What is GMR geometric mean radius?

Geometrical Mean Radius GMR is basically the Geometric Mean of distances between the strands of a conductor. It is the fictitious radius of conductor having no internal flux linkage but only external flux linkage.

Is geometric mean distance GMD the same as geometric mean radius GMR?

The inductance of the conductor y can also be similarly obtained. The geometric mean radius GMRy will be different for this conductor. However the geometric mean distance will remain the same.

What is effective radius in transmission line?

Configuration of transmission lines The effective radius (r’) of each conductor is calculated by: = 0.7788 = 0.7788 ….” = 0.01377 (2)

What is bundling of conductors?

Bundled conductor are those conductors which form from two or more stranded conductors, bundled together to get more current carrying capacity. By using bundle conductors instead of the single conductor in the transmission line increases the GMR of the conductors.

How is the concept of GMD and GMR used?

This concept is very useful in Power System for the calculation of Inductance and Capacitance of Transmission Line. The same concept is also used for the calculation of GMD and GMR.

What does GMD stand for in power system?

GMD stands for Geometrical Mean Distance. It is the equivalent distance between conductors. GMD comes into picture when there are two or more conductors per phase used as in bundled conductors. GMR stands for Geometric mean Radius.

How is the geometrical mean radius ( GMR ) related to inductance?

The Geometrical Mean Radius GMR of conductor is taken in such a way that inductance of conductor due to external flux linking becomes equal to the original inductance LA. This means Thus Geometric Mean Radius GMR of a conductor is that fictitious radius which do not has any internal flux linkage but only have external flux linkage.

How to calculate GMD and GMR for conductors?

Now, we will calculate the GMD and GMR for the configuration of the conductors shown in figure above. For getting the GMD, first we need to calculate the distance between the strands of Go and Return conductors. D12 = Distance between the 1ststrand of Go and 2nd strand of Return conductor