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Low-voltage circuit breakers are widely used in low-voltage power distribution systems. They are a kind of protective electrical components with functions of open circuit protection, overload protection, control and isolation. They are suitable for low-voltage power distribution systems for industrial and civil construction terminals. If the low-voltage circuit breaker is improperly designed in the power distribution system, it will affect the normal operation of the power supply circuit. Therefore, when designing a low-voltage power distribution system, attention should be paid to the details of the selectivity and cascade protection of the low-voltage circuit breaker.
Cascade protection of low voltage circuit breakers. In the design of low-voltage distribution systems, the selective coordination between the upper and lower stages of the low-voltage circuit breaker must be selective, rapid and sensitive. Among them, the selectivity is related to the cooperation between the upper and lower two-stage low-voltage circuit breakers, and the rapidity and sensitivity are respectively related to the characteristics of the protection electric appliance and the operation mode of the line. When the upper and lower two-stage circuit breakers are properly matched, the faulty circuit can be selectively cut off to ensure that other fault-free circuits of the power distribution system continue to work normally; otherwise, the reliability of the power distribution system is affected. Cascade protection is the specific application of the current limiting characteristic of the circuit breaker. The main principle is to use the current limiting function of the upper circuit breaker. When selecting the lower circuit breaker, the circuit breaker with lower breaking capacity can be selected to reduce the cost and save the cost. purpose.
The upper-level current-limiting circuit breaker can break the maximum expected short-circuit current at its installation, because the low-voltage circuit breakers of the upper and lower stages in the low-voltage power distribution system are installed in series. When a short circuit occurs at the exit of the lower-level low-voltage circuit breaker, the short-circuit current is due to the upper level. The current limiting value of the low-voltage circuit breaker makes its actual value much smaller than the expected short-circuit current at that place. That is to say, the breaking capacity of the lower-level low-voltage circuit breaker is greatly enhanced with the help of the upper-level low-voltage circuit breaker, exceeding its rated breaking capacity. Cascading data can only be determined experimentally, and the choice of the lower and lower voltage circuit breakers can only be determined by the manufacturer of the low voltage circuit breaker.
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