High voltage lightning arrester is one of the most important devices to protect electrical equipment from lightning strikes. When selecting and installing high-voltage arresters, you need to pay attention to some principles and steps. This article will explain in detail the selection and installation precautions for high-voltage arresters.
Selection principles for high-voltage arresters
1. Protection level
When selecting a high-voltage arrester, you need to consider the lightning level of the environment where the equipment is located. According to different lightning levels, different levels of high-voltage arresters can be selected. Generally speaking, the protection level of a high-voltage arrester should be greater than the lightning level of the environment where the equipment is located.
2. Rated voltage
The rated voltage of the high voltage surge arrester should match the rated voltage of the equipment. If the rated voltage of the high-voltage arrester is too low, it may not be able to effectively protect the equipment from the risk of lightning strikes; if the rated voltage of the high-voltage arrester is too high, it may cause the high-voltage arrester to be broken down and unable to work properly.
3. Rated discharge current
The rated discharge current of a high-voltage arrester refers to the maximum current that the high-voltage arrester can withstand when struck by lightning. When selecting a high-voltage arrester, the appropriate rated discharge current needs to be determined based on the load current and lightning level of the equipment.
4. Response time
The response time is the time from when the high-voltage arrester is struck by lightning to when it starts working. The shorter the response time, the stronger the protection capability of the high-voltage arrester. When selecting a high-voltage arrester, it is necessary to select a high-voltage arrester with the shortest possible response time.
5. Installation method
There are many ways to install high-voltage arresters, such as plug-in type, fixed type, box type, etc. When selecting a high-voltage arrester, it is necessary to select the appropriate installation method based on the actual conditions of the equipment.
Selection steps for high-voltage arresters
1. Determine the rated voltage and load current of the equipment
Before selecting a high-voltage arrester, you need to determine the rated voltage and load current of the equipment. These parameters will affect the selection of high-voltage arresters.
2. Determine the lightning level of the environment where the equipment is located
The lightning level of the environment where the equipment is located will directly affect the selection of high-voltage arresters. Therefore, it is necessary to evaluate the environment in which the equipment is located to determine the lightning level.
3. Determine the protection level of the high-voltage arrester
According to the lightning level of the environment where the equipment is located, the appropriate high-voltage arrester protection level can be selected.
4. Determine the rated discharge current and response time of the high-voltage arrester
Based on the load current and lightning level of the equipment, the appropriate rated discharge current and response time of the high-voltage arrester can be determined.
5. Select the appropriate high voltage surge arrester
An appropriate high-voltage arrester can be selected by evaluating the equipment's rated voltage, load current, lightning level, protection level of the high-voltage arrester, rated discharge current and response time.
Precautions for installing high-voltage arresters
1. Installation location
The high-voltage surge arrester should be installed as close as possible to the equipment to shorten the guidance path and reduce the voltage gradient. At the same time, the installation location of high-voltage arresters should be avoided in places prone to lightning strikes, such as the tops of buildings and high places on elevated lines.
2. Grounding
The grounding of high voltage surge arresters is very important. The grounding resistance should be as small as possible to improve the grounding effect. At the same time, the ground resistance should also be tested to ensure that it meets relevant standards.
3. Connect the lines
The connecting lines of high-voltage arresters should be as short as possible to reduce voltage gradients. At the same time, the connecting lines should be made of suitable materials, such as copper wire or aluminum wire.
4. Installation method
The installation method of high-voltage arresters should comply with relevant standards. For example, the plug-in high-voltage arrester should be inserted into a suitable socket, and the fixed high-voltage arrester should be fixed on a suitable bracket.
5. Installation check
After installing the high-voltage arrester, the installation inspection should be carried out. The inspection content includes the grounding of the high-voltage arrester, the contact of the connecting line, and the installation position of the high-voltage arrester.
In short, when selecting and installing high-voltage arresters, you need to pay attention to some principles and steps. When selecting a high-voltage arrester, it is necessary to evaluate and select an appropriate high-voltage arrester based on parameters such as the equipment's rated voltage, load current, lightning level, protection level of the high-voltage arrester, rated discharge current and response time. When installing a high-voltage arrester, you need to pay attention to the installation location, grounding, connecting lines, installation methods, etc., and perform installation inspections to ensure the normal operation of the high-voltage arrester.
