Accurate faulty phase detection under single-line-to-ground (SLG) fault is the basis of emerging voltage-based arc suppression technology. Most conventional recognition criteria assume distributed line-to-ground parameters are symmetrical, therefore suffering invalidity in actual distribution networks especially high-resistance ground-fault conditions. This paper firstly analyzes magnitude and ...

This paper presents the comparative study of three phase twenty five level diode clamped and cascaded H-bridge multilevel inverters. The comparison is made in respect of requirement of devices, quality of output voltage and reduction of total harmonic distortion at the multilevel inverter terminals. In this work multicarrier sinusoidal pulse modulation control methods of Phase disposition (PD-P...

An accelerating voltage of 100-300kV remains a good choice for the majority of TEM or STEM specimens, avoiding the expense of high-voltage microscopy but providing the possibility of atomic resolution even in the absence of lens-aberration correction. For specimens thicker than a few tens of nm, the image intensity and scattering contrast are likely to be higher than at lower voltage, as is the...

A phase locked loop [4] is a control system that generates an output signal whose phase is related to the phase of an input signal. PLL is a feedback system that combines a voltage controlled oscillator (VCO) [4] and a phase comparator so connected that the oscillator maintains a constant phase angle relative to a reference signal. PLLs are used to generate a stable output high frequency signal...

Electric variable speed drives (VSD) have been replacing mechanic and hydraulic systems in many sectors of industry transportation because their better performance reduced cost. However, the electric still face issue being considered less reliable than mechanical ones. For this reason, researchers actively investigating effective ways to increase reliability such systems. This paper is focused ...

The paper proposes an algorithm to calculate the switching angles using harmonic elimination PWM (HEPWM) scheme for voltage source inverter. The algorithm is based on curve fittings of a certain polynomials functions. The resulting equations require only the addition and multiplication processes; therefore, it can be implemented efficiently on a microprocessor. An extensive angle error analysis...

This paper develops a Finite Element Model (FEM) for 138 kV High Temperature Vulcanized (HTV) Silicone Rubber (SiR) transmission insulator in which, first step, leakage current is calculated different non-uniform continuous and discontinuous pollution deposits then features based on the phase shift between applied voltage are extracted each kind of layer to identify existence dry bands surface....