Western Link HVDCOrestes Macchione – Business Development Manager

§ August-2018§ Page 2 § Energy Management / Transmission Solutions

Western HVDC LinkProject Overview

Birmingham

London

Edinburgh

Douglas

Cardiff

Manchester

Glasgow

Flintshire

Hunterston

§ Customer: NGET/SPT Upgrades Ltd.§ Design: HVDC Classic Transmission Link.§ Rating: 2,200 MW / 6 hours: 2,400 MW.§ Voltage: 600kV DC / 400kV AC.§ Length: 260 miles DC cable§ Key Facts:

- Largest ever Contract awarded by NG/SP.- Highest ever Rating for a Cable Scheme.- Highest ever Voltage for a Cable Scheme.- First time HVDC technology is used as an

integral part of the GB Transmission System.- More than 3,500,000 hours worked without a

lost-time

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Western HVDC LinkProject Overview

§ Project consistent with obtaining 30% UKElectricity from renewables by 2020 andcutting emissions 57% by 2030.

§ Existing AC links close to full capacity.Already enhanced with compensation.

§ Bi-directional, securing energy in Scotland.

AC North – SouthCorridors

20 miles240 miles

2 miles

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Western HVDC LinkScope of Works

§ Turnkey Solution

§ Overall System Design & Studies

§ Engineering, manufacturing and Supply of Converter Stationcomponents, including Transformers, Thyristor Valves, Controls, CoolingSystem, Smoothing Reactors, Shunt Reactors, DC switchgear andancillary equipment.

§ 400kV AC Filters, Switchgear (GIS / AIS) and Protection associated withnew converter stations, including building / enclosures at Hunterston.

§ 400kV AC cable between Converter and Connecting Substations.

§ SVC Plus at Hunterston in the range of +/-250 Mvar.

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Western HVDC LinkOverall Link Design

Converter Bipole design / two dc cables

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Western HVDC LinkReactive Power / AC Filter Design

TT7/13/24

120 MVAr

Pole 2

CommonReactive Power

TT5/11/38

120 MVAr

TT3/11/13

240 MVAr

TT3/11/13

240 MVAr

ST46

240 MVAr

SVC Plus2 x ±125MVAr

TT7/13/24

120 MVAr

TT5/11/38

120 MVAr

TT3/11/13

240 MVAr

TT3/11/13

240 MVAr

ST46

240 MVAr

Shunt Reactor200 MVAr

Pole 1

Pole 1400kV AC Bus

Pole 2400kV AC Bus

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Western HVDC LinkHunterston - Site Location

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Western HVDC LinkHunterston Site

HunterstonConverter Station

Hunterston EastConnecting Station

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Western HVDC LinkLayout – Plan View Hunterston

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Western HVDC LinkLayout – Plan View Hunterston

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Western HVDC LinkLayout – 3D View Hunterston

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Western HVDC LinkLayout – 3D View Hunterston

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Western HVDC LinkHunterston - Site Views

Hunterston Converter Station

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Western HVDC LinkConverter Hall - Hunterston

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Western HVDC LinkConverter Hall - Hunterston

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Western HVDC LinkFilter Hall - Hunterston

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Western HVDC LinkFlintshire Site

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Thank You

Orestes MacchioneBusiness Development Manager

4601 Six Forks RdRaleigh, NC 27609

Mobile: +1 (919) 793 8685E-mail: orestes.macchione@siemens.com

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