High-speed Protection Method for DC Transmission Lines Using Fault Current Initial Traveling Wave

2020 ◽  
Author(s):  
Chenhao Zhang ◽  
Guobing Song ◽  
Xinzhou Dong
Keyword(s):  
Transmission Lines ◽  
Traveling Wave ◽  
High Speed ◽  
Fault Current ◽  
Protection Method

A Novel Design of Traveling Wave Protection Device in EHV Transmission Lines Based-On ARM and FPGA

2013 ◽  
Vol 313-314 ◽  
pp. 291-295
Author(s):  
Hui Zhong Wang ◽  
Chen Yu Sun
Keyword(s):  
Wavelet Analysis ◽  
Real Time ◽  
Transmission Lines ◽  
Traveling Wave ◽  
High Speed ◽  
Travelling Wave ◽  
Protection Device ◽  
Machine Interface ◽  
Novel Design ◽  
Microcomputer Protection

As it is difficult to realize the traveling wave protection principle based on wavelet analysis in microcomputer protection device, a new microcomputer protection architecture based on FPGA+ARM is put forward in this paper This architecture make full use of ARM to complete relay protection principle, communication and the realization of the man-machine interface for the powerful transaction processing ability, and make use of FPGA to complete complex real-time wavelet analysis by a logic circuit for the characteristics of FPGA in high speed real-time parallel computation. It proves in experiment that this scheme is a good solution for the realization of travelling wave protection.

Ultra-high-speed protection of transmission lines using traveling wave theory

2016 ◽  
Vol 132 ◽  
pp. 94-103 ◽  
Author(s):  
Saeid Hasheminejad ◽  
Seyed Ghodratollah Seifossadat ◽  
Morteza Razaz ◽  
Mahmood Joorabian
Keyword(s):  
Transmission Lines ◽  
Traveling Wave ◽  
High Speed ◽  
Wave Theory ◽  
Ultra High Speed

A Novel Transient Directional Unit Based on Adaptive Median Filtering

2012 ◽  
Vol 433-440 ◽  
pp. 4500-4505
Author(s):  
Ren Wang He ◽  
Yi Bo Yang
Keyword(s):  
Transmission Lines ◽  
Time Domain ◽  
Traveling Wave ◽  
High Speed ◽  
Power Transmission ◽  
Median Filtering ◽  
Power Transmission Lines ◽  
Short Period ◽  
Transient Energy ◽  
The Time Domain

A new transient directional unit for extra high voltage(EHV) power transmission lines is proposed, which identifies fault direction by means of comparing the time-domain transient energy of the forward traveling-wave with that of the backward one in the very short period of time after fault occurs. The unit algorithm is designed with the technology of adaptive median filtering, which is first employed to process the forward and backward traveling-waves, and then calculates the time-domain transient energy ratio of the forward traveling-wave to the back one, by which the fault direction is discriminated. Numerous ATP-EMTP simulation tests show that this proposed directional unit not only operates reliably, sensitively and ultra-high-speed, but also endure the influences of various factors, including different fault types, fault locations, transition resistances or fault inception angles. It will be worthy of application greatly.

A Novel Fault-location Method for HVDC Transmission Lines Based on Concentric Relaxation Principle and Wavelet Packet

2020 ◽  
Vol 13 (5) ◽  
pp. 705-716
Author(s):  
Congshan Li ◽  
Ping He ◽  
Feng Wang ◽  
Cunxiang Yang ◽  
Yukun Tao ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Traveling Wave ◽  
Fault Location ◽  
Wave Attenuation ◽  
Wavelet Packet ◽  
Low Frequency ◽  
Evaluation Process ◽  
Location Method ◽  
Hvdc Transmission ◽  
Instantaneous Energy

Background: A novel fault location method of HVDC transmission line based on a concentric relaxation principle is proposed in this paper. Methods: Due to the different position of fault, the instantaneous energy measured from rectifier and inverter are different, and the ratio k between them is the relationship to the fault location d. Through the analysis of amplitude-frequency characteristics, we found that the wave attenuation characteristic of low frequency in the traveling wave is stable, and the amplitude of energy is larger, so we get the instantaneous energy ratio by using the low-frequency data. By using the method of wavelet packet decomposition, the voltage traveling wave signal was decomposed. Results: Finally, calculate the value k. By using the data fitting, the relative function of k and d can be got, that is the fault location function. Conclusion: After an exhaustive evaluation process considering different fault locations, fault resistances, and noise on the unipolar DC transmission system, four-machine two-area AC/DC parallel system, and an actual complex grid, the method presented here showed a very accurate and robust behavior.

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