서지 보호 장치 선택

서지 보호 장치 선택

선택 서지 보호 장치 다음과 같이 수행됩니다.

Step 1: Select Uc, UT, In, Imax of 서지 보호 장치. The maximum continuous operating voltage of the 서지 보호 장치 is much larger than that of the power system, and the transient overvoltage of the 서지 보호 장치 is much larger than that of the grid.

Step 2: Determine the protection distance, that is, determine the location of the 서지 보호 장치.

Step 3: Anticipate the life and failure modes of the 서지 보호 장치.

Step 4: Interrelationship between 서지 보호 장치 and other electrical appliances. Under normal circumstances, Ic will not cause any personal safety hazards and damage other equipment; when a fault occurs, 서지 보호 장치 will not affect other electrical appliances, such as RCD or circuit breaker. The surge coordination between the 서지 보호 장치 and the overcurrent protector, when it is less than Imax, the overcurrent protector does not operate; when it is greater than or equal to Imax, the overcurrent protector is allowed to operate, but it cannot cause any damage.

Step 5: 선택 voltage protection level Uₚ 보호 장비의 서지 내력 Uw를 고려해야 합니다.

Step 6: When two 서지 보호 장치s are used on the same conductor, the cooperation between the selected 서지 보호 장치 and other 서지 보호 장치s should be considered.

사용 서지 보호 장치 is different in different grounding methods. On the one hand, because of the different characteristics of the protection under different grounding methods, the installation location is also different; on the other hand, the 서지 보호 장치 cooperates with the leakage protection device, in order to avoid the current when the 서지 보호 장치 operates may cause the leakage protection of the upper level at the same time The device malfunctions, so the 서지 보호 장치 needs to be installed with corresponding protection devices, such as circuit breakers or fuses, on its upper level during installation.