Power lightning arresters are mainly used for lightning protection in low-voltage power supply and distribution systems. They are divided into AC lightning arresters and DC lightning arresters. Ac lightning arresters should be classified and protected according to the location of the distribution box. Dc systems are typically used in communication, photovoltaic and energy storage systems, with a maximum of 2000VDC. All lightning arresters are made of high-quality components and support remote signaling alarms, facilitating monitoring and operation and maintenance.
Use high-quality graphite, zinc oxide varistors, gas discharge tubes and other components to have strong surge absorption capabilities;
Through multi-level SPD energy coordination, the voltage protection level is low and the probability of damage to the equipment is minimized;
The applicable system voltage range is wide, and there are corresponding SPD products for both AC and DC.
When selecting a power lightning arrester, it is first necessary to confirm the system voltage and the lines to be protected, distinguish whether it is an AC or DC system, and then equip the corresponding lightning arrester according to the specific system. Under normal circumstances, for a single-phase system, two lines L and N need to be protected, while for a three-phase system, three phase lines L and N need to be protected. The selection of N should be based on the specific power supply system. Dc systems are generally divided into high-voltage and low-voltage types. Low-voltage systems mainly only have 12/24/48/220VDC and are usually protected by 2P lightning arresters. High-voltage systems are typically used in photovoltaic and energy storage systems, with a maximum of 150/2000VDC and are usually protected by 3P lightning arresters.
Power lightning arresters generally need to be classified for protection into four levels: level one, level two, level three and level four. It is not the case that the larger the Imax, the better. Instead, the corresponding lightning arrester should be selected based on the location. At the same time, economic factors should also be considered to choose the most suitable lightning arrester.
The most common way to determine the failure of a power lightning arrester is through the SPD module window and the remote signaling alarm terminal. A green SPD module window indicates normal and a red one indicates failure, which can be used as a local judgment sentence. The remote signaling alarm terminal is a switch signal, which can be connected to the platform through the SPD detector to achieve remote alarm.
The wiring of the power lightning Answer: arrester is quite simple, mainly in parallel. At the same time, a backup protector needs to be equipped. The current size of the backup protector, the diameter and length of the cable must all comply with the corresponding standards.
Since the failure mode of the power lightning arrester is short-circuit mode, once it fails, the tripping device inside the lightning arrester will cut off the lightning arrester from the main circuit. The backup protector is an emergency measure to prevent the tripping device inside the lightning arrester from failing to trip. Generally, depending on the different Imax values, the backup protector will be selected between 40 and 63A.
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