Fault indicator

About: Fault indicator is a research topic. Over the lifetime, 10057 publications have been published within this topic receiving 143482 citations. The topic is also known as: FCI & power line fault indicator.

Protective relaying methods and apparatus

Abstract: The invention provides methods and apparatus for detecting a single-phase-to-ground fault on a three-phase electrical power system, and for identifying a faulted phase. A single-phase-to-ground fault is correctly distinguished from other faults, including phase-to-phase-to-ground faults, even with transmission lines which utilize series capacitors, by taking into consideration the phase-to-phase voltage which is in quadrature with the voltage to ground of the monitored phase.

Real-time model base fault diagnosis of PV panels using statistical signal processing

Abstract: This paper proposes new method of monitoring and fault detection in photovoltaic systems, based mainly on the analysis of the power losses of the photovoltaic system (PV) by using statistical signal processing. Firstly, real time new universal circuit based model of photovoltaic panels is presented. Then, the development of software fault detection on a real installation is performed under the MATLAB/Simulink environment. With model based fault diagnosis analysis, residual signal from comparing Simulink and real model is generated. To observe clear alarm signal from arbitrary data captured, Wald test technic is applied on residual signal. A model residual based on Sequential Probability Ratio Test (WSPRT) framework for electrical fault diagnosis in PV system is introduced.

An ANN Routine for Fault Detection, Classification, and Location in Transmission Lines

Abstract: This article presents an Artificial Neural Network (ANN) approach to simulate a complete scheme for distance protection of transmission lines. The protection technique is based on a modular approach whereby different neural network modules have been adopted for fault detection, fault classification and fault location. Three-phase voltage and current samples were utilized as inputs for the proposed scheme. The Alternative Transients Program (ATP) software was used to generate data for the transmission line (400 kV). The results obtained show that the global performance of the ANN architectures is highly satisfactory under a wide variety of different fault conditions.

Fault-tolerant control method for actuator and component faults

Abstract: In this paper, a fault-tolerant control method is developed. This method makes possible the compensation of additive or multiplicative actuator and component faults. Its principle is based on the online estimation of a quantity which is equal to zero in the fault-free case and equal to the fault magnitude when a fault occurs on the system. Then, a new control law is added to the nominal one in order to compensate the fault effect on the system. The main advantage of this approach is that it is very easy to implement and it does not require a fault diagnosis module which reduce the computation time and avoid the problems caused by false alarms and delays in the fault detection and isolation. The performances of this method are tested in simulation on a pilot plant.

Fault indicator and means for resetting the same

Abstract: A fault indicator for alternating current distribution systems includes a pair of spaced pole pieces for receiving therebetween at one end the conductor and at the other end a pivoted permanent magnet carrying a target that is biased to a fault indicating position by a stationary permanent magnet. The pole pieces are demagnetized on flow of fault current in the conductor. They are remagnetized by a winding which is energized by discharge of a capacitor that is charged through a rectifier from an oscillator circuit. The winding is carried by a receptacle into which the other ends of the pole pieces are inserted and a circuit is completed thereby to charge the capacitor. The receptacle is carried at one end of a tubular housing the other end of which has an eye to receive a claw of a live line tool for applying the fault indicator to and removing it from the conductor.