Contact system for electrical current conduction and bus transfer switching in a switchgear

A contact system for a switchgear, comprising:

• a fixed contact assembly including a fixed main contact and a fixed arcing contact for bus transfer switching, wherein the fixed arcing contact comprises a finger including a contacting element for engaging with a corresponding contacting element of a movable arcing contact of a movable contact assembly of the contact system during the bus transfer switching;
• and
• the movable contact assembly comprising a current path pipe and an end piece, wherein the current path pipe comprises a cylindrical pipe and the end piece comprises a rectangular block attached at an end of the cylindrical pipe, wherein the movable contact assembly comprises a movable main contact and the movable arcing contact, wherein the movable main contact is for engaging with the fixed main contact for current conduction, and the movable arcing contact is for the bus transfer switching, wherein the movable main contact is provided on the rectangular block, and the movable arcing contact is provided at the end of the cylindrical pipe on a portion about a periphery of the cylindrical pipe,
• wherein during engagement of the movable contact assembly with the fixed contact assembly, the cylindrical pipe turns about a first axis to bring the movable contact assembly proximal to the fixed contact assembly, and then twists about a second axis for engagement of the movable main contact with the fixed main contact, wherein during the engagement of the movable contact assembly and fixed contact assembly, the fixed arcing contact and the movable arcing contact for bus transfer switching are contacts that are first to engage and are disengaged when the movable main contact and the fixed main contact are engaged.

A switchgear having a turn and twist mechanism for electrical connection and disconnection, the switchgear comprising a contact system for electrical current conduction and bus transfer switching, the contact system comprising:

• a fixed contact assembly including a fixed main contact and a fixed arcing contact for the bus transfer switching, wherein the fixed arcing contact comprises a finger including a contacting element for engaging with a corresponding contacting element of a movable arcing contact of the contact system during the bus transfer switching;
• and
• a movable contact assembly comprising a current path pipe and an end piece, wherein the current path pipe comprises a cylindrical pipe and the end piece comprises a rectangular block attached at an end of the cylindrical pipe, wherein the movable contact assembly comprises a movable main contact and the movable arcing contact, wherein the movable main contact is for engaging with the fixed main contact for current conduction, and the movable arcing contact is for the bus transfer switching, wherein the movable main contact is provided on the rectangular block, and the movable arcing contact is provided at the end of the cylindrical pipe on a portion about a periphery of the cylindrical pipe;
• wherein during engagement of the movable contact assembly with the fixed contact assembly, the cylindrical pipe turns about a first axis to bring the movable contact assembly proximal to the fixed contact assembly, and then twists about a second axis for engagement of the movable main contact with the fixed main contact, wherein during the engagement of the movable contact assembly and the fixed contact assembly, the fixed arcing contact and the movable arcing contact for the bus transfer switching are contacts that are first to engage and are disengaged when the movable main contact and the fixed main contact are engaged;
• and
• wherein the fixed contact assembly further comprises a mechanical stopper for stopping a turning movement of the current path pipe.