Application of Vacuum Circuit Breaker in Electrical Equipment Application Guo Yanjun Gao Wei (Heilongjiang Province Mudanjiang Jiangxian Heating Co., Ltd., Mudanjiang Heilongjiang 157000) Practical problems and obstacles in the application of vacuum circuit breakers in electrical equipment, resulting in a more scientific and reasonable vacuum Circuit breakers in the application of electrical equipment, establish a corresponding equipment maintenance and management mechanism to promote the continuous effective application of electrical equipment. Vacuum circuit breakers have the characteristics of strong arc extinguishing ability, long service life of electrical equipment, convenient installation and maintenance of circuit breakers, and high technological content, which have been widely applied and developed during the construction and transformation of electrical equipment systems. High-altitude circuit breakers are important equipment. However, high-altitude circuit breakers have different degrees of defects and deficiencies in the use of electrical equipment, thereby hindering the use of electrical equipment and performance, the use of electrical equipment, and the length of life. Should continue to develop and improve during the use of the corresponding technology, reasonably adjust the use of high-altitude circuit breakers to ensure the safe and smooth operation of the power system. The basic structure of a vacuum circuit breaker Vacuum circuit breaker consists of several parts of the operating mechanism, insulators and vacuum interrupter. According to the different positions of the vacuum interrupter and the operating mechanism, vacuum circuit breakers can be classified into floor-standing, integrated, suspended, bracketed, and fully enclosed. The corresponding operating mechanism in the vacuum circuit breaker can be divided into five types: electromagnetic, spring, hydraulic, pneumatic and spring hydraulic actuators. Vacuum interrupters in vacuum circuit breakers are the most important part of electrical equipment. Vacuum interrupter is mainly composed of insulation shell, shield, bellows, and static and dynamic contacts. The vacuum interrupter housing is used to support metal parts such as moving and stationary contacts and shields. In the selection of the material of the vacuum interrupter housing, strength properties such as compressive strength, tensile strength, and impact resistance should be considered, and the degree of vacuum in the arc extinguishing chamber should be ensured. Vacuum interrupter commonly used main shield, bellows shield, pressure equalizing shield. The main shielding cover surrounds the arc gap, which is to prevent the loss of metal vapor to the insulating housing performance when the current of the vacuum interrupter is at the beginning; at the same time, in order to ensure the rapid diffusion of the metal vapor in the arc extinguishing chamber when the alternating current crosses zero, the arc is increased. Gap dielectric strength improves the interrupting performance of the arc extinguishing chamber; at the same time, it also improves the insulation strength between the contacts to a certain extent and prolongs the service life of the bellows. The pressure equalizing shield is mounted near the contacts to improve the electric field between the contacts. The bellows connects the moving contact and the moving guide rod. The degree of expansion and contraction of the bellows determines the maximum opening distance of the movable contact, and at the same time can guarantee the vacuum state of the arc extinguishing chamber during the movement of the moving contact. From the perspective of mechanical design, the bellows is the most fragile element in the vacuum interrupter. The reciprocating motion of the moving and static contacts will lead to mechanical deformation of the thin bellows wall. The long-term deformation of the bellows wall will lead to the corresponding fatigue of the material. Damage, resulting in the corresponding arc chamber is difficult to maintain the vacuum state. The service life of the bellows largely determines the service life of the vacuum interrupter. The movable contact is located in the lower half of the arc extinguishing chamber, and is connected between the guide pipe and the conductive rod to ensure that the movable contact is accurately movement. 2 Application of vacuum circuit breakers in electrical equipment 2.1 Mechanical life of vacuum circuit breakers The service life of vacuum circuit breakers is an important assessment criterion for the quality of the corresponding devices. However, at present, high voltage vacuum circuit breakers in China have common quality problems, mainly vacuum. The mechanical life of the circuit breaker is difficult to meet the requirements of the enterprise standard, and the corresponding parameters in the mechanical design process also exceed the reasonable range of technical conditions. Vacuum circuit breakers are made up of hundreds of components, and the design and manufacture of each component will affect the quality of vacuum circuit breakers. There is a certain degree of dispersion in other external accessories associated with the main parts, and it is difficult to obtain complete protection of the quality. However, the use of external parts will directly affect the mechanical quality of the high-altitude circuit breakers. In the sales process of the corresponding vacuum circuit breaker products, the description of the product is prone to falsification and other exaggerated phenomena. Therefore, the company should use the actual experimental report as the judgment basis in the selection process of the vacuum circuit breaker to ensure the vacuum circuit breaker. life. The on-line monitoring of the vacuum degree in the vacuum interrupter has not formed a mature detection method, and the detection of the degree of vacuum in the arc-extinguishing chamber is still under research and development. In the application of the vacuum circuit breaker in the electrical equipment, the fracture of the vacuum interrupter is dealt with. To carry out a regular pressure test, the basis of the judgment of the strength of the insulating medium between the fractures is determined by the pressure resistance of the fracture. The decrease of the vacuum degree in the vacuum interrupter will cause the vacuum circuit breaker to discharge and breakdown between the static and dynamic contacts during the subdivision, thus seriously threatening the operation of the vacuum circuit breaker and the electrical equipment. During the inspection of the vacuum circuit breaker, the withstand voltage cycle of the fracture in the arc extinguishing chamber shall be checked and recorded, and sufficient attention shall be given to the daily use and maintenance process, so as to ensure the normal and safe use of the vacuum circuit breaker. 2.3 Setting of rated current position and short-circuit current value Vacuum circuit breaker shall set the rated current value and short-circuit current value during the selection and maintenance of the corresponding mechanical life so as to ensure the safety of the use of electrical equipment to the maximum extent. And mechanical properties. The selection of the setting range of rated current and short-circuit current should be set according to the actual capacity of the enterprise's power grid, so as to prevent the error that the larger the value of the insurance coefficient is, the better. If the rated current value is set too large, the corresponding power will be wasted. The corresponding production and operation costs of large enterprises will affect the safe use of vacuum circuit breakers and affect the service life of the corresponding mechanical equipment. 2.4 Use of vacuum circuit breaker Ambient temperature The ambient temperature of the high-voltage vacuum circuit breaker will affect the service life of the corresponding electrical equipment. Most of the product descriptions of vacuum circuit breakers assume that the operating environment is negative 30 degrees Celsius to plus 40 degrees Celsius. However, in practical applications, if the ambient temperature of the vacuum circuit breaker is low during use, the frictional force of the corresponding transmission equipment will be significantly improved. The ability of the vacuum circuit breaker to operate under normal temperature environment is difficult to meet the friction of the low temperature environment. Due to force requirements, the transmission of the corresponding equipment is difficult to place. If the circuit is opened or closed properly, the abnormality of the vacuum circuit breaker device may be caused, and even a safety accident may occur. Therefore, during the use of the vacuum circuit breaker, the temperature of the environment should be emphasized, and the corresponding parts should be tested and controlled. test. The failure of the auxiliary switch will cause the power system to be out of power or expand the range. At the same time, it may also cause the corresponding opening and closing coils to be damaged, or even cause the destruction of related equipment or the occurrence of a safety accident. A special study or conference discussion was conducted on the auxiliary switch or accident of the vacuum circuit breaker, and the operation quality of the auxiliary switch was fully emphasized. The failure of the auxiliary switch, disconnection, moisture, etc., will lead to important issues and key links in the operation and use of the vacuum circuit breaker. Vacuum circuit breaker repair and maintenance must be detailed and standardized, so as to effectively implement auxiliary switch detection and management. 3 Improve the performance of vacuum circuit breakers in the application of electrical equipment to ensure that the vacuum circuit breakers used in the environment clean vacuum circuit breakers in the electrical equipment maintenance process should ensure the degree of cleanliness of the use of machinery and equipment environment, thus ensuring the life of mechanical equipment. The dust of the arc extinguishing chamber and the insulating member should be regularly cleaned and periodically detected for damage or mechanical device discharge. Indoor vacuum circuit breakers are generally installed in closed cabinets. The heat dissipation conditions are poor, and the indoor and outdoor temperatures are very different. This affects the life and efficiency of the use of vacuum circuit breakers and should fully maintain the environment cleanliness of the corresponding equipment during use. Keep the inside of the cabinet dry for a long time. Vacuum interrupter design technology The vacuum interrupter is the key to the vacuum circuit breaker. The vacuum interrupter manufacturing technology will determine the performance of the vacuum circuit breaker to some extent. The appearance of the arc extinguishing chamber will use glass materials, which will reduce the production cost to some extent. In addition to the application of glass materials, ceramic materials have been widely used in the application of arc extinguishing outdoor surface materials. In vacuum circuit breaker design and manufacturing process can be realized (turn to page 84) LLEYllli technology R & D software is developing personalized search engine According to foreign media reports, Microsoft hopes that its new personalized search engine Emporia will enable people to access quickly Increased amount of online information. A group of five Microsoft scientists has been working on a smart search engine at Cambridge University. This search engine can learn and provide search results based on the individual needs of the user. A Microsoft manager recently demonstrated the search engine prototype to participants even at the Nextll conference in Berlin. To tell whether a project is relevant to users, the Emporia project also analyzes data published on social networks such as Twitter and Facebook. The knowledge and specific experience from these networks will become more and more important. 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Valotta said that this security breach will affect all versions of the IE browser on all Windows system versions, including Microsoft's new IE9. In order to exploit this vulnerability, hackers need to lure users to PCs before Internet Explorer cookies. Drag an object on the screen. This may sound like a difficult task, but Varota said he can easily achieve this goal. Valota set up a puzzle on Facebook and the user who answered the puzzle could see the nude photos of a beautiful woman. Valotta said: “I put this game on Facebook and it turned out to be less than 3 In days, more than 80 cookies were sent to my server, and this is my premise of having only 150 friends on Facebook.†However, Microsoft believes that the hackers have successfully used Cookie to hijack the scam in the real world. Not too big, Microsoft spokesman erry Bryant said, considering that it needs the participation of users, we think the risk of this vulnerability is not high. The user first has to visit a malicious website and then be persuaded to click and drag an object on the page so that the hackers can only steal webpage cookie files containing the user's logged-in account. "Sina Technology (continued from page 145), the arc extinguishing chamber's aging stage, experienced the possibility of using metallic vapor to achieve the removal of filaments or needles on the contact surface. On the other hand, it can achieve corresponding The evaporation of the electrode surface material causes the particles to splash and recondense, and the breakdown performance and strength of the vacuum circuit breaker are reduced from the design level, and the breakdown strength of the relevant static and dynamic contacts is improved, thereby realizing the development of vacuum circuit breaker products and Design achieves innovation and development. The insulation design of the arc extinguishing chamber is designed as a vacuum interrupter in a vacuum circuit breaker. The insulation design of the arc extinguishing chamber should be given full consideration so that the lifetime of the vacuum circuit breaker can be fully ensured. In the design process of the vacuum interrupter, dynamic and static contact should be achieved. The insulation design between the heads, the insulation design between the conductive rods and the shield, and the design of the insulation along the surface and the outside. The insulation design of the vacuum circuit breaker will largely determine the safety and performance of the corresponding mechanical equipment operation. The design between the insulation performance of the dynamic and static contacts will seriously affect the performance of the vacuum circuit breaker's power supply breaking, and the conductive rod and The design of the shape and size between the shield shells will have a great influence on the insulation performance. The insulation along the surface and the external insulation design will affect the even distribution of the electric field in the mechanical equipment. The insulation design of the arc extinguishing chamber has a significant impact on the safety performance of the vacuum circuit breaker. The material of the contactor of the vacuum circuit breaker has a great influence on the breaking characteristics of the arc extinguishing chamber. The selection of good contact materials provides a good basis for the quality and performance of the vacuum circuit breaker. The contact material in the arc extinguishing chamber should have the characteristics of strong breaking resistance, high anti-ablative ability and low level of interception, and can guarantee the degree of vacuum of the arc extinguishing chamber. Vacuum breaker material selection can be a reasonable innovation. The new development of contact materials is the addition of vanadium to the alloy, which reduces the possibility of breakdown between contacts and improves the high voltage environment of the vacuum interrupter. The quality and service life of the vacuum interrupter should start with the design details of the corresponding parts and components. , to establish a better performance vacuum circuit breaker equipment. Black Pom Rod,Black Delrin Rod,Black Acetal Rod,Acetal Round Bar Ningbo Zero Engineering Plastics Co.,Ltd , https://www.zero-peek.com