RFM water-cooled capacitors are the compensation capacitors for medium-frequency induction furnaces. They correct power factor and form the resonant tank with the induction coil.
Technical Data
| Model | UN (kV) | QN (kvar) | FN (kHz) | CN (µF) | IN (A) | Groups | L (mm) | B (mm) | H (mm) | I (mm) | II (mm) | b (mm) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RFM0.75-500-2.5S | 0.75 | 500 | 2.5 | 56.59 | 666.7 | 4 | 303 | 120 | 250 | 105 | 87 | 55 | 14.0 |
| RFM0.75-500-10S | 0.75 | 500 | 10.0 | 14.15 | 666.7 | 4 | 303 | 120 | 195 | 105 | 87 | 55 | 12.0 |
| RFM0.75-640-4S | 0.75 | 640 | 4.0 | 45.27 | 853.3 | 4 | 303 | 142 | 250 | 105 | 87 | 55 | 16.5 |
| RFM0.75-640-8S | 0.75 | 640 | 8.0 | 22.64 | 853.3 | 4 | 303 | 120 | 225 | 105 | 87 | 55 | 16.0 |
| RFM0.75-640-10S | 0.75 | 640 | 10.0 | 18.11 | 853.3 | 4 | 303 | 120 | 210 | 105 | 87 | 55 | 12.5 |
| RFM0.75-1000-0.5S | 0.75 | 1000 | 0.5 | 565.9 | 1333 | 8 | 440 | 165 | 445 | 85 | 82 | 75 | 49.0 |
| RFM0.75-1000-1S | 0.75 | 1000 | 1.0 | 282.9 | 1333 | 6 | 336 | 142 | 430 | 80 | 75 | 60 | 31.0 |
| RFM20.75-1000-1S | 0.75 | 1000 | 1.0 | 282.9 | 1333 | 6 | 336 | 165 | 350 | 80 | 75 | 75 | 29.5 |
| RFM0.75-1000-1S | 0.75 | 1000 | 1.0 | 282.9 | 1333 | 6 | 336 | 165 | 385 | 80 | 75 | 75 | 32.0 |
| RFM0.75-1000-2.5S | 0.75 | 1000 | 2.5 | 113.2 | 1333 | 6 | 303 | 142 | 335 | 68 | 72 | 60 | 22.0 |
| RFM1.0-1000-0.5S | 1.0 | 1000 | 0.5 | 318.3 | 1000 | 6 | 440 | 165 | 385 | 125 | 87 | 75 | 40.0 |
| RFM1.0-1000-1S | 1.0 | 1000 | 1.0 | 159.2 | 1000 | 6 | 336 | 142 | 350 | 80 | 75 | 60 | 25.0 |
| RFM1.0-1000-2S | 1.0 | 1000 | 2.0 | 79.58 | 1000 | 6 | 336 | 142 | 335 | 80 | 75 | 60 | 24.0 |
| RFM1.0-1000-2.5S | 1.0 | 1000 | 2.5 | 63.66 | 1000 | 6 | 303 | 142 | 335 | 68 | 72 | 60 | 21.5 |
| RFM1.2-750-0.5S | 1.2 | 750 | 0.5 | 165.8 | 625 | 6 | 336 | 142 | 430 | 80 | 75 | 60 | 30.5 |
| RFM1.2-1000-0.5S | 1.2 | 1000 | 0.5 | 221.0 | 833.3 | 6 | 440 | 165 | 335 | 125 | 87 | 75 | 35.0 |
| RFM1.2-1000-0.7S | 1.2 | 1000 | 0.7 | 157.9 | 833.3 | 6 | 336 | 165 | 335 | 80 | 75 | 75 | 27.5 |
| RFM1.2-1200-0.7S | 1.2 | 1200 | 0.7 | 189.5 | 1000 | 6 | 336 | 165 | 385 | 80 | 75 | 75 | 31.0 |
| RFM1.2-1250-0.65S | 1.2 | 1250 | 0.65 | 212.5 | 1042 | 6 | 440 | 165 | 335 | 125 | 87 | 75 | 35.0 |
| RFM1.2-1400-0.7S | 1.2 | 1400 | 0.7 | 221.0 | 1167 | 6 | 440 | 165 | 335 | 125 | 87 | 75 | 35.0 |
| RFM1.2-1500-0.5S | 1.2 | 1500 | 0.5 | 331.6 | 1250 | 6 | 440 | 165 | 495 | 125 | 87 | 75 | 48.0 |
| RFM1.2-2000-0.5S | 1.2 | 2000 | 0.5 | 442.1 | 1667 | 8 | 440 | 205 | 435 | 85 | 82 | 95 | 56.0 |
| RFM1.2-2000-0.65S | 1.2 | 2000 | 0.65 | 340.1 | 1667 | 8 | 440 | 165 | 495 | 85 | 82 | 75 | 48.0 |
| RFM1.4-1000-0.5S | 1.4 | 1000 | 0.5 | 162.4 | 714.3 | 6 | 440 | 165 | 335 | 125 | 87 | 75 | 35.0 |
| RFM1.4-1000-1S | 1.4 | 1000 | 1.0 | 81.2 | 714.3 | 6 | 336 | 142 | 335 | 80 | 75 | 60 | 24.0 |
| RFM1.4-2000-0.5S | 1.4 | 2000 | 0.5 | 324.8 | 1429 | 6 | 440 | 205 | 435 | 125 | 87 | 95 | 54.0 |
| RFM1.6-2000-0.5S | 1.6 | 2000 | 0.5 | 248.7 | 1250 | 6 | 440 | 205 | 460 | 125 | 87 | 95 | 54.5 |
| RFM21.6-2000-0.5S | 1.6 | 2000 | 0.5 | 248.7 | 1250 | 6 | 440 | 205 | 435 | 125 | 87 | 95 | 52.0 |
| RFM1.7-1500-0.25S | 1.7 | 1500 | 0.25 | 330.4 | 882.4 | 4 | 440 | 205 | 610 | 170 | 120 | 95 | 71.0 |
| RFM1.7-2000-0.5S | 1.7 | 2000 | 0.52 | 220.3 | 1176 | 6 | 440 | 205 | 435 | 125 | 87 | 95 | 52.0 |
| RFM1.7-1000-0.15S | 1.7 | 1000 | 0.15 | 367.1 | 588.2 | 4 | 440 | 205 | 610 | 170 | 120 | 95 | 72.0 |
| Item | Value |
|---|---|
| Installation altitude | Not above 1000 m |
| Site | No severe shock, corrosive gas, steam or explosive dust |
| Cooling-water inlet | Not above 30°C / 86°F |
| Cooling-water flow | At least 4 L/min below 1000 kvar; at least 6 L/min at 1000 kvar and above |
| Overvoltage | 1.1 × UN for 4 hours |
| Continuous current | Not above 1.35 × IN |
| Catalog standards | JB/T 7110-93 and IEC 60110-1 (1998) |
| Suffix S | Water-cooled. No S suffix on the air-cooled construction shown on the same sheet |
| Model code | RFM, voltage kV, kvar, frequency kHz, S = water-cooled |
| US standard | Applies to |
|---|---|
| IEC 60110-1 | Power capacitors for induction heating — the catalog rating standard |
| IEEE 18 | US shunt-capacitor standard buyers ask to see beside IEC 60110-1 |
| IEEE 519 | Harmonic duty seen by the capacitor bank |
| ASTM B187 | Copper bus bar in the capacitor rack |
Every figure in these tables is taken from the factory sheets in the product folder and is written in English. 1 metric ton = 1.102 US short tons. Power-supply ratings can still be negotiated to the customer requirement, as the sheet itself states. American standards are the US specifications normally requested with this equipment.
Key features
- RFM series, water-cooled (S) construction
- Catalog performance referenced to JB/T 7110-93 and IEC 60110-1
- Voltage, kvar and frequency coded in the model number
- Installed close to the furnace to shorten the high-current run
- Cooling water, catalog inlet not above 30°C, flow by kvar rating
Construction
- Film-foil elements in a steel case, water pipes, bushings and insulation oil.
- The model number reads voltage, kvar, frequency and the water-cooled suffix.
Working principle
Capacitors cancel the reactive power of the coil. The inverter then supplies mainly the power that becomes heat in the metal.
Applications
Steel, cast iron, stainless steel, copper, aluminum, aluminum alloy, brass and other non-ferrous metals.
Complete system integration
This equipment sits in the same line as the power supply, the capacitor bank, the induction coil, the magnetic yoke, the furnace body and the cooling system. A quotation can cover one item or the full line.
Customization
Capacity, voltage, frequency, dimensions and connection layout can be made to the furnace design. Send the drawing or the duty data below.
Catalog sheets
Questions before a quotation
Can the rating be customized?
Yes. Capacity, voltage, frequency, tube size and connection layout follow the furnace drawing and the metal.
What do you need for a quotation?
Furnace capacity, metal, melting temperature, melting rate, working hours, input voltage, frequency if known, tilting method and cooling-water conditions. A drawing helps.
Do you supply a single machine or the complete system?
Both. A spare coil, yoke, capacitor or cooling tower can be quoted alone. A new foundry line is quoted as a complete system.
Which metals can be melted?
Steel, cast iron, stainless steel, copper, aluminum, aluminum alloy, brass and other non-ferrous metals. The lining and the frequency follow the alloy.
Will you confirm the catalog numbers before manufacture?
Yes. The sheets on this page are the factory catalog for selection. The quotation states the rating that will be built.