For 10kV-6kV transformers, what is the safe distance from the fence?

For the minimum value, I remember that the safety distance seems to be 1. 0 meters.

For transformers with a capacity of >=1250 KVA, the minimum clear distance from their exterior to the door is 1 meter, while the minimum clear distance to the back wall and side walls is 0.8 meters

According to the Electrical Design Manual for Power Engineering, electrical equipment rated at 10 KV must be at a minimum distance of 2.9 meters from buildings.

I think I’ve read somewhere that it’s around three meters

The forum provides a download link for the GB 50060-1992 Code for Design of 3–110 kV High-Voltage Switchgear: http://bbs.hcbbs.com/viewthread.php?tid=222496. Table 5.3.2 specifies the minimum widths for various types of passages within switchgear rooms. Passage Type, Layout Pattern, Operation Passage, Maintenance Passage: Fixed-type, Trolley-type. When equipment is arranged in a single row, the width is 800 mm and the height is 1500 mm; when two rows of equipment are used, the width is 1000 mm and the height is 2000 mm. For two trolleys, the width is 900 mm. Note that the width of the passages can be reduced by 200 mm where there are protrusions in the building’s walls or columns. When trolley-type switchgear does not require on-site maintenance, the width of its passages can be reduced accordingly. When fixed-type switchgear is installed against a wall, the distance between the switchgear and the wall should be around 50 mm. When using 35 kV trolley-type switchgear, the width of the passage behind the switchgear should be no less than 1.0 meter. According to clause 5.3.3, GIS units installed indoors should have passages whose width meets the requirements for transporting components, but it should not be less than 1.5 meters. For GIS units installed outdoors, the width of the passages should be determined based on the requirements of on-site operations. Clause 5.3.4 states that for oil-immersed transformers installed indoors, the minimum clear distance between the transformer’s exterior and the four walls of the transformer room should comply with the specifications in Table 5.3.4. Table 5.3.4 shows the minimum clear distances between the exterior of oil-immersed transformers and the walls of the transformer room. Transformer Capacity (kVA): 1000 and below, 1250 and above. Distance between the transformer and the back wall/side walls: 600 mm, 800 mm respectively. Distance between the transformer and the door: 800 mm, 1000 mm respectively. For oil-immersed transformers that require on-site maintenance, the interior height of the transformer room can be determined as the minimum height required for lifting the transformer core plus 700 mm, while the width can be determined by adding 800 mm to each side of the transformer. Clause 5.3.5 specifies that for dry-type transformers installed indoors, the minimum clear distance between their exterior and the surrounding walls should be 0.6 meters. The distance between dry-type transformers should be at least 1 meter, and these distances should also meet the requirements for inspection and maintenance. Fully enclosed dry-type transformers are not subject to these distance restrictions. Clause 5.3.6 states that outdoor switchgear units in industrial areas should be surrounded by fences with a height of at least 1.5 meters. Clause 5.3.7 specifies that the height of the protective grids surrounding electrical equipment in switchgear units should be at least 1.2 meters. The distance from the lowest bar of the grid to the ground should not exceed 200 mm. The height of the protective nets surrounding electrical equipment in switchgear units should be at least 1.7 meters, and the mesh size of the nets should not be larger than 40 mm. Fences should be locked. Clause 5.3.8 states that in indoor compartments equipped with oil circuit breakers, in addition to installing protective grids, protective barriers should also be placed at the operating mechanisms of those circuit breakers and isolators that are operated on-site. The width of these barriers should be sufficient for personnel to operate them, and their height should be at least 1.9 meters. Clause 5.3.9 specifies that for outdoor busbars, protective measures should be taken depending on the specific circumstances, especially when there is a risk of foreign objects falling onto the busbars

Code for Design of High-Voltage Switchgear Equipment for 3–110 KV Systems, GB 50060-92, Article 5.3.4: For oil-immersed transformers installed indoors, the minimum clear distance between their outer dimensions and the four walls of the transformer room shall comply with the requirements specified in Table 5.3.4. Minimum clear distance (mm) between the outer dimensions of the oil-immersed transformer and the four walls of the transformer room　　　　　　　Table 5.3.4: Transformer capacity – 1000 KVA and below, 1250 KVA and above. Distance between the transformer and the back wall/side walls: 600 mm, 800 mm respectively; distance between the transformer and the door: 800 mm, 1000 mm respectively. For indoor oil-immersed transformers that are to be maintained on-site, the interior height of the transformer room can be determined as the minimum height required for core lifting plus 700 mm, while the width can be determined by adding 800 mm to each side of the transformer. Article 5.3.5 For dry-type transformers installed indoors, the clear distance between their outer surfaces and the surrounding walls shall be no less than 0.6 m; the distance between dry-type transformers shall be no less than 1 m, and these conditions shall meet the requirements for inspection and maintenance. Fully enclosed dry-type transformers are not subject to the aforementioned distance limitations.

Today, there is a project that requires addressing the distance between outdoor transformers and buildings; I checked it just in case. Now I understand that the distance between 6–10 kV lines and buildings or structures is usually 3 meters. (There should be no doors, windows, ventilation openings, etc., on or within 3 meters around the transformer!) ~! ;P If the oil level is below 1000 kg, it can be reduced to 1.5 meters.

In 04D201-3, I see that the distance from the center of the transformer to the wall is 1750 mm; (however, the voltage on the low-voltage side is 0.4 kV.)

Outdoor floor-mounted transformer stations are suitable for installing transformers with a capacity of 200 KVA or more. The general requirements are as follows: a fixed mesh fence should be installed around the transformer station, with a height of no less than 1.7 meters. The distance between the outer edge of the transformer and the mesh fence as well as the exterior wall of buildings should be at least 0.8 meters; the distance from it to the outer edge of adjacent transformers should be at least 1.5 meters. The height of the transformer’s base above the ground should be no less than 0.3 meters. When the outer perimeter of the transformer is within 5 m of the exterior wall of a building, the fire protection requirements of the building must be taken into account; moreover, rainwater from the building’s eaves must not fall on the transformer.