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Long Term Development Statement for Central Networks West Long Term Development Statement
for Central Networks West

2007




C
ENTRAL
N
ETWORKS
W
EST


Long Term Development Statement


For the years 2007 to 2012



(Published November 2007)







© Central Networks West plc


















Published by:

Central Networks West plc
Registered office:
Westwood Way
Westwood Business Park
Coventry, CV4 8LG

Registered in England and Wales: 3600574



Central Networks West LTDS 2007




CENTRAL NETWORKS WEST PLC

Long Term Development Statement

For the years 2007 to 2012


This Statement, published in November 2007, is produced by Central Networks West plc
[Central Networks West] pursuant to Condition 25 of the Electricity Distribution Licence
granted to the Company.

Future loads contained in this Statement are based on previous years weather corrected
data at the time of system peak demand and modified by the Companys expectation of the
changes in demand and generation and by information given by its customers and other
users of the distribution network. Accordingly, this Statement reflects the views of the
Company and should not be taken as an indicator of the activities or prospects of individual
companies or customers.

Although all reasonable efforts have been taken to ensure the accuracy of information
provided in this Statement, the Company does not accept any liability (for the avoidance of
doubt this shall mean to include any liability under the law of contract, tort, or by reason of
breach of statutory duty, or otherwise, and this shall also mean the Company not accepting
any liability or claim for any indirect or consequential losses or damages (by which this shall
include but not be limited to loss of profit, loss of sales or turnover, loss of damage to
reputation, loss of contract, loss of customers, loss of or loss of use of any data, loss of
revenue, loss of business, loss of goodwill, loss of anticipated savings and interest and any
increased operation costs, and any increased maintenance costs)), in respect of the accuracy
or content or competency of any information contained herein, or for any delay or the non
provision of any information, and, in particular without limiting the generality of the
forgoing, neither the Company nor its directors or employees or personnel shall be under
any liability or obligation for any error or misstatement or opinion on which the recipient of
this Statement relies or seeks to rely, or by which any third party who receives or obtains this
Statement relies or seeks to rely.

No part of this Statement may be reproduced, stored in a retrieval system, transmitted or
further distributed in any form or by any means electronic, mechanical, photocopying,
recording or otherwise for any purpose other than with the written permission of the
Company.





© Central Networks West plc



Central Networks West LTDS 2007





CENTRAL NETWORKS WEST

Long Term Development Statement


Foreword


Condition 25 of the Electricity Distribution Licence held by Central Networks West plc
requires the Company, when directed by the Office of Gas and Electricity Markets Authority
(the Authority), to prepare and maintain a statement, known as the Long Term Development
Statement.

The Authority initially gave the direction on 22
nd
August 2002 and the first full issue of
Central Networks Wests Long Term Development Statement was published in November
2002. This issue is the fifth annual update of the Long Term Development Statement
published in November 2002.

The Long Term Development Statement places data about the Companys distribution
systems into the public domain to assist those who are considering the opportunities to use
these systems.

Central Networks West plc is a Distribution Network Operator (DNO) and has a distribution
business that owns and operates distribution system assets. It provides the electrical
network that distributes electrical energy to customers. Historically, the flow of power has
been from the transmission system, through the distribution system to the customer. With
increasing levels of distributed generation these flows could become bi-directional,
significantly changing the nature and function of the distribution system.

Owning and operating an electricity distribution system is effectively a monopoly business
activity and regulated accordingly. The Company is required to develop and maintain a safe,
efficient, co-ordinated and economical electricity distribution system and is responsible for:

modifying and extending the network so that new customers and additional loads or
generation can be connected
maintaining the network at safe and satisfactory conditions
repairing faults and operating the network to minimise the effects of supply
interruptions
reinforcing the network for changes in power flow
ensuring that its design philosophy, standards and practices are consistent with its
statutory and licence obligations.


Central Networks West LTDS 2007




CONTENTS

Preface
and Foreword
Refers to:
Chapter 1
Introduction


1.1
Purpose of statement

1.2 Structure
and
content

1.2.1 Structure

1.2.2 Description of contents

1.3
Data sources, confidentiality

1.4 Data
freeze
date

1.5 Company
area

1.5.1 Profile

1.5.2 Geographic indication of primary circuits
Ch.1 Fig.1
1.6
High level summary of design and operational practices for all
voltages

1.6.1 Design
practice

1.6.2 Control and operation practice

1.6.3 Standards

1.7
Major current and planned developments

1.8 Embedded
generation

1.9
Overview of interest in connections to distribution system

1.10
Commercial terms for connection

1.11
Useful documents, contacts etc.
Contacts for new and existing connections
A1
1.12
Charges for network information
A1
1.13
Form and cost of purchasing statement




Fig. 1
Small scale geographic diagram


Chapter 2
Geographic Information

2.1
Location of Companys area
A2 Fig 1
2.2 Geographic
information

2.2.1 Geographic maps
A2 Fig 2
A2 Fig 3 sheets 1 to 6
2.2.2 Substation location
A2 Table 1

Chapter 3
Distribution System

3.1
Design philosophy and standards

3.1.1 Design
philosophy

3.1.2 Standards and Engineering Recommendations
A1
3.2
Operational practice and safety

3.2.1 Operational
practice

3.2.2 Operational
safety

3.3 Primary
networks

3.3.1 Network
description

3.3.2 Design
practice

3.3.3 Standard plant and equipment
A3 Table 5


Central Networks West LTDS 2007





Chapter 3 Distribution System cont.

Refers to:

3.3.4 Operating voltages

3.3.5 Protection

3.3.6 Earthing


3.3.7 Auto-reclose

3.3.8 Constraints and restrictions

3.3.9 Load
management

3.4 11kV
networks

3.4.1 Configuration

3.4.2 Design
practice

3.4.3 Standard plant and equipment
A3 Table 5
3.4.4 Fault levels
A3 Table 4
3.4.5 Voltage
performance

3.4.6 Protection

3.4.7 Earthing

3.4.8 Auto-reclose

3.4.9 Sequence switching schemes

3.5 LV
networks

3.5.1 Configuration

3.5.2 Design
practice

3.5.3 Standard plant and equipment
A3 - Table 5
3.5.4 Fault
levels

3.5.5 Voltage
performance

3.5.6 Protection

3.5.7 Earthing

3.6
General network performance

3.6.1 Voltage
fluctuation

3.6.2 Harmonic
distortion

3.7
Schematic diagrams as at data freeze date
A3 Fig. 1 sheets 1 to 9
3.8
Substation names, codes and groups
A3 Tables 1A and 1B
3.9
Circuit parameters
A3 Table 2
3.10
Transformers
A3 Tables 3A and 3B
3.11
Circuit breaker ratings
A3 Table 4
3.12
System impedance and short circuit currents
A3 Table 4
3.13
Network Phase Arrangements

3.14 Transmission
System


Chapter 4
Demand and Generation

4.1 Total
demand

4.1.1 Historic and future demand
A4 Fig. 1
4.1.2 Daily load profiles
A4 Fig. 2
4.2
Typical load data

4.2.1
Data for typical substations
A4 Figs. 3 & 4 A4 - Table 4
A4 Figs. 5 & 6 A4 - Table 5
A4 Figs. 7 & 8 A4 - Table 6
4.3
Grid supply point demands
A4 Table 1
4.4
Primary substation demands
A4 Table 2
4.5
Distributed generation
A4 Table 3



Central Networks West LTDS 2007






Refers to:

Chapter 5
Network Development

5.1
Work carried out in previous year
A5 Table 1
5.2
Planned developments
A5 Table 2
5.3
Expected network li