CENTRE-BREAK DISCONNECTORS TYPE SSBII
Rated voltage: 420 - 550 kV
Rated normal current: 1600 - 4000 A
Rated short-time withstand current: 40 kA - 80 kA
Disconnectors type SSBII 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.
The main blade consists of a U-shaped profile, in which the main contacts and the rotating contacts are installed.
The rotating contacts consists of a silver-plated copper pin and a bronze housing. Silver-plated bronze balls, which are pressed against these two parts by means of a stainless steel spring, ensure that the current is transferred from the pin into the housing. This contact construction is sealed and maintenance free.
The main contacts are installed inside the main blade. They are made of copper, with a silver plated surface.
Each contact finger is provided with stainless steel springs to ensure reliable contact pressure.
The contacts are self-cleansing, which makes the disconnector suitable for installation in areas with severe climatic conditions. Depending on the voltage rating, anti-corona shields will be provided.
The SSBII disconnectors comply with publication IEC 62271-102; IEC 62271-1 and most other national regulations.