DOUBLE BREAK DISCONNECTORS

BASE ASSEMBLY:
The base frame is made out of a fabricated steel structure designed to withstand all the external forces like wind load, dead weight of Insulator & contacts, short circuit force and seismic force etc. The centre rotating post is supported by two nos. ball bearing one at top & one at bottom of the bearing housing with adequate distance between them to avoid wobbling of Insulator.

CONTACTS:
The Main Contact consists of two fixed contacts mounted on support insulators on both ends and one moving blade mounted on the rotating insulator at the centre. The Fixed contacts are made of Hard-Drawn Electrolytic Copper, duly silver plated and are of reverse loop design supported by stainless steel springs.
The Main Blades is equipped with turn and twist mechanism with self-wiping action and pressure reliving spring-loaded contacts, which results in low contact resistance and ensures proper current transfer in all conditions.
That ensures reliable contact pressure, smooth closing & opening of the switch, and self wiping action making the Disconnector reliable in severe climatic and pollution zones.
The 420kV Disconnectors are equipped with the “DEAD Centre Mechanism”, that ensures the locking of disconnector in both close and open position in case of extreme external forces such as wind force, short circuit force, seismic force etc.

Key features –
• Reliable and Robust Design
• Low Contact resistance due to multi-point contact.
• Turn & Twist and Dead Centre Mechanism increases.
• Capability of Ice-Break Operation.

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