Insulation Coordination of UHVAC Transmission Lines

2017 ◽  
pp. 485-545
Author(s):  
Hao Zhou ◽  
Fei Su ◽  
Jingzhe Yu
Keyword(s):  
Transmission Lines ◽  
Insulation Coordination

Discussion of "Insulation coordination for gas-insulated transmission lines (GIL)" and closure

2001 ◽  
Vol 16 (4) ◽  
pp. 822-824 ◽  
Author(s):  
A. Sabot ◽  
O. Volcker ◽  
H. Koch
Keyword(s):  
Transmission Lines ◽  
Insulation Coordination

scholarly journals Assessment of Overvoltage and Insulation Coordination in Mixed HVDC Transmission Lines Exposed to Lightning Strikes

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4217
Author(s):  
Mansoor Asif ◽  
Ho-Yun Lee ◽  
Kyu-Hoon Park ◽  
Ayesha Shakeel ◽  
Bang-Wook Lee
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Protective Level ◽  
Lightning Strikes ◽  
Hvdc Transmission ◽  
Surge Arresters ◽  
Hvdc Transmission Lines ◽  
Lightning Impulse ◽  
Insulation Coordination ◽  
Front Model

Many geographical constraints and aesthetic concerns necessitate the partial use of cable sections in the High Voltage DC (HVDC) transmission line, resulting in a mixed transmission line. The overhead sections of mixed lines are exposed to lightning strikes. The lightning strikes can not only result in flashover of overhead line (OHL) insulators but can enter the cable and permanently damage its insulation if adequate insulation coordination measures are not taken. In this work, we have analyzed the factors that affect the level of overvoltage inside the cable by simulating a fast front model in PSCAD. It has been determined that surge arresters must be provided at cable terminals when the length of cable sections is less than 16 km to limit the core-ground overvoltage within the lightning impulse protective level (LIPL). The level of sheath-ground overvoltage is independent of the length of cable; however, it can be limited within LIPL by lowering the sheath grounding impedance to 1.2 Ω. Insulation coordination measures do not impact the likelihood of OHL insulators’ flashover. The flashover performance of OHL can be improved by lowering the footing impedance of the second tower closest to the cable terminals, which is otherwise most likely to flashover.

Sign in / Sign up

Export Citation Format

Share Document