Flashover of polluted insulators in contaminated areas is one of the most important factors influencing the operation of transmission and distribution lines and finally line outages. Therefore, it is essential to prevent and detect flashover in the insulators. Hence, utilizing the insulator status monitoring systems and predicting their functions have absorbed a lot of attention over the recent...

High-speed, low voltage Silicon-Germanium (SiGe) heterojunction bipolar transistors (HBTs) have been designed, fabricated, electrically characterized and modeled. The SiGe HBTs are suitable for use in radio frequency (RF) integrated circuit (IC) applications and were fabricated using non-selective epitaxial growth. The design of the extrinsic base region has been investigated in detail. Transie...

Abstract: Time-domain testing of A/D converter in single tone mode amounts to the identification of fundamental and harmonic tones in noise. The variable projection method reduces this problem to frequency estimation by minimising a onedimensional function. In this paper it is shown that the bias due to ignoring the harmonic distortion effect is negligible, and this approximation leads to fast ...

As wind, solar and other clean and green energy sources gain popularity worldwide, engineers are seeking ways to make renewable energy systems more affordable and to integrate them with existing ac power grids. In the present paper an attempt has been made for integrating the PV arrays to the smart nano grid using an artificial intelligent (AI) based solar powered cascade multilevel inverter. T...

Multilevel inverters have several advantages over the conventional two level inverters due to their lower switching frequency, reduced switching stresses, low EMI and EMC issues, ability to achieve high voltage levels, low THD etc. Multilevel inverters can synthesize the desired voltage from several levels of DC voltages. This paper presents the comparison of three level Flying capacitor and Ca...

Multi-Level Inverter technology has in the area of high-power medium-voltage energy scheme, because of their advantages such as devices of lower rating can be used thereby enabling the schemes to be used for high voltage Reduced Total Harmonic Distortion (THD).Since the dv/dt is the Electromagnetic Interference from the scheme the switching losses Lower switching frequencies can be paper presen...

one of the important factors influencing outdoor insulators performance is pollution phenomenon. the pollution, especially during humidity condition, reduces superficial resistance of insulator and lead to a flow of leakage currents (lc) on the insulator surface, which may result in total flashover. the lc characteristics are affected by parameters such as nature and severity of pollution. loca...