How to install lightning protection, how to install rural lightning protection devices?

You are talking about lightning protection of the house

1. Lightning rods or lightning belts can be used to protect direct lightning strikes. Lightning rods can be installed directly on buildings. Down conductors can be routed along the roof and walls of buildings. The ground resistance of the grounding electrode is allowed to be 20 30 and the natural grounding body is used as much as possible.

2. The lightning rod (lightning receiver) does not have to use all metal conductors, but can use wooden rods, and lay wires 10cm higher than the wooden poles and with a cross-sectional area of 6 10cm2 along the rods. It is also possible to lay several wires in parallel, but their total cross-sectional area is not less than 50mm2

3. If there are chimneys, water towers, and big trees nearby, they can also be used as lightning rod supporters to save investment.

4. For houses with metal roofs, the roof can be grounded, that is, a down lead wire can be installed at a distance of not less than 15m along the perimeter of the roof, and then connected with the grounding electrode.

5. For houses with flammable materials as roofs, when installing lightning rods on the roof, the down conductors should avoid flammable materials to prevent sparks from catching fire when guiding lightning currents.

6. In order to prevent lightning from being introduced into the house through the low-voltage overhead line, the iron feet of the line insulator can be grounded (the introduction of the road and the iron feet of the porcelain bottle on the first electric pole to the house should be grounded.

If it is a house with a flammable material roof, and the insulated porcelain bottle at the entrance of the line is directly installed under the eaves and the lower edge of the roof is lowered, then do not connect the iron feet of the porcelain bottle at the introduction to the ground, but the iron feet of the porcelain bottle on the electric pole closest to the house can be grounded).

7. The material should be made of stainless steel pipe or galvanized steel pipe (minimum 32), or 50*50 galvanized angle iron can be buried more than 2 meters deep in the ground when digging the foundation, and the hard soil can be used with the help of the power of the excavator. There are 2 embedded groundings, generally at the 2 feet of the foundation, preferably diagonally.

If it is a rock formation, it should be at least one meter deep, but it should be hit 6 roots, every meter and into a rectangle, the periphery is covered with lime, the middle is covered with charcoal, and the top is welded and closed with 12 steel bars, and the solder joints should be firm. If the bottom layer is covered with steel mesh, the ground can be welded on the steel mesh, and the effect is better.

1. Install it close to the side of the distribution transformer.

1. The metal oxide arrester (MOA) is connected in parallel with the distribution transformer during normal operation, with the upper end connected to the line and the lower end grounded. When there is an overvoltage in the line, the distribution transformer at this time will bear the three-part voltage drop generated when the overvoltage passes through the arrester, lead wire and grounding device, which is called residual voltage. In these three parts of the overvoltage, the residual voltage on the arrester is related to its own performance, and its residual voltage value is certain.

2. The residual pressure on the grounding device can be eliminated by connecting the grounding down wire to the distribution transformer shell and then connecting it with the grounding device. How to reduce the residual pressure on the lead becomes the key to protecting the distribution transformer. The impedance of the lead is related to the frequency of the current passing through, the higher the frequency, the stronger the inductance of the wire and the greater the impedance.

3. From U=IR, it can be seen that in order to reduce the residual voltage on the lead, the lead impedance must be reduced, and the feasible way to reduce the lead impedance is to shorten the distance between the MOA and the distribution transformer to reduce the lead impedance and reduce the lead voltage drop, so the arrester should be installed near the distribution transformer.

2. Installed on the low-voltage side of the distribution transformer.

1. There is no MOA installed on the low-voltage side of the distribution transformer, and when the lightning arrester on the high-voltage side discharges the lightning current to the ground, a voltage drop will be generated on the grounding device, and the voltage drop will act on the neutral point of the low-voltage side winding through the distribution transformer shell at the same time.

2. MOA is installed on the low-voltage side, and when the MOA discharge on the high-voltage side raises the potential of the grounding device to a certain value, the MOA on the low-voltage side begins to discharge, so that the potential difference between the winding outlet end of the low-voltage side and its neutral point and the shell is reduced, so that the influence of the "inverse transformation" potential can be eliminated or reduced.

3. The MOA grounding wire should be connected to the distribution shell.

The ground wire of the MOA should be connected directly to the distribution transformer housing, which in turn should be connected to the earth. It is a mistake to connect the grounding wire of the arrester directly to the earth and then draw another grounding wire from the grounding post to the transformer housing. In addition, the grounding wire of the arrester should be shortened as much as possible to reduce the residual voltage.

Fourth, in strict accordance with the requirements of the regulations and regular maintenance tests.

Regularly measure the insulation resistance and leakage current of the MOA, and replace it immediately once it is found that the insulation resistance of the MOA is significantly reduced or broken down to ensure the safe and healthy operation of the distribution transformer.

1. First of all, check the roof to see if there is a lightning protection belt fixed by the steel bar extension roof wall. If so, equipotential the metal doors and windows of the attic or with 16 square millimeters of copper wire.

2. All metal parts of the lightning rod must be galvanized, and attention should be paid to protecting the galvanized layer during operation. The needle tip is made of galvanized steel pipe, the thickness of the pipe wall shall not be less than 3 mm, the length of the needle tip shall not be less than 70 mm, and the lightning rod shall be installed vertically.

3. Then the bracket is installed, and the elastic line is carried out according to the design requirements and the file is set to contain the rotten world. Use a hand hammer and chisel to remove the hole, and the size of the hole should be consistent inside and out. First, the two ends of the bracket on a straight line are buried, and then the other brackets are buried in a straight line with a lead wire.

The cave should be wet with water before buriing. If concrete bearings are used, the concrete bearings are placed in different bins. First, draw a straight line between the two ends of the support, and then level and straighten the other supports with mortar.

4. Fix the bearing steel plate on the embedded anchor bolt, weld a rib plate, talk about the limb and then stand up the lightning rod, straighten and align, carry out spot welding, and then correct it to weld the other three flanks. Finally, the down lead wire is welded to the bottom plate, and the anti-rust paint of the medicine leather brush is removed.

An independent grounding device should be set up for an independent lightning rod, and the distance between the ground and the grounding network should not be less than 3m.

There should be a distance of not less than 5m between the independent lightning rod and the protected object to avoid counterattack when lightning strikes the lightning rod. Independent lightning rods should be equipped with independent grounding devices, and the distance between them and the grounding network should not be less than or less than the high-voltage power distribution device structure and the roof should not be installed with lightning rods. The lightning rod installed on the frame should be connected to the grounding grid, and a centralized grounding device should be installed.

The lightning rod should not be installed on the gate frame of the transformer, and the distance between the lightning rod and the grounding device and the road and the exit should be greater than 3m, otherwise the gravel or asphalt surface should be paved with a thickness of 5-8cm to protect people from the danger of stepping voltage. It is strictly forbidden to install overhead lighting lines, lines, broadcast lines, antennas, etc. on lightning rods or frames.

Hello, lightning rod installation method 1 rod lightning rod manufacturing and installation The lightning rod is composed of four parts: a lightning receiver (that is, the tip of the lightning rod), a strut, a grounding lead and a grounding body. The tip of the needle is made of thicker copper wire and iron wire, and it is better to use a thick iron rod; The strut can be a wooden pole or a metal pole; The grounding lead can be a thicker iron wire or other ribbon metal strip, the upper end is connected with the tip of the needle, and the lower end is connected with the grounding body buried in the ground, and the connection must be welded. The grounding lead must be connected to the grounding body with the whole wire, and the most moment must be selected to be connected to the grounding body, and it should not be bent as much as possible.

The grounding body is a metal object buried in the ground, usually made of steel pipes, angle steel, steel needles, etc., and the length should be 1 2m. The burial depth is not less than 2m. The lightning rod grounding body cannot be mixed with other grounding bodies and must be grounded independently.

2 Manufacture and installation of metal rod lightning rod The lightning rod with a metal rod as a pole can use the metal rod itself to guide the lightning current without a separate grounding lead. The tip of the lightning rod is welded together with the metal rod. The grounding body buried in the ground can be made of steel pipes, angle steel, steel needles, etc.

The length should be taken 1 2m. Buried in a pit with a depth of not less than 2m, some salt can be sprinkled in the pit. When choosing the installation location of the lightning rod, you should try to leave the roads and entrances and exits where people pass, so as to prevent the stepping voltage generated near the lightning rod during lightning strikes from injuring the human body.

Hope it helps.

(1) The base of the arrester is fixed first, and then each unit (section) of the arrester is installed from bottom to top.

2) The arrester has been assembled and qualified before leaving the factory, and the on-site installation should be assembled in strict accordance with the manufacturer's number, and cannot be interchanged, so as not to change the characteristics.

3) The valve-type arrester with series and parallel electric cathode should be selected during installation, so that the nonlinear coefficients between the in-phase combined units are close to each other, and the difference should not be greater than.

4) The contact surface of the arrester should be wiped clean, the oxide film and paint should be removed, and a layer of power composite grease should be coated.

5) The arrester should be installed vertically, and the sag deviation should not be more than 2%, and the metal sheet between the flange faces can be corrected if necessary. The three-phase center should be in the same straight line, the nameplate should be located on the same side that is easy to observe, the equalizing ring should be installed horizontally, and finally the gap should be smoothed and painted with putty.

6) Tighten the insulator string to make it tight, and the tensile force of each string in the same phase should be balanced to avoid additional tensile force on the arrester.

7) The discharge counter should be well sealed, reliable in action, and consistent in three-phase installation position, which is easy to observe. The ground is reliable, and the counter indicates the recovery of the zero position.

8) The exhaust channel of the zinc oxide arrester should be unobstructed, and the installation should avoid its exhaust gas, causing interphase short circuit or flashover to the ground, and should not spray and other equipment.