Photovoltaic system to choose lightning protection precautions

The lightning protection of the photovoltaic system should be used in different use ranges. Consider the local thunderstorm day, the local power generation system environment, whether there is history of lightning overvoltage damage, whether there is an external lightning protection system and the rated voltage of the equipment, the maximum operating voltage and other factors when selecting the power surge protector. .

In a power generation system with external lightning protection, SPDs at the junction of LPZ0 and LPZ1 must be products that have passed the 10/350us waveform impact test.

SPD protection must be multi-level. For example, for the lightning protection of the power supply of electronic equipment, at least a discharge-type SPD and a pressure-limiting SPD should be adopted or a large-pass flow high-voltage protection horizontal pressure-limiting SPD and a small-pass flow low-voltage protection horizontal pressure-limiting SPD. Level protection.

For an unattended solar power system, a power SPD with a remote contact should be selected; for an on-site power generation system, a power SPD with audible and visual alarms may be used. All selected power SPDs have aging or damage. Window display.

The power SPD must be connected in parallel on the power supply line, and the corresponding air switch must be installed in front of the SPD to ensure that no short-circuit condition occurs in the solar power supply line under any circumstances.

When selecting the SPD lightning arrester, the manufacturer shall be required to provide relevant SPD lightning arrester technical parameter data and installation guidance. The correct installation can achieve the desired effect. The installation of SPD SPDs should be strictly based on the installation requirements provided by the factory. At the same time, the manufacturer must provide instruments and equipment for detecting whether the SPD is damaged or deteriorated in order to remove the SPD that has been deteriorated or damaged from the equipment.

The SPD uses Kevin wiring as much as possible to eliminate the voltage drop on the wire. When the Kevin connection cannot be achieved, the lead-in and lead-out lines are routed separately and the shortest path is chosen to avoid too high a voltage drop on the wires from damaging the device.

The SPD lightning protector ground wire is laid separately from other lines. The intensity of the magnetic field generated when the ground wire sheds the lightning current is relatively large and is separated by more than 50 mm to avoid over-voltage induced by other lines.

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