Calculation of surface electric field on UHV transmission lines under lightning stroke

2013 ◽  
Vol 94 ◽  
pp. 79-85 ◽  
Author(s):  
Zhanqing Yu ◽  
Qian Li ◽  
Rong Zeng ◽  
Jinliang He ◽  
Yong Zhang ◽  
...  
Keyword(s):  
Electric Field ◽  
Transmission Lines ◽  
Lightning Stroke ◽  
Surface Electric Field ◽  
Uhv Transmission Lines

An Electroscope System Based on Electric Field Measurement Method for UHV Transmission Lines

2009 ◽  
Vol 10 (2) ◽  
Author(s):  
Fan Yang ◽  
Wei He ◽  
Tao Chen ◽  
Xiaochu Luo ◽  
Yongchang Fu
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Transmission Lines ◽  
Field Measurement ◽  
Measurement Method ◽  
Electric Field Measurement ◽  
Set Up ◽  
Global Regularization ◽  
Uhv Transmission Lines ◽  
Internet Network

The paper describes an electric field measurement method based electroscope system to check the electrification state of ultra-high voltage transmission lines, which is composed of three parts: 1) Measuring terminal; 2) Central sever; 3) GPRS and Internet network. The measuring terminal was used to measure the electric field and the location of the measuring points, then the measured data was sent to the central sever by GPRS and Internet network, and requested for an electricity state confirmation.When the sever received a request from a terminal, the electric fields and locations of the measuring points were obtained first, then according to the location of the measuring points, the server searches the corresponding objective transmission lines in the database and read their parameters. According to the parameters of the measuring points and transmission lines, a calculation would be carried out to confirm the electrification state of the transmission lines. For the confirmation calculation, equations for the electric field inverse problem of the transmission lines were set up first, then global regularization and damped Gauss Newton (DGN) method were used to solve the inverse problem.A 500kV double loops transmission line was taken as an example to verify the validity of this method. The electric field and location of 11 measuring points were measured by the measuring terminal firstly, and then sent to the central sever. Electrification state was confirmed by the central sever.

The Application of the Optic Sensor in the Monitoring on the Transmission Lines

2012 ◽  
Vol 263-266 ◽  
pp. 939-942
Author(s):  
Ya Fei Hou ◽  
Rui Ke ◽  
Yi Ma ◽  
Ran Huang ◽  
Wei Deng
Keyword(s):  
Electric Field ◽  
Transmission Lines ◽  
Fiber Composite ◽  
Optic Fiber ◽  
Monitoring Methods ◽  
Operation Performance ◽  
Fiber Sensors ◽  
Insulator Surface ◽  
Detection Technology ◽  
Surface Electric Field

Three technologies of insulator online monitoring based on optic fiber sensors is described in proposed paper, including optic fiber sensor salt density technology, optical fiber composite insulator monitoring technology and optical sensor insulator surface electric field detection technology. According to measuring insulator surface ESDD, the internal stress and the temperature distribution of the composite insulators and insulator surface electric field values. these technology can monitor the operation performance of insulator. These techniques that improve the existing insulators monitoring methods has a strong innovative and practical application prospects.

scholarly journals Temperature and Electric Field Distribution Characteristics of a DC-GIL Basin-Type Spacer with 3D Modelling and Simulation

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7889
Author(s):  
Xiaolong Li ◽  
Mingde Wan ◽  
Shouyi Yan ◽  
Xin Lin
Keyword(s):  
Heat Capacity ◽  
Temperature Distribution ◽  
Electric Field ◽  
Transmission Lines ◽  
Thermal Gradient ◽  
Electric Field Distribution ◽  
Convex Surface ◽  
The Finite Element Method ◽  
Surface Electric Field ◽  
Real Type

The temperature properties of real-type direct-current gas-insulated transmission lines (DC-GIL) with a basin-type spacer were investigated by the finite element method in this paper. A horizontally installed model was established and the temperature distribution was obtained with a 3D model. The specific heat capacity and thermal conductivity of the spacer were measured and applied in the simulation. The results show that the temperature of the convex surface was slightly higher than that of the concave surface. With an increase in the SF6 pressure, the temperature of the spacer decreased, which can be attributed to the improvement of convection due to increases in the heat capacity per unit volume. With an increase in the ambient temperature, the temperature of the spacer increased linearly. The temperature difference between the inner and outer parts of the spacer increased with increases in the load current. Besides, an obvious increase in the surface electric field strength appeared under the influence of the thermal gradient compared to the results without the thermal gradient. Thus, special attention should be paid to the insulation properties of the spacer considering the influence of temperature distribution. This study evaluates both the thermal and insulation characteristics of the GIL along with the spacer under various conditions.

scholarly journals Study of Non-contact Voltage Detector of 1000kV UHV AC Based on MEMS Electric Field Sensor

2018 ◽  
Vol 160 ◽  
pp. 02001
Author(s):  
Jianjun Zhu ◽  
Xinglie Lei ◽  
Ziming Su ◽  
Ting Liu ◽  
Kai Liu ◽  
...  
Keyword(s):  
Electric Field ◽  
Transmission Lines ◽  
Microelectromechanical Systems ◽  
Contact Voltage ◽  
Electric Field Sensor ◽  
Field Sensor ◽  
Working Principle ◽  
Uhv Transmission Lines

This paper expounds the working principle of non-contact voltage detector and the electric field sensor which made by the technology of microelectromechanical systems (MEMS), determined the requirements of the detecting area and the threshold of the detector through simulation, and correct the threshold by carrying out experiments, which shows that by setting the threshold of the detector at 25kV/m, when the detector is 10-15m away from the conductors, or 2m away from the tower toward the conductor at the tower body whereas the same high as the conductor or on the crossarm, the detector can effectively identify whether the conductor is power on or off. The MEMS no-contact voltage detector and the method put forward by this paper can solve the problem of voltage detecting on UHV transmission lines, which has wide popularization and application value.

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