CENTRE-BREAK DISCONNECTORS TYPE SGF
Rated voltage: 36 - 550 kV
Rated normal current: 1600 - 4000 A
Rated short-time withstand current: 40 kA - 63 kA
Disconnectors type SGF are used for metallic isolation of systems by creating in open position a visible isolating distance.
They are appropriate for switching small currents or currents when no significant change in voltage occurs across the terminals. Two-column rotary disconnectors can be operated in many types of high voltage switchgear that are in use.
For earthing and short-circuiting disconnected plant sections, each disconnector pole can be equipped with one or two earthing switches.
Optionally each disconnector can be equipped with one or two earthing switches.
The SGF disconnectors comply with publication IEC 62271-102; IEC 62271-1 and most other national regulations.
Features:
1. WELDED ALUMINIUM STRUCTURE
The current path halves are welded aluminium structures with a minimum number of terminal points that are subject to corrosion; thanks to that no appreciable change of the contact resistance over many years.
2. NO EXTERNAL SPRINGS
Contact fingers without external springs.
3. STRONG ROTARY PEDESTALS
They guarantee that the deflection remains unchanged at high static mechanical terminal loads.
4. ICE BREAKING CAPABILITY
Disconnectors for operations under severe ice conditions up to 20 mm ice thickness are available.
5. DEAD CENTRE INTERLOCKING
For all operating mechanisms. It ensures no change of the switching position in case of extreme external influences such as storm, vibration and earthquake.
6. LITTLE MAINTENANCE
Owing to the selection of the material used and the encapsulation of the pedestals and rotary heads in connection with a permanent lubrication, the units are practically maintenance-free.