Handcart switch cabinet

Abstract

The invention relates to a handcart switch cabinet. The handcart switch cabinet comprises a body and a detection assembly, wherein the detection assembly comprises a spherical reflector and a green laser; the green laser emits a laser beam parallel to a horizontal axis of the green laser to the spherical reflector; the laser beam is reflected by the spherical reflector to form a reflection beam incident to a moving contact; and a centering condition of the moving contact and a static contact is calculated by an included angle alpha between the reflection beam and the laser beam. The handcart switch cabinet has the advantages that the green laser in the detection assembly emits the laser beam, the laser beam is reflected by the spherical reflector arranged on the static contact to form thereflection beam incident to the moving contact, the centering condition of the moving contact and the static contact is calculated by the included angle alpha between the reflection beam and the laserbeam, the centering condition of the moving contact and the static contact during operation is intuitively displayed on a display by an electronic endoscope camera, the centering condition of the moving contact and the static contact can be clearly observed, and a centering error and an error direction can be clearly observed.

Description

technical field [0001] The invention relates to a handcart switch cabinet. Background technique [0002] Handcart switchgear is widely used in the power industry, and is almost the first choice for all new power transmission and distribution equipment below 35kV. Handcart switchgear has rich functions, flexible configuration, and convenient on-site installation. Installation brings great convenience, but handcart switchgear has a relatively obvious defect, that is, internal abnormalities are not easy to find, especially problems caused by internal contact overheating, which have always been one of the important causes of switchgear equipment failures. [0003] The handcart switch cabinet uses spring-shaped plum blossom contacts or straight contacts to realize the electrical connection between some components of the handcart and the fixed parts in the cabinet. Most of the time, the spring-type plum blossom contacts or straight contacts can be realized. Good electrical contac...

AI Technical Summary

Problems solved by technology

[0002] Handcart switchgear is widely used in the power industry, and is almost the first choice for all new power transmission and distribution equipment below 35kV. Handcart switchgear has rich functions, flexible configuration, and convenient on-site installation. Installation brings great convenience, but handcart switchgear has a relatively obvious defect, that is, internal abnormalities are not easy to find, especially problems caused by internal contact overheating, which have always been one of the important causes of switchgear equipment failures

[0003] The handcart switch cabinet uses spring-shaped plum blossom contacts or straight contacts to realize the electrical connection between some components of the handcart and the fixed parts in the cabinet. Most of the time, the spring-type plum blossom contacts or straight contacts can be realized. Good electrical contact, and there is a certain degree of latitude in combination accuracy. Generally, the insertion depth or centering error will not affect the normal flow if the insertion depth or centering error is within 2-3 mm. Due to the flatness and the machining accuracy of the switchgear itself, sometimes it is difficult to ensure that the combination error between the dynamic and static contacts of the switchgear is within the standard. After putting into operation, due to the incorrect combination of the dynamic and static contacts, the contact resistance gradually increases, which eventually leads to heating and burning. Even cause the insulation breakdown of the contact box and cause a trip accident

In recent years, with the increasing number of switchgear manufacturers and the time limit requirements of on-site construction, many switchgears have problems in the combination of dynamic and static contacts during construction and installation, resulting in endless switchgear accidents in recent years, which affects the safe operation of the power grid. posed great challenges

[0004] Although the existing technology provides technologies such as optical fiber temperature measurement and surface acoustic wave wireless temperature measurement, which can prevent or monitor the contact failure of the handcart switch cabinet in the later stage, the installation cost is high and power outage construction is required. It will lead to large economic losses and user resentment. Therefore, in the civil construction stage, a solution to this problem should be developed and implemented, so as to fundamentally eliminate accidents caused by poor contact of switchgear contacts.

[0005] However, due to the special structure of the handcart switch cabinet, the view of the switch baffle and the valve baffle is blocked, even if the construction unit wants to detect and adjust the centering or insertion depth of the contact during installation, it is difficult to do it on site. They are all roughly measured by indirect methods, using the method of applying vaseline to separate and close the contacts, estimating the insertion depth by observing the oil stains of vaseline, and estimating the degree of alignment by observing the skewness of the plum blossom contacts. However, practice has proved that this indirect method test In the combined state of the contacts, the error is extremely large, especially for the plum blossom contacts with tight springs. Even if the moving and static contacts are seriously eccentric, when they are pulled out, the plum blossom contacts will appear to be slightly skewed due to the dragging effect of one side of the moving contacts. It can be seen that the existing solutions are obviously insufficient; on the other hand, in recent years, the valve baffles of the switch cabinet have been jammed, resulting in the valve not being able to be tightly closed, and accidents of maintenance personnel accidentally opening the electric shock have also occurred many times. How to install and debug in time? It is also one of the important factors to ensure the safe operation of the switchgear equipment to find out whether the opening and closing of the valve baffle is smooth and free of jamming. To solve the above problems, we have developed a method that can directly observe the internal contact combination through the switch handcart baffle. The technology of the speed and the opening and closing status of the valve baffle will bring great help to the construction quality of the handcart switch cabinet and the containment of hidden dangers of accidents after it is put into operation in the future.

Images