What is an Inductive Reactance : Definition, Unit and Formula

与电力有关的着名法律是“欧姆法”。欧姆法律提供了描述的实证关系电导率of various electrically conductive materials. According to this law, the current flowing in a conductor is directly proportional to the voltage across the conductor, with resistance as a proportionality constant. Here, the units of current are Ampere, units of voltage are given in volts, and units of resistance are Ohms. In physics, this law is usually also used to refer to various generalizations of the law, such as in Vector form in electromagnetics. Similarly, when working with ACinductors, ohms law is used, where resistance is referred to as “Inductive Reactance” instead of “resistance”.

What is Inductive Reactance?

当将电压施加到电感器时,在电感电路上感应电流。然而,该电流不会立即产生,但是以由电感器的自诱导值确定的快速速率生长。感应电流受电感线圈绕组中存在的电阻元件的限制。这里,电阻量取决于施加电压与诱导电流的比率,如欧姆的法律所示。


下图是用于计算电感电抗的电感电路。

归纳 - 电抗
归纳 - 电抗

但是,当电感器连接到AC电路时,电流的流量不同。这里,使用正弦供应。因此,发生电压和电流波之间的相位差。现在,当AC电源用于电感线圈时,除了线圈的电感之外,电流也必须从AC波形的频率面对反对。在AC电路中连接的电感器中的电流面临的这种电阻被命名为“电感电阻”。

Difference Between Inductance and Reactance

电感是当在其内部的电流变化时,材料在其上引起电压的能力。电感的符号是“L”。然而,reactanceis the property of electrical materials that opposes the change in current. The units of reactance are “Ohm’s” and it is denoted by the symbol “X” to distinguish it from normal resistance.

电抗与之有效electrical resistance但与抵抗不同,电抗不会像热量散发电力。相反,它将能量存储为电抗值并将其返回给电路。理想的电感器具有零电阻,而理想的电阻具有零电抗。

归纳抗抵抗公式衍生

Inductive reactance is the term related to AC circuits. It opposes the flow of current in AC circuits. In an AC inductive circuit due to phase difference, the current waveform “LAGS” the applied voltage waveform by 90 degrees .i.e if the voltage waveform is at 0 degrees, the current waveform will be at -90 degrees.

In an Inductive circuit, the inductor is placed across the AC voltage supply. The self-induced emf in the inductor increases and decreases with the increase and decrease in the supply voltage’s frequency. Self-induced emf is directly proportional to the rate of change of current in the inductor coil. The highest rate of change occurs when the supply voltage waveform crosses over from the positive half cycle to a negative half cycle or vice-verse.

在电感电路中,电流滞后。因此,如果电压为0度,则电流相对于电压为-90度。因此,当考虑正弦波形时,电压波形VL可以被归类为正弦波和电流波形ILas a negative cosine wave.

因此,在一个点处的电流可以定义为:

IL= I.最大限度. sin(ωt – 900) , φωis in radians and ‘t’ in seconds

电感电路中的电压和电流的比率给出了电感式电抗的值L

因此,X.L= V.L/ ILohms = ωL = 2πfL ohms

这里,L是电感,f是频率,2πf=ω

从这个来源,它可以seen that the Inductive reactance is directly proportional to frequency ‘f’ and inductance ‘L’ of the inductor. With an increase in either frequency of voltage or inductance of the coil, the overall reactance of the circuit increases. As the frequency increases to infinity, the inductive reactance also increases to infinity acting similar to an open circuit. For a dip in frequency to zero, the inductive reactance also decreases to zero, acting similar to a short circuit.

象征

电感电抗是当供应AC电压时电感器中的电流所面对的电阻。其单位类似于阻力单位。感应电抗的象征是“xL“。当电流相对于电压电感器时,当电流滞后90度,通过使另一个量的值可以容易地计算。如果已知电压,则通过电压波形的负90度偏移,可以导出电流波形。

例子

Let’s look at an example to calculate the inductive reactance.

An inductor with inductance 200mH and zero resistance is connected across a 150v voltage supply. The frequency of voltage supply is 60Hz. Calculate the inductive reactance and the current flowing through the inductor

归纳电抗

XL=2πfl.

=2π×50×0.20

= 76.08欧姆

当前的

IL= V.L/ XL

= 150 / 76.08

= 1.97 A.

在电气和电子电路中,术语“电抗”定期与电感器和电容器电路一起使用。这些电路中的电抗值的增加导致它们的电流降低。电感抗电抗导致电压和电流去阶段。在电力系统中,这将限制交流传输线的功率容量。虽然电流仍然在这种情况下流动,但传输线将被加热,并且没有有效的电力传输。因此,重要的是监控电路的电感电抗。电感电路的电压和电流波形之间的相位差是多少?

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