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220 kV Pantograph Disconnector Terminals

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?

RE: 220 kV Pantograph Disconnector Terminals

In my opinion, it is according to:
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]

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