Proven Kulun thyristor control technology — reliable, high accuracy, low ripple
With five-limb transformers for low-voltage, high-current output
Custom air-cooled, water-cooled or built-in water circulation structures
6-pulse, 12-pulse and 24-pulse rectification for higher power factor and lower harmonics
Output polarity reversing and manual/auto switchover
KULUN / DC Power Supply
DCP3 High-power SCR (Thyristor) DC Power Supply
KULUN DCP3: high-power thyristor DC power supply for submerged arc and DC arc furnaces, metallurgy, electrolysis, electroplating and surface treatment.
Output Voltage RangeDC 10–1000 V
Output Current RangeDC 10–300 kA
Features
Specifications
| Input | Mains supply | AC 380 V / 440 V / 690 V / 1 kV / 6 kV / 10 kV |
| Control supply | AC 85–265 V, 50/60 Hz | |
| Output | Output voltage | DC 10–1000 V |
| Output current | DC 10–300 kA | |
| Performance | Control stability | Better than 0.2% |
| Control accuracy | Better than 0.5% | |
| Key features | Closed-loop mode | Open loop, constant current, constant voltage or constant power, selectable |
| Firing mode | Phase-shift | |
| Setpoint signal | Analog, keypad digital or communication setpoint, selectable | |
| Inputs | 2 analog inputs, 2 digital inputs | |
| Outputs | 1 relay output, NO contact, AC 240 V/3 A, DC 24 V/5 A | |
| Communication | Modbus RTU, PROFIBUS, PROFINET | |
| Temperature PID loop | 8-segment temperature profile; smart PID, fuzzy PID or standard PID; AT auto-tuning | |
| Protection | Mains fault | Protection on mains frequency out of range, undervoltage or input phase loss |
| Load aging | Protection on load aging fault | |
| Overheating | Protection when thyristor temperature > 85 °C | |
| Overcurrent | Protection when output current reaches the set multiple | |
| Load break | Protection when load current falls below the threshold setting |
Typical Applications
Electrolysis & Electroplating
For processes demanding DC stability and low ripple; configured to bath voltage, bath current and load fluctuation.
Smelting & Surface Treatment
Continuous high-current DC supply for metal smelting and surface treatment under varying duty conditions.
Industrial Furnaces & Charging
Custom-built for industrial furnaces and battery charging by output voltage, current and process requirements.
FAQ
Which industries and processes suit SCR DC power supplies?
Electrolysis, electroplating, smelting, surface treatment, industrial furnaces, charging and high-current DC supply — configured per load and process.
Why do industrial processes use DC supply?
DC output stabilizes voltage, current and power control — essential for electrolysis, electroplating and heating processes sensitive to polarity, fluctuation and continuity.
Why choose a thyristor (SCR) linear DC supply?
It handles high-power, high-current loads with a robust, easily maintained structure — suited to long continuous runs and harsh industrial sites.
Which processes need output polarity reversing?
Electrolysis, electroplating and surface treatment processes that periodically reverse current direction; reversing is configured to the process cycle.
Where does manual/auto switchover apply?
Manual for commissioning, maintenance or trial runs; automatic by timer, process signal or host command in production.
How to choose between 6-pulse, 12-pulse and higher?
Decide by power level, ripple, harmonics, grid conditions and budget; more pulses generally improve output smoothness and harmonic performance.
Three-phase bridge vs. double-star rectification?
Both work for SCR rectifiers. The bridge is simpler; double-star suits certain high-current, reversing and cooling configurations. Final choice follows output specs and transformer design.
How are coarse and fine output adjustment achieved?
Coarse adjustment via transformer taps; thyristors provide continuous 0–100% fine adjustment for process load changes.
Air, water or pure-water cooling?
Air cooling for medium/small power or limited water supply; high-current, high-heat or continuous-duty projects usually need water or pure-water cooling — decided by losses, environment and maintenance.
What communication and protection options exist?
Modbus RTU/TCP, PROFIBUS, PROFINET per project; protection can include overvoltage, overcurrent, undervoltage, short circuit, overheating, water temperature/pressure and phase loss — per project technical agreement.
Selection Inquiry
Share your industry, load conditions, voltage, current, power range and site environment — our engineers will help you confirm the right configuration.
