220 kV Pantograph Disconnector Terminals
220 kV Pantograph Disconnector Terminals
(OP)
I am currently doing a design for a 220 kV double bus single breaker SS, the design uses pantograph disconnector.
Manufacturer drawing shows that the terminal permissible loading differs greatly from horizontal and transverse horizontal directions, making life a bit hard for pipe connection with the other disconnector due to high short circuit forces.
I don't know why the equipment terminals have different values for Fa horizontal(straight)and Fb transverse horizontal (cross/lateral) loads despite the fact that both forces act horizontally (with the same cantiliver moment on the post insultors!!)

any clues?
Manufacturer drawing shows that the terminal permissible loading differs greatly from horizontal and transverse horizontal directions, making life a bit hard for pipe connection with the other disconnector due to high short circuit forces.
I don't know why the equipment terminals have different values for Fa horizontal(straight)and Fb transverse horizontal (cross/lateral) loads despite the fact that both forces act horizontally (with the same cantiliver moment on the post insultors!!)

any clues?






RE: 220 kV Pantograph Disconnector Terminals
lEC 62271-102 Standard HIGH VOLTAGE SWITCHGEAR AND CONTROLLER
PART 102 ALTERNATING CURRENT DISCONNECTORS AND EARTHING SWITCHES
Table 3- Recommended static mechanical terminal loads[ for 245 kV 2000 A rated]