Escolha do dispositivo de proteção contra surtos
A seleção de Dispositivo de proteção contra surtos é realizado da seguinte forma.
Step 1: Select Uc, UT, In, Imax of Dispositivo de proteção contra surtos. The maximum continuous operating voltage of the Dispositivo de proteção contra surtos is much larger than that of the power system, and the transient overvoltage of the Dispositivo de proteção contra surtos is much larger than that of the grid.
Step 2: Determine the protection distance, that is, determine the location of the Dispositivo de proteção contra surtos.
Step 3: Anticipate the life and failure modes of the Dispositivo de proteção contra surtos.
Step 4: Interrelationship between Dispositivo de proteção contra surtos and other electrical appliances. Under normal circumstances, Ic will not cause any personal safety hazards and damage other equipment; when a fault occurs, Dispositivo de proteção contra surtos will not affect other electrical appliances, such as RCD or circuit breaker. The surge coordination between the Dispositivo de proteção contra surtos 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: A seleção de voltage protection level Uₚ deve considerar a capacidade de resistência a surtos Uw do equipamento protegido.
Step 6: When two Dispositivo de proteção contra surtoss are used on the same conductor, the cooperation between the selected Dispositivo de proteção contra surtos and other Dispositivo de proteção contra surtoss should be considered.
O uso de Dispositivo de proteção contra surtos 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 Dispositivo de proteção contra surtos cooperates with the leakage protection device, in order to avoid the current when the Dispositivo de proteção contra surtos operates may cause the leakage protection of the upper level at the same time The device malfunctions, so the Dispositivo de proteção contra surtos needs to be installed with corresponding protection devices, such as circuit breakers or fuses, on its upper level during installation.
