1. The transformer casing should be reliably grounded. The neutral wire and neutral point grounding wire should be laid separately, and the neutral wire should not be buried underground.
2. The neutral point grounding circuit of the transformer should be made with detachable connecting bolts near the transformer.
3. The grounding of transformers equipped with valve-type surge arresters should meet the requirement of a three-in-one system; that is, the transformer neutral point, transformer casing, and surge arrester grounding should be connected to a common ground.
4. The grounding resistance should be ≤4 ohms.
