Full sets of accessories
With the development of power electronic technology, the performance of low-voltage circuit breaker miniature has been improved steadily, which has realized intelligence, modularization and miniaturization, and improved the reliability and safety of distribution system and electrical equipment operation.However, due to install and use the structure of the whole set of switch equipment of low voltage circuit breaker continuous improvement and innovation, the design, manufacture and use of personnel selection and easy to overlook some problems when using low voltage air circuit breaker, and these problems may cause circuit breaker installation is unreasonable or error, not only can't exert its powerful control, measurement and protection, but there are certainFull hidden danger, not only reduces the reliability of equipment operation, but also poses a threat to the personal safety of operating personnel and will cause a certain amount of economic losses.
Low-voltage Circuit Breaker Miniature are also called automatic air switches, which can be used to connect and break load circuits, and can also be used to control motors that start infrequently. Its function is equivalent to the sum of part or all of the functions of knife switches, overcurrent relays, voltage loss relays, thermal relays and leakage protectors. It is an important protective electrical appliance in low-voltage distribution networks.
Especially with the development and application of the digital process of power system control methods and the wide application of integrated automation of power systems, the requirements for system visualization, automation, networking, real-time, and precision are getting higher and higher, and correspondingly, the application area is wide, The low-voltage circuit breakers with complex network structure, frequent operation and high failure rate also put forward higher requirements. Traditional circuit breakers simply cannot meet the needs of integrated automation of modern power systems. The application of intelligent technology is an important development and application direction of low-voltage circuit breakers.
Reasons and measures for trip of low pressure molded case circuit breaker caused by high temperature.
Low molding shell Circuit Breaker Miniature if installed in outdoor power distribution box, no wind in summer when ambient temperature is higher, and load, the temperature rises, serious when the outdoor temperature in the oven to 70 c, and even more, is high, the commonly used low molding shell circuit breaker is suitable working environment - 5 ℃ to + 40 c, and 24-hour average no more than 35 c, the overload protection circuit breaker thermal double gold Belongs to the element is composed of two metal rolling pressure with different thermal expansion coefficient, and two different metals in active and passive layer, when double metal when I feel the heat generated by the overload current active to the passive layer bend, bimetallic element generated displacement and bimetallic element touching the hot rod of thrust and its value is proportional to the curvature and temperature changes, if the circuit breaker around If the ambient temperature exceeds the reference temperature and the current passing through the circuit breaker is no more than the current load but the normal rated current or less than the rated current, the circuit breaker should operate earlier and lose the overload protection function. Therefore, it is necessary to increase the rating of the circuit breaker, reduce the on-site operating current and conduct on-site heat dissipation.
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