Elección del dispositivo de protección contra sobretensiones
La selección de Dispositivo de protección contra sobretensiones se lleva a cabo de la siguiente manera.
Step 1: Select Uc, UT, In, Imax of Dispositivo de protección contra sobretensiones. The maximum continuous operating voltage of the Dispositivo de protección contra sobretensiones is much larger than that of the power system, and the transient overvoltage of the Dispositivo de protección contra sobretensiones is much larger than that of the grid.
Step 2: Determine the protection distance, that is, determine the location of the Dispositivo de protección contra sobretensiones.
Step 3: Anticipate the life and failure modes of the Dispositivo de protección contra sobretensiones.
Step 4: Interrelationship between Dispositivo de protección contra sobretensiones 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 protección contra sobretensiones will not affect other electrical appliances, such as RCD or circuit breaker. The surge coordination between the Dispositivo de protección contra sobretensiones 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: La selección de voltage protection level Uₚ Se debe considerar la capacidad de resistencia a sobretensiones Uw del equipo protegido.
Step 6: When two Dispositivo de protección contra sobretensioness are used on the same conductor, the cooperation between the selected Dispositivo de protección contra sobretensiones and other Dispositivo de protección contra sobretensioness should be considered.
El uso de Dispositivo de protección contra sobretensiones 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 protección contra sobretensiones cooperates with the leakage protection device, in order to avoid the current when the Dispositivo de protección contra sobretensiones operates may cause the leakage protection of the upper level at the same time The device malfunctions, so the Dispositivo de protección contra sobretensiones needs to be installed with corresponding protection devices, such as circuit breakers or fuses, on its upper level during installation.
