Online direct wire inductance calculation

Inductance is the property of an electrical circuit to accumulate energy in a magnetic field. As a result, reactive (useless) power is consumed, so power lines are loaded and heated. Also, its high values ​​lead to the formation of strong arcs, improper operation of switching equipment and a decrease in performance when the load is disconnected with semiconductor switches.

This phenomenon is observed mainly in conductors wound into a coil; in a direct wire, the inductance value is several times smaller, and it is distributed along its length. This is due to the fact that in the coils the magnetic field of each of the turns is added together.

The formula for calculating the inductance of a straight wire includes its length and diameter, to find out how to calculate take a look at it:

L = 0.00508 * a * (log * (2 * a / d) - 0.75)

Here: a is the length, d is the diameter.

But calculating the logarithm can be inconvenient, so use our online calculator to calculate the inductance of a straight wire. You just need to enter its diameter and length, and you will immediately get the result. This information will allow you to find out the approximate currents of short circuits of the electric line and the speed of the complete disconnection of the circuit by switching devices, and they will also help in the calculation of snubber circuits for thyristors or transistors.

Length (a): cm
Diameter (d): cm
Inductance (L): nGn

The result is given in nano Henry (nH or 10 ^ (- 9) Hn).

The online calculator provides data only for a straight wire, to calculate the inductance of the coil, you need to use other rules and take into account more factors, such as, for example, the magnetic permeability of the core.

(2 votes)


  • Yuri

    The inductance of 1 m in diameter of 1 cm is approximately equal to 1 μH!

    To answer
  • Igor

    The calculator does not work with cable diameters less than 1 cm.

    To answer

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