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Lightning Protection Grounding Design of Distributed Photovoltaic System

Time:2018/5/6Author:adminClick: 5241
The grounding body should adopt hot-dip galvanized steel. Its specifications are generally: 50mm diameter steel pipe, wall thickness not less than 3.5mm; 50mm*50mm*5mm angle steel, length not less than 2.5m; or 40mm*4mm flat steel, length is generally It is 2.5-4m.
The horizontal buried depth of the flat steel grounding body is not less than 0.5m, and the vertical depth of the angle steel is not less than 2.5m. It is necessary to re-do anti-corrosion and rust-proof treatment for the parts that have been welded.
The lead wire should adopt hot-dip galvanized round steel or flat steel, preferably round steel, diameter not less than 8mm; if flat steel, the thickness should not be less than 4mm.
The higher requirement is to use a double-insulated multi-strand copper wire with a cross-sectional area of 35 mm2. The equipotential bonding component aluminum frame and the galvanized bracket or the aluminum alloy bracket are plated. Only the crimping of the pressure block can not meet the grounding requirements. Only when the grounding hole of the component is connected to the bracket can the component be effectively grounded. Therefore, direct equipotential bonding between the external lightning protection system and the metal photovoltaic module must be established at these locations.
Surge protection is achieved by installing a surge protector on the live cable, reducing the surge and lightning overvoltage damage to the device, so the photovoltaic system needs to take the following protective measures: 1. The DC input and the AC output of the inverter Surge protection device is installed at the end.
2. Install surge protectors in grid-connected power distribution boxes (distribution cabinets) to protect the lightning waves invading along the connecting cables. To prevent a short circuit in the event of a surge protector failure, a circuit breaker or fuse must be connected in series to the front of the surge protector. The rated current of this circuit breaker (fuse) must not be greater than the overcurrent protection recommended by the SPD data sheet. The maximum rating of the device.
To sum up, in a large-scale ground power station, a very complete lightning protection system must be built, including lightning rods, lightning protection strips, grounding devices, ground wires, and lightning protection devices. Industrial and commercial projects can make use of the original lightning protection devices of the building to ensure lightning protection and grounding of the equipment. If the housing project is not high and there are high buildings nearby, the requirement for lightning protection is relatively low.
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