サージ保護デバイスの選択

サージ保護デバイスの選択

の選択 サージ保護装置 は次のように実行されます。

Step 1: Select Uc, UT, In, Imax of サージ保護装置. The maximum continuous operating voltage of the サージ保護装置 is much larger than that of the power system, and the transient overvoltage of the サージ保護装置 is much larger than that of the grid.

Step 2: Determine the protection distance, that is, determine the location of the サージ保護装置.

Step 3: Anticipate the life and failure modes of the サージ保護装置.

Step 4: Interrelationship between サージ保護装置 and other electrical appliances. Under normal circumstances, Ic will not cause any personal safety hazards and damage other equipment; when a fault occurs, サージ保護装置 will not affect other electrical appliances, such as RCD or circuit breaker. The surge coordination between the サージ保護装置 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: の選択 voltage protection level Uₚ 保護される機器のサージ耐性 Uw を考慮する必要があります。

Step 6: When two サージ保護装置s are used on the same conductor, the cooperation between the selected サージ保護装置 and other サージ保護装置s should be considered.

の用法 サージ保護装置 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 サージ保護装置 cooperates with the leakage protection device, in order to avoid the current when the サージ保護装置 operates may cause the leakage protection of the upper level at the same time The device malfunctions, so the サージ保護装置 needs to be installed with corresponding protection devices, such as circuit breakers or fuses, on its upper level during installation.