Current Limiting Reactor, 600 Continuous Amps, 13800 VAC L-L,

38000 Available Amps, 25000 Fault Limit Amps, P/N KK-23

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

The inductance calculations are shown below:

  • L-L = 13800 VAC
  • V L-N = 7967 VAC
  • Available Fault Current = 38000 Amps
  • Designed Fault Current = 25000 Amps
  • Z system (based on Available Current) = 7967 / 38000 = 0.2097 Ohms
  • Z system (based on Designed Fault Current) = 7967 / 25000 = 0.3187 Ohms
  • Z needed = Square Root of (0.3187² – 0.2097²) = 0.2400 Ohms
  • Inductance = 0.2400 / (2 x 3.142 x 60) = 637 uH
  • Reactance Voltage Drop = 0.2400 Ohms x 600 Amps = 144 VAC
  • Percentage Voltage drop = 144 / 13800 = 1.04 %

Specifications:

A. CLR, 600 Amps continuous, 38000 available Amps, 25000 Amps desired fault current, P/N KK-23
B. Copper windings
C. Approvals: none
D. System shipping weight: 1500 lbs. (three enclosures)
E. Calculated Inductance Value: 637 uH, 600 Amps continuous
F. Three inductors in three separate enclosures (60″H x 60″W x 60″D)

 

The detail of one Air Core Inductor, KK-23-1 is shown below. Three KK-23-1 are required for one CLR KK-23.

 

 

 KK-23-1. Three are required per system

 

Specifications:

  • Air Core Inductor, P/N KK-23-1
  • L (1, 2) = 637 uH
  • Continuous Current: 600 Amps
  • Frequency: 60 Hz
  • Copper windings
  • Approvals: None
  • Copper bus bars are 2″ x 1/4″ thick with one hole
  • One CLR consists of three separate air core inductors in three enclosures

Each P/N KK-23-1 is housed inside an indoor enclosure as shown below.

 

 

The System consists of three inductors in three separate enclosures. Indoor Enclosure Dimensions are 60″H x 60″W x 60″D

 

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.