ENGINEERING DESIGN STANDARD - UK Power...

Document Number: EDS 08-1101

Version: 7.0

Date: 03/12/2018

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ENGINEERING DESIGN STANDARD

EDS 08-1101

INSET NETWORKS

Network(s): EPN, LPN, SPN

Summary: This standard has been published to provide information and guidance on the application of ENA EREC G88.

Author: Stephen Cuddihey Date: 03/12/2018

Approver: Paul Williams Date: 14/12/2018

This document forms part of the Company's Integrated Business System and its requirements are mandatory throughout UK Power Networks. Departure from these requirements may only be taken with the written approval of the Director of Asset Management. If you have any queries about this document please contact the author or owner of the current version.

Circulation

UK Power Networks External

☒ Asset Management ☒ UK Power Networks Services

☒ Capital Programme ☒ Contractors

☒ Connections ☒ ICPs/IDNOs

☐ Health & Safety ☐ Meter Operators

☒ Legal ☒ G81 Website

☒ Network Operations

☐ Procurement

☒ Strategy & Regulation

☐ Technical Training

Inset Networks Document Number: EDS 08-1101

Version: 7.0

Date: 03/12/2018

© UK Power Networks 2018 All rights reserved 2 of 17

Revision Record

Version 7.0 Review Date 14/12/2023

Date 03/12/2018 Author Stephen Cuddihey

Reason for update: Periodic review

What has changed: Complete revision. Elements of the ENA CiC CoP incorporated into this document indicating minor changes (notably in section 5) pending the release of ENA EREC G88 Version 3 (expected in 2019). All document references updated accordingly.

Document renumbered from EDS 08-0113 and title amended



Reason for update: Periodic document review. Review date further extended to tie in with the revision of national standard ENA ER G88.

What has changed: Emergency trip button now refers to EDS 08-0149. Section 5.1 revised.



Temporary amendment for provision of emergency trip – awaiting outcome of ENA review & Removal of reference to EDS 08-0108.

Version 4.0 Review Date

Date 08/12/2011 Author Pete Lawson

Metering requirements amended.


Date 11/11/2010 Author Pete Lawson

Modified to include reference CCCM 1/11/2010.


Date 09/09/2010 Author B.Hoare / P.Lawson

Include revisions to G88 (2009).


Date 16/05/2006 Author Bob Bassett

First issue.


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Date: 03/12/2018


Contents

1 Introduction ............................................................................................................. 4

2 Scope ....................................................................................................................... 4

3 Glossary and Abbreviations ................................................................................... 5

4 Planning Guidance .................................................................................................. 6

4.1 Essential Information ................................................................................................. 6

4.2 Point of Supply .......................................................................................................... 6

4.3 Point of Connection ................................................................................................... 7

4.4 Point of Common Coupling ........................................................................................ 8

4.5 Contestable Work ...................................................................................................... 9

4.6 Non-Contestable Work .............................................................................................. 9

4.7 Bilateral Connection Agreement .............................................................................. 10

4.8 Minimum Cost Scheme, Apportionment and Network Optimisation ......................... 10

4.9 Network Ownership Boundary ................................................................................. 10

4.10 Boundary Metering .................................................................................................. 11

4.11 ENA EREC P2 Compliance ..................................................................................... 11

5 New Connection Requirements ............................................................................ 12

5.1 LV Connections ....................................................................................................... 12

5.1.1 LV Service Arrangement:......................................................................................... 12

5.1.2 LV Supply Interface at Fuse Cabinets, Feeder Pillars and Link Boxes ..................... 12

5.2 HV Connections ...................................................................................................... 12

5.3 EHV Connections .................................................................................................... 13

6 Building Design, Civil Works and Legal Aspects ................................................ 14

6.1 Access and Egress Arrangements ........................................................................... 14

6.2 Civil Works – Substations ........................................................................................ 14

6.3 Legal ....................................................................................................................... 14

7 References ............................................................................................................. 16

7.1 UK Power Networks Standards ............................................................................... 16

7.2 National and International Standards ....................................................................... 16

8 Dependent Documents.......................................................................................... 17


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Date: 03/12/2018


1 Introduction

This Engineering Design Standard reflects ENA EREC G88; “Principles for the Planning, Connection and Operation of Electricity Distribution Networks at the interface between Distribution Network Operators (DNOs) and Independent Distribution Network Operators (IDNOs)”.

This standard specifies the supply arrangements provided to inset networks owned by licensed distribution network operators and should be read in conjunction with the published UK Power Networks Connection Charging Statement and Methodology.

UK Power Networks has no responsibility for or jurisdiction over, the specification and design of an IDNO or License Exempt Distribution Network Operator (LEDNO) network.

2 Scope

This standard provides information and guidance on the application of ENA EREC G88 and applies to all work related to inset networks, independent distribution network operators, licence exempt distribution network operators and independent connection providers.

Inset (or embedded) networks are defined in ENA EREC G88 as:

“A Network operated by a licensed network operator within a DNO area”.

Therefore by association this standard applies to the following wishing to operate networks within the UK Power Networks licensed distribution network areas of EPN, LPN and SPN:

License exempt distribution network operators.

Independent distribution network operators.

Licenced distribution network operators.

This standard covers supplies for all voltage categories though does not provide guidance on the specific connection method required. For specific connection guidance refer to:

EDS 08-2102 – Unmetered single-phase LV supplies.

EDS 08-2101 – Metered single-phase LV supplies.

EDS 08-2100 – Metered three-phase LV supplies.

EDS 08-3100 – HV supplies with or without boundary metering.

EDS 08-4100 – EHV supplies with or without boundary metering.

EDS 08-1103 – Supplies to multi-occupied buildings and information regarding building network operators.


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3 Glossary and Abbreviations

Term Definition

BCA Bilateral Connection Agreement

CB Circuit-breaker

DNO Distribution Network Operator – Public Electricity Supply Licence holders for the original 14 UK electricity supply networks

EHV Extra High Voltage – High Voltages above 11kV used for Primary Distribution

ENA Energy Networks Association

HV High Voltage - AC Voltages above 1000V: generally refers to supplies at 6.6 or 11kV but may include supplies at higher voltages

ICP Independent Connection Provider. An ICP can undertake contestable works. An ICP is a company that has been accredited and included on the Lloyd's Register list of Contractors under the National Electricity Registration Scheme (NERS). These companies build electricity networks to the specification and quality necessary for them to be adopted (owned) by UK Power Networks or an IDNO.

IDNO Independent Distribution Network Owner

Inset Networks An electricity supply network, owned and operated by an independent licensed, or license exempt network operator, supplied at a boundary point or points from the DNO Network.

LEDNO License Exempt Distribution Network Operator

LV Low Voltage - AC Voltages between 50 and 1000V: generally refers to single or three phase supplies at 230/400V.

MPR Maximum Power Requirements

RMU Ring Main Unit


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4 Planning Guidance

4.1 Essential Information

New connections for inset networks require the same minimum information as for any new connection:

The site to be supplied, including the proposed site boundary polygon and a postal reference if available (with customer contact information).

The site MPR with significant load characteristics (for example disturbing loads).

The proposed development phasing time scales and proposed energisation date

The method of supply will be dependent upon the appropriate design standard as determined by:

EDS 08-2101 for single phase LV supplies.

EDS 08-2100 for LV Supplies.

EDS 08-3100 for HV Supplies.

EDS 08-4100 for EHV Supplies.

The point of supply will require a means of isolation to act as the distribution network boundary as specified in the appropriate design standard.

Connection charges shall be determined in accordance with the current version of UK Power Networks Connection Charge Statement and Methodology.

Where multiple points of supply are provided to an inset network, either at the IDNO’s request or as required by the minimum cost scheme; agreement shall be reached on precautions required to prevent or allow the parallel operation of incoming supplies (if conditions allow the parallel of the supply).

Where a transfer of load between points of supply is permitted this shall be clearly defined in the bilateral connection agreement..

4.2 Point of Supply

A point of supply is defined in ENA EREC G88 as:

“…A point at which the distribution network of the DNO… connects to the network of the user via the connection equipment, such point being specified in the relevant bilateral connection agreement”

Within UK Power Networks the point of supply is defined as the physical equipment interface between the inset network and the distribution network operator’s licensed distribution network. In accordance with the ESQCR regulation 6 this point of supply will take the form of a protective or isolation device through which an inset network may be isolated under fault conditions. The out-going terminals of this protective or isolation device marks the UK Power Networks boundary of ownership and will be labelled in accordance with the appropriate design standard. Unnecessary duplication of boundary equipment shall be avoided; one point of isolation provided by a single piece of UK Power networks owned equipment at the point of supply.


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4.3 Point of Connection

A point of connection is defined in ENA EREC G88 as:

“…The point on the existing DNO network to which the new assets will be connected”

Within UK Power Networks this point will vary depending upon the availability of capacity (thermal, physical and operational) within the distribution network at any given voltage. Where it is not possible to provide a point of connection at a requested voltage due to a lack of capacity, the next highest voltage available to the customer shall be used.

The point of connection will be dependent upon the appropriate design standard as determined by:

EDS 08-2000 for connections to the LV distribution network (single, three and split-phase)

EDS 08-3000 for connections to the HV distribution network (2kV, 3.3kV, 6.6kV and 11kV).

EDS 08-4000 for connections to the EHV distribution network (20kV, 22kV, 33kV, 66kV and 132kV).

Note: Connections requiring the use of the Central London 33kV distribution network shall refer to EDS 08-0150,

not EDS 08-4000.

It is possible that the point of supply and point of connection will be represented by the same position.


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The following are examples of various points of connection, providing an overview of the typical arrangements using the HV distribution network as a model.

UK Power Networks

Existing Main

X

UK Power Networks Primary Substation

POC

IDNO Site

Network Ownership Boundary

X POC

POC

Figure 4-1 – Example Point of Connection Options in Relation to a Connection Boundary

UK Power Networks Existing Main

X

UK Power Networks Primary Substation

POC

IDNO Site

Network Ownership Boundary

Figure 4-2 – Example of a Local Point of Connection

4.4 Point of Common Coupling

For the purpose of assessing disturbing loads, the point of common coupling (defined by IEC 60050 as the “point of a power supply network, electrically nearest to a particular load, at which other loads are, or may be, connected”) may be at the point of connection or at a position removed from both the point of connection and point of supply.

The point of common coupling shall be determined on a case by case basis with reference to the appropriate voltage design standard.


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4.5 Contestable Work

Contestable work is defined in the ENA CiC CoP as:

“Connection Works that are identified by a DNO in its Connection Charging Methodology as able to be carried out by an Independent Connections Provider (and 'Contestable' will be interpreted accordingly)”.

From the same document “Connection Works” are also defined as:

“…the works that are required to be undertaken to provide a Connection and includes determination of the Point of Connection”.

Within the UK Power Networks distribution network the following items are considered within the remit of contestable works and may be carried out by either UK Power Networks or an ICP at the behest of the inset network operator with the intention that the work is to be adopted by the DNO upon completion:

Design of the contestable work.

The procurement and provision of equipment and materials to UK Power Networks current specification for the contestable work (refer to EDS 08-1100 for additional information).

Trenching and other preparation of the site, including the circuit routes between the proposed inset network site and the point of connection.

Construction of the contestable work.

Recording of the work done and of the location of cable routes and other equipment on site or elsewhere (where those assets are installed by the ICP), and the provision of that information to UK Power Networks.

Reinstatement (both temporary and permanent as appropriate).

Provision for metering equipment.

Connection and energisation of extension assets or diverted assets to the HV and LV UK Power Network distribution networks (including live jointing on the LV distribution network with prior agreement).

4.6 Non-Contestable Work

Non-contestable work is defined in the ENA CiC CoP as:

“…Connection Works that are identified by a DNO in its Connection Charging Methodology and Statement that may only be carried out by the DNO (and 'Non-Contestable' will be interpreted accordingly)”.

Within the UK Power Networks distribution network the following items are considered within .the remit of non-contestable works and may be only carried out by UK Power Networks:

Processing customer applications and distribution system planning for the new connection (where self-determination of PoC is not possible).

Works related to network reinforcement (including design, planning, specification or installation), where the conditions for contestability are not met; outside provision of the point of connection to the inset network.

Works related to network diversions (including design, planning, specification or installation), where the conditions for contestability are not met; outside provision of the point of connection to the inset network.

The removal of existing UK Power Networks assets

For a full description of contestable and non-contestable works, refer to the CCCMS


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4.7 Bilateral Connection Agreement

The BCA is the binding written supply and service agreement between UK Power Networks and the inset network distribution network operator.

The BCA shall contain as a minimum:

Full site location details, including postal address and coordinate location.

Declared site MPR with significant loads.

Site responsibility schedule.

Operational contact details.

Network schematic showing the assets involved at the network boundary.

Supply Network Phasing.

Site access.

With regard to UK Power Networks shared grid and primary sites; shared access to these complex sites will not normally be granted due to legal, security and safety issues.

Shared access arrangements to other sites shall be agreed and documented by the site responsibility schedule within the BCA Networks and shall include:

Safety aspects – operational competencies, control procedures etc.

Plant specifications – including defect notification to/from IDNO/UK Power Networks.

Building design.

Access/egress.

Legal requirements.

Site specific factors.

4.8 Minimum Cost Scheme, Apportionment and Network Optimisation

The minimum cost scheme shall be determined by the appropriate voltage design connection standard.

There may be the opportunity to enhance the network within UK Power Networks in association with the connection scheme and any apportionment of cost to the IDNO being subject to and in accordance with the UK Power Networks CCCMS.

UK Power Networks shall consider any opportunity for network optimisation using the standard internal review process.

4.9 Network Ownership Boundary

The ownership boundary shall be at the outgoing terminals of the UK Power Networks asset and shall be indicated on operational diagrams.

The ICP and inset network operator shall:

Provide, install, own and maintain all the cables from the UK Power Networks point of supply.

Terminate and connect all cables within their own installation to their equipment.

UK Power Networks or suitably authorised ICP staff shall connect the terminated inset network cables to the incoming supply equipment.


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After energisation, no customer access to UK Power Networks equipment shall be provided without prior authorisation and competence.

Where possible physical separation shall be maintained between the UK Power Networks equipment and any customer owned equipment.

In both shared and separate sites, label EDS 07-0009.147 shall be displayed in respect of the network ownership boundary equipment (e.g. circuit-breaker, link box or cut-out).

The phase rotation on any inset LV network shall match the rotation on the UK Power Networks local LV distribution network. Phasing shall be recorded in the BCA.

4.10 Boundary Metering

UK Power Networks shall not install equipment at the point of supply for the purpose of metering. It is expected that inset networks shall make full metering provision within the inset network.

Where it is applicable and appropriate permanent power quality watts and VARs monitoring shall be installed at every possible point of connection in accordance with the appropriate design standard.

4.11 ENA EREC P2 Compliance

An inset network is treated as a single customer by UK Power Networks for the purposes of assessing compliance with ENA EREC P2.

Guidance Note 1 of the Distribution Code states that ENA EREC P2 does not apply to individual customers.


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5 New Connection Requirements

5.1 LV Connections

5.1.1 LV Service Arrangement:

A standard LV supply arrangement in accordance with EDS 08-2100 or EDS 08-2101 shall be provided.

Subject to appropriate competencies and written agreement the inset network operator staff may be given access to the UK Power Networks cut-out fuses/links to enable restoration of supplies in the event that a fault on the inset network causes the operation of the cut-out fuses.

If the arrangement comprising two sets of LV cut-outs in a pillar or meter box is deployed, the UK Power Networks cut-out shall contain links and IDNO cut-out fuses.

5.1.2 LV Supply Interface at Fuse Cabinets, Feeder Pillars and Link Boxes

The preferred method to connect an IDNO network at LV is by the use of a link box as the boundary isolation/protective device, this is restricted to the maximum link box rating and fuse rating available to be fitted to the link box.

An earth electrode will be required at the end of the UK Power Networks LV main e.g. at the incoming side of the link box in accordance with the appropriate earthing standard.

For all new LV network connections, UK Power Networks shall adopt and or own the link box, feeder pillar and TMFC or LV board mounted equipment including any ACB.

5.2 HV Connections

An HV supply arrangement in accordance with EDS 08-3100 shall be provided.

Shared bus section circuit-breakers shall not be used by UK Power Networks to connect customer supplies and only cable connections shall be provided.

The ICP shall have the option to design, procure and install the full RMU substation including the building/housing.

Typically the responsibility for the building/enclosure shall be accepted by the majority asset owner i.e. the distribution network operator whose assets in the particular substation represent the highest total capital installation cost. This may be agreed on a case by case basis and recorded in the BCA.

The ring switches on the RMU shall have UK Power Networks operational locks and the tee-off circuit-breaker may be covered by dual locking.

Any operations shall be in accordance with UK Power Networks distribution safety rules and to the instructions of UK Power Networks. Agreement to permit the inset network operator staff to operate the tee-off circuit-breaker shall depend upon the inset network operator staff holding appropriate UK Power Networks authorisation. The decision to enter such an agreement shall be by joint agreement with UK Power Networks and shall be formally documented in the BCA.


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Where no operational agreement is made, an emergency ‘trip only’ arrangement shall be provided at the inset network operators cost as a means to cutting off the supply as required by Regulation 12 of the Electricity at Work Regulations. The inset network operator has the option to positively opt out. Where an emergency trip is provided at an approved location this shall be in accordance with EDS 05-0002 ‘Protection and Control Schemes for Customer Demand and Generation Connections’.

Joint access to a single substation enclosure shall be the standard arrangement.

UK Power Networks would not normally need access to the transformer or LV cabinet for operational requirements but may require access to the lighting and socket outlet facilities provided by the inset network operator.

The maintenance responsibility for any UK Power Networks owned/adopted switchgear or switchboard shall remain with UK Power Networks.

The inset network operator shall be responsible for ensuring adequate system earthing arrangements, including provision of bonding to the adjacent UK Power Networks systems and neutral earthing in accordance with UK Power Networks earthing standards as appropriate. The design shall ensure touch, step and transfer voltages are within the prescribed limits, and ensure earthing components have adequate thermal rating.

5.3 EHV Connections

An EHV supply arrangement in accordance with EDS 08-4100 shall be provided.

Shared bus section circuit-breakers shall not be used by UK Power Networks to connect customer supplies and only cable connections shall be provided. The boundary switchgear located at a primary substation shall always be under the ownership and operational control of UK Power Networks.

Access for inset network operator staff to work on the inset network cable shall be subject to established third party access procedures in accordance the site responsibility schedule recorded in the BCA.

When isolation and earthing is required, this shall be carried out by the owner of the relevant asset and an appropriate safety document issued across the control boundary in accordance with UK Power Networks distribution safety rules.


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6 Building Design, Civil Works and Legal Aspects

6.1 Access and Egress Arrangements

In some instances, such as where supply is afforded from an RMU, shared access will be necessary if the inset network operator is able to operate the circuit-breaker(s) controlling its inset network.

UK Power Networks requirement for access and egress shall be included at the design stage and agreed by all relevant parties.

The owner of the building/enclosure shall hold the site duties under the ESQCR and their name and 24 hour telephone number shall be displayed on the door as the site owner; this is the only telephone number to be displayed. The name of all other owners of plant and equipment in the substation shall also be displayed on the door.

Shared access to a boundary substation will normally mean the provision of suitable dual locking facilities. Where access is required, for example in the inspection and maintenance of inset network operator owned HV switchgear, the inset network operator shall enter shared access arrangements, subject to all personnel involved having the correct competency for the task and the conditions already described. The inset network operator would be limited to essential operations within the shared space.

6.2 Civil Works – Substations

Where the majority asset owner is UK Power Networks the design and construction of the substation building or housing and bases shall be to UK Power Networks standard or approved alternative.

The Network Operator who will have responsibility for the substation building/enclosure shall ensure that adequate ventilation is provided and maintained to ensure the design rating of all the electrical equipment in the substation is safeguarded.

UK Power Networks substations require 24-hour access for personnel and plant access that can be utilised at short notice in the case of an emergency. In situations where special emergency escape is required these shall be agreed with UK Power Networks.

The normal location for a substation, whether in a separate building or integral to a customer owned building, is at ground level and shall be in accordance with the relevant civil design standard.

6.3 Legal

All necessary consents relating to the substation or switchroom shall normally be obtained by the inset network operator or ICP. However, if the substation or switchroom is to provide a strategic purpose additional to that of being a supply point for the inset network operator, for example the housing of tee-point switchgear, then UK Power Networks shall ensure that its interests are adequately protected by the agreed tenancy arrangements.

The rights for the cable route from the point of connection to UK Power Networks boundary equipment shall be obtained by UK Power Networks or by the inset network operator on behalf of UK Power Networks, as these circuits will ultimately form part its network. All easements, wayleaves or other legal agreements shall be completed to the correct UK Power Networks standard.


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In situations where it is agreed that boundary equipment can be located within an existing site occupied by UK Power Networks (e.g. a secondary or primary substation) then the terms of any existing tenancy agreement shall be consulted, as it is possible that it will preclude the granting of rights to another party without the landlord’s consent.

If the inset network operator can secure a tenancy or wayleave/easement then UK Power Networks consent cannot be reasonably withheld, although it is important that UK Power Networks moves to act as an intermediary in any such negotiations between the inset network operator and the landlord.

If such an arrangement is agreed within a primary substation, the inset network operator equipment shall be housed within a separate curtilage with independent access arrangements. The inset network operator shall negotiate with any third party landlord or owner for all necessary rights to install and maintain its cables.


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7 References

7.1 UK Power Networks Standards

EDS 05-0002 Protection and Control Schemes for Customer Demand and Generation Connections

EDS 07-0003 Enclosed Major Substation Civil Engineering Standard Specification

EDS 07-0009 Specifications for Signs and Labels for Operational Sites

EDS 08-0150 London 33kV Distribution Network Design and Customer Supplies

EDS 08-1100 Appendices to ENA EREC G81

EDS 08-1103 Multi Occupied Building Supplies

EDS 08-2000 LV Network Design

EDS 08-2100 LV Customer Supplies

EDS 08-2101 LV Customer Supplies up to 100A Single Phase

EDS 08-2102 LV Customer Unmetered Supplies

EDS 08-3000 HV Network Design

EDS 08-3100 HV Customer Demand and Generation Supplies

EDS 08-4100 EHV Customer Demand and Generation Supplies

7.2 National and International Standards

CCCMS Statement of Methodology and Charges for Connection to the Electricity Distribution Systems of Eastern Power Networks Plc, London Power Networks Plc & South Eastern Power Networks Plc

Electricity at Work Regulations

The Electricity at Work Regulations 1989 HSR25

ENA CiC CoP Energy Networks Association Competition in Connections Code of Practice

ENA EREC G88 Energy Networks Association Engineering Recommendation G88, Principles for the Planning, Connection and Operation ff Electricity Distribution Networks at the Interface Between Distribution Network Operators and Independent Distribution Network Operators

ENA EREC P2 Energy Networks Association Engineering Recommendation P2 Security of Supply

ESQCR Electricity Safety, Quality and Continuity Regulations 2002

IEC 60050 International Electrotechnical Vocabulary


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8 Dependent Documents

The documents below are dependent on the content of this document and may be affected by any changes.

CON 08 114 ICP Design Fast-track and Approved Designer Scheme

CON 08 116 ICP Self-Determination of Point of Connection

DSR 01 014 Excavating near Electricity Cables

EAS 07-0021 Signs and Labels for Operational Sites and Equipment

EDS 05-0002 Protection and Control Schemes for Customer Demand and Generation Connections

EDS 06-0012 Earthing Design Criteria, Data and Calculations

EDS 07-0009 Specification for Signs and Labels for Operational Sites

EDS 07-0020 Civil Requirements for New Customer Supplies and Generation Connections

EDS 07-3101 Pre-design Requirements for Secondary Substations

EDS 08-0115 Guidance on the Application of ENA ER P2-6 Security of Supply

EDS 08-0148 Appendices to ENA ER G81Secondary Substation Earthing Design

EDS 08-0150 London 33kV Distribution Network Design and Customer Supplies

EDS 08-2000 LV Network Design

EDS 08-2100 LV Customer Supplies

EDS 08-2101 LV Customer Supplies up to 100A Single Phase

EDS 08-3000 HV Network Design

EDS 08-3100 HV Customer Demand and Generation Supplies

EDS 08-4000 EHV Network Design

EDS 08-4100 EHV Customer Demand and Generation Supplies

EDS 08-5050 Electric Vehicle Connections

LV Operations Handbook 2018

NOP 90 062 Control Engineer 11kV Training Modules (Combined)

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