Lightning Protection, Grounding, and Overvoltage Protection Design

Due to the extensive area of the solar photovoltaic array and its installation in open outdoor environments, grid-connected photovoltaic power generation systems are susceptible to overvoltage caused by lightning. Therefore, appropriate lightning protection measures should be implemented based on the location and importance of the solar photovoltaic power generation system installation.

The lightning protection system in this setup consists of protection against direct lightning strikes and protection against induced lightning.

(1) Direct Lightning Strike Protection Design: In this solar photovoltaicpower generation system, the metal fasteners of the solar panels are reliably connected to the ground angle steel.

(2) Induced Lightning Protection Design: To prevent damage to system equipment from induced lightning, lightning protection devices are installed at the following locations in this design.

The inverter itself has lightning protection, meeting the national secondary lightning protection standard;

AC Distribution Cabinet: To protect the inverter from induced lightning introduced by the mains power, a surge protective device (SPD) is installed in the AC distribution cabinet. The AC SPD is connected in series with an AC circuit breaker and then to the AC output line, while the grounding terminal of the SPD is connected to the PE wire.

Grounding

(1) The grounding resistance of the solar grounding system is less than 4 ohms;

(2) In this design, all metal components, including supports and metal enclosures of electrical equipment, must be reliably grounded;

(3) The AC part of this design is equipped with a dedicated protective grounding wire (consistent with the building's grounding system).

Jiangsu Mangzhong Construction Co., Ltd. is a comprehensive energy service provider specializing in the photovoltaic field. It is a smart energy enterprise dedicated to photovoltaic power plant investment, development, design, construction, intelligent operation and maintenance, professional consulting services, and photovoltaic power plant equipment recycling.

Company Name: Jiangsu Mangzhong Construction Co., Ltd.

Business Scope: EPC for photovoltaic power plants and investment in photovoltaic solar power plants

Company Landline: 025-5888 3737   

Mobile Number: 159 5163 4545

Company Website: http://www.mangz.cn