A reliable and accurate diagnosis of inter-turn short circuit faults is a challenging problem in the area of fault diagnosis of electrical machines. The purpose of this challenge is to be more efficient in fault detection and to provide a reliable method with low-cost sensors and simple numerical algorithms which not only detect the occurrence of the fault, but also locate its position in the w...

Electromagnetic forces in power transformer windings are produced by interaction between the leakage fluxes and current passing them. Since the leakage flux distribution along the windings height is in two axial and radial directions, so the electromagnetic forces have two components, radial and axial. There is a risk that a large electromagnetic force due to the short circuit or inrush current...

|Transient stability investigations consist of studying the rotor oscillations of generators (electro-mechanic oscillations, 0.1-2 Hz) after the occurrence of a fault of large amplitude, e.g. short circuit. The goal is to indicate if the generators are capable to stay synchronous after a fault has occurred. The fault duration is one of the most important factors to be determined. In fact, the s...

A new method for short-circuit fault location is proposed. The based on instantaneous signal measurement and its first second derivatives, which are the novel elements of current approach. derivatives allow associating a precise time stamp to occurrence fault. Due retardation phenomena, difference between times in registered two detectors can be used locate We offer several mathematical models ...

This paper presents a support vector machine (SVMs) approach for locating and diagnosing faults in electric power distribution feeders. The proposed approach is based on the measurements available at the substation and remote terminal units (RTUs). To illustrate the proposed methodology, a practical distribution feeder emanating from 132/11KV-grid substation in India with loads is considered. T...

An appropriate method for fault identification and classification on extra high voltage transmission line using discrete wavelet transform is proposed in this paper. The sharp variations of the generated short circuit transient signals which are recorded at the sending end of the transmission line are adopted to identify the fault. The threshold values involve fault classification and these are...

This paper presents a fault location technique for transmission lines with minimum current measurement. This algorithm investigates proper current ratios for fault location problem based on thevenin theory in faulty power networks and calculation of short circuit currents in each branch. These current ratios are extracted regarding lowest sensitivity on thevenin impedance variations of the netw...

This paper addresses the problem of fault detection and isolation in railway track circuits. A track circuit can be considered as a large-scale system composed of a series of trimming capacitors located between a transmitter and a receiver. A defective capacitor affects not only its own inspection data (short circuit current) but also the measurements related to all capacitors located downstrea...

ro determine whether an integrated digital circuit is working properly, one may apply to the circuit a set of· well-devised test sequences and compare the resultant outputs with the corresponding correct outputs. Any discrepancies indicate the presence of a fault. The main task here is to find a set of test sequences which can detect the presence of any prescribed fault in the circuit. This tes...

This paper presents the design of a Superconducting Fault Current Limiter (SFCL) and calculation results forces stresses in windings resistive fault current limiter. The limiter consists two parallelly connected magnetically coupled windings, cooled by single stage cryocooler. Magnetically compensated made HTS tape give very low voltage on at nominal current. Limitation short-circuit time value...