GN19-12 (C) Series Indoor High-Voltage Disconnector
Scope of use
GN19-12 (C) series outdoor high-voltage disconnectors are used in the power system with the rated voltage of 12KV AC 50Hz and below. They are equipped with CS6-1 type human operation mechanism, which can be used to open and close circuits with voltage but no load. They also have derivative products, such as antifouling type, plateau type, and can be equipped with live display devices.
Conductive part
The fixed contact is composed of a copper plate bent into a right angle, and the perforated end of the fixed contact can be connected with the bus through a screw; The other end is short, and it contacts the moving blade (moving contact) when closing.
Two copper plates form a contact strip, also known as a moving contact, which can rotate around the shaft for a certain angle. When closing, it holds the static contact. There is a clamping spring between the two copper plates to adjust the contact pressure between the dynamic and static contacts. At the same time, when the two copper plates flow the current in the same direction, they generate mutually attractive electromotive force, which increases the contact pressure and improves the operation reliability. Galvanized steel sheet, called magnetic lock, is installed at both ends of the contact bar, which ensures the mutual attraction force generated by magnetic lock magnetization when passing the short-circuit fault current, strengthens the contact pressure of the contact, thus improving the dynamic and thermal stability of the disconnector.
Insulating part
The dynamic and static contacts are respectively fixed on two sets of supporting porcelain bottles. For the model with C, the moving contact is fixed on the bushing insulator. In order to insulate the moving contact from the metal and grounding transmission parts, porcelain insulated rod insulators are used.
Transmission part
There are spindle, crank arm, pull rod insulator, etc.
Base part
It is composed of steel frame. The supporting porcelain bottle or bushing porcelain bottle and the driving spindle are fixed on the base. The base shall be grounded. In a word, the disconnector is simple in structure, without arc extinguishing device, and has obvious breaking point when it is in the off position. Its on-off state is very intuitive.
