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Method Statement Esprit Control

Equipment - Ground Mounted LV

Substations

Prepared for: SSEPD

Project No: 86000

Document Version: 2.0.6

Date: 12 Oct 2015

Private and confidential

Method Statement Esprit Control Equipment - Ground Mounted LV Substations

86000 - 2.0.6

CONFIDENTIAL - This document may not be disclosed to any person other than the addressee or any duly authorised person

within the addressee's company or organisation and may only be disclosed so far as is strictly necessary for the proper

purposes of the addressee which may be limited by contract. Any person to whom the document or any part of it is disclosed

must comply with this notice. A failure to comply with it may result in loss or damage to EA Technology Ltd or to others with

whom it may have contracted and the addressee will be held fully liable therefor.

Care has been taken in the preparation of this Report, but all advice, analysis, calculations, information, forecasts and

recommendations are supplied for the assistance of the relevant client and are not to be relied on as authoritative or as in

substitution for the exercise of judgement by that client or any other reader. EA Technology Ltd. nor any of its personnel

engaged in the preparation of this Report shall have any liability whatsoever for any direct or consequential loss arising from

use of this Report or its contents and give no warranty or representation (express or implied) as to the quality or fitness for

the purpose of any process, material, product or system referred to in the report.

All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means electronic,

mechanical, photocopied, recorded or otherwise, or stored in any retrieval system of any nature without the written

permission of the copyright holder.

© EA Technology Ltd May 2015

EA Technology Limited, Capenhurst Technology Park, Capenhurst, Chester, CH1 6ES;

Tel: 0151 339 4181 Fax: 0151 347 2404

http://www.eatechnology.com

Registered in England number 2566313

Version History

Date Version Author(s) Notes

15/10/2013 1.0 Mary Gillie Original Version

15/05/2015 2.0 Andrew Moon Section 11added on decommissioning

and removal.

Final Approval

Approval Type Date Version EA Technology Issue Authority



86000 - 2.0.6

P:\Projects\Project Numbers 86000 - 86990\04 Working\04 Tier 2 Project\04 Cluster Installation\02 Installation

Documents\01 Method Statements\02 - MC\Esprit Installation GMT Method Statment v 2.0.8.docx

14 May 2015 Page ii

Contents

Version History .............................................................................................................................................................................. i

Final Approval ................................................................................................................................................................................ i

Contents ........................................................................................................................................................................................... ii

1. Background ...................................................................................................................................................................... 1

2. Introduction ..................................................................................................................................................................... 1

3. Management of safety ............................................................................................................................................... 1

4. Installation ....................................................................................................................................................................... 2

4.1 General requirements for installation .............................................................................. 2

4.2 Order of installation .......................................................................................................... 2

4.3 Detailed visual inspection ................................................................................................. 3

4.4 On-site civil installation works .......................................................................................... 3

4.5 PLC injection point, Esprit power supply installation ..................................................... 5 4.5.1 PLC injection point, Esprit power supply (general). ............................................ 5 4.5.2 PLC injection points installation at enclosed LV fuse boards or cabinets ......... 6 4.5.3 Installation of PLC injection points at an ”open” board ...................................... 8

4.6 Installation of Rogowski coils ......................................................................................... 11 4.6.1 Current measurement connection and routing from the Power Cable Chamber

to the [Eldon (Esprit + Envoy) cabinet] ............................................................... 12 4.6.2 Rogowski coils installation instruction at an “Open” Board .............................. 13

5. Commissioning .............................................................................................................................................................. 1

6. Esprit removal at ground mounted substations ....................................................................................... 2

6.1 General requirements for removal ................................................................................... 2

6.2 Decommissioning .............................................................................................................. 2 6.2.1 Order of removal .................................................................................................... 3 6.2.2 Removal of Rogowski coils and Current Transformers ....................................... 3 6.2.3 Removal of monitor controller and Rail 350 enclosures .................................... 4 6.2.4 Removal of PLC injection points .......................... Error! Bookmark not defined. 6.2.5 Enclosed LV fuse Boards or cabinets .................................................................... 6 6.2.6 Open LV fuse boards or cabinets.......................................................................... 9 6.2.7 Removal of cable routes and ducting ................................................................. 10

6.3 Site inspection .................................................................................................................. 11

Appendix I Ten47 Mini G Clamp and Narrow G Clamp Specification ................................................... 12

Appendix II Esprit Monitor Controller ....................................................................................................... 13

Our Expertise ................................................................................................................................................................................. 2



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1. Background

This method statement, which responds to the requirements set out by Scottish and Southern Energy

Power Distribution (SSEPD) and EA Technology Limited, has been prepared by EA Technology

Limited, to provide the instructions that should be followed in order to connect Esprit control and

monitoring equipment at ground mounted LV substations.

Note: This method statement is solely for use for ground mounted LV substations where the LV and

HV earths are connected.

2. Introduction

This method statement defines the principles that should be followed in order to connect Esprit

equipment.

All equipment should be installed DEAD when possible and LIVE only when it is safe to do so and if

justified by a written risk assessment.

Where it is possible to install this type of equipment DEAD, whilst maintaining supplies to customers

connected to the network to be controlled, this option must be taken. However, it is recognised that

in many cases it will be impractical to make the distribution transformer, the LV pillar or cabinet

DEAD and therefore the guidance within this work instruction must be followed. In order to minimise

time working on a LIVE system, Esprit equipment connection to the energised part of the network

should be carried out last.

Where appropriate, instruction for the installation of equipment will be specific to the chosen

location. The following generic instructions regarding installation will generally apply

3. Management of safety

The following requirements will be complied with at all times throughout the installation process.

1. Safety rules and other procedures must be followed whilst undertaking work in accordance

with this work instruction. The following documents are particularly relevant and must be

adhered to at all times:

a. Safety precautions and procedures applicable to low voltage systems as detailed in

section 8 of the Operational Safety rules.

b. When work is to be undertaken in proximity to live LV conductors it is necessary to justify

this decision. A risk assessment complying with PR-PS-421, Justification for Live Low

Voltage Working is therefore required.

2. Prior to commencing work a full assessment of risk will be undertaken in accordance with

SSE Injury Prevention Process. This will include a stage one assessment in advance of work

commencing and a stage two on site assessment which shall be undertaken prior to work

commencing. This assessment must be agreed by all members of the working party and

signed off accordingly.

3. The working party will consist of at least two persons who will be appropriately authorised

to undertake the proposed installation work in accordance with SSE Operational Safety Rules.

4. System control will be advised prior to work starting and upon completion of the work.

5. Personal Protective Equipment will be worn in accordance with SSE PPE matrix (see S&E

Manual Section 1, Appendix 1 of WI-HSE-001).



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4. Installation

4.1 General requirements for installation

This method statement provides details regarding how to install Esprit equipment safely in ground

mounted distribution substations. It focuses on the methods to be followed in order to make the

necessary current connections and Power Line Communication (PLC) injection points. The PLC

injection points also provide the source of power supply for the Esprit control electronics, and for

the trial, the data logging / monitoring electronics. This method statement provides guidance

regarding the provision of suitable enclosures and the positioning of Esprit equipment within

distribution substation.

The below installation instructions shall be followed. Some site specific modifications may be

required.

1.1. Esprit equipment, specifically the Esprit monitor controller, will always be installed in

accordance with manufacturer’s instructions (See I2EV Esprit Monitor Controller

Installation Guide). It will be contained in its own enclosure using a [Eldon (Esprit + Envoy)

cabinet] with typical dimensions 600h x 400w x 200d which will also enclose the Envoy

communications unit.

1.2. Specific upstream system communication requirements are not covered within this method

statement.

1.3. Current References – All 3 phase (no neutral) current values will be obtained by using fully

insulated sensing transducers (Rogowski coils). The sensors will be installed around the

cable connections at suitable locations as close as practically possible to the Esprit control

cabinet.

1.4. Where a generic installation instruction is to be followed, a full assessment of options for

the connection of current sensors will be made prior to any work commencing.

1.5. Prior to work commencing, a visual inspection of the connection points will be carried out

with particular attention being made to positions where current sensors and PLC injection

plugs are to be installed. If there is any doubt regarding the condition of the connection

point, work shall not commence and the issue shall be referred to the person responsible

for instructing the installation.

1.6. Some LV pillars may contain asbestos; these are indicated with an ‘A’ on the outside of the

pillar. On the first door to open, a photograph is fitted showing the location of the

asbestos containing materials (ACMs). Providing these materials are not displaced during

the installation work then the cabinet is safe to work on. If it is necessary to displace the

ACMs then work will not commence until the ACMs have been safely removed.

4.2 Order of installation

The exact arrangements for installation will depend on the site. A site survey will be required in

each case to finalise arrangements. The order of installation and connections will be the same in

each case:

1. Detailed visual Inspection

2. Any civil work required

3. Cable routes and ducting prepared and installed

4. PLC injection/power supply connections made through to a commando socket

5. Connection of Rogowski coils to cables and Esprit Unit

6. Esprit unit commando plug connected to PLC injection/power supply socket (of 3)



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The work required for each of the steps and the options available are described in the next

sections.

The order that the cables should be connected is set out in detail in the following Sections54.5 to

4.6 but can be summarised as follows.

1. Connect the earth to the [Eldon (Esprit + Envoy) cabinet].

2. Connect the PLC injection supply cable terminating with the commando connection socket

for the [Eldon (Esprit + Envoy) cabinet], and with the cable routed through protective

ducting if required. Connect the neutral first, then the three phases. Do not connect to the

Esprit equipment until all 3 phases are connected.

3. Rogowski coils are to be installed starting with the rearmost / furthest from the front of the

board connected first (as per section 4.6.2).

4. Rogowski coil are to be made off to the [Eldon (Esprit + Envoy) cabinet].

5. Connect the PLC injection supply commando plug and socket.

4.3 Detailed visual inspection

In addition to the requirements detailed in Sections 3 (Management of safety) and 4 (Installation

General requirements for installation) a visual inspection shall be carried out:

1. A detailed visual inspection shall include:

All parts of the [Eldon (Esprit + Envoy) cabinet] or other point of measurement / supply

including checks for damage to insulation, overheating (present and historic).

Cables and connection methods; this shall include the inspection of all cable cores to

identify any damage/ breakdown of insulation and overheating issues.

Inspection of abnormal connections.

2. Where an unsafe situation is identified all work on site will cease and appropriate repairs

will be instigated. No Esprit equipment will be installed until repairs have been completed

and any unsafe situation has been rectified.

3. Wherever possible the [Eldon (Esprit + Envoy) cabinet] will be fixed in its permanent

position before installation of the associated connections commences.

Care should be taken to ensure that any equipment installed will not interfere with or prevent the

safe operation of any equipment located in the substation and the possibility of damage to the

insulation is minimised.

4.4 On-site civil installation works

1. Check on the equipment labelling that the equipment ([Eldon (Esprit + Envoy) cabinet],

Rogowski coils, PLC plugs).

2. For ground mounted substations the [Eldon (Esprit + Envoy) cabinet] shall be positioned

such that the distance between the Rogowski coils and the [Eldon (Esprit + Envoy) cabinet]

is minimized.

3. Position of [Eldon (Esprit + Envoy) cabinet] – to ensure that no trip hazard is introduced the

[Eldon (Esprit + Envoy) cabinet] should be placed at a suitable location within the substation

and securely fixed to a wall, existing assets, or if these options are not possible to the floor

via a paving slab. If secured to the floor it should be in a position that does not impede

operational tasks and does not pose a trip hazard. The actual location will be dependent

upon the type and size of substation.



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4. If there is any history of a substation flooding and the [Eldon (Esprit + Envoy) cabinet]

cannot be mounted high enough on a wall, then a Uni-Strut frame with “Flexi feet” will be

used to raise the [Eldon (Esprit + Envoy) cabinet] off the ground (Figure 1).

Figure 1. Example of Uni-Strut frame used to raise equipment above flooding level.

5. Where the [Eldon (Esprit + Envoy) cabinet] is mounted on a soft grounding (soil, shingle,

grass etc.) a hand dug excavation shall be carried out in order to provide an access route

for the monitoring cables and power supply connection. Wherever possible these should

exit beneath the right hand side of the LV pillar, where the power connections will be

made. However, if this is not possible a left hand exit may be used.

6. All cables (power supply, current measuring etc.) exiting the equipment will be protected

using suitable flexible ducting or conduits or other similar materials.

It is important that the cable access route shall be installed at a practical position, where it

must not obstruct or affect the operation of doors or interfere with the general operational

requirements of the pillar and its function.

7. In the unusual circumstances that, a communications antennae outside of an indoor

substation is required, ensure a suitable entry point for the connecting cable. That is, a point

that does not severely affect the fabric of the building and allows positioning of an antennae

in a location that minimises cable runs and the possibility of theft. Care should be taken to

install the antenna safely on the outside of the building, and sufficiently high to ensure good

reception. The permission of the building owner (typically SSEPD but not always) must be

sought first before creating a cable entry point or attaching an external antenna.



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4.5 PLC injection point, Esprit power supply installation

Reminder - This is a Live Network, appropriate PPE must be worn at all times and only approved

insulated tools shall be used!

Note: This arrangement can only be used where the site already has a bond between the LV and HV

earth systems.

4.5.1 PLC injection point, Esprit power supply (general).

Wherever possible existing voltage reference connections to the LV substation bus bars will be used

as PLC injection points (these also provide the power supply for the equipment electronics). If this

is not practicable or such connections do not exist other techniques will be applied using equipment

and procedures described below. In all cases, the connecting leads will be fused with a 2A fuse to

prevent any failure of the new equipment affecting existing supplies. The fuse will be connected as

near to the voltage connection as practicable.

The Esprit control equipment requires PLC injection points one per phase and neutral (3P+N)

connection. All connection points should be connected before the commando socket is connected

to the Esprit equipment. Where the earth from the commando socket is not wired to the neutral

connection it should be bolted, screwed or compression fitted to the substation earth.

An earth connection from the substation earth to the equipment cabinet [Eldon (Esprit + Envoy)

cabinet] is to be built in. A minimum 4mm2

earth connection shall be made to the substation earth,

and to the terminal provided for this purpose in the [Eldon (Esprit + Envoy) cabinet]. Earth

connections are to be bolted, screwed or compression fitted to achieve a permanent connection.

Due to the nature of this connection type, it must be made outside of the LV cabinet or pillar.

The Esprit monitor controller power supply and PLC injection points are combined (Figure 2).

Figure 2. Schematic diagram representing [Eldon (Esprit + Envoy) cabinet] connection to the GMT.



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4.5.2 PLC injection points installation at enclosed LV fuse boards or cabinets

Open the LV Pillar and ensure all terminals are shielded by approved insulated sheets including spare

fuse ways (Figure 3).

Figure 3. Standalone enclosed outdoor LV pillar.

Identify the voltage reference point. Remove the LV fuses from the test/terminal block. These are

normally of the screw-in type located in the centre of the test/terminal block (Figure 4).

Figure 4. Test terminal block

Fuses



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The PLC injection cables are to be routed from the test/terminal block to the [Eldon (Esprit + Envoy)

cabinet] overall enclosure via a designated route through the LV Pillar. The designated route is

beneath the 13A power socket, onto the right hand front edge of the cabinet, and then down this

front edge to the vermin guard (Figure 5). Plastic trunking (no wider than 15mm) is to be stuck onto

this front edge over its full length. The vermin guard is to be unbolted and removed (two bolts); it

can then be cut or drilled away from the cabinet, to create a hole in line with the bottom of the

trunking, and then reinstalled. This will allow the cables to emerge into power cable chamber (Figure

5).

Figure 5. PLC cable route through LV Pillar.



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Remove the LV Pillar power cable chamber inspection plate and close the cabinet door (Figure 6).

Figure 6. LV Pillar Power Cable Chamber.

Install 4 (3phase + 1Neutral) of double insulated 2.5mm single core conductors from voltage

reference terminals (bus bar side) through to the power cable chamber (Figure 7). The 4mm sockets

may be used to make connections at the test/terminal block.

Figure 7. Power Cable Chamber PLC cables routing

4.5.3 Installation of PLC injection points at an ”open” board

Care must be taken to ensure that installation of the Esprit monitor controller and associated

equipment and connections does not introduce additional hazards or interfere with the general

operational requirements of the fuse board and its function.

A voltage connection kit will comprise of the following components (Figure 8):

Insulated G-Clamps - specially designed to provide a connection to open fuse boards.

Cable for connection to the G-Clamp – made using fully shrouded 4mm recessed

connections in order to remove the possibility of accidental contact with other metallic

surfaces when the plug is inserted into the insulated G-Clamp.

Fused phase leads - double insulated to provide adequate levels of safety, fused as close as

reasonably practicable to the connector. Leads are identified L1, L3, L3 or coloured using

standard phase colour (brown, black, grey).



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Neutral leads - double insulated to provide adequate levels of safety. Leads are identified N

or coloured blue.

Earth leads - double insulated to provide adequate levels of safety, not fused. Leads are

identified E or coloured green/yellow.

PVC Spiral cable wrap – for securing / looming all above cables/conductors.

Cable tie wraps.

Figure 8. Example of the LV busbar connection point using G-Clamp.

Upon satisfactory establishment of the cable access route the fuse board can be prepared for

installation of the PLC injection point and the Esprit monitor controller power supply. This can be

installed as follows:

Identify locations within the fuseboard where the phase, neutral and earth connections will

be made off using insulated G-Clamps. The preferred connection point is the expansion /

bus bar extension bushings which in most cases are located at the right hand side of the

fuseboard;

Should this point not be available, the insulated G-Clamps can be installed at any other

identified suitable busbar location (where the installation does not restrict or interfere with

normal operation of the equipment);

In all cases the connection shall be made to busbars or the busbar side of any conductors /

contact chosen (not on the outgoing side of feeder’s i.e. fuse carrier pins/ contacts of

outgoing circuits etc.);

The conducting material at all connection point locations shall be prepared by scratching the

oxidized covering from the conductor using a fully insulated tool (normally a screwdriver) in order

to ensure a sound electrical connection (Figure 9).

Figure 9 Example of oxidized conducting material.



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The main earth connection shall be made first as follows:

Earth connections are to be bolted, screwed or compression fitted to achieve a permanent

connection. Due to the nature of this connection type, it must be made outside of the LV cabinet or

pillar.

If an external earth connection is not available, the main earth termination shall be made using an

insulated G-Clamp instead. The G-Clamp will be connected to main earth conductor/bar which is

normally located at the bottom of the fuseboard (Figure 10).

Figure 10 Main earth termination made with a G-Clamp

The surface of the earth bar will be prepared using an insulated tool as described above. The G-

Clamp shall be positioned on the earth bar to avoid direct interference with existing lugs/nuts/bolts

and hand tightened approximately one full turn from point of contact.

Note – do not use any tool to tighten the G-Clamp.

A notice must be fixed at the point of earth connection to advise any person carrying out work in

the future that an earth contact should not be disconnected (Figure 11).

ESPRIT EQUIPMENT

Earth connection DO NOT DISCONNECT

Figure 11 Example of the warning notice for Esprit earth connection.



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Insulated G-Clamps can now be installed for the power supply phases and neutral connection. G-

Clamps shall be positioned on neutral and phase busbars to avoid direct interference with existing

lugs/nuts/bolts and hand tightened approximately one full turn from point of contact. Note – do

not use any tool to tighten the G-Clamp.

Figure 12 Fuse board with G-Clips installed

Run the power supply leads into the LV pillar / fuseboard using the access created as detailed above

in section 4.3. Where necessary, cable ties and suitable flexible conduits should be used to ensure

a tidy installation is achieved. The installation of the power supply / PLC injection points can be

completed by connecting the leads via the insulated connectors to the G-Clamps. The leads shall be

installed in the following sequence; earth, neutral, phase 1, phase 2, phase 3.

4.6 Installation of Rogowski coils

There is no set arrangement for connection of the Rogowski coils and therefore great caution should

be taken when installing these cables.

Install and secure the coil (1 per phase) in position making sure that the arrows on the coil are

pointing in the direction that the load is flowing away from the LV busbars for outgoing cables as

per the manufacturer’s instructions.

Once installed, position all coil / transducer cables in their final location – in line with manufacturer’s

instructions.

Run all cables through the pre- prepared cable access route / duct and terminate within the [Eldon

(Esprit + Envoy) cabinet] (see next section).

Coils are to be positioned so as not to block the removal or replacement of cable fuse-links, minimise

strain on connections, and to avoid locations where cables could be abraided or otherwise damaged.

If installed around cable crutches etc., the cable must first be inspected to confirm its integrity and

stability.

Cable cores may only be flexed or moved using very gentle force, and connections at the points

where the cable cores are made off should be inspected afterwards to ensure that cable remains

intact and correctly fixed.



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4.6.1 Current measurement connection and routing from the Power Cable Chamber to the

[Eldon (Esprit + Envoy) cabinet]

All measurement cables are to be routed out of the power cable chamber through the lower vermin

guard. This should be unbolted, removed, cut away from the cabinet and replaced with the cables

inserted in the cut out section. Note that the cut out should be no larger than the area required for

the cables to avoid compromising the integrity of the vermin guard.

All cables should be installed in suitable plastic conduit between the LV pillar and the [Eldon (Esprit

+ Envoy) cabinet], and routed away from the areas where access is required for the replacement of

power fuses or HV, LV switching. Where possible, the conduit should be hand dug in to run beneath

the shingle so that there is no surface trip hazard. Use of flexible secured ducting may be

appropriate.

In some situations the LV pillar may be placed directly over a concrete trench where there would be

no access for the measurement cables through the bottom vermin guard. Where this is the case, it

will be necessary to form a hole on the side panel of the cable chamber. In this case, mark the centre

point for the 60mm steel hole punch ensuring the hole will not conflict with the auxiliary power

terminals and will leave enough space for shielding the installed cables. Note – the supplies to the

auxiliary terminal block will be isolated by removing the fuses located behind the maximum demand

indicator assembly.

Install paxolin shielding to protect cables from risk of pilot drill on penetration (Figure 13). Carefully

drill the pillar hole (from inside the pillar if possible) ensuring there is a second person watching the

pilot drill for any error in judgement.

This will be a 2 person task, the shielding must be held in place by a suitably authorised

operative.

Figure 13. Paxolin shielding to protect cables



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Once pilot drilled set up the punch and form the hole to suit the proposed duct gland. All bare metal

surfaces are to be treated with a zinc rich aerosol spray (e.g. Galv Cote, SEPD Commodity Code

110063). Install the duct gland (Figure 14).

Figure 14 Hole for Esprit control cables.

Measurement cables should be marshalled and have identification tags fitted at each end so that

any subsequent equipment disconnections and reconnections can be established with confidence

and a minimum of re-commissioning activities.

Terminate all measurement Cables in the appropriate Esprit monitor controller connection terminals.

Carry out any configuration of the Esprit monitor controller in accordance with the manufacturer’s

instructions prior to energising.

Completion

Ensure that all connections at the Esprit monitor controller and PLC connection socket are secure.

Ensure that the [Eldon (Esprit + Envoy) cabinet] is permanently fixed in its final location and that all

cables are secured along the length by means of cable ties (inside the pillar) and flexible conduit

(outside the pillar) with identification tags fitted to all cables.

4.6.2 Rogowski coils installation instruction at an “Open” Board

Care must be taken to ensure that installation of the Esprit monitor controller and associated

equipment and connections does not introduce additional hazards or interfere with the general

operational requirements of the fuse board and its function.

Upon the completion of PLC injection points connections the board can be prepared for installation

of the current sensing coils as follows:

Highlight the cables and conductors that require to be monitored as per the written work instruction.

Starting with the rear conductor, or the furthest from the front of the board, install and secure the

coil / transducer in position making sure that the arrows on the coil are pointing in the direction

that the load is flowing as per the manufacturer’s instructions. Install the remaining coils /

transducers working from the back towards the front (Figure 15).

Once installed, position all coil / transducer cables in their final location – in line with manufacturer’s

instructions.

Run all cables through the pre- prepared cable access route / duct and terminate within the [Eldon

(Esprit + Envoy) cabinet].



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Figure 15 Fuse board with installed Rogowski coils.

Completion

Ensure that all connections at the Esprit monitor controller and PLC connection sockets are secure.

Ensure that the [Eldon (Esprit + Envoy) cabinet] (in its enclosure is permanently fixed in its final

location and that all cables are secured along the length by means of cable ties (inside the pillar)

and flexible conduit (outside the pillar) with identification tags fitted to all cables.

Rogowski

coil



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5. Commissioning

On completion of the installation of Esprit equipment a label will be fitted to the cabinet or pillar.

This will state as a minimum:

The fact that Esprit equipment has been fitted;

The owner of the equipment

Contact information in the event of queries (typically department or function name)

Instructions in case of the unit failing

Specific information that other working parties would reasonably expect to know without

contacting the owner.

Commissioning of the Esprit equipment shall be in accordance with the manufacturer’s instructions.

The installer will ensure that the SSEPD network information systems (GIS and PLACAR) are updated

appropriately to record the installation of the monitoring equipment and any modifications made to

the pillar or cabinet.

A record shall be kept for all aspects of commissioning.



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6. Esprit removal at ground mounted substations

6.1 General requirements for removal

Before reading through this section on decommissioning, persons carrying out the decommissioning

must read and understand Section 3 – The Management of Safety, within this document.

Decommissioning persons must adhere to these safety instructions at all times. The

decommissioning work will require live working and therefore must be carried out by either SSEPD

staff or 3rd

party contractors who are authorised for live working.

Suitable safety gear and insulated tools must be used, these must include:

An Inner layer of live working gloves consisting of insulating material (EN60903 Class 0 or

above)

Over gloves capable of providing mechanical protection (compliant with EN388).

A Class 0 Arc Flash safety helmet with safety shield, compliant with the following standards

o EN397:2012 – Industrial Safety Helmets

o EN50365: 2002 - Electrically insulating helmets for use on low voltage installations

o EN166: 2001 – European Standards and Markings for Eye and Face Protection

Arc Flash Protective Coveralls, compliant with the following standards:

o BS EN ISO 13688:2013 - Protective clothing. General requirements

o EN 61482-1-1 (12.4 Cal/cm²) - Live working. Protective clothing against the thermal

hazards of an electric arc.

o EN 61482-1-2:2007 (Class 1) - Live working. Protective clothing against the thermal

hazards of an electric arc.

o IEC 61482-2- Live working. Protective clothing against the thermal hazards of an

electric arc.

o EN ISO 11612 (A1, A2, B1, C1) - Protective clothing - Clothing to protect against

heat and flame

o EN61482-1-2:2007 - Live working. Protective clothing against the thermal hazards of

an electric arc. Test methods. Determination of arc protection class of material and

clothing by using a constrained and directed arc.

Complete range of insulated tools for live working up to 1 000 Volts according to IEC 60900

standard

Steel toe capped insulating boots compliant with:

o EN 50321 Live working up to 1000 volts AC

o EN345-1 & EN 50321 class 0

Prior to work commencing, a visual inspection of the connection points will be carried out, with

particular attention being made to positions where current sensors and G-clamps have been

installed. If there is any doubt regarding the safe removal of the Esprit equipment, work shall not

commence. The issue shall be referred to the person responsible for instructing the installation.

Some LV pillars may contain asbestos; these are indicated with an ‘A’ on the outside of the pillar.

On the first door to open, a photograph is fitted showing the location of the asbestos containing

materials (ACMs). Providing these materials are not displaced during the removal work then the

cabinet is safe to work on. If it is necessary to displace the ACMs, then work will not commence until

the ACMs have been safely removed.

6.2 Decommissioning

The substation shall be returned to its original state, prior to the Esprit equipment installation.

The removal contractor or DNO representative will ensure that the SSEPD/NPG network information

systems (GIS and PLACAR) are updated appropriately to record the removal of the Esprit control and



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any monitoring equipment and all (if any) modifications made to the pillar or cabinet. Figure AII.3

shows a general arrangement of the Esprit installation.

6.2.1 Order of removal

The exact arrangements for removal will depend on the site. Knowledge of each EV cluster

substation will be used to finalise arrangements with the relevant stakeholders. The order of

disconnections and equipment removal will be the same in each case:

1. Separation of Rogowski coil/ Current Transformer cores and removal from LV feeder phase

conductors.

2. Esprit unit commando plug disconnected from PLC injection points (of 3) by the

disconnection of the commando power supply socket

3. Disconnection of Rogowski coils from Esprit enclosure socket

4. Disconnection of Rail 350 monitor power supply cable from Esprit enclosure

5. Disconnection of Rogowski Coils from Rail 350 terminals

6. Removal of Rail 350 and Esprit Enclosures

7. Removal PLC injection/power supply connections through to a commando socket

8. Removal of Rogowski Coils/Current Transformers for Rail 350 and Esprit System from

Feeder phase conductors

9. Removal of cable routes and ducting

10. Any required civil restoration works

11. A detailed visual inspection

A detailed description of the above steps above are described in detail in Sections 6.2.3 to Section

6.2.7.

The order that the cables should be disconnected can be summarised as follows.

1. Disconnect the PLC injection supply cable from the LV busbars. Disconnect the three live

phases first, then the neutral last. Do not disconnect from the feeder board until the Esprit

equipment has been unplugged from the commando socket.

2. Rogowski coils/Current Transformers are to be removed from the phase conductors starting

with the nearest and ending with the rearmost from the front of the board.

3. Disconnect the PLC injection/power supply by unplugging the commando plug and socket.

4. Unclipping of the PLC injection/supply leads and RC/CT leads for the Esprit and Rail 350

unit. Remove from cable routes then coil and tie the leads. Do not coil less than the

minimum bending radii of the leads.

5. Remove commando socket from the wall and move all coils power and current sensor leads

away from LV distribution board and store outside of the substation.

6.2.2 Removal of PLC injection points

Care must be taken to ensure that the removal of PLC Injection Point equipment and connections

does not introduce additional hazards or interfere with the general operational requirements of the

LV fuse board and its function. The commando socket, connected to the Esprit equipment, must be

disconnected before the G-Clamps are removed.

6.2.3 Removal of Rogowski coils and Current Transformers

There is no set arrangement for the disconnection of the Rogowski coils/Current Transformers and

therefore great caution should be taken when removing these devices.



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Figure 16. MC Rogowski coil retaining clip.

Remove the Rogowski coils, by squeezing on the retaining clips at the location shown in Figure 16.

MC Rogowski coil retaining clip.Error! Reference source not found. Remove both the RCs for the

MC and the RC/CTs for the Rail 350 units at the same time. It is likely the CT cores may by stiff to

separate to allow for removal. When removing CTs apply a gentle pulling force to one side and then

the other. Alternate as necessary until the CT core fully separates. Take care not to strike any phase

conductors or busbar apparatus when the CT core are removed from the phase conductors. It is

essential cable cores are only flexed or moved using very gentle force.

All power supply and RC/CT leads running into the LV pillar / fuse board, using the access created

as detailed in Section 4 , should now be removed. Where necessary, cable ties and suitable flexible

conduits should be unclipped as a last step to ensure a no loose cable comes into contact with the

LV busbars and exposed phase conductors during removal. At this point the commando socket

should be unscrewed from the wall (if wall mounted) and removed from the substation

6.2.4 Removal of monitor controller and Rail 350 enclosures

Step 1 – Disconnection of enclosure leads connected to LV fuse board

The Esprit substation equipment should be removed in a de-energised state. Therefore, the Esprit

enclosure commando plug should be disconnected from PLC injection (of 3) through the

disconnection of the commando power supply socket before any removal working commences.

The Esprit Rogowski coils should now be disconnected from the RC socket on the MC enclosure

casing.



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Figure 17. Power Supply Terminal block within MC enclosure.

Step 2 – Disconnection and Removal of the Rail 350 power supply cable and LV Earth

To remove the Esprit enclosure, the Rail 350 monitor power supply cable should be disconnected

from the terminal block (shown in Figure 17), then unclipped from any retaining cable ties and pulled

though the gland in the Enclosure bottom plate. The loose Rail 350 monitor power supply cable

should be shrouded, coiled and taped together, removing any trip hazard or risk of contact with the

live LV fuse board. The substation earth cable should be disconnected from the MC enclosure based

plate at this stage.

The Rail 350 Modbus cable is to be removed at this stage. This can be achieved my removing the

green terminal block from the envoy unit base and unscrewing the Modbus cable cores from the

terminals, located in the green terminal block. The Modbus cable should then be unclipped from

any restraining ties with the MC enclosure and pulled through the Modbus cable gland, situated on

the MC enclosure base.

Step 3 – Disconnection of the Rail 350 RC cables

The Rogowski coils, for the Rail 350 units, should be disconnected from the Rail 350 RC terminals

during this step. Do achieve this, the Rail 350 enclosure cover should be removed by unscrewing

the four plastic retaining screws, which are located below the transparent lid. The cover be should

set aside in a safe place. The RC leads should now be removed from Rail 350 terminal block

(pictured in Figure 18) and pulled though gland situated in the bottom plate of the Rail 350

enclosure. Any loose RC cable should be made safe, ready for eventual removal from the LV fuse

board. The specific terminals to be disconnected are L1+, L1 -, L2 + L2 -, L3 +, L3 – and 3 off SCR.

Rail 350 3PNE

Power Cable

Esprit 3PNE

Power Cable

Esprit Enclosure

Mounting Screw



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Figure 18. Rail 350 Integrator Terminal Block with RC lead terminations.

Step 4 – Removal of MC Enclosure and Rail 350 units from mounting positions

The Esprit MC and Rail 350 enclosures should now be free of any connecting cable preventing their

removal. The Esprit Enclosure has 4 mounting screws, one is shown in Figure 17. Where wall

mounting has been used, safe removal of the MC enclosure is a two-person task. The MC enclosure

screws should only be removed whilst the enclosure is held in place by another removal contractor.

Once the MC enclosure screws have been removed, the Esprit MC enclosure should be removed from

the wall or mounting slab, packed into a pre-labelled box (supplied) and removed from the

substation into a dry and secure environment.

The Rail 350 has four mounting screws, which are at the rear for the enclosure. The Rail 350 screws

can safely be removed by one person. Once the retaining screws have been removed, the Rail 350

enclosure cover should be reattached to the enclosure base. The Rail 350 enclosure should then be

packed into a pre-labelled box (supplied) and removed from the substation into a dry and secure

environment.

6.2.5 Enclosed LV fuse Boards or cabinets

If the installation PLC injection points have used voltage reference connections present on the LV

fuse board enclosure, the split ring terminals or banana plugs should be disconnected at these

locations. The leads shall be disconnected and shrouded in the following sequence; phase 1,

phase 2, phase 3 neutral and finally earth. The disconnected LV leads should be brought down to

the ground, below the height of the phase conductor and cable insulation. The pulling of the PLC

injection/power leads from behind the LV feeders should only be done below height of the phase

conductor and LV feeder cable insulation to remove any risk of contact with the live LV bus bars. If

the PLC injection/power leads are suspended below a checker plate, these may have to be lifted to

allow the removal of the PLC injection/power leads.



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Figure 19. PLC injection/power supply points using split ring terminals at the YHN enclosed LV fuseboard.

If the installation PLC injection points have used insulated G-Clamps, the G-Clamps can be removed

without an outage. Before work commences, any obstructing LV pillar and in-floor checker plates

should be removed to allow good access to the LV busbars. The removal of the power supply / PLC

injection points can be completed by disconnecting the leads via the insulated connectors to the G-

Clamps. The leads shall be disconnected in the following sequence; phase 1, phase 2, phase 3

neutral and finally earth.

Insulated G-Clamps should now be removed from the power supply phases and neutral connection.

G-Clamps have been positioned on neutral and phase busbars to avoid direct interference with

existing lugs/nuts/bolts and hand tightened approximately one full turn from point of contact.

Note – For Drummond G Clamps (DRUMP25, supplied by Martindale) wear electrical rubber

gloves when loosening the restraining clamp with the correct insulated tool. If a very stiff G-

clamp will not loosen using hand force, it should be left in situ and a manager should then be

informed.



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Figure 20. G-Clamp PLC injection connection on the spare feeder way at Bluebell Close Substation,

Wylam.

The main earth connection should be removed last as follows:

Esprit Earth connections, which have been made outside of the LV cabinet or pillar using a bolt,

screw or compression fitting should be unscrewed or removed then disconnected and returned to

its original state i.e. before the Esprit Earth connection was made.

If an external earth connection was not used, and the main earth termination was made using an

insulated G-Clamp, the G-Clamp will be disconnected from main earth conductor/bar which is

normally located at the bottom of the fuse board (Figure 10).




informed.



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.

The notice, to advise any person carrying out work in the future that an earth contact should not be

disconnected, should now be removed (See Figure 11).

6.2.6 Open LV fuse boards or cabinets

Upon satisfactory inspection and identification of the cable access route, the fuse board can be

prepared for removal of the PLC injection points and the Esprit monitor controller power supply. The

removal should begin with the identification of G-Clamp locations within the fuse board where the

phase, neutral and earth connections have been made off using insulated G-Clamps.

Figure 21.Fuse board with G-Clips installed at Cleadon Manor substation.

The removal of the power supply / PLC injection points can be completed by disconnecting the leads

via the insulated connectors to the G-Clamps. The leads shall be disconnected in the following

sequence; phase 1, phase 2, phase 3 neutral and finally earth.

Insulated G-Clamps should now be removed from the power supply phases and neutral connection.

G-Clamps have been positioned on neutral and phase busbars to avoid direct interference with

existing lugs/nuts/bolts and hand tightened approximately one full turn from point of contact.




informed.

The main earth connection should be removed last as follows:

Esprit Earth connections, which have been made outside of the LV cabinet or pillar using a bolt,

screw or compression fitting should be unscrewed or removed then disconnected and returned to

its original state i.e. before the Esprit Earth connection was made.

G-Clamps

Installed on

an open

fuse board



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If an external earth connection was not used, and the main earth termination was made using an

insulated G-Clamp, the G-Clamp will be disconnected from main earth conductor/bar which is

normally located at the bottom of the fuse board (Figure 10).




informed.

The notice, to advise any person carrying out work in the future that an earth contact should not be

disconnected, should now be removed (See Figure 11).

.

6.2.7 Removal of cable routes and ducting

In indoor substations, where the G-clamp and RC/CT leads were cable tied to the LV fuse board

frame, only the removal of the cable tray below the MC enclosure mounting point will be required.

All leads should be removed from the tray before it is removed from the wall.

At this stage any obstructing plates that have been removed, including in-floor checker plates,

should now be returned to their original condition. Any cable access holes made in the LV cabinet

should be filled with blanking glands or other suitable part to ensure the integrity of the LV feeder

pillar from unauthorised contact the live LV apparatus within the LV cabinet.

Figure 22. Cable tray in ground mounted substations.

In outdoor substations, where the G-clamp and RC/CT leads have been run through flexible conduit,

the conduit should be excavated and removed if not already removed.



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Figure 23. Partly buried cable conduit at the Ryans Mount substation in Marlow.

6.3 Site inspection

In addition to the requirements detailed in sections 3 (Management of safety) and 4 (Installation

General requirements for installation) a final visual inspection shall be carried out:

A detailed visual inspection shall include:

The [Eldon (Esprit + Envoy) enclosure] mounting location

The location of cable runs from the [Eldon (Esprit + Envoy) enclosure] to the LV busbar and

Feeder bus bars and phase conductors.

The only alteration to the substation should be the securing holes, drilled into the substation wall,

if the Esprit system was wall mounted. All other Esprit equipment should have been removed from

the substation.

At this point, confirmation from DNO representative should be sought, that the substation has been

returned as close to its original condition as possible.



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Appendix I Ten47 Mini G Clamp and Narrow G Clamp

Specification



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Appendix II Esprit Monitor Controller

The Monitor Controller is connected to the LV mains electricity network, close to the distribution

transformer. The unit monitors the current on each of the three phases & can make intelligent

decisions about the distribution network – issuing commands, via PLC, to connected Intelligent

Control boxes.

Note that the enclosure, monitor–controller, Envoy and ancillaries will be housed together and

delivered built to site.

Figure AII.1 Esprit Monitor Controller (v1.2)

The external enclosure dimensions of the Monitor Controller are: (WxDxH) 320x230x85mm.



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Figure AII.2 Esprit Monitor Controller (v1.2) mounting points (marked by

arrows).



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Method Statment v 2.0.8.docx

14 May 2015 Page 1 of 1

Figure AII.3 General Arrangement.



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Figure AII.4 Diagram of the enclosure and internal equipment.

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