满载电流计算器
根据功率、电压和相数计算满载电流。
尝试一个工程 6
每项工作都会预填示例数值。请替换为您自己的数值。
- Find a 22 kW motor's full load currentThe line current a 22 kW three phase motor takes at 400 V.
- Find the current of a 7.2 kW chargerThe current of a single‑phase 7.2 kW load.
- Find the current of 100 kVAThe line current of a 100 kVA load at 400 V.
- Find the current of a 3 kW heaterThe current of a 3 kW heater at 230 V.
- Find the current of a chillerThe current of a 45 kW chiller at 0.85 power factor.
- Find the current of a commercial ovenThe current of a 15 kW three‑phase oven.
输入
使用默认输入值的示例计算。
- 相
- 三相
- 电压
- 400 V
- 额定单位
- kW
- 额定值
- 15
- 功率因数
- 0.9
- 效率
- 1
满载电流
24.06A
- 所取视在功率
- 16.67kVA
- 输出功率
- 15kW
此结果仅供设计参考。请对照现行标准进行核验。
计算步骤
- 输出功率15kW
- 所取视在功率16.67kVA
- 满载电流结果24.06A
关于此计算器
How this is calculated
The tool works out the full load current of a load. It uses the power, the voltage, the power factor and the efficiency. It works on one phase or three. It reads no table, so it cites no clause.
- Supply. You pick one phase or three and enter the voltage. The voltage you enter sets the divisor in the last step.
- Output power. You enter the load in kW or kVA. For a kW load, the tool takes this as the output power.
- Apparent power drawn. It divides the output power by the efficiency and by the power factor. A kVA entry skips the power factor step.
- Full load current. On one phase, it divides the apparent power by the voltage. On three phases, it divides by the voltage and by the square root of three.
On three phases, enter the line voltage, such as 400 V. On one phase, enter the phase voltage, such as 230 V.
Worked example
- A 15 kW three‑phase load at 400 V. The power factor is 0.9 and the efficiency is 1. The apparent power drawn is 16.67 kVA. The full load current is 24.06 A.
Limits
The result is the steady running current. It is not the starting current. A motor draws more current at start. Use the motor tool for the starting current.
The tool assumes a balanced load on three phases. It does not add a margin for the cable or the breaker. Size the cable from the design current with the cable size calculator. The tool gives no harmonic or neutral current.
Efficiency is a value between 0 and 1. A kVA entry is already an apparent power, so the tool does not divide it by the power factor.
Check the efficiency you enter. A motor rating in kW is a shaft output, so enter the motor efficiency. A resistive heater has an efficiency of 1. Check the power factor on the nameplate. A low power factor raises the current for the same kW.
See also: Commercial kitchen kW to amps, Three‑phase power kVA to amps at 400 V and the three‑phase power tool.
问题
结果仅供设计参考。请依据现行标准核对。
满载电流计算器有什么作用？
工具将负荷额定值换算为电流。请输入以千瓦或千伏安表示的额定值、电压和相数。它会报告该负荷的满载电流、有功功率和视在功率。
哪些输入最重要？
额定值和电压决定电流。对于千瓦额定值，功率因数和效率都会提高视在功率，因此两者都会增大电流。对于千伏安额定值，不计效率。三相结果需除以根号三。
本工具不做什么？
本工具不选定电缆或保护装置。因结果为直接计算，故不引用标准表格。请将其给出的电流作为电缆截面工具中的设计电流。输入值保存在页面地址中，因此链接可复现结果。
计算示例
- Commercial kitchen kW to amps full load currentTurning a 30 kW commercial kitchen nameplate load into 45.58 A at 400 V three phase, with the power factor step that a plain kW to amps sum leaves out.
- Ohm's law on a 3 kW water heater elementWork the current and working resistance of a 3 kW, 230 V water heater element with Ohm's law, why a cold meter reading is lower, then a 9 kW three‑phase bank.
- Motor circuit for a 15 kW pump: DOL or star-deltaSize a 15 kW 400 V pump circuit: cable, breaker, contactor and overload relay. Compare DOL, star-delta, soft starter and drive starts.
- 22 kW EV charger amps at 400 V three‑phaseA 22 kW three‑phase EV charger draws 31.75 A at 400 V. See the inputs, the clause, the arithmetic and the current that feeds cable sizing and demand.
背景
- Ohm's law and power on d.c. and a.c.Ohm's law and the power formulas on d.c., single‑phase and three‑phase a.c.: how power factor and impedance change them, and how any two values give the rest.
- Control panels and PLC wiringSegregation of LV and ELV in a control panel, terminal and numbering practice, panel earthing, and the 24 V DC voltage drop that long instrument loops fail on.
- Motor circuits and startingHow full load current sizes the cable and starting current sizes the device on a motor circuit, with a worked 22 kW 400 V motor and the cable the tool selects.
- Power factor and reactive powerWhat power factor is, why a low one costs current and capacity, how a capacitor bank corrects it in steps, and when harmonics call for a detuned bank.
- Industrial switchboards: fault rating, form, IPWhat the three ratings on an industrial switchboard or motor control centre mean, how each one is chosen, and which AmpSize tools feed the numbers behind them.
相关工具
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