Research of Safety Protection for Live Working on 1000kV AC Ultra High Voltage Transmission Line

Liu, Kai; Wang, Linong; Hu, Yi; Shao, Guangjie; Liu, Ting; Xiao, Bin

doi:10.1109/appeec.2010.5449438

Cited by 1 publication

(14 citation statements)

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“…Section 3 presents the modeling and simulation results of equipotential level. Our previous work on 1000‐kV single circuit transmission line and the simulations performed in this paper on the double circuit transmission line showed that electric field calculation by finite element method (FEM) matches very well with the actual measurements. Therefore, for safety reasons and rigorous data acquisition, we use FEM to calculate the electric field on the worker's body during the process of entering equipotential.…”

Section: Introductionsupporting

confidence: 63%

“…The 60-dB conductive clothing and the 20-dB metallic mask have been recommended for live working on 1000-kV transmission lines [17]. We choose the same as a reference to evaluate their efficacy for live working in the 1000-kV substation.…”

Section: Measurement Results and Analysismentioning

confidence: 99%

“…These values of electric field are well below the limits set by GB/T 6568–2008. Our previous work on live working on 1000‐kV transmission line found the electric field to be 42–265 kV/m outside conductive clothing and 0.4–0.8 kV/m inside conductive clothing at ground potential. When the worker stands right below the conductors at location 1, the electric field at the worker's head and chest in the 1000‐kV substation is 114 and 75 kV/m, respectively, which is slightly different from those of the transmission line (106.4 kV/m at the top of the head and 74.2 kV/m at chest) .…”

Section: Electric Field Measurements At Ground Potentialmentioning

confidence: 97%

“…Our previous work on live working on 1000‐kV transmission line found the electric field to be 42–265 kV/m outside conductive clothing and 0.4–0.8 kV/m inside conductive clothing at ground potential. When the worker stands right below the conductors at location 1, the electric field at the worker's head and chest in the 1000‐kV substation is 114 and 75 kV/m, respectively, which is slightly different from those of the transmission line (106.4 kV/m at the top of the head and 74.2 kV/m at chest) . For other locations, there is a small difference between the electric field range of the worker in the 1000‐kV substation and the transmission lines due to the different tower structures of the substation and the transmission lines.…”

Section: Electric Field Measurements At Ground Potentialmentioning

confidence: 97%

“…Electric field strengths on various parts of the worker's body are measured to determine the electric field level while working at ground potential. Based on our earlier live working experience on 1000-kV transmission lines [17][18][19], seven typical locations, shown in Fig. 4, were selected for the ground potential measurements.…”

Section: Measurement Schemementioning

confidence: 99%

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1000‐kV UHV substation live working and safety recommendations

Fang

Rehman

Xiao³

et al. 2018

IEEJ Transactions Elec Engng

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This work focuses on the measurement and analysis of the electric field for live working in a 1000‐kV substation. Also, it compares the electric field and the shielding efficiency requirement of a 1000‐kV substation with 1000‐kV transmission lines. The electric field at the ground potential of the substation was measured using a microelectromechanical system (MEMS)‐based device. However, for safety reasons and to acquire rigorous data, finite element method (FEM) was applied to calculate the electric field at equipotential. Two cases of entry into equipotential were considered: one in which the worker moves along tension insulators to live conductors, and another where the worker is lifted to an energized bus bar on an insulated elevating platform. Our results indicate that the electric field values on the worker in the 1000‐kV substation and transmission lines are about the same at ground potential, while at equipotential, the substation's maximum electric field is 25.2% higher outside the conductive clothing and 47.4% higher outside the metallic mask as compared to the 1000‐kV transmission lines. Based on these results, for live working in a 1000‐kV substation, we recommend the use of conductive clothing with 60‐dB shielding efficiency, which is similar to that used in live working on a 1000‐kV transmission line, but the metallic mask should have 25‐dB shielding efficiency, which is 5 dB higher than that used for the transmission line. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: Introductionsupporting

confidence: 63%

Section: Measurement Results and Analysismentioning

confidence: 99%

Section: Electric Field Measurements At Ground Potentialmentioning

confidence: 97%

Section: Electric Field Measurements At Ground Potentialmentioning

confidence: 97%

Section: Measurement Schemementioning

confidence: 99%

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