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A loss-adaptive self-oscillating buck converter is proposed for high-efficiency and low-cost LED driving. It consists of a self-oscillating unit composed of bipolar junction transistors (BJTs)-type self-oscillating unit, a loss-adaptive BJT driving unit, and a low-loss peak-current sensing unit. In this paper, its operation principle including a loss-adaptive BJT-driving scheme and a low-loss peak-current...
The detection and location of partial discharge (PD) in cast-resin dry-type transformers using the acoustic emission (AE) method is very difficult: the sound in filled epoxy is highly attenuated and is easily interfered with external sound sources. In addition, there is no operating procedure for the detection, identification and location of PD in cast-resin dry-type transformers up to present. In...
This paper aims to discuss the measurement and recognition of partial discharge (PD) signals in gas insulation load breaker switch (GILBS) by using high frequency current transformer (HFCT) and acoustic emission (AE) sensors. Three kinds of fault were made purposely within the GILBS that sealed up with SF 6 gas. Then we increase the voltage onto the GILBS until it produce PDs and measure the signals...
To detect partial discharge (PD) signal from internal defects or particles in gas insulation system (GIS), both couple capacitor (CC) and acoustic emission (AE) methods are applied in the examinations. According to the measured data, we need to distinguish whether it is PD or particle impact signal. From the CC measurement we can determine whether discharge occurs in one of the GIS chambers or not...
This study adopts the acoustic emission (AE) method to measure partial discharges (PD) in a cast-resin dry-type transformer and proposes a waveguide atop the high-voltage winding of the transformer to improve the propagation of the PD acoustic signals occurring in winding to acoustic emission sensors used. A waveguide is proposed to improve the signalspsila quick attenuation and it also is a safe...
A new, simple partial discharge (PD) detector for low-voltage rotating electrical machines using acoustical emission (AE) technique is developed in this study. Common electric components were used in the detector, which reduces the cost of inspection, comparing with the traditional PD detection methods that use expensive equipment costing from tens of thousands to several millions dollars. Experimental...
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