Detection of Electrical Corona on Low Frequency Radio Transmit Antenna Systems

摘要

Low frequency radio transmit antennas are used for a variety of applications inmarine navigation and submarine communications. These systems are typically high power (50-1000 kW) physically large but electrically small with very high voltages (100-500 kV) present on some antenna elements. In many applications the limiting output power of the antenna system is determined by the onset of electrical corona which occurs on antenna elements where electric fields are very high. When corona occurs it is extremely damaging to antenna components and drains power from the transmitted signal. There are currently no practical systems available for detection of corona occurrence in low frequency transmit antenna systems. This paper discusses electrical corona phenomena, research work done on measurement of signal characteristics of corona onset, and the potential of utilizing frequency domain analysis of antenna current signals for corona onset detection.... frequency spectrum of corona.