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Recently, Xiao Lei received many inquiries from small partners. The main content was to ask why fuses should be installed on the front end of the power surge protector. Friends, your mood, Xiao Lei knows. Therefore, Xiao Lei specifically arranged a series of questions on why the front end of the power lightning protector needs to be installed with fuses. I hope to help the pro! What are you waiting for?
The power surge protector is equivalent to a branch circuit connected in parallel on the line. The circuit is set to protect the electrical equipment (circuit breakers or fuses) to avoid short circuit breakdown of the power protector itself (voltage limiting type power supply surge protector) or power frequency continuation. When the flow (switching power supply lightning protection device), the main power supply line switch trips, resulting in the expansion of the power cut range.
The front end of the power lightning protector is equipped with fuses and short-circuiters to protect the power supply lightning protector, but Xiao Lei still recommends that you use the circuit breaker. Because the fuse of the fuse is blown, it is not easy to find it (otherwise, everyone thought that the power supply bureau's uncle did not supply power to your home).
If there are still parents who don't understand, then Xiaolei sums it up again. The installation of fuses basically has four major functions:
(1) Indirect contact protection when the power surge arrester body is damaged or short-circuited and the internal fuse or disconnector fails;
(2) Avoid the failure of the power supply lightning protector so that the main circuit interrupts the power supply;
(3) Degraded short-circuit protection for surge protectors with voltage limiting type;
(4) Turn off the power frequency freewheeling of the lightning protection switch type power supply.
Since the power surge protector is actually a varistor, it has a high-pass low-resistance characteristic. When the grid operates without exceeding the continuous operating voltage, a high-impedance state occurs between the two electrodes. If the voltage between two electrodes exceeds the ignition voltage due to a lightning strike or overvoltage operation, the gap is broken and the overvoltage energy is released by the arc discharge. After the shock wave passes, the arc will be extinguished by the arc extinguishing system consisting of the arc segment and the arc extinguishing chamber, and the high impedance state will be restored to protect the system.
If there is a fault in the power lightning protection device itself, it will be turned on for a long time, resulting in a short circuit of the power supply or power distribution system. At this time, the front-end circuit breaker or fuse needs to be cut off in time to ensure the normal operation of the loop. (This is the function of the front breaker or fuse of the power surge protector)
Below, Xiao Lei will enlarge the strokes, and send everyone a lightning protection device matched with Lei Zhenzi's circuit breaker's selection parameter comparison table. Everyone must remember the collection.
Well, I hope Xiaolei's big move will be enjoyed by everyone. Xiao Lei really hopes that everyone will come here to purchase mine power protection devices.