Application of Wavelet Transform for IEC-61850 based Busbar Protection
01 Dec 2019-Vol. 2019, pp 1-4
TL;DR: The results obtained from the proposed algorithm show its high responsiveness for bus faults and firmness against external faults and the feasibility of on-field implementation of the proposed scheme for IEC-61850 applications has been discussed.
Abstract: A wavelet transform approach to IEC-61850 based busbar protection has been proposed in this paper. Initially, areal mode current travelling waves (TWs) are calculated using Karenbauer phase-modal transformation. Thereafter, the postfault initial travelling wavefronts in the form of wavelet transform modulus Maximas (WTMMs) have been extracted using level-1 detailed coefficients of Daubechies-1 wavelet. In order to evaluate performance of the proposed scheme, an existing 400-kV Indian substation with double-busbar arrangement has been developed. The results obtained from the proposed algorithm show its high responsiveness for bus faults and firmness against external faults. At the end, the feasibility of on-field implementation of the proposed scheme for IEC-61850 applications has been discussed.
Citations
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01 Aug 2018
TL;DR: The obtained results reveal the proposed 87BW function provides ultra-high-fast trip for internal and evolving external-to-internal faults, guaranteeing security for normal through-load and external faults as well, even in the case of early and severe current transformer saturation.
Abstract: This paper presents a new wavelet-based busbar differential protection algorithm, named as 87BW function. The instantaneous current-based differential protection fundamentals are taken into account and the well-known 1-out-of-1 and 2-out-of-2 tripping logics are mapped into the wavelet domain. Operating and restraint wavelet coefficients energy of currents are computed, regarding station configuration and bus zones boundaries. Thereby, the proposed 87BW function can be properly used in both static and dynamic busbar configuration. Its performance was evaluated through EMTP-based simulations of faults in a 230 kV power substation with double bus single breaker configuration. The obtained results reveal it provides ultra-high-fast trip for internal and evolving external-to-internal faults, guaranteeing security for normal through-load and external faults as well, even in the case of early and severe current transformer (CT) saturation.
12 citations
References
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TL;DR: A method of symmetrical component analysis for the detection of current-transformer saturation in a numerical current differential feeder protection relay shows significant improvement in sensitivity on internal faults while still maintaining a high level of stability on external faults and nonfault events.
Abstract: A method of symmetrical component analysis for the detection of current-transformer (CT) saturation in a numerical current differential feeder protection relay is presented in this paper. The performance of the differential relay is investigated for various faults on a typical Electro-Magnetic Transients Program/Alternative Transients Program (EMTP/ATP) simulated transmission feeder. The simulator includes the effects of CT saturation. A comparison between simulation and tests conducted on an analog model testbench are also evaluated. The results show a high degree of similarity and illustrate the effect that CT saturation imposes on the sensitivity and stability of the protection scheme. An algorithm is presented that shows significant improvement in sensitivity on internal faults while still maintaining a high level of stability on external faults and nonfault events.
87 citations
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
TL;DR: The implementation and testing of a superimposed directional comparison technique for bus protection based on an IEC61850 process bus is investigated and design, hardware implementation, and related issues of DCBPU are described.
Abstract: A directional comparison bus protection unit (DCBPU) can provide a high speed bus fault clearing in the IEC61850 process-bus environment. This technique is based on superimposed fault direction for each circuit connected to the protected bus. In this paper, the implementation and testing of a superimposed directional comparison technique for bus protection based on an IEC61850 process bus is investigated. Design, hardware implementation, and related issues of DCBPU are described. A unique test setup is proposed and developed for testing DCBPU, including merging unit simulator, traffic generator, prototype DCBPU, and Ethernet switches to simulate the real IEC 61850-based substation automation process bus. Test results are reported.
42 citations
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
"Application of Wavelet Transform fo..." refers background in this paper
...A high-speed travelling wave-based scheme has been presented in [18]....
[...]
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
"Application of Wavelet Transform fo..." refers background in this paper
...Wavelet transform-based schemes [19]–[23] extract information about the fault characteristics based on the post-fault wavelet coefficients....
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