Medium voltage disconnectors series Ru for indoor installation have been designed, manufactured and tested in accordance with IEC 62271-102. Standard versions of disconnectors series through are manufactured as three-pole and single-pole units. They can be operated by means of manual operating mechanism.
Standard versions of disconnectors series through are manufactured as three-pole units. They can be operated by means of manual operating mechanism or electric motor drive type EMP 20. Special versions of disconnectors for larger rated currents or less than three poles can be quoted and manufactured on customer's request.
Standard three-pole disconeector is a compact unit, which consists of steel base frame with three poles. The poles are mechanically interconnected and move symultanneously. Each pole has two epoxy resin post insulators which support fixed contacts and carry main blades (moving contacts). The disconnectors can be equipped with earthing blades either at opening or rotating side of the main blades. Main blades are interlocked with earthing blades by means of reliable interlock which prevents them to be in closed position at the same time.
- 700 mm at 12 kV
- 1000 mm at 24 kV
BASIC TECHNICAL SPECIFICATIONS
|Permissible short-circuit current (ampl.)||kA||40||125|
|Permissible short time withstand current, 1 s (eff.)||kA||16||50|
|Power frequency withstand voltage to earth (50Hz/1 min.)||kV||28||70|
|Power frequency withstand voltage across insulating dist. (50Hz/1 min.)||kV||32||80|
|Peak withstand voltage to earth (1,2/50 μs)||kV||75||170|
|Peak withstand voltage across insulating dist. (1,2/50 μs)||kV||85||195|