KONČAR - Medium Voltage Apparatus Inc. last update 10.01.2010.
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Ru Series

MEDIUM VOLTAGE DISCONNECTORS

for indoor installation

Disconnectors are mechanical switching devices, that for a safety reasons form isolating distance in opened position according to fixed requirements. They fulfill the demand for a visible isolating distance with a certain isolation capacity. Under normal service conditions, disconnectors are capable of carrying normal currents as well as short circuit currents in determined short time. Disconnectors are also capable of breaking negligible currents, e.g. short unloaded cables or voltage transformers, as well as currents where no significant potencial change at contacts occur, e.g. short circuit of closed circuit breaker contacts.

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.


BASIC CHARACTERISTICS



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.

Cell width:
  • 700 mm at 12 kV
  • 1000 mm at 24 kV

BASIC TECHNICAL SPECIFICATIONS



Rated voltagekV1238
Rated currentA6302500
Permissible short-circuit current (ampl.)kA40125
Permissible short time withstand current, 1 s (eff.)kA1650
Power frequency withstand voltage to earth (50Hz/1 min.)kV2870
Power frequency withstand voltage across insulating dist. (50Hz/1 min.)kV3280
Peak withstand voltage to earth (1,2/50 μs)kV75170
Peak withstand voltage across insulating dist. (1,2/50 μs)kV85195



 
2005-10-21


 
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