Overcurrent protection relay

Abstract

The invention discloses an overcurrent protection relay and relates to the technology field of relays. The relay comprises a relay main body, a plurality of groups of wiring grooves are arranged at the right end of the relay main body in the front-back direction, and openings of the wiring grooves are equipped with first annular grooves. The relay also comprises a connector, a guide sleeve, and alimiting mechanism. The connector is detachably connected with the relay main body; an inner box body is arranged at the inner upper part of the connector; a piston is movably connected in the inner box body in a sealing manner; a damp expansion piece is placed in the inner box body at the top of the piston; the guide sleeve penetrates through the connector and is fixedly connected with the connector; conductive sleeves matched with the wiring grooves are fixedly connected to the left end of the guide sleeve, a second annular rod is arranged at the right end of the guide sleeve, a third annular groove is formed in the inner wall of the second annular rod, a second annular air bag is arranged in the third annular groove, and the limiting mechanism comprises a vertical rod, a connecting rodand a pressing plate. The relay can be used in an environment with large moisture, and short circuit or poor contact of the relay caused by external moisture can be effectively avoided.

Description

technical field [0001] The invention relates to the technical field of relays, in particular to an overcurrent protection relay. Background technique [0002] Over-current protection relay: The currently better over-current protection relay can integrate protection, single-phase current measurement, and control functions, and realize data sharing and remote control with the remote host through the in-com interface, and through the in-con interface Realize the data sharing and remote control function with the remote host computer. Focusing on its protection functions, it can be generally summarized as phase elements and grounding elements: inverse time overcurrent protection, short time delay protection, overcurrent protection when instantaneous current transformer ratio is turned, overload alarm, and regional interlock. Its own perfect self-inspection function ensures that the device provides reliable protection for primary equipment; after retrieval, the patent application...

AI Technical Summary

Problems solved by technology

[0003] It can be known from this that when the existing overcurrent protection relay is connected to the line, the wiring hole communicates with the outside world, and the airtightness is poor. When the overcurrent protection relay is in a humid environment, it is easy to be damaged by the external moisture. short circuit or poor contact, which will affect the service life of the relay, poor practicability and poor safety

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