Electric Heating Power / Connection
Compute heating power, phase current, and line current for single-phase / star / delta connection from voltage and per-phase resistance, or scale power with voltage.
Key points
Electric Heating Power / Connection: Compute heating power, phase current, and line current for single-phase / star / delta connection from voltage and per-phase resistance, or scale power with voltage. Formula: P_star = U²/R | P_delta = 3U²/R | P₂ = P₁·(U₂/U₁)². Enter parameters on the DD-CAT IDE online tool page to get results instantly, with a calculation-model diagram that updates with the inputs. Heating elements are designed for a rated voltage: a 220 V element on 380 V is severely overloaded, while a 380 V element on 220 V loses much power (P∝U²). In star, each phase sees phase voltage (about 220 V in a 380 V system); in delta, each phase sees line voltage. At equal resistance, delta power is three times star power.
Inputs
P_star = U²/R | P_delta = 3U²/R | P₂ = P₁·(U₂/U₁)²Calculation model (updates with parameters)
| Total power P | 7.22 kW | 星形Topology，冷态Resistance估算 |
| Per-phase power P_phase | 2.407 kW | 单根加热管Power |
| Phase current I_phase | 10.97 A | 流过每根加热管的current |
| Line current I_line | 10.97 A | 选接触器 / 断路器 / 导线用 |
| Per-phase resistance R | 20 Ω | 冷态Value；热态Resistanceliter高会使实际Power略降 |
| Topology | 星形 | Y 接相Voltage为线Voltage 1/√3 |
| Star power at same resistance | 7.22 kW | P_Y = U²/R |
| Delta power at same resistance | 21.66 kW | P_Δ = 3U²/R = 3×P_Y |
Engineering notes
- Heating elements are designed for a rated voltage: a 220 V element on 380 V is severely overloaded, while a 380 V element on 220 V loses much power (P∝U²).
- In star, each phase sees phase voltage (about 220 V in a 380 V system); in delta, each phase sees line voltage. At equal resistance, delta power is three times star power.
- Cold resistance is lower than hot resistance, so initial current is higher; leave margin for cold current when selecting contactors / breakers and keep phases balanced.
FAQ
- What is Electric Heating Power / Connection for?
- Compute heating power, phase current, and line current for single-phase / star / delta connection from voltage and per-phase resistance, or scale power with voltage.
- What is the formula for Electric Heating Power / Connection?
- Core formula: P_star = U²/R | P_delta = 3U²/R | P₂ = P₁·(U₂/U₁)². The tool returns results instantly using this formula and the selected parameters.
- What engineering notes should I keep in mind when using Electric Heating Power / Connection?
- Heating elements are designed for a rated voltage: a 220 V element on 380 V is severely overloaded, while a 380 V element on 220 V loses much power (P∝U²). In star, each phase sees phase voltage (about 220 V in a 380 V system); in delta, each phase sees line voltage. At equal resistance, delta power is three times star power. Cold resistance is lower than hot resistance, so initial current is higher; leave margin for cold current when selecting contactors / breakers and keep…