Permanent magnet technology in the Medium Voltage Vacuum Circuit Breaker Application
Vacuum circuit breaker in the power system more widely used for high reliability, more and more in-depth study of circuit breakers. The continuous development of computer technology, intelligent control technology and permanent magnet technology, this study provides strong technical support. The resulting permanent magnet operating mechanism, then the study of philosophy has brought about a tremendous impact.
Power system right switching equipment requirements
High-reliability power system of switching devices have an integrated, all-inclusive, systematic requirements, the core is to increase operational safety and movement of equipment reliability. It includes breaking performance, high reliability, mechanical operating performance of high reliability, insulation performance, high reliability, environmental tolerance of the high reliability and the second control part of the high reliability.
Performance can improve security by strengthening the capacity of arc-quenching system and insulation levels, to improve the operating environment or the protection level and the second part of the redundancy protection design implementation, and to improve the reliability of body movements are difficult to resolve. Involves not only the reliability of body mechanics, mechanics, materials science, electrical engineering, electromagnetic fields, but also the ambient temperature, humidity, corrosive gases and other factors.
The advantages of permanent magnetic actuator vacuum circuit breaker
Permanent magnetic actuator and vacuum interrupter vacuum circuit breaker can be any good, small size, light weight, not only easy to install and can save a lot of the framework for the user fee and installation fee. Compact control unit can be a wireless remote control, achieve the control switch within 100 meters of the division and functional expansion of convenient mode of operation and flexible, and easy to implement distribution automation. Permanent magnetic actuator vacuum circuit breaker with a vacuum circuit breaker spring body all of the functions. At the same time, it can also design a new synchronous switch (phase selection switch) to effectively solve the spring as well as institutional vacuum circuit breaker can not solve problems.
Vacuum Circuit Breaker Switching to solve large-capacity capacitor generated when the operation over-voltage and surge problems. As the special nature of the load capacitor, capacitor bank switching will inevitably arise over-voltage and at different phase angles under the closing surge. Over-voltage is a direct consequence arising from over-voltage caused by breakdown and re-ignite; while closing the maximum inrush current can reach steady state for more than 4 times, and the long duration of electrical equipment against very large. Permanent magnetic actuator vacuum circuit breaker closing bounce on the one hand because of the decrease, significantly reducing the closing impact force, which makes large-capacity capacitor switching probability when the renewed sharp decline, reducing the arc of contact of the burning, an effective solution to re-ignite the issue; the other hand, the controller can control the input capacitor voltage is zero, zero in the current cut capacitor, a fundamental solution to large-capacity capacitor switching operation is easy to produce too voltage and inrush current problems in order to improve the vacuum interrupter and the permanent magnetic actuator vacuum circuit breaker as a whole mechanical and electrical life.
Vacuum Circuit Breaker Closing resolved high-capacity load transformer inrush current generated when the switch on the issue. With the power of the transformer capacity increase, the original Closing obvious no-load transformer inrush current generated when the switch on the issue will become very prominent. Transformer in steady-state operation of the excitation current to only 2% of rated current to 10%, but in the power connected to the instant (closing time), excitation current will reach a large and very high frequency, thus forming a closing surge. In the medium and small-capacity transformers, because the total amount of this inrush current is not large, so the impact of the transformer is also small; but large-capacity transformers, If you are to catch up with the phase angle is 0 ° when the operation, resulting in The surge will be able to reach more than 10 times rated current, causing serious damage to the transformer. The use of the advantages of simultaneous switching can be controlled by closing point of 90 ° or 270 ° in the vicinity, thereby closing greatly reduce inrush current and ensure the safe operation of transformers and improve transformer life.
Vacuum Circuit Breaker Closing address generated by load-line over-voltage problem. At different voltage phase Guan timely, no-load generated by the operation of line over-voltage varies considerably. Among them, the phase angle of 90 ° when the peak, the resulting run-time over-voltage to achieve steady-state value of two times higher than that can cause a reduced ability to wiring insulation, leading to partial discharge increased, and even endanger the security of the entire transmission line. The use of the advantages of simultaneous switching can be controlled by closing point of 0 ° or 180 ° in the vicinity, so that customs co-operation over-voltage greatly reduced to improve circuit operation safety standards.
Combination of computer control technology to achieve zero-crossing point in the current or voltage to vote, cut circuit breaker. In this case, does not produce or slightly a little bit of arc. Hence, they do not consider how the interrupter. This brought the prominent benefits are: the impact of equipment and the power grid is small, is conducive to the safe operation of equipment and power grid; because it produces little or no arc, making a substantial increase in breaking performance, or capacity in the same conditions, so that significantly reduce the size of switching equipment to reduce material consumption, reducing costs while improving the environmental performance; can significantly reduce the material and interrupter interrupter structure, optimize the product design, improve equipment reliability.
Permanent magnet permanent magnet technology and institutional vacuum circuit breaker after the rapid development in recent years, there has been a substantial increase in its reliability, has reached the maintenance-free, intelligent requirements. The many advantages it has emerged, has decided that it is the alternative to traditional spring operating mechanism of vacuum circuit breaker, one of the best products. As a model of socialist new rural electrification demonstration project research and integrated high-performance needed for the building, one of the key technology and equipment, the product can completely meet the high power system reliability requirements. Permanent Magnet Permanent Magnet Technology and institutions in the high-voltage circuit breaker level, also will have broad prospects for development.
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