什么是有线和平?

安平是导体在使用条件下能连续携带而不超过其温度分级的最大电流(以安平为单位).

为什么距离限制有线能力?

随着距离的增加,电线的阻力也随之增大. 高电阻导致高电流下电压下降. 要将降压压控制在安全范围内,必须缩短最大电流的长度.

限制因素是什么:热速率或电压下降?

对于短跑,电线的热速平和度通常是限制因素. 对于长跑,先达到电压下降极限,需要去除最大负载或更大的电线.

最大负载电缆计算器

确定一条电缆在指定距离上可以承载的最大安全电荷(Amps和kW). 确保负载不超过标准安平或指定的电压下放阈值.

System Constraints

Source Voltage (V)

System Phase

Conductor Material

Max Drop Allowed (%)

Conductor Size (AWG / Metric)

One-Way Distance

Maximum Allowed Load

Max Current (Amps)

at voltage drop limit

Max Active Power

kW / kilowatts

Calculation parameters:

Voltage Drop Limit: -- V

Resistance: -- Ω/km

Max Load Cable Calculation Formula

We solve the basic Voltage Drop equation in reverse to calculate the maximum permissible current before hitting the drop limits:

Allowed Drop Limit (V_limit) = V_source × (Max_Drop_percent ÷ 100)

Single Phase (1φ): I_max = [V_limit × A] ÷ [2 × L × ρ]

Three Phase (3φ): I_max = [V_limit × A] ÷ [√3 × L × ρ]

Max Power (kW) = [V_source × I_max × PhaseFactor] ÷ 1000

• PhaseFactor: Single Phase = 1.0 (apparent power), Three Phase = √3 ≈ 1.732.

• Cable physical resistivity properties are modeled standard at 75°C.

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How to use Max Load Cable Calculator

选择电路相,系统电压,以及导电材料(Copper或铝).
选择电缆大小( AWG 或 Metric mm2)并输入运行距离 .
设定最大允许电压下降百分比( 默认为3%) 来计算最大安全负载 .

{姓名}是什么来着?

在设计电路时,电缆必须大小来防止过热(基于导电器的安乐分级)并限制电压在长距离上下降. 虽然电线尺寸对20个阿姆斯人来说可能是热能安全的,但长跑100英尺可能导致不可接受的电压下降。

这个计算器决定了限制因素——要么是热速率,要么是电压下降(例如3%的限制)——并报告您能够安全地通过电路运行的最大电流和总功率。

FAQ

什么是有线和平?: 安平是导体在使用条件下能连续携带而不超过其温度分级的最大电流(以安平为单位).
为什么距离限制有线能力?: 随着距离的增加,电线的阻力也随之增大. 高电阻导致高电流下电压下降. 要将降压压控制在安全范围内,必须缩短最大电流的长度.
限制因素是什么:热速率或电压下降?: 对于短跑,电线的热速平和度通常是限制因素. 对于长跑,先达到电压下降极限,需要去除最大负载或更大的电线.

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Author

Omar Hassan"The Number Cruncher"

Engineer & Unit Conversion Specialist

Omar is a mechanical engineer by training and a unit-conversion enthusiast by passion. He has built calibration systems for aerospace and automotive manufacturers and knows firsthand how a single decimal error can cost millions in rework. His mission is to make every conversion instant, accurate, and accessible to everyone, whether they are a student, tradesperson, or practicing engineer, with no advanced degree required.

📖 Max Load Cable Calculator on Wikipedia·Electricity Calculators on Wikipedia·Max Load Cable Calculator on Britannica

最大负载电缆计算器

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