Three methods of grounding wire for photovoltaic equipment

At present, the most effective and widespread method among the existing measures is to connect the metal parts of electrical equipment to the earth. The four parts of grounding equipment, grounding body, lead-in wire and earth make up the grounding system. Good grounding is the most critical step in the success of lightning protection measures.

The most widely used grounding methods are as follows:

1. Common grounding

First, you need to dig a hole with a diameter of about 30cm in the ground, lay salt at the bottom of the hole, and then put the grounding body. After covering the grounding body with a PVC pipe, fill the gap around the grounding body with soil and compact it. , and finally put gravel on top and water to reinforce. Ground other grounding bodies in the same way, lay out an isosceles triangle, and connect them with 3.5cm copper wires to form a grounding body inside the photovoltaic field.

The advantages of this grounding method are:

① All metal parts of the photovoltaic power plant can be effectively grounded

② The grounding problem can be solved without burying many grounding bodies

③ Effectively control the resistance value within 4n

The metal equipment, lightning protection devices, inverters, etc. of all equipment in the photovoltaic power station can be directly connected to the same grounding body

In the event of lightning strike, it can be used as a grounding protection and neutral line, and in the event of a lightning strike, it can be used as a lightning protection grounding device.

2. Single grounding

Some areas are affected by geographical environment. The poles in the photovoltaic field are often struck by lightning and are relatively fixed. For these special poles, we need to install lightning protection devices separately. Burying the corresponding grounding body is an effective way to prevent lightning strikes. Usually the grounding body is a galvanized angle steel or flat steel with a length of about 2m.

3. Combined grounding

As the name implies, combined grounding is a lightning protection device composed of multiple grounding bodies. This kind of lightning protection combination is often arranged in the form of ring, square, radial and so on. In order to reduce the mutual shielding effect, when the grounding bodies are arranged in a ring shape, it is necessary to ensure that the ring wire cannot have openings, and the actual distance between two adjacent grounding bodies cannot be less than 3m. should be less than 1m.