Current Limiting Reactor, 800 Continuous Amps, 480 VAC L-L,

35000 Available Amps 18000 Fault Limit Amps, P/N KK-20

A current-limiting reactor is used when the prospective short-circuit current in a distribution or transmission system is calculated to exceed the interrupting rating of the associated switchgear. The inductive reactance is chosen to be low enough for an acceptable voltage drop during normal operation, but high enough to restrict a short circuit to the rating of the switchgear. The amount of protection that a current-limiting reactor offers depends upon the percentage increase in impedance that it provides for the system.
 
The main motive for using current-limiting reactors is to reduce short-circuit currents so that circuit breakers with lower short-circuit breaking capacity can be used. They can also be used to protect other system components from high current levels and to limit the inrush current when starting a large motor.

The customer application is shown below:

Current Limiting Reactor, Three Phase

Inductance Calculation

Specifications:

  • CLR, 800 Amps continuous, 35000 available Amps, 18000 Amps desired fault current, P/N KK-20
  • Copper windings
  • Approvals: none
  • System shipping weight: 600 lbs. (one enclosure)
  • Calculated Inductance Value: 35 uH, 800 Amps continuous
  • Three inductors in one NEMA 3R enclosure (68″H x 65″W x 52″D)

 

The detail of one Air Core Inductor, KK-20-1 is shown below. Three KK-20-1 are required for one CLR KK-20.

 

 KK-20-1. Three are required per system

 

Specifications:

  • Air Core Inductor, P/N KK-20-1
  • L (1, 2) = 26.5 uH
  • Continuous Current: 800 Amps
  • Frequency: 60 Hz
  • Copper windings
  • Approvals: None
  • Copper bus bars are 3″ x 1/4″ thick with two holes
  • One CLR consists of three separate air core inductors in one NEMA 3R enclosure

Three KK-20-1 are housed inside a NEMA 3R enclosure as shown below: Three each of KK-20-1 make one CLR system KK-20

 

 

The photo of the NEMA 3R enclosure is shown below:

 Three Inductors in one enclosure

All our CLR’s are custom-built to order. To discuss your specific application, please call our phone number at (714) 624-4740, or send us an email at quote@lcmagnetics.com.