اختيار جهاز الحماية من زيادة التيار
اختيار جهاز حماية الطفرة يتم تنفيذها على النحو التالي.
Step 1: Select Uc, UT, In, Imax of جهاز حماية الطفرة. The maximum continuous operating voltage of the جهاز حماية الطفرة is much larger than that of the power system, and the transient overvoltage of the جهاز حماية الطفرة is much larger than that of the grid.
Step 2: Determine the protection distance, that is, determine the location of the جهاز حماية الطفرة.
Step 3: Anticipate the life and failure modes of the جهاز حماية الطفرة.
Step 4: Interrelationship between جهاز حماية الطفرة and other electrical appliances. Under normal circumstances, Ic will not cause any personal safety hazards and damage other equipment; when a fault occurs, جهاز حماية الطفرة will not affect other electrical appliances, such as RCD or circuit breaker. The surge coordination between the جهاز حماية الطفرة 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: اختيار voltage protection level Uₚ ينبغي أن تأخذ في الاعتبار قدرة تحمل الطفرة Uw للمعدات المحمية.
Step 6: When two جهاز حماية الطفرةs are used on the same conductor, the cooperation between the selected جهاز حماية الطفرة and other جهاز حماية الطفرةs should be considered.
استخدام جهاز حماية الطفرة 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 جهاز حماية الطفرة cooperates with the leakage protection device, in order to avoid the current when the جهاز حماية الطفرة operates may cause the leakage protection of the upper level at the same time The device malfunctions, so the جهاز حماية الطفرة needs to be installed with corresponding protection devices, such as circuit breakers or fuses, on its upper level during installation.
