How To Install A Surge Protector
In lightning protection, surge protectors play an extremely important role. They discharge huge lightning currents and limit huge lightning overvoltages within a safe range. They can be called the protector of electrical equipment. So how can we correctly install surge protective device so that this protector can better play its role? Today, the editor will take you to learn about the installation method of surge protection device in detail.
Installation method of surge protectors. Before installing surge protectors, you need to understand its basic information, whether it is installed in a single-phase system or a three-phase system, and its basic interface position. Therefore, we need to identify some letters on the power supply lightning arrester. "L", "N", "PE" are the letters seen on this lightning arrester, which represent the live wire, the neutral wire, and the grounding wire respectively. Then, we need to find the air switch in the distribution box. Generally, the lightning arrester installed in the distribution box is installed behind the air switch. Finally, we need to connect the lightning arrester and the protected equipment in parallel in the system. The specific connection method is: connect the power cord to the "L" and "N" wiring holes of the lightning arrester respectively, and lead the grounding wire from the "PE" wiring hole to the lightning protection grounding busbar.
How to install a surge protector. When installing a surge protector, we need to pay attention to the following points.
1. Installation must be performed when power is off to ensure personal safety.
2. Before wiring, make sure that the cross-sectional area of the access wire meets the technical requirements. According to the national standard 50343, the cross-sectional area of the copper wire connected to the phase line of the first-level SPD shall not be less than 6mm², and the cross-sectional area of the ground wire shall not be less than 10mm². The cross-sectional area of the copper wire connected to the phase line of the second-level SPD shall not be less than 4mm², and the cross-sectional area of the ground wire shall not be less than 6mm². The wire connected to the surge protector should be short and straight, and the total length of the lead should not exceed 0.5m.
3. How to install a surge protector. When multiple surge protectors are to be installed on a line, the energy coordination between them should also be considered. Article 5.4.6 stipulates: When the line length between the voltage switch type surge protector and the voltage limiting type surge protector is less than 10m, and the line between the voltage limiting type surge protectors is less than 5m, a decoupling device should be installed between the two-stage surge protectors. Only when the surge protector has the function of automatic energy coordination, the line length between the surge protectors is not limited.
4. Installation method of surge protector, pay attention to check whether all screws are tightened to avoid heating of the wires due to poor contact and affecting electrical performance. The lightning arrester does not require special maintenance at ordinary times, just check regularly whether the wire connection is loose and whether the working status indication is normal. It should be noted that when the fault indicator is red, it means that there is an internal fault. At this time, the surge protector must be replaced as soon as possible to avoid loss of life and property.
