Abstract
Silent discharge is widely used for an industrial ozonizer and toxic gas treatments, hence they will become an electromagnetic noise source. In this paper, an experimental investigation from the point of view of electromagnetic compatibility (EMC) has been conducted to grasp noise characteristics of silent discharge type combustion flue gas cleaning systems. The silent discharge plasma reactor presently used is consists of ceramic made double coaxial cylinders. Discharge current and induced current waveforms are measured. The discharge current has multiple pulses with duration on the order of hundred microseconds at a specific phase of applied voltage, and the polarity effect in silent discharge that has already been reported by other investigators is observed. The peak value of discharge current increases suddenly with applied voltage at over 22kVpp and its order is 10A. Frequency components of discharge current at 40MHz is largest in frequency range of 1MHz to 100MHz. The maximum value of the discharge current time rise increases suddenly at 22kVpp. It is on the order of 1010 A/s. The induced current at the simulated DC control line 1.4m away from the reactor also increases suddenly at 22 kVpp. Both the discharge current and the induce current have large current component in common frequency. From the point of view of EMC, this type reactor should be operated below 22kVpp.
