Coylton–Auchencrosh

Contents

• Overview
• Lines
• Tower forms
• Tower details

Overview

The 275 kV line from Coylton to Auchencrosh uses a custom flat formation transmission tower type designed specifically for this line by Balfour Beatty. The line tower is similar in form to that of the much earlier L34, but the angle towers have much wider bases than those of L34. The key diagrams for the towers date back to 1992, but the overhead section of the line is said to have been constructed in 2001.

The design conductor was Rubus (500 mm² AAAC), but following increased load requirements, between Coylton and Markhill the line was reconductored circa 2015–16 with Curlew (HTLS ACCR).

Designer	Balfour Beatty
Found
Height (straight line tower)	25.2 m
Voltage	275 kV
Dates back to	1992 (drawings), 2001 (construction)
Conductors	Single
Design conductor	500 mm² AAAC (Rubus)
Design earthwire	?

Lines

This tower suite was designed specifically for the Coylton–Auchencrosh line. This line forms part of the Scotland–Northern Ireland interconnector.

Tower forms

Based on the key diagrams, none of the tower types use standard nomenclature, simply being described as “line tower”, “10 deg. angle tower” etc.

The following diagrams are shown to scale at 12 pixels per metre:

Tower details

Total width is the width between the outer phase conductor attachment points (the conventional measurement on towers). The steelwork projects a little further beyond these points.