Implement consistent handling of admittance for bare conductors

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LineCableModels.jl/src/engine/insulationimpedance/lossless.jl

Lines 13 to 14 in 5b0d0af

	# TODO: Implement consistent handling of admittance for bare conductors
	# Issue URL: https://github.com/Electa-Git/LineCableModels.jl/issues/18

struct Lossless <: InsulationImpedanceFormulation end
get_description(::Lossless) = "Lossless insulation (ideal dielectric)"

@inline function (f::Lossless)(
	r_in::T,
	r_ex::T,
	mur_i::T,
	jω::Complex{T},
) where {T <: REALSCALAR}

	if isapprox(r_in, 0.0, atol = eps(T)) || isapprox(r_in, r_ex, atol = eps(T))
		# TODO: Implement consistent handling of admittance for bare conductors
		# Issue URL: https://github.com/Electa-Git/LineCableModels.jl/issues/18
		return zero(Complex{T})
	end

	# Constants
	mu_i = T(μ₀) * mur_i

	return Complex{T}(jω * mu_i * log(r_ex / r_in) / 2π)
end