Study on Preventing Override Trip System for High-Voltage Power Grid of Coal Mine Underground Based on the Ethernet

2012 ◽  
pp. 1059-1065
Author(s):  
Yu-mei Wang ◽  
Yi-du Guo
Keyword(s):  
High Voltage ◽  
Coal Mine ◽  
Power Grid

Research of Adaptive Line Selection Leakage Protection Based on DSP in Mine

2011 ◽  
Vol 143-144 ◽  
pp. 14-18
Author(s):  
Dan Xu ◽  
Zhan Zhang
Keyword(s):  
High Voltage ◽  
Coal Mine ◽  
Power Supply ◽  
Power Grid ◽  
Protection System ◽  
Direct Power ◽  
Supply Condition ◽  
Line Selection ◽  
Phase Sensitive

In view of the present our country coal mine high-voltage power grid widely used 6kV or 10kV cable direct power supply condition. To describe a DSP-based adaptive line selection leakage protection program of high-voltage power grid. It adopts under-compensation, adaptive random tuning and phase-sensitive comparison to judge the fault branch and achieve selective leakage protection, and make the protection system more perfect and reliable.

Study on Preventing Override Trip System for High-Voltage Power Grid of Coal Mine Underground Based on the EtherCAT

2013 ◽  
Vol 273 ◽  
pp. 389-393
Author(s):  
Yu Mei Wang ◽  
Xu Yang ◽  
Hao Zhang
Keyword(s):  
High Voltage ◽  
Coal Mine ◽  
Power Supply ◽  
Power Supply System ◽  
Short Circuit ◽  
Power Grid ◽  
Supply System ◽  
Quality Requirements ◽  
Master Station ◽  
Short Circuit Fault

When the power supply system for coal mine underground take place a short circuit fault, multilevel switch often respond at the same time. And the existing comprehensive protector cannot satisfy the real-time and rapid quality requirements of preventing override trip system for high-voltage power grid of coal mine underground. So this paper put forward the research for comprehensive protector of preventing override trip based on the EtherCAT. This paper first analyzes the principle and characteristics of the EtherCAT technology; and then puts forward the overall scheme of preventing override trip system; Finally, study and design the slave station and master station of preventing override trip system based on the EtherCAT.

UHV AC and DC Coordinated Operation Techniques Based on Continuous Simulation

2015 ◽  
Vol 713-715 ◽  
pp. 1347-1350
Author(s):  
Yu Fei Rao ◽  
Lin Lin Yu
Keyword(s):  
Theoretical Analysis ◽  
High Voltage ◽  
Power Grid ◽  
Double Pole ◽  
Continuous Simulation ◽  
Operation Techniques ◽  
Load Mode ◽  
Typical Method ◽  
Ultra High Voltage

In the process of China's ultra high-voltage (UHV) construction, Henan UHV power grid is the important part. Summer great load mode of Henan power gird is chosen as the typical method. In the background of completing Nanyang UHV extension project, based on single pole running and double pole running of Hami-Zhengzhou UHVDC project respectively, it is simulated and analyzed. The results indicate that power grid cannot maintain stability when single pole block fault or double pole block fault occurs. Through theoretical analysis and simulation, under UHV AC running certain limit, HVDC latching grid is stable. Under UHV DC running certain limit, HVDC latching grid is stable. Based on continuous simulation, this paper obtained the coordinated operation of area UHV AC and DC.

scholarly journals Analysis of Various ESDD of Contaminant Insulator Flashover Acoustic Signal by Wavelet Packet

2016 ◽  
Vol 16 (6) ◽  
pp. 220-231
Author(s):  
Hong Kun Wang ◽  
Shou Xiang Wang ◽  
Jing Nie
Keyword(s):  
High Voltage ◽  
Acoustic Signal ◽  
Wavelet Packet ◽  
Power Grid ◽  
Acoustic Signals ◽  
Salt Deposit ◽  
Power Network ◽  
Large Power ◽  
Insulator Flashover

Abstract With the formation of China’s large power grid, the security of the network is particularly important. The contaminant flashover of insulators has a serious impact on the operation safety of a high voltage power network. In this paper, the acoustic signals’ characteristics of the contaminant insulators flashover are analyzed, and, as a result, the correlation between the acoustic signal and the contaminant insulator flashover is established. To experiment with contaminant insulator for three different Equivalent Salt Deposit Densities (ESDD), acoustic signals were collected separately. Then, the contaminant insulators’ acoustic signals of flashover were analyzed by wavelet packet. The characteristics of the signals were obtained, and they can be judged for contaminant flashover warning.

scholarly journals A 100‐year Geoelectric Hazard Analysis for the U.S. High‐Voltage Power Grid

Space Weather ◽  
2020 ◽  
Vol 18 (2) ◽  
Author(s):  
G. M. Lucas ◽  
J. J. Love ◽  
A. Kelbert ◽  
P. A. Bedrosian ◽  
E. J. Rigler
Keyword(s):  
High Voltage ◽  
Hazard Analysis ◽  
Power Grid ◽  
The U.S
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