scholarly journals Research on Temperature Monitoring Method of Cable on 10 kV Railway Power Transmission Lines Based on Distributed Temperature Sensor

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3705
Author(s):  
Kai Chen ◽  
Yi Yue ◽  
Yuejin Tang
Keyword(s):  
Transmission Lines ◽  
Temperature Sensor ◽  
Power Transmission ◽  
Element Model ◽  
Power Cable ◽  
Operational Experience ◽  
Power Cables ◽  
Power Transmission Lines ◽  
Monitoring Method ◽  
On Line

Railway power transmission lines (RPTL) are power lines that provide nontraction power supply for railways, such as communications and signals along the railway. With the advancement of technology, power cables are being used more and more widely. Operational experience has shown that during the operation of power cables, abnormal heat is often caused by fault factors such as poor joint crimping and severe partial discharge caused by insulation defects, leading to cable burns in extreme cases. Distributed temperature sensors (DTS), a kind of spatial continuous temperature sensor using sensing optical fiber, can measure the temperature along the cable and are expected to realize on-line monitoring and positioning of cable heating faults. This paper first builds a finite element model of the cable under various faults to calculate the distribution characteristics of the temperature field of the faulty cable. Then the results are verified through experiments with the external sensing fiber and the artificially manufactured heating points of the cable. The conclusions show that it is feasible to use a distributed sensing fiber to monitor and locate the heating fault of power cable.

Efficient Vehicle Tracking for Automated Power Line Surveillance System

2014 ◽  
Vol 704 ◽  
pp. 227-232
Author(s):  
Wei Zhen Cheng ◽  
Man Tao Xu ◽  
Wu Chao Cheng
Keyword(s):  
Transmission Lines ◽  
Surveillance System ◽  
Power Transmission ◽  
Power Line ◽  
Normal Operation ◽  
Power Transmission Lines ◽  
Monitoring Method ◽  
Warning Messages ◽  
Routine Inspection ◽  
Line Network

One of the major threats to the safe and normal operation of the power transmission lines is the external force or intrusion incurred by construction trucks. Especially for the urban area, construction of truck cranes is increasingly becoming a leading cause to the damages of power transmission lines. However, the conventional monitoring method for protecting power transmission lines is to conduct a routine inspection or patrol on the transmission line network periodically, which is time-consuming and laborious. In this paper we propose a video surveillance system for automatic tracking the dangerous strength such as construction cranes. The criterion of context formation aims to detect the jib of crane and compute its extension angle. Once the crane is parked over a certain period of time, or the jib extension angle exceeds predefined thresholds, warning messages will be sent to power line supervisors. The experiments show that the system is able to achieve automatic detection of truck cranes and protect transmission lines from their careless constructions.

Analysis 2.5-D Permutation Power Transmission Line to Decrease Electro-Magnetic Influence at High Technology Nano-Fab

2011 ◽  
Vol 356-360 ◽  
pp. 2711-2717
Author(s):  
Yu Lin Song ◽  
Chwen Yu ◽  
Feng Chang Chuang ◽  
Ying Cheng Tseng ◽  
Jyun Yu Zou ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
High Technology ◽  
Power Cable ◽  
Power Transmission Lines ◽  
Working Space ◽  
Innovative Method ◽  
Optimal Permutation ◽  
Electro Magnetic ◽  
The Magnetic Field

We present optimal permutation with 2.5-D power transmission lines system to reduce electro-magnetic influence at high technology nano-Fab. In this study, the magnetic field was lessened by mirror array power cable system, and simulation of results predicted the best permutations to decrease electromagnetic influence (EMI) value below 0.28 mG at working space without any shielding. Furthermore, this innovative method will cost down at high technology nano-Fab especially for 28 nanometer process.

Study on Dynamic Simulation of 4-Bundle Ice-Coated Conductor Galloping Based on 3-D Model

2011 ◽  
Vol 105-107 ◽  
pp. 474-477
Author(s):  
Shi Jing Wu ◽  
Zeng Lei Zhang ◽  
Zhen Hao Liu ◽  
Ji Cai Hu
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Low Frequency ◽  
Element Model ◽  
Wake Flow ◽  
Power Transmission Lines ◽  
Ansys Software ◽  
Frequency Coupling ◽  
D Model ◽  
The Finite Element Model

Galloping of power transmission lines is a low frequency self-oscillation with large amplitude. The aerodynamic effect on each sub-conductor of 4-bundle conductor is different due to wake-flow-influence. In order to explore the reasons leading to galloping, a 3-D model for power transmission line is built. A two-node quadratic beam element in 3-D and a structure mass element are applied to establish the finite element model of iced 4-bundle conductor in ANSYS software. Then dynamic transient response calculations are made on this model. According to the results, difference in vibration of sub-conductors and frequency coupling of torsional and transverse vibration can be confirmed. The simulation results illustrate the wake-flow-influence effect and the coupled motions effect on galloping of 4-bundle conductor.

scholarly journals Control of EMI in High-Technology Nano Fab by Exploitation Power Transmission Method with Ideal Permutation

2021 ◽  
Vol 11 (24) ◽  
pp. 11984
Author(s):  
Yu-Lin Song ◽  
Manoj Kumar Reddy ◽  
Hung-Yi Lin ◽  
Luh-Maan Chang
Keyword(s):  
Magnetic Fields ◽  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Power Transmission ◽  
High Technology ◽  
Power Cable ◽  
Power Transmission Lines ◽  
Transmission Method ◽  
Additional Energy ◽  
The Ideal

There are many high-power electrical cables around and within semiconductor foundries. These cables are the source of extremely low-frequency (ELF < 300 Hz) magnetic fields that affect the tools which operate by the function of electronic beams. Miss operation (MO) happens because the ELF magnetic fields induce beam shift during the measurement or process for cutting-edge chips below 40 nm. We present the optimal permutation of power transmission lines to reduce electromagnetic influence in high-technology nano fabs. In this study, the magnetic field was reduced using a mirror array power cable system, and simulation results predicted the best permutations to decrease the electromagnetic interference (EMI) value to below 0.4 mG in a working space without any shielding. Furthermore, this innovative method will lower the cost of high-technology nano fabs, especially for the 28 nm process. The motivation behind this paper is to find the ideal permutation of power transmission lines with a three-phase, four-cable framework to decrease the EMI in high-technology nano fabs. In this study, the electromagnetic interference was diminished using the ideal-permutation methodology without investing or using additional energy, labor, or apparatus. Moreover, this advanced methodology will help increase the effectiveness and reduce the costs of nano fabs. The mathematical and experimental results of the study are presented with analysis.

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