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 22.6 volts drop is observed at 480 amps continuous current.

 

CLR, 800 AMPS CONTINUOUS, FAULT CURRENT 17000 AMPS, P/N 18794CLR Schematic Diagram

 

The Calculations of inductance value for 480 amps continuous and 17000 amps fault current are shown below:

Assuming 17000 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 17000) = 74.9 uH

Voltage Drop Across The CLR At 800 Amps Continuous Is

  • V = 2 x pi x F x L x I (Continuous Current)
  • V = 2 x 3.142 x 60 x (74.9 x 10-6) x 800
  • V = 22.6 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
22.6 Volts 800 Amps
28.3 Volts 1000 Amps
113.2 Volts 4000 Amps
226.4 Volts 8000 Amps
283 Volts 10000 Amps
229.6 Volts 12000 Amps
424.5 Volts 15000 Amps
480 Volts 17000 Amps

 

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

 

CLR, 800 AMPS CONTINUOUS, FAULT CURRENT 17000 AMPS, P/N 18794CLR

 

Specifications:

  • Gapped Inductor, P/N 19016L
  • L (1, 2) = 74.9 uH ± 25 %, 800 Amps
  • Copper winding construction
  • Three inductor in one enclosure
  • Temperature rise: 23°C
  • Copper bus bar: 3” x ⅜” with 2 holes.
  • Indoor enclosure: 36”H x 28”W x 18”D

Three inductors are housed inside one enclosure. The photo of the enclosure is shown below:

 

CLR, 800 AMPS CONTINUOUS, FAULT CURRENT 17000 AMPS, P/N 18794CLR

 

All our current limiting reactors 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 info@LCMAGNETICS.COM.