Vacuum Circuit Breaker and Heat Transfer Assembly Therefor

A vacuum circuit breaker, comprising:

• a dead tank defining a chamber and storing an insulated gas;
• and
• an interrupter unit arranged inside the chamber and comprises:
• a vacuum sealed bottle having a first end and a second end;
• a first conductor casing attached to the first end of the vacuum sealed bottle and extending outwardly and along a central axis of the vacuum sealed bottle;
• a second conductor casing attached to the second end of the vacuum sealed bottle and extending outwardly and along the central axis of the vacuum sealed bottle;
• a moving contact arranged to move along the central axis of the vacuum sealed bottle and arranged partially inside the vacuum sealed bottle and partially inside the first conductor casing;
• a stationary contact non-movably and partially arranged inside the vacuum sealed bottle and connected to the second conductor casing, wherein the moving contact is displaced to engage and disengage with the stationary contact to close and open an electric circuit;
• at least one plate including a plurality of fins secured to at least one of the first conductor casing and the second conductor casing and arranged outside the at least one of the first conductor casing and the second conductor casing;
• and
• at least one shield arranged outwardly and surrounding the at least one plate to contain electric field within a space defined between the at least one shield and the at least one plate, wherein the at least one shield includes a plurality of openings to allow a flow of the insulation gas between the space and exterior of the shield to enable a heat transfer from the fins.

An interrupter unit for a vacuum circuit breaker, the vacuum circuit breaker includes a dead tank defining a chamber to store an insulated gas, wherein the interrupter unit is adapted to be arranged inside the chamber, the interrupter unit comprising:

• a vacuum sealed bottle having a first end and a second end;
• a first conductor casing attached to the first end of the vacuum sealed bottle and extending outwardly and along a central axis of the vacuum sealed bottle;
• a second conductor casing attached to the second end of the vacuum sealed bottle and extending outwardly and along the central axis of the vacuum sealed bottle;
• a moving contact arranged to move along the central axis of the vacuum sealed bottle and arranged partially inside the vacuum sealed bottle and partially inside the first conductor casing;
• a stationary contact non-movably and partially arranged inside the vacuum sealed bottle and connected to the second conductor casing, wherein the moving contact is displaced to engage and disengage with the stationary contact to close and open an electric circuit;
• at least one plate including a plurality of fins secured to at least one of the first conductor casing and the second conductor casing and arranged outside the at least one of the first conductor casing and the second conductor casing;
• and
• at least one shield arranged outwardly and surrounding the at least one plate to contain electric field within a space defined between the at least one shield and the at least one plate, wherein the at least one shield includes a plurality of openings to allow a flow of the insulation gas between the space and exterior of the shield to enable a heat transfer from the fins.