The requirements of lightning rods in high voltage substations, and the basis for the preparation of

According to the current GB50057-2010 "Code for Lightning Protection Design of Buildings", the lightning rod (now renamed as the lightning rod) has the following requirements (the lightning rod in the high-voltage substation shall be implemented according to the requirements of this specification):

The installation of lightning rods (independent lightning rods or overhead lightning wires or nets) should be made so that the protected building and.

Hoods, discharge pipes and other objects protruding from the roof are within the protection range of lightning rods (lightning receivers). The formula for calculating the distance between the pillar of the lightning rod (independent lightning rod) and its grounding device and the protected building and the pipes, cables and other metal objects associated with it shall not be less than 3 m.

1) Above-ground part: when h x 5r i, s a 1 0 4 (r i ＋ 0 . 1 h x )

When h x 5r i, s a 1 0 1 (r i ＋ h x )

2) Underground part: s e 1 0 4r i

where: s a 1 — separation distance in air (m).

s e 1 — separation distance (m) in the ground

r i — impact grounding resistance of the grounding device at the stand-alone lightning rod, overhead lightning wire or grid pillar ( In general, i.e. non-soil areas with high resistivity, RI 10;

h x — The height of the protected building or calculation point (m).

For more details, please refer to the original text of GB50057-2010 "Code for Lightning Protection Design of Buildings".

How does a lightning rod in a substation determine its protection range?

"Code for Construction and Acceptance of Grounding Devices for Electrical Installation Engineering", "Handover Test Standards for Electrical Equipment for Electrical Installation Engineering", "Regulations for Quality Inspection and Evaluation of Electrical Installation Engineering", etc.

After consulting the "Substation Lightning Protection and Grounding Construction Plan", it was learned that the preparation of the substation lightning rod safety car installation plan is based on the "Code for the Construction and Acceptance of Grounding Devices for Electrical Installation Orange Sail Engineering" GB50169-2006, "Electrical Equipment Handover Test Standard for Electrical Installation Engineering" GB50150-2006, "Quality Inspection and Evaluation Regulations for Electrical Installation Engineering" DL, etc.

Lightning rods are installed to prevent lightning from striking electrical equipment. Arresters are installed to prevent induced lightning overvoltages and lightning shocks that invade the substation along the transmission lines and internal overvoltages.

Keep at least 20 meters away from high-voltage lines and lightning rods. Lightning rods, also known as lightning rods and lightning rods, are devices used to protect buildings, tall trees, etc. from lightning strikes. A flash receiver is installed at the top of the protected object and connected to the underground drainage network with a wire that meets the specifications.

The specifications of lightning rods must meet national standards, and the height specifications of lightning rods that need to be worn in each lightning protection category are different.

Lightning rod: The modern lightning rod was invented by the American scientist Benjamin Franklin. Franklin believed that lightning was a phenomenon of electrical discharge.

To prove this, he risked being struck by lightning on a thunderstorm day in July 1752 by flying a kite with a long metal wire limb into a thunderstorm and attaching a string of silver keys to the ends of the wire. When the lightning strikes, Franklin's hand approaches the key, and a string of electric sparks erupt from the key. There is also numbness in the hands.

Fortunately, the lightning that came down this time was relatively weak, and Franklin was not injured.

(1) All protected equipment should be within the protection range of lightning rods to avoid lightning strikes.

2) When lightning strikes the lightning rod, the lightning current enters the ground through the lightning rod, so that the lightning protection target ground potential increases, and the lightning rod should be prevented from counterattacking to the protected equipment.