Application of wavelet transform in transient protection-case study: busbar protection
09 Apr 2001-pp 197-200
TL;DR: In this article, the application of wavelet transforms to detecting power system faults and describing a number of new protection principles and techniques based on the wavelet transform is presented. But the significant advantages of these protection schemes are outlined in the paper.
Abstract: This paper presents extensive studies of the application of wavelet transforms to detecting power system faults and describes a number of new protection principles and techniques based on the wavelet transform. These include a number of novel protection schemes for the protection of transmission lines, distribution feeders, generators and transformers. The significant advantages of these protection schemes are outlined in the paper. Finally the application of the proposed technique to busbar protection is presented to examine the feasibility of new protective algorithm.
Citations
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14 Nov 2005
TL;DR: In this article, a wavelet-packet transform (WPT) based differential busbar-protection technique is presented, which decomposes the fault signal into different frequency bands in the time domain.
Abstract: A novel wavelet-packet-transform- (WPT-) based differential busbar-protection technique is presented. The paper uses the wavelet-packet- transform (WPT) method to extract features from a fault-current signal. The WPT can decompose the fault signal into different frequency bands in the time domain. The differential signal is computed from the decomposed extracted signal. The WPT-based differential busbar-protection scheme solves several problems of current protective relays. The CT error and ratio-mismatch problems do not have any impact on the proposed WPT-based scheme. ATP simulations are used to test and validate the proposed technique for model-power-system faults.
56 citations
01 Jan 2002
TL;DR: A descriptive overview of the wavelet transform applications in power systems is presented and the main publications carried out in this field have been analyzed and classified by areas.
Abstract: Wavelet transform has received great attention in power community in the last years, because are better suited for the analysis of certain types of transient waveforms than the other transforms approach. This paper presents a descriptive overview of the wavelet transform applications in power systems. The main publications carried out in this field have been analyzed and classified by areas. A list of 116 references is also provided.
46 citations
Cites background or methods from "Application of wavelet transform in..."
...The potential benefits of applying wavelet transform for improving the performance of protection relays have been recognized in recent years [49-80]....
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...The wavelet transform is also applied for the bars [49] , motors [54-57], generators [52]-[53] and transformer protection [58-63], in most of this cases, the spectrum of signals is analysed with the wavelet transform to develop online detection algorithm to detect insulation degradation, inrush and to carry out the precise discrimination between internal and external faults 2....
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TL;DR: In this paper, an extra high-speed busbar protection technique according to the propagation theory of traveling wave is proposed, where the detected initial traveling waves on all connected lines will come from their back, which are defined as positive direction traveling waves.
Abstract: This paper proposes an extra high-speed busbar protection technique according to the propagation theory of traveling wave. When the fault occurs on the busbar, the detected initial traveling waves on all connected lines will come from their back, which are defined as positive direction traveling waves. While a fault occurs on any one of these lines, the detected initial traveling waves on all healthy lines are positive direction traveling waves; however, the traveling wave direction on the faulted line is negative. Within a short duration of postfault, a criterion discriminating fault direction can be established according to the amplitude integral relationships between the positive direction traveling wave and the negative direction traveling wave. Analyzing the detected traveling wave directions for all lines, a distributed busbar protection scheme can be constructed. To evaluate the proposed technique, a typical busbar model was built. Simulation results show that the proposed method can rapidly and reliably discriminate the internal faults from external faults, and the protection performances are immune to fault resistances, fault inception angles, fault types, and current-transformer saturation.
42 citations
TL;DR: In this article, a wavelet transform-based directional algorithm for busbar protection is proposed, which decomposes the current and voltage signals into their first-level details, which consist of frequencies in 500- to 1000-Hz bandwidth, for generating directional signals.
Abstract: This paper proposes a novel wavelet-transform-based directional algorithm for busbar protection. The algorithm decomposes the current and voltage signals into their first-level details, which consist of frequencies in 500- to 1000-Hz bandwidth, for generating directional signals. A high level of computational efficiency is achieved compared to the other wavelet-transform-based algorithms proposed, since only the high-frequency details at the first level are employed in this algorithm. The validity of this method was exhaustively tested by simulating various types of faults on a substation modeled in the alternative transients program/electromagnetic transients program. The algorithm correctly discriminated between bus faults, various types of external faults, and transformer energization even in the presence of current-transformer saturation. This paper also provides the design details of the algorithm using field-programmable gate array technology.
39 citations
Cites methods from "Application of wavelet transform in..."
...used a protection scheme based on wavelet filter banks to extract the windowed average energy spectrum of fault-generated transients so as to distinguish between an internal fault and an external fault [8]....
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TL;DR: In this article, a busbar protection method based on the polarity comparison of superimposed current is proposed, which is shown to have good adaptability, fast operation speed, and high reliability.
Abstract: This paper proposes a novel busbar protection method based on the polarity comparison of superimposed current. Analysis shows that all lines connected to the faulted busbar have the same polarities for the superimposed currents in case of an internal fault to busbar; but for a fault occurring on any one of these lines, the polarity on the faulted line is opposite of those on healthy lines. According to this important characteristic, the busbar protection criterion can be established. To improve the reliability of the busbar protection method, waveforms of superimposed currents are integrated within a short time after the fault. Moreover, a new phase-mode transformation matrix is proposed to realize that single aerial modulus can reflect all fault types. A real 500-kV substation busbar model was built in PSCAD to evaluate the performance of busbar protection. Simulation results demonstrate that the proposed protection method has good adaptability, fast operation speed, and high reliability. In addition, its performance is rarely influenced by the fault initial conditions, series compensation, and CT saturation, etc.
36 citations