Current Limiting Reactor 37.4 uH, 480 Amps Continuous
P/N 18885CLR

The customer application is shown below. The CLR (current limiting reactor) consists of three gapped inductors inside one enclosure. The input power is 480 VAC, 3 PH, 60 Hz. Circuit breakers are supplied by the customer. A 6.7 volts drop is observed at 480 amps continuous current.

 

CLR, 480 AMPS CONTINUOUS, FAULT CURRENT 34000 AMPS , P/N 18885CLR Schematic Diagram

 

The Calculations of inductance value for 480 amps continuous and 34000 amps fault current are shown below:

Assuming 34000 Amps Fault Current, The Inductance Value is

  • V = 2 x pi x F x L x I (Fault Current)
  • L = 480 / (2 x pi x F x I (Fault Current))
  • L= 480 / (2 x 3.142 x 60 x 34000) = 37.4 uH

Voltage Drop Across The CLR At 480 Amps Continuous Is

  • V = 2 x pi x F x L x I (Continuous Current)
  • V = 2 x 3.142 x 60 x (37.4 x 10-6) x 480
  • V = 6.7 Volts

The voltage drop across the CLR at different current levels is shown in Table A:

 

Table A

Voltage Drop Across The CLR Current Thru The CLR
6.7 Volts 480 Amps
14 Volts 1000 Amps
28 Volts 2000 Amps
70 Volts 5000 Amps
140 Volts 10000 Amps
280 Volts 20000 Amps
420 Volts 30000 Amps
480 Volts 34000 Amps

 

A photo of the inductor is shown below. Three inductors are required per system:

 

CLR, 480 AMPS CONTINUOUS, FAULT CURRENT 34000 AMPS , P/N 18885CLR

 

Specifications:

  • Gapped Inductor, P/N 18885L
  • L (1, 2) = 37.4 uH ± 25 %, 480 Amps
  • Copper bus bar: 2” x 1/4” thick with one hole
  • Copper winding construction
  • Enclosure dimensions: 24”H x 20”W x 9”D
  • Four louvers are installed on the enclosure for free airflow

The photo of the CLR is shown below:

 

CLR, 480 AMPS CONTINUOUS, FAULT CURRENT 34000 AMPS , P/N 18885CLR

 

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