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RC SNUBBER FILTERS


 

RC Snubber Filters are used to control an inductive load. They consist of a capacitor and resistor which are serially connected across a switch.

 

Used for reactive power compensation and voltage regulation purposes, shunt reactors work with electric utility at different voltage levels. During the turn-off action of the breaker or contactor, considerably large over-voltages can occur due to the sudden interruption of an inductive current. In order to prevent damage to system equipment, high frequency transient over-voltage surge suppressors, also called RC snubber filters are used. Most often, they are used in conjunction with shunt reactors or other inductive loads to provide protection for motors, transformers and generators from things such as: steep wave-front, short time rise, high magnitude, spikes, surges transient over-voltages and circuit switching. RC Snubber Filters are able to clamp the voltage overshoot due to current interruption and safely damp out the oscillations.

 

 

Advantages

 

  • Longer insulation lifetime for machinery
  • Protects against insulation failures between windings
  • Protects against arcs between the contacts of vacuum circuit breakers and other switchgear caused by high frequency over-voltage
  • Protects against high frequency over-voltage specifically caused by arc furnaces
  • Eliminates downtime due to insulation failures
  • Eliminates multiple pre and re-strike transients of vacuum and other switching devices
  • Three and single phase

 

 

Application Areas

 

  • Large motors
  • Fans
  • Induction and arc furnaces
  • Crushers
  • Motor-Generator sets
  • Conveyors
  • Generators
  • Shunt reactors
  • Mine winders
  • Mills
  • Refrigeration
  • Substations
  • Auxiliary Supplies
  • Pumps
  • Dry type transformers

* Hilkar provides engineering services to assign R and C values as per system parameters.

Without RC filter during switching

Without RC filter during switching


With RC filter during switching

With RC filter during switching


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