High-voltage vacuum circuit breakers to have a good arc-extinguishing characteristics, suitable for frequent operation, do not overhaul the advantages of long cycle times, in today's power industry in rural and urban power grids, chemical, metallurgy, railway electrification and mining industries have been widely used by Ubiquitous use of the department.
The use of vacuum circuit breakers mainly refers to the vacuum interrupter, but its non-overhaul cycle characteristics does not mean that does not mean maintenance and maintenance-free. For the vacuum circuit breaker as a whole, the vacuum interrupter is only a component, such as the operating mechanism, transmission mechanism, insulation, etc., is still to ensure the technical performance of vacuum circuit breakers an important part. For the normal maintenance of each component, in order to achieve the use of vacuum circuit breakers is very necessary.
1 vacuum circuit breaker installation requirements
Vacuum circuit breakers in the factory did not promise, the use of routine routine routine inspection is necessary, as far as possible to avoid blind self-confidence.
(1) Appearance and internal inspection of vacuum circuit breaker before installation, vacuum interrupter, all components and components shall be complete, qualified, nondestructive and free of foreign matter;
(2) Strict implementation of the installation process requirements, the various components of the fastener specifications must be selected according to the design requirements;
(3) check the distance between the electrodes, the location of the upper and lower outlet must comply with the relevant professional and technical requirements;
(4) The tools used must be clean and meet the assembly requirements, fasten the screws around the interrupter, do not use live wrenches;
(5) The rotation, the slider should be free to move, exercise friction should smear grease;
(6) The overall installation and commissioning should be cleaned and wiped clean, adjustable parts of the parts are applied red paint RBI mark, the outlet terminal should be coated with anti-corrosion grease.
2 in use for vacuum circuit breaker mechanical properties of the adjustment
In general, the vacuum circuit breaker in the factory debugging, for its mechanical properties such as open distance, stroke, contact stroke, three-phase, closing time, speed and so on were more complete debugging, and comes with commissioning records. Generally in use in the field only three on the same period, closing speed and closing bounce slightly adjusted qualified, that is, with the commissioning conditions.
(1) Three-phase adjustment:
Aiming at the phase where the maximum difference between the opening and closing of the switch is large, if the switch is closed too early or too late, slightly adjust the opening of the pole or adjust the small point. Simply adjust the pole of the extremely insulated rod Rotary joints screwed or unscrewed half a circle, the general can be adjusted to make, sub-gate within the period of less than 1mm, access to the ideal value of the same period the best value.
(2), closing speed adjustment:
The speed of closing and opening is affected by many factors, and the parts that can be adjusted on the use site are only the opening springs and contact travel. The tightness of the opening spring has a direct influence on the closing speed and opening speed. The contact stroke (referring to the amount of compression of the contact pressure spring) has a major influence on the opening speed. If the closing speed is high and the opening speed is low, the contact stroke can be slightly increased, or the spring can be tapped a little; on the contrary, some loose. If the closing speed is more appropriate, and the opening speed is low, you can adjust the total travel to increase 0.1 ~ 0.2mm, contact exposure at all levels are increased by 0.1 ~ 0.2mm or so. The opening speed will rise; the other hand, when the opening speed is too high, the contact stroke can also be reduced 0.1 ~ 0.2mm, the opening speed will be reduced.
When the completion of the same three-phase and together, the opening speed adjustment, remember to re-open each pole distance and contact travel measurement and correction, and should be consistent with the relevant provisions of vacuum circuit breaker products.
(3) the closing bounce elimination:
Vacuum circuit breakers ubiquitous contact closing process bounce problem. Analysis of the main reasons for its production: First, the impact of the switch is too rigid, resulting in axial movement of the first contact; Second, moving the poor guide, shaking too large; Third, the transmission gap is too large; Fourth, the contact plane Poor verticality with the central axis, resulting in colliding with the lateral slide and so on.
For the products that have been formed, the rigid structure of the whole machine is a foregone conclusion and the scene can not be changed generally. For moving the poor guidance of the rod, in the coaxial structure, the contact pressure spring and the conductive rod is directly connected, there is no intermediate transmission, so there is no gap. For the vacuum circuit breaker with different axial structure, there is a steering triangle gear arm between the contact spring and the movable contact rod, which is connected by three pins. There are three gaps, which are easy to happen when closing. This is the key to eliminating bouncing. At the same time, attention should be paid to the adjustment of the transmission gap between the initial pressure terminal of the contact spring and the conductive rod so as to make the transmission link as compact as possible without buffer gaps. If the vertical contact of the contact surface of the interrupter is bouncing, Interrupter were rotated 90 °, 180 °, 270 ° installation, find the upper and lower contact surface anastomosis, it does not work when you need to replace the interrupter.
In the process of closing the bounce, remember to tighten all the screws so as not to be chattering.
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