Study on Travelling-wave protection Starting element

Ren, Li; Shi, Shan; Wang, Shiyong; Luo, Shuxin; Dong, Xianguang

doi:10.1109/apap.2011.6180827

Cited by 4 publications

(2 citation statements)

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“…Three-phase current signals in the frequency band of 3-10kHz can be used to form the startup element [27][28][29]. After being filtered by a band-pass filter of 3-10kHz, the three-phase current signals are compared with the start threshold, and if one of the current signals exceeds the start threshold, a start signal will be given out.…”

Section: A Startup Elementmentioning

confidence: 99%

A New Differential Protection of Transmission Line Based on Equivalent Travelling Wave

Tang

Xiang

Luo

et al. 2017

IEEE Trans. Power Delivery

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Differential protection is widely used for transmission lines, but its performance is affected by distributed capacitance current and current transformer (CT) saturation. Travelling wave (TW) differential protection is immune to these factors and can achieve ultra-high-speed operation. These characteristics are essential for long-distance extra/ultra-high-voltage (EHV/UHV) transmission line protection. However, the contradiction between sampling frequency and communication traffic makes it hard to ensure high sensitivity and high reliability at the same time. To solve this problem, a new TW differential protection based on equivalent travelling wave (ETW) is proposed in this paper. Wavelet transform is adopted to extract wavelet transform modulus maxima (WTMM) of TW, which are used to reconstruct ETW. Only several WTMMs need to be exchanged with the opposite terminal, so the amount of communication is largely reduced. Current energy ratio is defined and used for operation criterion to enhance the sensitivity during faults with large fault resistance and small fault inception angle. Detailed discussions on the selection of setting value ensure the reliability of the proposed protection scheme. Extensive simulations are conducted to test the performance of the protection. Simulation results verify that the protection can correctly discriminate between internal and external faults with high sensitivity and reliability.

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Section: A Startup Elementmentioning

confidence: 99%

A New Differential Protection of Transmission Line Based on Equivalent Travelling Wave

Tang

Xiang

Luo

et al. 2017

IEEE Trans. Power Delivery

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“…At present, the commonly used state evaluation methods for UHV oil-immersed shunt reactors are mostly based on a certain factor or several factors to make judgments, without a comprehensive consideration of the overall operating condition information of the shunt reactors [8][9][10] . There are various uncertainties in the process of fault diagnosis and state evaluation of the shunt reactors, and the accuracy and timeliness of the diagnosis results are poor.…”

Section: Introductionmentioning

confidence: 99%

Operating State Evaluation Method of UHV Oil Immersed Shunt Reactors

Gu,

et al. 2023

J. Phys.: Conf. Ser.

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The oil-immersed shunt reactor is one of the most important reactive power compensation equipment in the ultra-high voltage (UHV) long-distance transmission and transformation system, which can solve the problem of large power and long-distance transmission that makes the capacitance effect of transmission lines obvious. At present, the commonly used state evaluation methods for UHV oil-immersed shunt reactors are mostly based on a certain factor or several factors to make judgments, without a comprehensive consideration of the overall operating condition information of the shunt reactors. There are various uncertainties in the process of fault diagnosis and state evaluation of the shunt reactors, and the accuracy and timeliness of the diagnosis results are poor. To solve the above problems, this paper combines the key characteristic parameters of oil immersed shunt reactor, such as vibration, chromatography, partial discharge, and oil temperature, and establishes a comprehensive evaluation method for the operating state of oil immersed shunt reactor based on Gaussian Cloud Model (GCM), and verifies its effectiveness through test data, whose R2 over 0.98. The test data show that this method can effectively judge the operation state of the UHV oil-immersed shunt reactor, which accuracy rate of state diagnosis is over 91%. The results of this paper can provide technical support for the application of UHV oil-immersed shunt reactor state assessment and diagnosis, and further improve the level of equipment operation and maintenance.

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