Abstract: The invention relates to a center break switch having a contact system for electrical current conduction and bus transfer switching. The contact system includes two moving contacts. One of the two moving contacts includes a finger contact and the other moving contact includes a first contact. Each moving contact includes a contact for bus transfer switching, wherein one of the two contacts includes a spherical contacting element, and the other contact includes a rectangular contacting element. The spherical contacting element and the rectangular contacting element engage during switching for the bus transfer, and stay in contact when the finger contact is engaged with the first contact for electrical current conduction.

Abstract: An oil filled electrical equipment includes an assembly for oil filling and hermetically sealing the electrical equipment. The assembly includes a cylindrical bellow mounted on a plate of the electrical equipment with one or more fittings. The bellow provides pressure and volume compensation in the electrical equipment. The bellow includes a cylinder with a plurality of convolutions for expanding and contracting to provide the compensation. The bellow further includes two covers attached with the cylinder at two ends of the cylinder. Each cover includes a cylindrical part that is open at a first end and closed at a second end. The first end terminates at a circular face for mounting the cover on a convolution at a corresponding end of the cylinder. The second end includes an opening for oil filling and hermetically sealing the electrical equipment, and mounting the bellow on the plate.

Abstract: The invention relates to a center break switch having a contact system for electrical current conduction and bus transfer switching. The contact system includes two moving contacts. One of the two moving contacts includes a finger contact and the other moving contact includes a first contact. Each moving contact includes a contact for bus transfer switching, wherein one of the two contacts includes a spherical contacting element, and the other contact includes a rectangular contacting element. The spherical contacting element and the rectangular contacting element engage during switching for the bus transfer, and stay in contact when the finger contact is engaged with the first contact for electrical current conduction.

Abstract: An oil filled electrical equipment includes an assembly for oil filling and hermetically sealing the electrical equipment. The assembly includes a cylindrical bellow mounted on a plate of the electrical equipment with one or more fittings. The bellow provides pressure and volume compensation in the electrical equipment. The bellow includes a cylinder with a plurality of convolutions for expanding and contracting to provide the compensation. The bellow further includes two covers attached with the cylinder at two ends of the cylinder. Each cover includes a cylindrical part that is open at a first end and closed at a second end. The first end terminates at a circular face for mounting the cover on a convolution at a corresponding end of the cylinder. The second end includes an opening for oil filling and hermetically sealing the electrical equipment, and mounting the bellow on the plate.