Contactor vacuum tube air leakage and contact abrasion online monitoring device and method

Abstract

The invention relates to a contactor vacuum tube air leakage and contact wear online monitoring device and monitoring method, the device comprises an electromagnet, an overtravel spring, a counterforce spring and a miniature tension and pressure sensor, the miniature tension and pressure sensor is fixed between the electromagnet and a vacuum tube, and the monitoring method comprises air leakage monitoring and locking and wear monitoring and locking. The miniature tension and pressure sensor is installed to test the change condition of the self-closing force of the vacuum tube, analyze and judge whether the vacuum tube leaks air or not, realize air leakage locking and ensure safe and reliable power supply; by installing the miniature tension and pressure sensor, the pressure change of the rated contact is tested, the abrasion degree of the vacuum tube is judged and analyzed, contact abrasion protection is achieved, reminding is conducted, and power supply safety and reliability are guaranteed.

Description

Technical field: [0001] The invention relates to the technical field of coal mine monitoring, in particular to an online monitoring device for vacuum tube leakage and contact wear of a contactor, and an online monitoring method using the online monitoring device. Background technique: [0002] With the development of power supply and distribution components technology, the operating status of vacuum contactor is the key device to ensure safe and reliable power supply, and the research on fault diagnosis and pre-judgment of contactor is quite necessary. The vacuum tube of the vacuum contactor (also known as vacuum tube or vacuum interrupter) will cause its bellows to fatigue and rupture when it is frequently attracted and released, and the ceramic bottle of the vacuum tube will be broken by collision or severe vibration, which will cause the air leakage problem of the vacuum tube . Vacuum contactors are frequently operated devices. The normal breaking and closing currents ar...

AI Technical Summary

Problems solved by technology

If there is a problem during the manual detection interval, it cannot be detected. At this time, closing the switch will cause a violent arc to burn. The hot arc can cause gas explosions and damage electrical equipment. The hot arc breaks through the flameproof cavity, which may cause Explosions in mines can affect the normal production underground in mild cases, and even affect the life safety of mines and miners in severe cases.

The tension relay is connected in series between the moving contact of the vacuum tube and the electromagnetic mechanism. When the vacuum tube is disconnected, the pulling force of the tension relay is manually adjusted to a certain value less than the vacuum negative pressure. When the vacuum tube leaks completely, the vacuum negative pressure disappears. The tension relay prevents closing. This method requires repeated manual adjustment of the action tension and cannot detect contact wear. It has been basically eliminated.

The AC withstand voltage method and the magnetron discharge method are both offline detection methods, and cannot detect contact wear

[0003] With the development of mining contactors, the faults of contactors are still mainly concentrated in the vacuum tube and the driving mechanism. There are two main mechanisms in the current product, one is the traditional integrated mechanism, which drives the rocker mechanism through the electromagnet to attract the vacuum tube; Another new type of three-phase independent mechanism uses three sets of electromagnets to attract and close three vacuum tubes respectively; the application of the two mechanisms to the online diagnosis of vacuum tube leakage and contact wear is relatively small, and with the long-term distribution of the contactor close, the aging of the mechanical mechanism; secondary damage to the welding seam of the vacuum tube, resulting in air leakage of the vacuum tube, and the separation and closing of high voltage and high current, arcing and collision between the dynamic and static contacts will cause wear between the dynamic and static contacts; through the detection of the vacuum tube self- It is necessary to judge the life of the contactor and the degree of damage based on the change of closing force and the degree of wear of the contact

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