Lightning protection grounding manufacturer
A: Beijing Yitonghui Lightning Protection Technology Company
Address: No.2 Guangjin South Street, Liangxiang Industrial Park, Fangshan District, Beijing
B: Beijing Xingtiantong Lightning Protection Technology Co., Ltd.
Address: Room 2007, Building 5, No.7 Lianbao Road, Haidian District, Beijing
C: Beijing Hua Teng Da Lightning Protection Technology Co., Ltd.
Address: Block A, No.43 Guofang Road, Xiji Town, Tongzhou District, Beijing 103
Lightning protection grounding device
1) lightning receiving device: a metal rod (lightning receptor) that directly or indirectly receives lightning, such as lightning rod, lightning belt (net), overhead ground wire, lightning arrester, etc.
2) Down lead: conductor used to conduct lightning current from lightning receptor to grounding device.
3) Grounding wire: a metal conductor that does not carry current under normal circumstances, and is used to connect the grounding terminal of electrical equipment and towers with the grounding body or zero line.
4) Grounding body (pole): The metal conductor buried in the soil and in direct contact with the earth is called grounding body. Divided into vertical grounding body and horizontal grounding body.
Lightning protection and grounding installation scheme
Lightning protection and grounding, first of all, to detect the surrounding terrain, understand the general situation of the project, and then prepare materials, appliances and personnel. If used indoors, it is mainly used to connect electricity to power equipment. The terminal clamp adopts flat spiral type, and the grounding method adopts grounding clamp (bus copper bar type). Low voltage grounding wire is divided into indoor equipment grounding wire and outdoor line grounding wire. Low voltage lines generally adopt three-phase four-wire system. If it is used outdoors, outdoor lines are mostly double springs, and the grounding mode is underground. Installed in the highest place of the house, the downlead is buried. The down lead must be firmly connected, the grounding wire should be vertical as far as possible, buried two meters deep, and the soil should be backfilled with loose salt.
Precautions for lightning protection and grounding
According to the area and height of the protected building, the correction coefficient of thunderstorm day and buried environment, and the use nature of the building. , choose lightning arrester and determine the height of lightning arrester pole. During installation, all components should be connected reliably. After installation, all joints or damaged parts of metal surface coating shall be rusted. Lightning protection equipment shall be connected to the lightning protection belt or grounding grid on the daughter's wall through down lead, and the grounding resistance value shall not exceed 10 ohm. In areas with high soil resistivity, the requirements for grounding resistance can be relaxed appropriately. After the lightning arrester is put into use, it is necessary to regularly check whether the components are firmly connected and whether the down lead is reliably connected to the grounding system.
Code for acceptance of lightning protection and grounding
According to Chapter III of Code for Lightning Protection Design of Buildings (GB50057-94(2000 edition), lightning protection measures for buildings; Section 2. Requirements of lightning protection measures for Class I lightning protection buildings ..
Article 3.2. 1: The lightning protection grounding device shall be used together with the grounding device of electrical equipment, and its power frequency grounding resistance shall not be greater than10Ω. Section 3. Requirements of lightning protection measures for lightning protection buildings of category II,
Article 3.3.4: The grounding resistance of each down conductor shall not be less than10Ω, and grounding devices such as lightning protection, lightning induction, electrical equipment and information system shall be adopted.
Calculation of Lightning Protection and Grounding Engineering Quantity
1, the lightning rod is calculated as "root" when it is manufactured and installed, but it is calculated as "base" when it is installed independently, and it should be renamed as several base lightning rods when it meets lightning rods next time.
2. The manufacturing unit of grounding electrode is the same as the installation and lightning rod manufacturing unit, with "root" as the unit, and the length is 2.5m when the manufacturer has no special specifications.
3. The laying of grounding bus and grounding wire shall be calculated according to the unit length of 10m. Due to other special reasons, its length will be 3.9% longer than the required length. Such as turning around and avoiding obstacles.
4. For example, the grounding jumper here is in the unit of "place", and each jumper needs to be counted as "one place". The frame of outdoor power distribution equipment needs to be grounded, and it is also counted as "one place" here.
5. When installing semiconductor lightning arresters with fewer pins and longer pins, the unit is "fixed", and it will carry out related projects according to the required installation height.
6. The installation of the main reinforcement grounding down lead of the building is based on 10m, and its integer is required. There are two main columns in each column. If you need more than two, you need to readjust.
7. The production and installation of the disconnection clip are all based on the "set".
8. The laying of equalizing ring shall be considered in the form of using the main reinforcement in the ring beam as the grounding connection of equalizing ring, and shall be calculated as 10m.
9. Grounding of steel window and aluminum window shall be calculated in one place and two places.
10, and the drag reducer is buried in kg.