Electrical transformers: oil immersed (10kv, 35kv, 110kv s13, s18, s20, s22 series), epoxy cast dry type (10kv, 35kv sc(b)12, sc(b)13, sc(b)14, sc(b)18 series), amorphous alloy distribution, prefabricated substations (yb), combined transformers (zgs), photovoltaic power generation step up, and on load voltage regulating transformers (scz13, sz20, sz22). .