GMR of Two-Layer ACSR Calculator

Two-Layer ACSR GMR Calculator

Calculate the effective Geometric Mean Radius (GMR) for a two-layer ACSR conductor bundle.
For a single conductor, \(GMR = 0.7788\,r\). For a bundle with one inner conductor and \(n\) outer strands, \[ GMR = \Bigl(0.7788\,r\,R^n\Bigr)^{\frac{1}{n+1}} \]

* Enter the conductor radius (m), the number of outer strands, and (if applicable) the outer strand spacing (m).

Step 1: Enter Parameters

Example: 0.01 m

Example: 6 (for a typical 7-strand ACSR)

Distance from inner conductor center to outer strand centers

Derived Formulas:
For a single conductor: \( GMR = 0.7788\,r \)
For a two-layer bundle: \( GMR = \Bigl(0.7788\,r\,R^n\Bigr)^{\frac{1}{n+1}} \)


Example:
For a 7-strand ACSR (1 inner and 6 outer) with \(r = 0.01\,\text{m}\) and \(R = 0.05\,\text{m}\):
\( GMR = \Bigl(0.7788\times0.01\times(0.05)^6\Bigr)^{\frac{1}{7}} \) m.