Topic
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.
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TL;DR: In this article, an accurate fault-location algorithm has been obtained for the line-to-line fault as an extension of the author's previous work for line to ground fault location.
Abstract: From a direct three-phase circuit analysis, an accurate fault-location algorithm has been obtained for the line-to-line fault as an extension of the author's previous work for line-to-ground fault location. Robustness of the proposed algorithm to load impedance uncertainty is enhanced by the introduction of impedance compensation using voltage and current measurements. Simulation results show a high degree of accuracy and robustness to load uncertainty.
105 citations
Proceedings Article•
01 Jan 1986
105 citations
TL;DR: It is shown that, in the case of machines with one or several broken bars, the IF of the LSHst exhibits a very characteristic and easy to identify pattern, which is physically justified, and a universal fault indicator can be defined.
Abstract: In this paper, a new method for detecting the presence of broken rotor bars is presented. The proposed approach is valid for induction machines started at constant frequency and consists of extracting the instantaneous frequency (IF) of the left sideband harmonic (LSH) from the start-up current (LSHst), via the Hilbert transform. It is shown that, in the case of machines with one or several broken bars, the IF of the LSHst exhibits a very characteristic and easy to identify pattern, which is physically justified. This paper also shows that, if the IF of the LSHst is represented against the slip, a universal fault indicator (nondependent neither on the machine characteristics nor on the starting conditions) can be defined. This fault indicator consists of the correlation between the experimental IF of the LSHst and its theoretical evolution. This approach is theoretically introduced and experimentally validated by testing a commercial motor in faulty and healthy conditions, under different operating conditions.
105 citations
TL;DR: In this article, a wide-area backup protection algorithm based on the fault component voltage distribution is proposed to overcome the problems of complex setting and maloperation under flow transfer of conventional backup protection.
Abstract: A new wide-area backup protection algorithm based on the fault component voltage distribution is proposed in this paper. It is helpful to overcome the problems of complex setting and maloperation under flow transfer of conventional backup protection. The measured values of fault component voltage and current at one terminal of the transmission line are applied to estimate the fault component voltage at the other terminal. Then, the fault element can be identified by the ratio between the measured values and the estimated values. In addition, the speed of fault element identification can be accelerated by a faulted area detection scheme. The proposed method has the advantage of easy setting and low requirement for synchronized wide-area data. The studies performed on the IEEE 39-bus system validate the proposed algorithm under various faults and flow transfer.
105 citations
TL;DR: Using local voltage and current data, a least square-based technique estimates the parameter of the fault path, from which the direction of the faults is inferred and is found to be more accurate compared to available technique.
Abstract: In a smart dc microgrid, power electronic devices limit the current during fault and therefore, an overcurrent-based relaying scheme cannot provide required sensitivity and selectivity for such a system. For a dc microgrid with ring configuration having bidirectional power flow, the protection design is further complicated. For reliable supply to customers and to avoid unwanted disconnection of renewable resources, selectivity of a protection scheme is important. In this paper, using local voltage and current data, a least square-based technique estimates the parameter of the fault path, from which the direction of the fault is inferred. Using the direction of fault information of both ends of a line segment in a ring system, internal and external faults are discriminated for network protection. Using PSCAD/EMTDC simulations for a ring system, proposed method is tested for various fault situations including high resistance fault, close-in fault, signals with noise, and considering different modes of distributed generation operations. The proposed algorithm is also validated on a scaled-down hardware setup in the laboratory. The method is found to be more accurate compared to available technique.
105 citations