Conclusion: both submerged-arc and electric-arc furnace supplies are high-power industrial power applications whose shared trait is violent load fluctuation and strong shock — they demand high capacity, shock resistance, protection strategy, cooling and field integration. The first decision is grid condition and power level; then confirm output voltage/current range, overload capacity, arc stability and grid disturbance control. The concrete scheme should be evaluated against the actual site load.
1. Common difficulties of both loads
Submerged-arc furnaces (ferroalloy, calcium carbide, yellow phosphorus) and DC arc furnaces both show "high current, low voltage, violent load swing". Electrode movement, charge collapse, arc striking and short circuits swing the load within a very short time, so the supply must withstand short-time overload and current shock, with fast yet selective protection.
2. Key selection points
| Dimension | Submerged-arc supply | Electric-arc supply |
|---|---|---|
| Point | Submerged-arc focus | Electric-arc focus |
| Grid & capacity | Transformer capacity, power level | Grid disturbance, shock suppression |
| Output range | Stable high-current low-voltage | Arc current, arc stability |
| Shock | Withstand short circuit, collapse | Withstand short circuit, fast recovery |
| Cooling | Long continuous running | Large-current conductor and cabinet cooling |
3. Special needs of DC arc-furnace supply
A DC arc-furnace supply must focus on arc stability, shock resistance, current response and grid disturbance control. SCR rectifier and high-power DC supplies can be evaluated for the site; current response speed decides arc-strike success and arc-length stability, while grid disturbance control decides whether other equipment on the same busbar is affected.
4. KULUN solution directions
Around submerged-arc, electric-arc and metallurgical loads, high-power DC supply, SCR DC supply and a control system can be evaluated, configured by voltage/current level, overload factor, cooling method and automation interface. Concrete model and parameters need the project capacity and site grid condition.
5. What to confirm before selecting
- Grid condition, transformer capacity and power level.
- Output voltage, current range and short-time overload ability.
- Load shock, fluctuation and protection strategy.
- Water- or air-cooling, cabinet heat dissipation and installation space.
- Remote control, monitoring, alarm and automation interface.
6. FAQ
Can one type of supply serve both furnaces?
Both sit on a high-power rectifier / DC supply platform, but the emphasis differs: submerged-arc stresses steady high current over time; arc furnaces stress arc striking and stability. One platform can be adapted by parameters and protection, but the scheme must be evaluated per load.
How is short-circuit shock protected?
Fast protection logic (over-current, short-circuit, arc-loss detection) and current limiting hold the short-circuit current down and alarm within milliseconds; the device itself is shock-rated. Exact action values and delays must be stated at selection.
Why does cooling matter so much?
High-power DC conductors heat up and run continuously for long periods; cooling mode (water/air) directly sets rated output and life. Verify ambient temperature, conductor cross-section and air path, not just the nameplate current.
7. Timeliness
Timeliness: compiled from KULUN Electric high-power supply documentation and technical articles, September 2026. Capacity, voltage level and protection configuration for a specific model remain subject to the datasheet and project confirmation.
