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

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