INDUSTRIAL SF6 CIRCUIT BREAKERS OF TYPE VSD FOR 245 KV AND 420 KV. EMPLOYS PUFFER INTERRUPTER WITH COMPACT HYDRO SPRING OPERATING MECHANISM CONFIRMING TO CLASS M2 & C2. THE CONSTRUCTION OF TYPE VSD BREAKERS ARE SIMILAR TO DEAD TANK CIRCUIT BREAKER CONCEPT AND PROVIDE VARIOUS ADVANTAGES AS FOLLOWS :
* BETTER SEISMIC WITHSTAND CHARACTERISTICS DUE TO ITS LOWER CENTER OF GRAVITY.
* IMPROVED SYSTEM RELIABILITY DUE TO SMALLER LENGTH AND WEIGHT OF MOVING MASES, THUS REDUCTION OF ENERGY REQUIREMENT FOR OPERATION.
* ELIMINATION OF FREE STANDING CONVENTIONAL CURRENT TRANSFORMERS BY IN BUILT RING CORE CT'S AND THUS ELIMINATION OF DI-ELECTRIC FAILURES AND ITS DISASTROUS CONSEQUENCES.
* TYPE VSD CIRCUIT BREAKERS WITH IN-BUILT CT UNITS, PROVIDES DIRECT SPACE REDUCTION BY MINIMUM 40% AS COMPARED LIVE TANK CIRCUIT BREAKER WITH SEPARATE CURRENT TRANSFORMER UNIT.
* TYPE VSD CIRCUIT BREAKERS, EQUIPPED WITH MODERN HOLLOW COMPOSITE INSULATOR (SILICON RUBBER INSULATION) PROVIDES ADDITIONAL BENEFITS LIKE LIGHTER IN WEIGHT, SHUTTER PROOF, HYDRO-PHOBICITY AND RESISTANCE TO WEATHERING, AGEING EFFECTS.