transformer oil sampling in the factory for main tank and oltc of 115kv 22kv power transformer

-site 115kv 22kv activity analyze bottle bottles breakdown cable columns conduit connect construction crushed danger design dielectric dissolve electrical energy engineering environment equipment factory flexible gas grounding industrial installation insulation insulator investigation laboratory line liquid machine main material metal oil oltc onsite plant power purify rock safety sampling shaft spread stand substation switchyard system tank transformer tube voltage workers workplace