The KGPS series is the medium-frequency power supply for the melting system. Rectifier pulse count, inverter control, protection and the capacitor bank decide whether the furnace melts cleanly and whether the line stays on the grid.
KGPS II power supply — factory sheet. The Chinese column heading is input voltage; the printed English heading on the scan says Output Voltage for the same 380 / 660 / 1000 V column.| Input voltage (V) | Rectifier | Medium-frequency output (V) | Furnace body voltage (V) | Output power (kW) | Furnace capacity (t) | Output frequency (Hz) |
|---|
| 380 | 6 or 12 pulse | 750 | 750/1500 | 20–1000 | 0.01–3 | 150–1000 |
| 660 | 6 or 12 pulse | 1200 | 2400 | 500–3000 | 1–8 | 500–1000 |
| 660 | 6 or 12 pulse | — | — | 2000–4000 | 2–10 | 500–1000 |
| 1000 | 12 or 24 pulse | 1600 | 3200 | 4000–8000 | 5–12 | 250–500 |
| 1000 | 24 pulse | — | — | 8000–20000 | 12–40 | 150–250 |
Parallel inverter — factory sheet| Item | Catalog statement |
|---|
| Start | Automatic frequency-sweep start |
| Rectifier control | Large-scale phase-shift trigger, strong anti-interference |
| Current limit | Holds under load change so a bridge does not trip the supply |
| Protection | Short circuit, open circuit, phase loss, low water, water shortage, over-current, over-voltage, phase stagger |
| Fault stop | Automatic safe stop |
| Rectifier pulse | 12 pulse and 24 pulse to cut grid harmonics |
| Melt under 1 t | One furnace in 20 to 50 minutes |
| Power saving stated on the sheet | 10–20% against a traditional medium-frequency furnace |
Measured harmonic current, per-unit of fundamental — factory sheet| 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 |
American standards| 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.
The parallel inverter power supply is the usual converter for a coreless melting furnace. It starts across a wide load range and keeps a stable current limit when scrap bridges or the bath condition changes.
KGPS II power supply — factory sheet. The Chinese column heading is input voltage; the printed English heading on the scan says Output Voltage for the same 380 / 660 / 1000 V column.| Input voltage (V) | Rectifier | Medium-frequency output (V) | Furnace body voltage (V) | Output power (kW) | Furnace capacity (t) | Output frequency (Hz) |
|---|
| 380 | 6 or 12 pulse | 750 | 750/1500 | 20–1000 | 0.01–3 | 150–1000 |
| 660 | 6 or 12 pulse | 1200 | 2400 | 500–3000 | 1–8 | 500–1000 |
| 660 | 6 or 12 pulse | — | — | 2000–4000 | 2–10 | 500–1000 |
| 1000 | 12 or 24 pulse | 1600 | 3200 | 4000–8000 | 5–12 | 250–500 |
| 1000 | 24 pulse | — | — | 8000–20000 | 12–40 | 150–250 |
Parallel inverter — factory sheet| Item | Catalog statement |
|---|
| Start | Automatic frequency-sweep start |
| Rectifier control | Large-scale phase-shift trigger, strong anti-interference |
| Current limit | Holds under load change so a bridge does not trip the supply |
| Protection | Short circuit, open circuit, phase loss, low water, water shortage, over-current, over-voltage, phase stagger |
| Fault stop | Automatic safe stop |
| Rectifier pulse | 12 pulse and 24 pulse to cut grid harmonics |
| Melt under 1 t | One furnace in 20 to 50 minutes |
| Power saving stated on the sheet | 10–20% against a traditional medium-frequency furnace |
Measured harmonic current, per-unit of fundamental — factory sheet| 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 |
American standards| 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.
High-power medium-frequency supplies cover the 5 ton to 40 ton class, in catalog bands up to about 20,000 kW. A 12-pulse or 24-pulse rectifier is used so a large furnace can be connected without disturbing the plant grid.
KGPS II power supply — factory sheet. The Chinese column heading is input voltage; the printed English heading on the scan says Output Voltage for the same 380 / 660 / 1000 V column.| Input voltage (V) | Rectifier | Medium-frequency output (V) | Furnace body voltage (V) | Output power (kW) | Furnace capacity (t) | Output frequency (Hz) |
|---|
| 380 | 6 or 12 pulse | 750 | 750/1500 | 20–1000 | 0.01–3 | 150–1000 |
| 660 | 6 or 12 pulse | 1200 | 2400 | 500–3000 | 1–8 | 500–1000 |
| 660 | 6 or 12 pulse | — | — | 2000–4000 | 2–10 | 500–1000 |
| 1000 | 12 or 24 pulse | 1600 | 3200 | 4000–8000 | 5–12 | 250–500 |
| 1000 | 24 pulse | — | — | 8000–20000 | 12–40 | 150–250 |
Parallel inverter — factory sheet| Item | Catalog statement |
|---|
| Start | Automatic frequency-sweep start |
| Rectifier control | Large-scale phase-shift trigger, strong anti-interference |
| Current limit | Holds under load change so a bridge does not trip the supply |
| Protection | Short circuit, open circuit, phase loss, low water, water shortage, over-current, over-voltage, phase stagger |
| Fault stop | Automatic safe stop |
| Rectifier pulse | 12 pulse and 24 pulse to cut grid harmonics |
| Melt under 1 t | One furnace in 20 to 50 minutes |
| Power saving stated on the sheet | 10–20% against a traditional medium-frequency furnace |
Measured harmonic current, per-unit of fundamental — factory sheet| 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 |
American standards| 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.
A double power supply, also called a one-to-two supply, feeds two furnaces from one rated power. One furnace melts. The other holds, pours or is preheated. The two furnaces can also be swapped.
Double power supply, one-to-two — factory sheet| No. | Catalog statement |
|---|
| 1 | Continuous batch production from two sets of power control |
| 2 | Large-piece casting with lower unit power use and a higher power factor |
| 3 | Non-stop melting: hold temperature when needed, higher equipment use |
| 4 | Both furnaces can be preheated and sintered at the same time |
| 5 | Small footprint, simpler installation and maintenance |
| 6 | If one supply or one furnace stops, the other can be swapped in |
GWB holding furnace — factory sheet| Model | Rated capacity (t) | Rated power (kW) | Incoming line voltage (V) | Holding temperature (°C) | Heat-up rate (t/h) | Output frequency (Hz) | Furnace body voltage (V) | Unit power use (kWh/t) | Cooling water (t/h) |
|---|
| GWB3-300/0.7 | 3 | 300 | 380 | 1580 | 7.5 | 250–500 | 1500 | 49 | 9 |
| GWB5-500/0.6 | 5 | 500 | 380 | 1580 | 12.8 | 250–500 | 1500 | 44 | 12 |
| GWB8-800/0.5 | 8 | 800 | 660 | 1580 | 17.6 | 250–500 | 2400 | 43 | 15 |
| GWB10-1000/0.5 | 10 | 1000 | 660 | 1580 | 24.5 | 250–500 | 2400 | 42 | 1 |
| GWB12-1200/0.5 | 12 | 1200 | 660 | 1580 | 30 | 250–500 | 2400 | 40 | 25 |
| GWB15-1500/0.25 | 15 | 1500 | 660 | 1580 | 36 | 150–250 | 2400 | 40 | 28 |
| GWB20-2000/0.25 | 20 | 2000 | 660 | 1580 | 47 | 150–250 | 2400 | 40 | 36 |
| GWB30-3000/0.15 | 30 | 3000 | 1000 | 1580 | 86 | 150–250 | 3200 | 40 | 55 |
| GWB40-4000/0.15 | 40 | 4000 | 1000 | 1580 | 86 | 150–250 | 3200 | 38 | 70 |
| GWB50-5000/0.15 | 50 | 5000 | 1000 | 1580 | 108 | 150–250 | 3200 | 38 | 80 |
American standards| US standard | Applies to |
|---|
| NFPA 86 | Standard for Ovens and Furnaces — furnace safety for US plants |
| NFPA 70 (NEC) | National Electrical Code — incoming power and grounding |
| IEEE 519 | Harmonic limits at the plant point of common coupling |
| UL 508A | Industrial control panels on the power supply |
| ASTM A876 | Grain-oriented electrical steel for the magnetic yoke |
| ASTM B75 | Seamless copper tube for the induction coil |
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.
