the same time, the operating mechanism is the place where failures often occur in the three-position isolating switch. The maintenance performance of the operating mechanism will affect the power failure time of the line

The traditional operating mechanism usually adopts manual operation, which is difficult to realize circuit operation, and the operation reliability and maintenance performance need to be improved

[0003] On July 04, 2012, an application for invention with the application number 201110439906.X and the name "A Three-Position Switch Operating Mechanism" was published, which can realize manual and electric operation, but it requires the use of electromagnetic clutches, screw rods Transmission mechanism, gear transmission mechanism and other components have complex structures and high manufacturing costs. At the same time, due to the large number of components, the reliability of the action needs to be further improved

[0004] In addition, the connection structure between the knife switch and the static contact will directly affect the current that the knife switch can pass and the degree of heat generated at the joint between the knife switch and the static contact. If the two splints of the knife switch are in poor contact with the static contact, it is easy An arc is generated at the connection between the two to damage the knife switch and the static contact, reducing the service life of the knife switch and the static contact, and affecting the service life of the entire isolating switch

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