Current Limiting Reactor 101 uH, 57 Amps Continuous
P/N 18786CLR
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, 400 Hz. Circuit breakers are supplied by the customer. A 14.5 volts drop is observed at 480 amps continuous current.
The Calculations of inductance value for 480 amps continuous and 1900 amps fault current are shown below:
Assuming 1900 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 400 x 1900) = 101 uH
Voltage Drop Across The CLR At 57 Amps Continuous Is
- V = 2 x pi x F x L x I (Continuous Current)
- V = 2 x 3.142 x 400 x (101 x 10-6) x 57
- V = 14.5 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 |
| 14.5 Volts | 57 Amps |
| 25.4 Volts | 100 Amps |
| 50.8 Volts | 200 Amps |
| 127 Volts | 500 Amps |
| 230.2 Volts | 800 Amps |
| 254 Volts | 1000 Amps |
| 381 Volts | 1500 Amps |
| 480 Volts | 1900 Amps |
A photo of the inductor is shown below. Three inductors are required per system. Each inductor will be housed inside a separate enclosure:
Specifications:
- Gapped Inductor, P/N 18786L
- L (1, 2) = 101 uH ± 25 %, 57 Amps
- Copper winding construction
- Copper bus bar: 1/8” x 5/8” with one hole
- RDC = 0.00155 ohms
- Calculated core loss: 27.5 watts
- Calculated copper loss: 5 watts
- Temperature rise: 35°C
- Indoor enclosure, 20”H x 16”W x 9”D
The CLR consists of three inductors. Each inductor is housed inside a separate indoor enclosure. The photo of the enclosure is shown below:
All our gapped inductors 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.