Underground substation, compact structure, small footprint, most of the substation and control equipment is located in the building, GIS type substation is often laid double or even three grounding grid.
In order to save land resources, urban substations such as 35kVspan>, 110kV, 220kV-class AC substations and 66kV DC substations are mostly GIS-type substations.
The following is a brief overview of the application of the Phillips Electric series grounding materials and other new grounding materials in the GIS type substation grounding field.
Unlike traditional open-type substations, most of the substation equipment is concentrated in 3 to 4 floors due to the large number of GIS equipment. The floor space is small, the number of equipment grounding lines is greatly reduced, and the primary grounding grid is buried and the lowest floor. In the cushion, waterproof layer and backfilled plain soil, most of the grounding lead wires are led out around the main grounding grid, crossing each floor, and finally connected with the lightning protection belt of the building/roof, and also serve as the down conductor for direct lightning protection.
The secondary grounding in the room is mostly laid by pure copper row and directly connected to the equipment through BVR copper cable. Another common design is to directly solder the copper wire or copper wire to the steel plate of the equipment foundation.
1. Lightning Protection Belt:
Serial number | product name | 35KV exchange station | 66KV DC station | 110KV exchange station | 220KV exchange station | skills requirement |
1 | Copper coated steel round wire | CCSEPΦ10 | CCSEPΦ12 | CCSEPΦ12 | plating | |
2 | Pure copper round wire | D 8 | F 10 | F 10 | ||
3 | Zinc coated steel round wire | ZCSCCΦ10 | ZCSCCΦ12 | ZCSCCΦ12 |
2. Horizontal Grounding Pole:
Serial number | product name | 35KV exchange station | 66KV DC station | 110KV exchange station | 220KV exchange station | skills requirement |
1 | Pure copper row | TMY40 * 4 | / | TMY-40 * 5 | TMY-40 * 5 | T2 99.9 % |
2 | Pure copper strand | TJ150mm² | / | TJ185mm² | TJ185mm² | T2 99.9 % |
3 | Copper coated steel strand | CCSCC185mm² | / | CCSCC240mm² | CCSCC240mm² | 30% conductivity 0.254mm copper layer thickness |
4 | Zinc coated steel | ZCSCCΦ16mm | / | ZCSCCΦ18mm | ZCSCCΦ20mm | Zinc layer thickness 3mm |
5 | Hot-dip galvanized flat steel | HDGS50 *5 mm | / | HDGS60 * 6mm | HDGS60 *8 mm | Zinc layer thickness is greater than 75um |
3. Vertical Grounding Pole:
Serial number | Material name | 35KV exchange station | 66KV DC station | 110KV DC station | 220KV DC station | skills requirement |
1 | Copper-clad steel grounding pole | CCSEPΦ3/ 4" ×8' | / | CCSEPΦ1" * 8' | CCSEPΦ1"*8' | Copper layer thickness is greater than 0.254mm |
2 | Pure copper grounding pole | TYΦ5/ 8" ×8' | / | TYΦ3/ 4" ×8' | TYΦ3/4" ×8' | |
3 | Zinc-coated steel grounding pole | ZCSCCΦ3/ 4" ×8' | / | ZCSCCΦ1" * 8' | ZCSCCΦ1"*8' | Zinc layer thickness is greater than 3mm |
4 | Stainless steel grounding pole | S304Φ3/ 4" ×8' | / | S304Φ1" * 8' | S304Φ1"*8' | SS304 material |
5 | Galvanized steel grounding pole | HDGSΦ3/ 4" ×8' | / | HDGSΦ1" * 8' | HDGSΦ1"*8' | Zinc layer thickness is greater than 75um |
6 | Ion grounding pole | SIGΦ2" * 8' | / | SIGΦ2"*8' | SIGΦ2 “ * 8” | Pure copper tube wall thickness is greater than 2mm |