Current Limiting Reactor, 3400 Continuous Amps, 18000 VAC L-L,

150000 Available Amps 60000 Fault Limit Amps, P/N KK-21

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:

A. CLR, 3400 Amps continuous, 150000 available Amps, 60000 Amps desired fault current, P/N KK-21
B. Copper windings
C. Approvals: none
D. System shipping weight: 6000 lbs. (three enclosures)
E. Calculated Inductance Value: 421 uH, 3400 Amps continuous
F. Three inductors in three indoor enclosures (68″H x 65″W x 44″D)

 

The detail of one Air Core Inductor, KK-21-1 is shown below. Three KK-21-1 are required for one CLR KK-21.

 

 KK-21-1. Three are required per system

 

Specifications:

  • Air Core Inductor, P/N KK-21-1
  • L (1, 2) = 421 uH
  • Continuous Current: 3400 Amps
  • Frequency: 60 Hz
  • Copper windings
  • Approvals: None
  • Copper bus bars are 6″ x 3/8″ thick with two holes
  • One CLR consists of three separate air core inductors in three separate indoor enclosures

Each P/N KK-21-1 is housed inside an indoor enclosure as shown below. Three each of KK-21-1 make one CLR system KK-21

 


 

The photo of the indoor enclosure is shown below:

 

 

Three Inductors in three separate enclosures

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.