Direct current switch contact wear and tear aging fault alarm system

Abstract

This utility model relates to a DC switch contact wear and aging fault alarm system, including a stationary contact, a moving contact mechanism, an electromagnetic actuator, and a shock absorption mechanism. The moving contact mechanism comprises a moving contact seamlessly connected to the stationary contact at its upper part, an L-shaped bracket, a closing device, a transmission rod component, a shift fork, and a laser rangefinder. The L-shaped bracket consists of a fixed frame, a longitudinal rod, and a transverse inlet conductor perpendicularly connected to the longitudinal rod. The moving contact and the electromagnetic actuator are mounted on the transverse inlet conductor. A U-shaped mounting groove is provided at the right end of the closing device, and the laser rangefinder is mounted at the end of the U-shaped mounting groove. The transmission rod passes through the closing device, with its right end corresponding to the laser rangefinder at intervals, and its left end fixedly connected to the shift fork. The other end of the shift fork is engaged with the upper part of the magnetic actuator, forming a linkage mechanism for the moving contact. Its advantages are: it can conveniently monitor the burn-off changes of the moving and stationary contacts, preventing DC switch contact burn-off faults.

Description

Technical Field

[0001] This utility model belongs to the field of DC switchgear technology, specifically relating to a fault alarm system for DC switch contact wear and aging. Background Technology

[0002] In the DC power supply system of the substation, the main fault in the operation of the switch is the wear of the switch contacts. Directly shutting down the power to repair the switch will inevitably affect the operation of the locomotive. After a certain period of operation, the switch needs to be shut down to check the wear of the switch contacts. The switch is in a closed high-voltage cabinet, and it is impossible to detect the wear of the switch contacts. The contact condition of the moving contacts and the clamping force of the shock-absorbing springs are not checked, tested and maintained for a long time, which causes serious faults and directly affects production. Utility Model Content

[0003] The purpose of this invention is to provide a DC switch contact wear and aging fault alarm system that can detect the contact state of the stationary and moving contacts of the switch.

[0004] This utility model is implemented as follows.

[0005] This utility model discloses a DC switch contact wear and aging fault alarm system, comprising a stationary contact, a moving contact mechanism, an electromagnetic actuator, and a shock absorption mechanism. The moving contact mechanism includes a moving contact, an L-shaped support body, a closing device, a transmission rod component, a shift fork, and a laser rangefinder. The upper part of the moving contact is seamlessly connected to the stationary contact. A shaft hole is formed in the center of the moving contact. The L-shaped support body consists of a fixed frame, a longitudinal rod, and a transverse inlet conductor perpendicularly connected to the longitudinal rod. A pin passes through the shaft hole of the moving contact and is hinged to the transverse inlet conductor of the L-shaped support body. The electromagnetic actuator is fixed in the middle of the transverse inlet conductor and is located on the left side of the moving contact. The magnetic actuator has an annular groove at its top, and a through hole is horizontally opened inside the closing device. A U-shaped mounting groove is provided at the right end of the closing device, and the laser rangefinder is installed at the end of the U-shaped mounting groove. A thread is opened at the right end of the transmission rod, and a screw is provided at the thread for fastening, forming a closing probe of a laser displacement sensor. The transmission rod passes through the through hole on the closing device, and the closing probe end of the transmission rod extends horizontally from the right side of the closing device and is spaced corresponding to the laser rangefinder. The left end of the transmission rod extends from the left side of the closing device. One end of the shift fork is fixedly connected to the left end of the transmission rod, and the other end is inserted into the annular groove of the magnetic actuator, forming a linkage mechanism of the moving contact.

[0006] The shock absorption mechanism is located at the lower part of the moving contact and includes a shock absorber, an arc extinguishing cover, and an auxiliary contact. The shock absorber and the arc extinguishing cover are respectively in contact with the lower part of the moving contact.

[0007] The distance between the laser rangefinder and the closing probe is set to be 36.12mm-11.12mm.

[0008] The advantages of this utility model are: the DC switch contact wear and aging fault alarm system of this utility model can conveniently monitor the changes in the burning of the moving contact and the stationary contact. The monitoring signal is transmitted to the high voltage controller through the laser rangefinder. The distance data between the moving contact and the stationary contact is observed through the controller panel to see if it is within the set range. Once the limit is exceeded, the fault alarm function is activated to prompt the replacement of the contact, eliminate the hidden danger in time, and avoid the occurrence of DC switch contact overheating and burning faults. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Figure 2 This is a structural diagram of the stationary contact in a state of no wear.

[0011] Figure 3 This is a structural diagram showing the wear state of the stationary contact. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] like Figures 1-3As shown, this utility model discloses a DC switch contact wear and aging fault alarm system, comprising a stationary contact, a moving contact mechanism, an electromagnetic actuator 3, and a shock absorption mechanism 4. The moving contact mechanism includes a moving contact 21, an L-shaped support body, a closing device 24, a transmission rod component 23, a shift fork 28, and a laser rangefinder 27. The upper part of the moving contact 21 is seamlessly connected to the stationary contact 1. The L-shaped support body consists of a fixed frame 221, a longitudinal rod 222, and a transverse inlet conductor 223 perpendicularly connected to the longitudinal rod. A pin passes through the shaft hole 211 of the moving contact 21 and is hinged to the transverse inlet conductor 223 of the L-shaped support body, forming a closing / closing circuit with the stationary contact mounted on the output conductor 11. The electromagnetic actuator 3 is fixed in the middle of the transverse inlet conductor 223 and is located on the left side of the moving contact 21. The top of the magnetic actuator 3 is provided with an annular groove. A shaft hole 211 is formed in the center of the moving contact 21. A U-shaped mounting groove 26 is provided at the right end of the closing device 24. A through hole 241 is formed laterally within the closing device. The laser rangefinder 27 is installed at the end of the U-shaped mounting groove 26. An internal thread is formed at one end of the transmission rod 23, and a screw is provided at the thread for fastening, forming a closing probe 25 for a laser displacement sensor. The transmission rod 23 passes through the through hole 241 on the closing device 24. The end of the closing probe 25 extends laterally from the right side of the closing device 24 and is spaced corresponding to the laser rangefinder 27. The left end of the transmission rod extends from the left side of the closing device 24. One end of the fork 28 is fixedly connected to the left end of the transmission rod 23, and the other end is inserted into the annular groove of the magnetic actuator 3 (not shown in the figure), forming a linkage mechanism for the moving contact. This ensures that the stationary contact and the moving contact can be properly connected.

[0014] In this embodiment, to improve the reliability of the DC switch contact wear and aging fault alarm system, the shock absorption mechanism is located at the lower part of the moving contact 21, including a shock absorber 291, an arc-extinguishing cover 292, and an auxiliary contact 293. The shock absorber 291 and the arc-extinguishing cover 292 are respectively in contact with the lower part of the moving contact. This reduces the bounce of the moving contact 21 when closing, and the structure is simple and compact, with high reliability and strong contact breaking capacity.

[0015] In this embodiment, the distance between the laser rangefinder 27 and the closing probe 25 is set to 36.12mm-11.12mm. The laser displacement rangefinder used is a GFL-Z30N model. When the switch is closed or opened, the distance between the sensor and the probe is adjusted between 11.12mm and 36.12mm. After being burned by arcing due to high current, the contact surface of the moving and stationary contacts will thin from 12mm to 7mm, shortening the exposed length of the closing probe 25 in the linkage mechanism. When the distance exceeds 36.12mm, an alarm is triggered, prompting the replacement of the contacts.

Claims

1. A DC switch contact wear and aging fault alarm system, comprising a stationary contact, a moving contact mechanism, an electromagnetic actuator, and a shock absorption mechanism, characterized in that: The moving contact mechanism includes a moving contact, an L-shaped support body, a closing device, a transmission rod component, a shift fork, and a laser rangefinder. The upper part of the moving contact is seamlessly connected to the stationary contact. A shaft hole is opened in the middle of the moving contact. The L-shaped support is composed of a fixed frame, a longitudinal rod, and a transverse inlet conductor perpendicularly connected to the longitudinal rod. A pin passes through the shaft hole of the moving contact and is hinged to the transverse inlet conductor of the L-shaped support. The electromagnetic actuator is fixed in the middle of the transverse inlet conductor and is located on the left side of the moving contact. An annular groove is provided on the top of the electromagnetic actuator. A transverse through hole is opened in the closing device. The closing device has a U-shaped mounting groove on its right end, and the laser rangefinder is installed at the end of the U-shaped mounting groove. The right end of the transmission rod has a thread, and a screw is provided at the thread to fasten it, forming a closing probe of a laser displacement sensor. The transmission rod passes through the through hole on the closing device, and the closing probe end of the transmission rod extends laterally from the right side of the closing device and is set at intervals with the laser rangefinder. The left end of the transmission rod extends from the left side of the closing device. One end of the shift fork is fixedly connected to the left end of the transmission rod, and the other end is inserted into the annular slot of the magnetic actuator to form a linkage mechanism of the moving contact.

2. The DC switch contact wear and aging fault alarm system according to claim 1, characterized in that: It includes a shock absorber, an arc-extinguishing cover, and an auxiliary contact, wherein the shock absorber and the arc-extinguishing cover are respectively connected to the lower part of the moving contact.

3. The DC switch contact wear and aging fault alarm system according to claim 1, characterized in that: The distance between the laser rangefinder and the closing probe is set to be 11.12mm-36.12mm.

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