An acoustic emission method for on-line monitoring the contamination-causing flashover of insulator
This paper presents an acoustic emission (AE) monitoring method. When a partial discharge occurs, there is an instantaneous release of energy, some of which is emitted as acoustic energy. The pollution severities of insulators in-service can be monitored and accordingly threaten to the insulation of power grid is evaluated by detecting the sound signals. To prove this AE monitoring method, artificial contaminations experiments are carried out. The essential information about the relationship of AE signal and PD are obtained in different moments of the whole process of flashover. The studied method is a new way of AE technique in monitoring and characterizing defects of electrical power equipments in-service.
DETECTING THE INSULATOR STRING WITH FAULTY INSULATORS ON GROUND BASED ON CORONA DISCHARGE FINGER PRINTS
Based on the finger prints of insulator corona discharges, a new detecting method is introduced to inspect for the faulty porcelain insulator string on ground in this paper. In this method, the pattern recognition was applied to identify the corona finger prints corresponding to faulty insulator strings,improving greatly the reliability of fault diagnostics. In order to confirm this technology, we developed an intelligent prototype and operated it on some 110 kV transmission lines in China. Our preliminary results is positive, indicating that the faulty insulator strings on transmission lines can be identified by this technology easily.
A slowly rotating coil system for AC field measurements of Fermilab Booster correctors
A method for measurement of rapidly changing magnetic fields has been developed and applied to the testing of new room temperature corrector packages designed for the Fermilab Booster Synchrotron. The method is based on fast digitization of a slowly rotating tangential coil probe, with analysis combining the measured coil voltages across a set of successive magnet current cycles. This paper presents results on the field quality measured for the normal and skew dipole, quadrupole, and sextupole elements in several of these corrector packages.