The standard voltage transformer, as a standard instrument, is used to verify the errors of transformers with accuracy grades two or less levels lower than it.
Technical specifications: Rated capacity: 0.2VA, 0.07VA, COSφ=1;
Secondary voltage: 100V,100V/√3, 110V,110V/√3;
Primary voltage: 10KV, 35KV, 110KV, 220KV;
Accuracy class: 0.002–0.05