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Research on transformer protection based on wavelet neural network and FPGA
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作者 WANG Zhi-wen GONG Mao-fa AN Bin LI Lan-bing LIU Tao 《Journal of Measurement Science and Instrumentation》 CAS 2014年第2期76-79,共4页
The paper expounds importance of the transformer protection and analyzes the magnetizing inrush current produce condition. A comprehensive prevention based on the wavelet neural network methods for identification the ... The paper expounds importance of the transformer protection and analyzes the magnetizing inrush current produce condition. A comprehensive prevention based on the wavelet neural network methods for identification the magnetizing inrush current is put forward in this paper. Based on a lot of simulations, it can be drawn that sympathetic inrush waveform has no obvious difference with that of the inrush current. According to the characteristics of wavelet neural networks' huge computation and high sampling rate, a new method based on FPGA of a high-speed hardware platform is proposed to realise the algorithm. Utilizing technologies of wavelet neural networks and FPGA, the accuracy and real-time data processing speed of the protection device can be more effective. In a word, the research has high theoretical and practical value in the further improvement of transformer protection. 展开更多
关键词 wavelet neural network transformer protection FPGA DSP
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Knowledge-based Convolutional Neural Networks for Transformer Protection 被引量:1
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作者 Zongbo Li Zaibin Jiao Anyang He 《CSEE Journal of Power and Energy Systems》 SCIE CSCD 2021年第2期270-278,共9页
Deep learning based transformer protection has attracted increasing attention.However,its poor generalization abilities hinder the application of deep learning in the power system owing to the limited training samples... Deep learning based transformer protection has attracted increasing attention.However,its poor generalization abilities hinder the application of deep learning in the power system owing to the limited training samples.In order to improve its generalization abilities,this paper proposes a knowledge-based convolutional neural network(CNN)for the transformer protection.In general,the power experts can reliably discriminate between faulty transformers and healthy transformers only through the unsaturated parts of equivalent magnetization curve(voltage of magnetizing branch-differential current curve)but deep learning intends to focus on the combined features of saturated and unsaturated parts.Inspired by the identification process of power experts,CNN adopted a specially designed loss function in this paper which is used to identify the running states of power transformers.Specifically,the presented Restrictive Weight Sparsity substitutes a special regularization term for the common LI regularization.The presented Adaptive Sample Weight Adjustment endows the softmax loss of each sample with the optimizable weight the softmax loss of each sample with the optimizable weights to increase the impact of more-difficult-to-identify cases on the training process.With the modified loss function,the knowledge is abstractly introduced into the training process of CNN so as to successfully imitate the identification process of power experts.Accordingly,the proposed knowledge-based CNN will pay more attention to the unsaturated parts of equivalent magnetization curve even if only limited samples are included in the training process.The results of simulations and dynamic model experiments reveal that the knowledge-based CNN exhibits an improved generalization ability and the knowledge-based deep learning algorithm is a promising research direction. 展开更多
关键词 Convolutional neural network equivalent magnetization curve generalization ability knowledge transformer protection
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A denoising-classification neural network for power transformer protection 被引量:2
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作者 Zongbo Li Zaibin Jiao +1 位作者 Anyang He Nuo Xu 《Protection and Control of Modern Power Systems》 2022年第1期801-814,共14页
Artificial intelligence(AI)can potentially improve the reliability of transformer protection by fusing multiple features.However,owing to the data scarcity of inrush current and internal fault,the existing methods fac... Artificial intelligence(AI)can potentially improve the reliability of transformer protection by fusing multiple features.However,owing to the data scarcity of inrush current and internal fault,the existing methods face the problem of poor generalizability.In this paper,a denoising-classification neural network(DCNN)is proposed,one which inte-grates a convolutional auto-encoder(CAE)and a convolutional neural network(CNN),and is used to develop a reli-able transformer protection scheme by identifying the exciting voltage-differential current curve(VICur).In the DCNN,CAE shares its encoder part with the CNN,where the CNN combines the encoder and a classifier.Based on the inter-action of the CAE reconstruction process and the CNN classification process,the CAE regards the saturated features of the VICur as noise and removes them accurately.Consequently,it guides CNN to focus on the unsaturated features of the VICur.The unsaturated part of the VICur approximates an ellipse,and this significantly differentiates between a healthy and faulty transformer.Therefore,the unsaturated features extracted by the CNN help to decrease the data ergodicity requirement of AI and improve the generalizability.Finally,a CNN which is trained well by the DCNN is used to develop a protection scheme.PSCAD simulations and dynamic model experiments verify its superior performance. 展开更多
关键词 transformer protection Exciting voltage-differential current curve Convolutional auto-encoder Convolutional neural network Denoising-classification neural network
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A Testing Method for Ratio Restraint Characteristics of Differential Relay Protection of Transformers
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作者 Cao Zhihui Peng Chunyan Zhou Huaping 《Electricity》 2012年第5期44-47,共4页
In this paper, a method to calculate the slope of the ratio restraint characteristic of a transformer differential relay protection is proposed. The method allows using some concise but effective means to get the slop... In this paper, a method to calculate the slope of the ratio restraint characteristic of a transformer differential relay protection is proposed. The method allows using some concise but effective means to get the slope. Modulating the argument of current output from ONLLY testing equipment can make the relay protection device operate, thus, the data used for calculation would be obtained naturally after several trails. In order to make sure how effective that method could be, some experiment data is given as well. 展开更多
关键词 differential relay slope of ratio restraint characteristic relay testing relay protection of transformer
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Waveform feature monitoring scheme for transformer differential protection
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作者 Bahador FANI Mohamad Esmail HAMEDANI GOLSHAN Hosein ASKARIAN ABYANEH 《Journal of Zhejiang University-Science C(Computers and Electronics)》 SCIE EI 2011年第2期116-123,共8页
We propose a new scheme for transformer differential protection. This scheme uses different characteristics of the differential currents waveforms (DCWs) under internal fault and magnetizing inrush current conditions.... We propose a new scheme for transformer differential protection. This scheme uses different characteristics of the differential currents waveforms (DCWs) under internal fault and magnetizing inrush current conditions. The scheme is based on choosing an appropriate feature of the waveform and monitoring it during the post-disturbance instants. For this purpose, the signal feature is quantified by a discrimination function (DF). Discrimination between internal faults and magnetizing inrush currents is carried out by tracking the signs of three decision-making functions (DMFs) computed from the DFs for three phases. We also present a new algorithm related to the general scheme. The algorithm is based on monitoring the second derivative sign of DCW. The results show that all types of internal faults, even those accompanied by the magnetizing inrush, can be correctly identified from the inrush conditions about half a cycle after the occurrence of a disturbance. Another advantage of the proposed method is that the fault detection algorithm does not depend on the selection of thresholds. Furthermore, the proposed algorithm does not require burdensome computations. 展开更多
关键词 transformer differential protection Differential current waveform Inrush current Fault current Waveform feature Waveform processing
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IEC61850 standard-based harmonic blocking scheme for power transformers 被引量:9
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作者 Senthil Krishnamurthy Bwandakassy Elenga Baningobera 《Protection and Control of Modern Power Systems》 2019年第1期123-137,共15页
Transformer Differential and overcurrent schemes are traditionally used as main and backup protection respectively. The differential protection relay (SEL487E) has dedicated harmonic restraint function which blocks th... Transformer Differential and overcurrent schemes are traditionally used as main and backup protection respectively. The differential protection relay (SEL487E) has dedicated harmonic restraint function which blocks the relay tripping during the transformer magnetizing inrush conditions. However, the backup overcurrent relay (SEL751A) applied to the transformer protection does not have harmonic restraint element and trip the overcurrent relay during the inrush conditions. Therefore, major contribution of this research work is the developed harmonic blocking scheme for transformer which uses element (87HB) of the transformer differential relay (SEL487E) to send an IEC61850 GOOSE-based harmonic blocking signal to the backup overcurrent relay (SEL751A) to inhibit from tripping during the transformer magnetizing inrush current conditions. The simulation results proved that IEC61850 standard-based protection scheme is faster than the hardwired signals. Therefore, the speed and reliability of the transformer scheme are improved using the IEC61850 standard-based GOOSE applications. 展开更多
关键词 transformer protection Overcurrent protection Digital protection scheme Current differential protection transformer magnetizing inrush current Harmonic blocking IEC 61850 GOOSE message
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