With the rapid increase in the use of vacuum circuit breakers, the vacuum circuit breaker failure rate has also increased. According to the statistics of the state of the power system switchgear, the ratio of breaking and closing of vacuum circuit breakers is relatively high compared to other types of circuit breakers. The problem is mainly in the arc extinguishers, and the leakage of the arc extinguishers and the lack of vacuum are the main factors. the reason. In vacuum circuit breaker components, the vacuum interrupter is a non-repairable component, and the arc extinguishing chamber is broken and can only be replaced as a whole. In order to ensure the safe and reliable operation of the vacuum circuit breaker, it is necessary to attach great importance to the judgment and determination of the vacuum degree of the vacuum interrupter. (1) Strictly control the selection of vacuum circuit breakers, vacuum interrupters, and plant selection. Selecting a stable, reliable product is the basis for improving the operational reliability of vacuum circuit breakers. (2) Some routine detection methods, such as observation method, AC voltage withstand method, spark meter method, etc., are the most basic methods for qualitative testing of vacuum degree, and in particular, AC voltage withstand method is a regular inspection method stipulated by regulations of the electric power department. The circuit breaker user must carry out the inspection work according to the regulations. (3) For users who use a large number of vacuum circuit breakers, they should use a reliable vacuum tester to test the vacuum degree. At present, some regional, provincial, and municipal electric power companies such as North China Electric Power Group Corporation, Jiangsu Provincial Electric Power Corporation, and Sichuan Provincial Electric Power Company have all clearly required or actively promoted the vacuum of arc extinguishers for vacuum circuit breakers in their respective high voltage switch professional work. Degree test. (4) When purchasing home-made vacuum testing instruments, it is necessary to select the products whose performance and quality meet the requirements of users, so as to avoid the negative influence caused by the misjudgment of vacuum degree. For the vacuum degree determination work, a corresponding management method shall be established and the vacuum test shall be conducted under the following conditions: before the new equipment is put into operation; after the specified maintenance pre-test working period; after the vacuum circuit breaker has opened the specified number of fault currents; After the specified number of breaking load currents and mechanical life; when abnormal conditions are found during operation. When the vacuum degree does not meet the requirements, the vacuum arc extinguish chamber should be replaced in time when it is lower than or close to 6.6×10-2 Pa. For a vacuum interrupter whose vacuum degree is greatly reduced but still within the acceptable range, The test cycle should be appropriately shortened, combined with previous measurement data analysis to determine the downward trend in vacuum, and it is determined whether the vacuum interrupter continues to operate. (5) For spare parts of vacuum arc extinguishers purchased, vacuum test shall be conducted before the products are put into storage and use to prevent unqualified vacuum interrupters from being put into operation.
An air heat exchanger is a device that is used to transfer heat between two air streams. It is commonly used in heating, ventilation, and air conditioning (HVAC) systems. The heat exchanger can be designed to allow the two air streams to be either separately or together.
Generally, we classify the air heat exchanger into Finned Tube Heat Exchanger, Plate Type Air Heat Exchanger, Seamless Pipe Air Heat Exchanger, Twisted Heat Exchanger, etc. according to its structure.
Air heat exchangers are commonly used for a variety of applications in the HVAC system, such as space heating, cooling, humidification and air circulation. In space heating applications, air heat exchangers are used to transfer heat from outside air to indoor air, in order to provide heat for the building. In cooling and air circulation applications, air heat exchangers are used to transfer heat from an indoor space to the outside. in order to keep the building cool.
The main advantage of using an air heat exchanger is that it is very efficient in transferring heat energy between the two streams without any loss. It is also relatively inexpensive, compared to other types of heat exchangers. Additionally, air heat exchangers are small and compact, making them ideal for applications in tight spaces.
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Research and Analysis on Safe and Reliable Operation of Vacuum Circuit Breaker
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