Coylton–Auchencrosh

Contents

• Overview
• Lines
• Tower forms
• Tower details

Overview

The 275 kV line from Coylton to Auchencrosh (route YY) 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 Mark Hill substation (location of the Mark Hill wind farm) the line was reconductored circa 2015–16 with Curlew (525 mm² ACCR HTLS) capable of operating at 210 °C.

Design contractor	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 (route YY). 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

See dimensions on the site guide page for a key to the table.