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our transformer has these characteristics :220 to 220 volt and 5 amp we have a three phase system that we have provided our 220 volt output voltage from this system with a null wire. we want to install a immunology system.the factory which has made this system said to me that you should provide...

hi. who knows that how I can make zero voltage between null and earth? is using an isolation and earth system a good idea?and how? thanks a lot.

hi.I want to use an isolation transformer for a sensitive load. (laboratory)also now we have an earth system. can I use this isolation transformer and this earth system. because isolation transformer can isolate input voltage with output voltage will not any problem occur with our earth system...

hi.I need a ciruit for AVR(automatic voltage regulator).who can help me?maximum output power approximately 150KVA. thank you very much.