Technical Data
Furnace components
Use these pages to narrow a furnace, a power supply, a capacitor bank, a cooling tower or a component. Final numbers are in the quotation.
Water-Cooled Copper Induction Coil for Medium Frequency Furnaces
The water-cooled copper induction coil is the working part of a medium-frequency furnace. It is wound to the crucible size, insulated for the furnace voltage, and cooled so the lining survives repeated heats.
| Item | Catalog value |
|---|---|
| Conductor | Rectangular copper tube, 99.9% copper |
| US material standard | ASTM B75 seamless copper tube |
| Insulation | Electrostatic spray, high-strength epoxy |
| Insulation withstand | Above 5000 V |
| Turn spacing after fixing | Error not above 2 mm |
| End cooling | Water-cooled turns at the top and bottom of the coil |
| Large coil shown | 60 t medium-frequency coil on the GW sheet |
| Shell on small furnaces | 50 kg–3000 kg aluminum-alloy shell on the same sheet |
| US standard | Applies to |
|---|---|
| ASTM B75 | Seamless copper tube, water-cooled coil |
| ASTM B152 | Copper sheet and strip where used on connections |
| NFPA 86 | Furnace water-circuit safety interlock |
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.
Magnetic Yoke for Medium Frequency Induction Furnaces
The magnetic yoke is laminated silicon steel fitted outside the induction coil. It gathers the external field, cuts stray flux, supports the coil and shields the furnace frame.
| Item | Catalog value |
|---|---|
| Steel | Cold-rolled high-permeability silicon steel |
| US material standard | ASTM A876 grain-oriented electrical steel |
| Sheet thickness | 0.35 mm |
| Shape | Arc matches the outside of the induction coil |
| Clamps | Stainless side plates and stainless tie rods |
| Cooling pipe test | 0.45 MPa, no leak within 15 minutes |
| Duty | Collects stray flux, supports the coil, shields the frame |
| US standard | Applies to |
|---|---|
| ASTM A876 | Flat-rolled grain-oriented electrical steel, 0.35 mm class |
| ASTM A240 | Stainless side plates and tie hardware |
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.
DC Smoothing Reactor for Medium Frequency Power Supplies
The DC smoothing reactor sits on the rectifier bus of the medium-frequency power supply. It smooths the direct current and limits how fast current rises if the inverter sees a short circuit.
| Item | Catalog value |
|---|---|
| Place in the circuit | DC bus between the rectifier and the inverter |
| First duty | Smooths the rectifier current |
| Second duty | Limits current rise if the inverter sees a short circuit |
| US harmonic standard | IEEE 519, together with 6, 12 or 24 pulse rectification |
| Rectifier | 5th | 7th | 11th | 13th | 17th | 19th | 23rd | 25th |
|---|---|---|---|---|---|---|---|---|
| 6 pulse | 0.175 | 0.11 | 0.045 | 0.029 | 0.015 | 0.01 | 0.009 | 0.008 |
| 12 pulse | — | — | 0.007 | 0.004 | 0.002 | 0.001 | 0.0009 | 0.0008 |
| 24 pulse | — | — | — | — | — | — | 0.0006 | 0.0005 |
| US standard | Applies to |
|---|---|
| IEEE 519 | Harmonic current limits, matched to 6 / 12 / 24 pulse rectifiers |
| NFPA 70 (NEC) | Incoming voltage, grounding and disconnect |
| UL 508A | Control cabinet construction |
| NEMA 250 | Enclosure type for the power cabinets |
| NEMA MG 1 | Cooling-fan and pump motors |
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.
Furnace Changeover Switch for One-to-Two Melting Lines
The furnace changeover switch moves the medium-frequency supply from one furnace to the other. Electric or manual versions are used on one-to-two melting and holding lines.
| Item | Catalog value |
|---|---|
| Duty | Moves the medium-frequency supply from one furnace to the other |
| Operation | Electric or manual |
| Transfer time | About 20 seconds |
| Contact | High clamping force for the furnace current |
| US standard | Applies to |
|---|---|
| IEEE 519 | Harmonic current limits, matched to 6 / 12 / 24 pulse rectifiers |
| NFPA 70 (NEC) | Incoming voltage, grounding and disconnect |
| UL 508A | Control cabinet construction |
| NEMA 250 | Enclosure type for the power cabinets |
| NEMA MG 1 | Cooling-fan and pump motors |
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.
Water-Cooled Cable for Medium Frequency Induction Furnaces
Water-cooled cables connect the power supply and capacitor bank to the furnace coil. They flex when the furnace tilts and carry both the medium-frequency current and their own cooling water.
| Item | Catalog value |
|---|---|
| Duty | Flexible link from the power supply and capacitor bank to the tilting furnace |
| Construction | Stranded conductor, outer hose, lugs and water ports |
| Supply scope | 1 set included with a GW furnace system |
| US material note | Copper to ASTM B187 where a rigid bus is used instead of the cable |
| US standard | Applies to |
|---|---|
| ASTM B75 | Seamless copper tube, water-cooled coil |
| ASTM B152 | Copper sheet and strip where used on connections |
| NFPA 86 | Furnace water-circuit safety interlock |
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.
Water-Cooled Copper Busbar for Furnace Capacitor and Output Runs
Water-cooled copper busbar is used on the fixed run between the power supply, the capacitor bank and the furnace connection. It is specified where a cable is not required to move.
| Item | Catalog value |
|---|---|
| Duty | Flexible link from the power supply and capacitor bank to the tilting furnace |
| Construction | Stranded conductor, outer hose, lugs and water ports |
| Supply scope | 1 set included with a GW furnace system |
| US material note | Copper to ASTM B187 where a rigid bus is used instead of the cable |
| US standard | Applies to |
|---|---|
| ASTM B75 | Seamless copper tube, water-cooled coil |
| ASTM B152 | Copper sheet and strip where used on connections |
| NFPA 86 | Furnace water-circuit safety interlock |
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.