1、 Parameter Selection Table (Core Parameters Directly Corresponding to Scenarios)
| Application scenarios
|
Controllable silicon type
|
Rated voltage requirements
|
Rated current requirements
|
Trigger method
|
Essential protection configuration |
| 380V three-phase electricity
|
Three phase three wire system/Three phase four wire system thyristor module | ≥ 600V (line voltage adaptation)
|
Each phase current ≥ electric heating tube phase current × 1.5 times
|
Three phase synchronous triggering module (120 ° phase difference)
|
Phase loss protection, three-phase current imbalance protection, fast fuse |
| 380V two-phase electricity (dual phase line)
|
Single phase bidirectional thyristor (SCR) or module
|
≥ 600V (peak voltage adaptation)
|
Total current ≥ total current of electric heating tube × 1.5-2 times
|
Single phase zero crossing/phase shifting trigger (synchronized with the power supply) | Quick fuse, overcurrent relay, voltage surge absorber
|
Note： Calculation of phase current of electric heating tube：
Three phase Y connection=total power ÷ (√ 3 × 380V); Three phase Δ connection=total power ÷ (3 × 380V); Two phase electric time=total power ÷ 380V.
2. 380V two-phase electrical wiring (parallel connection method)
Power end: Connect the 380V dual phase lines (L1, L2) to the input terminal of the single-phase thyristor module, and parallel the surge absorber (RC circuit).
• Load end: Two double headed electric heating tubes are connected in parallel, with each end connected to a thyristor output terminal and another phase line to avoid uneven voltage distribution caused by series connection.
Control end: The triggering module is connected to one of the phase lines as a synchronization signal to ensure that the conduction angle is consistent with the power phase and reduce current surges.
• Protection end: The fast fuse is connected in series on the power input side, with a rated current matching 1.2 times the total current of the electric heating tube.
3、 Selection&Wiring Key Supplement
• Selection of thyristor: Industrial grade modules (rather than discrete devices) are preferred. For high-power scenarios (≥ 10kW), it is recommended to use anti parallel thyristor modules for stronger stability.
• Wiring material: The diameter of the power line is selected according to the current (3-5A per square millimeter), and the control line is shielded to avoid electromagnetic interference triggering signals.
Debugging points: First, test whether the thyristor trigger is normal under no-load conditions during the initial start-up, and then run with load to monitor whether the three-phase current (three-phase scenario) or total current (two-phase scenario) is balanced.
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Post time: Nov-18-2025
