... advanced technology specializing in the production 160VA to 600KVA between, SG series three-coherent-type transformer is our company Siemens similar ... VDE0550, IEC439, JB5555, GB226 and other international and national standards.SG series three-coherent-type transformers are widely used in AC ... , made after charging rectifier, voltage regulator and DC voltage only SG series three Coherent Transformer