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.

Multiple hypotheses and their credibility in on-line fault diagnosis

Abstract: In this study, a new method that handles multiple hypotheses is presented for fault diagnosis using sequence of event recorders (SERs). To quantify the certainty of hypotheses, a method to calculate their credibility is provided. The proposed techniques are integrated in a generalized alarm analysis module (GAAM) and have been tested with numerous scenarios from the Italian power system.

Fault location in electric power delivery systems

Abstract: Accurately calculating location of a fault even on a branched, non-homogenous, radial electric power distribution system. The calculation includes determining a calculated reactance or impedance to the fault, and uses the line parameters to determine locations on the system that match the calculated reactance to the fault. The calculation may further include a determination of faulted phase and eliminate fault location possibilities based on absence of the faulted phase at those locations. The calculation may further use data reported from line monitors such as faulted circuit indicators (FCIs).

Open-Switch Fault-Diagnostic Method for Back-to-Back Converters of a Doubly Fed Wind Power Generation System

Abstract: In order to improve the reliability and availability of the converters of wind turbines, condition monitoring and fault diagnosis are considered crucial means to achieve these goals. In this text, according to the current variation characteristics of the converter, this paper presents a novel approach for real-time diagnostics of open-switch faults in back-to-back converters of a doubly fed wind turbine. The average value of the normalized converter phase currents and the absolute normalized currents are used as principal quantities to formulate the diagnostic variables. The proposed fault-diagnostic variables prove to be carrying information about multiple open-switch faults. In addition to, by the combination of these variables with the average absolute values of the normalized converter phase currents, an adaptive fault-diagnostic threshold is proposed, which ensures the robustness of the diagnosis of single and double open-switch faults. Finally, through the diagnostic variables and the adaptive threshold, the dynamic fault-diagnostic method for open-switch faults in the back-to-back converter of a doubly fed wind turbine is formed. The simulation and experimental results also indicate that the fault-diagnostic method can not only diagnose the multiple open-circuit faults of a back-to-back converter, but also have a better robustness.

Nonlinear neural network fault detection system and method

Abstract: A system and method for fault detection is provided. The fault detection system provides the ability to detect symptoms of fault in turbine engines and other mechanical systems that have nonlinear relationships. The fault detection system uses a neural network to perform a data representation and feature extraction where the extracted features are analogous to principal components derived in a principal component analysis. This neural network data representation analysis can then be used to determine the likelihood of a fault in the system.

Fault indicator with improved flag indicator assembly

Abstract: A fault indicator for indicating the occurrence of a fault current in a power distribution system includes a rotatably mounted indicator flag. The indicator flag is actuated through successive 90° trip and reset positions by a compact magnetic pole piece assembly having four radially extending magnetic pole segments which interact with four similarly aligned magnetic poles on the indicator flag. A pair of bidirectional windings on two of the pole segments magnetizes the pole segments to rotate the flag between successive trip and reset positions. Extensions on the two pole segments along the circumference of the indicator flag provide for positive rotation of the flag in a predetermined direction.