Скачать или смотреть MEN AT WORK ON HVDC LINE | (PART- II) - Replacement Of Insulator String Of HVDC Transmission Line

MEN AT WORK ON HVDC LINE | (PART- II) - Replacement Of Insulator String Of HVDC Transmission Line

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About the Video:
This video shows the Replacement of the Insulator String (Part -II) of the HVDC Power Transmission Line. Overhead line insulators are used to separate line conductors from each other and the supporting structures electrically. Permittivity and dielectric strength of the insulating material are very high so that it can withstand high electrical stress. Insulators protect the transmission line from overvoltages which occur due to lightning, switching, or other causes under the severe condition. There are three main types of insulation used for the overhead line.
1. Pin type insulator
2. Suspension type insulator
3. Strain or tension-type insulator

HVDC Tower
HVDC lines use a wide variety of both lattice and steel pole tower designs. The simplest T tower configurations may use
either I or V insulator systems. Inverted U tower configurations allow
closer pole-to-pole spacing while a variety of free-standing support systems are used; either for bipole systems or (singly) for monopolar systems. Constrained suspension configurations such as V string can reduce both tower height and blow-out related ROW width. Configurations that interpose no metallic structure between poles eliminate structure width as a component of minimum ROW requirement. The factors to be considered in assessing the contribution of the tower itself to ROW width requirements assuming (a) the insulator configuration itself is adequate for both steady-state operation under representative pollution conditions and overvoltages to ground and (b) pole spacing does not result in excessive conductor surface gradient.

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