an organic combined insulated dry electronic transformer for outputting an optical signal , in which an organic insulated capacitor voltage - divider insulator is used as the main insulator to bear all the whole high voltage . a coreless coil is wound around the outside of the tap of capacitance plate in the capacitor voltage - divider insulator to measure current ; or a low voltage signal is taken from the capacitance plate adjacent to the tap of capacitance plate in the capacitor voltage - divider insulator to measure voltage ; then the received current signal or the voltage signal is transformed into an optical signal by a converter that converts an electric signal into an optical signal and then outputted . the coreless coil as a current sensor has ground potential and the capacitor as a voltage sensor has low potential .