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 protection device so that this protector can better play his role? Today, the editor will take you to learn about the installation method of surge protective device in detail.
Installation method of surge protectors. Before installing surge protectors, we must first ensure that they must be installed under power-off conditions to ensure personal safety. When installing surge protectors, it is necessary to determine whether the surge protectors are installed in a single-phase system or a three-phase system, as well as the location of their interfaces. Therefore, we need to identify some letters on the power supply lightning protector: "L", "N", "PE". These letters are printed on the outer shell of the lightning protector and are easy to find. They represent: live wire, neutral wire, and grounding. Then, we need to find the air switch in the distribution box. Generally, the lightning protectors installed in the distribution box are 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 ground wire from the "PE" wiring hole to the lightning protection ground busbar.
2. Before wiring, make sure that the cross-sectional area of the connected wire meets the national standard requirements
Installation method of surge protector, the above is the national standard 51348 regulations. The cross-sectional area of the copper wire connected to the phase line of the first-level SPD is not less than 6m㎡, and the cross-sectional area of the ground wire is not less than 10m㎡. The cross-sectional area of the copper wire connected to the phase line of the second-level SPD is not less than 4m㎡, and the cross-sectional area of the ground wire is not less than 6m㎡. This is the minimum requirement of the national standard. In the actual installation process, the cross-sectional area of the wire must be greater than the cross-sectional area required by the national standard to ensure that the lightning protection is continuously effective.
3. According to the provisions of the national standard 50343, the wire connected to the surge protector should be short and straight, and the total length of the lead should not exceed 0. 5m.
4. Installation method of surge protector. According to the national standard 50343, 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 restricted.
5. 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. It only needs to be regularly checked whether the wire connection is loose and whether the working status indication is normal. It should be noted that when the fault indication 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.
