Operational Control of the UKPN Low Voltage Distribution ...library.ukpowernetworks.co.uk/library/asset/e3aea3d1-1ddd-4422-9b… · of the network under LV Site Control and the Unscheduled

UK Power Networks NOP 50 021 v6.0

This printed document is valid at 25/05/18, check after this date for validity. Page 1 of 14

Operational Control of the UKPN Low Voltage Distribution Network for EPN and LPN Regions

Owner

Name Steve White

Title Head of Network Control and Operations

Signature

Date 21 May 2018

Authoriser

Name Adrian Windley

Title LV Control and Dispatch Manager

Signature

Date 17 May 2018

This document forms part of the UK Power Networks Integrated Management System and

compliance with its requirements is mandatory. Departure from these requirements may only be

taken with the written approval of the above authoriser.

Revision Record

Version number 6.0 What has changed?

Section 11 Interconnected networks. NOP 50 021a v8.0 (now v9.0) reviewed, no changes. Why has it changed?

Addition of Code of Practice requirements.

Date published 25/05/2018

Next review date 25/05/2023

Prepared by Adrian Windley


Section 9.1 – Fault switching. Amendments to UHS fuse use, use of Bidoyng’s and an additional section on LV back feeds following a HV fault NOP 50 021a reviewed no changes. Why has it changed?

Review of UHS Fuse and Bidoyng process across EPN and LPN networks. Addition of confirmation of removal of TX links before applying an LV back feed for an HV fault following a VSI.





Section 9.1 – Fault switching. Operational differences when working on cables connected to Bidoyng’s. NOP 50 021a reviewed no changes. Why has it changed?

Review of Bidoyng process across EPN and LPN networks.






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Contents

Introduction and Purpose ............................................................................................ 3 Scope ............................................................................................................................. 3 Objective ....................................................................................................................... 3 References .................................................................................................................... 3 Definitions ..................................................................................................................... 4 Responsibilities ............................................................................................................ 4 Records ......................................................................................................................... 5 Process Detail ............................................................................................................... 5 Faults ............................................................................................................................. 5

Planned Work ................................................................................................................ 9 Planned Work on interconnected networks or LPN Networks >400a Radial .......... 11 Planned Work by Independent Connection Providers (ICPs) / IDNO’s ................... 12 Newly Commissioned / Decommissioned Plant and / or Cable ............................... 12 Information required for fault reporting purposes ................................................... 12 LV Control Contact Details ......................................................................................... 14



Introduction and Purpose

LV Control is established to operate in parallel with the HV and EHV Control functions where the following procedures will apply to operations on the LV network. This procedure replaces NOP 73 001 and NOP 63 001 which have been withdrawn.

Scope

This document covers the control of the LV distribution network within the EPN and LPN Regions and covers both planned and fault work. The primary function of LV Control is to provide guidance and instructions to field operatives working on the LV system. The co-ordination of operations on the LV network for fault restoration work and ensure no planned or ICP works clash. To manage routine operations and running arrangements on the London Interconnected network. The accurate completion and audits of Fault reports and planned interruption reports ensuring full Rig compliance. Maintain an LV operational diagram showing the current running arrangements with annotations covering known and suspected faults and any abnormalities or defects.

Objective

This document defines the responsibility and procedure for operating on the LV distribution system for Real-time Fault Management and Planned Work in each Region.

References

COP 01 001 Fault Handling Process

COP 01 006 System Alteration Notice Procedure

NOP 50 002 Repeat Supply Interruptions

NOP 50 018 Pre-Arranged Interruption Procedure

NOP 72 001 LPN LV Network Sweeps Procedure

NOP 73 002 Ultra-High Speed Safety Fuses for Excavation Repair Work on the LV Network

NOP 73 003 Trial of LV remote Control Equipment

NOC 04 001 Independent Connections Provider (ICP) Street Furniture Metered Connections Jointing to Mains (SFMJ2M) Procedure.

NOC 04 003 Independent Connections Provider (ICP) Unmetered Connections (UMC) Jointing to Services (UJ2S) Procedure.



NOC 04 004 Independent Connections Provider (ICP) Unmetered Connections (UMC) Jointing to Mains (UJ2M) Procedure.

NOC 04 006 ICP Linking and Fusing Service Enquiry Procedure

HSS 40 017 Low Voltage Re-energising devices

HSS 40 017a Low Voltage Re-energising devices – LV Ops handbook

NOP 50 021a LV Switching Operations Schedule

Regulatory Instructions and Guidance (RIGs)

Distribution Safety Rules (DSRs)

EGS 01 004 Electricity Guaranteed Standard 4 (Regulation 12) Notice of Planned supply interruption

DSR 01 014 Excavating near Electricity Cables

Definitions

For the purpose of defining control responsibilities with respect to the boundary between LV and HV/EHV networks, LV control shall have jurisdiction over operations on all plant, apparatus and conductors connected to the LV network beyond, but not including, the LV Transformer Links. Control of PC400’s will have a shared responsibility between LV and HV Control. For LV PC400 Fuse operations LV Control has the authority to instruct replacement and for isolation for work on the LV network. For isolation of PC400’s for work on the HV network HV Control will instruct and receive confirmation of operations. LPN radial networks >400a will be treated the same as interconnected (DSR 01 014 section 8.9) and safety fusing will be required.

Responsibilities

LV Control Engineer

Provide guidance and assistance to field staff if the network is found to be running abnormally and provide any information that may affect repair or restoration such as reports of cable damage.

Maintain an LV operational diagram showing the normal running arrangements with annotations covering known and suspected faults and any planned work where fusing and linking on the network is to remain for longer than 24 hours.

The co-ordination of operations on the LV network for fault restoration work and ensure no planned or ICP works clash.

The LV Control Engineer will give consent to Authorised operators to switch and link on the network following notification of a fault, these sources can include:

o Customer calls advising of no supply or supply voltage variations;

o Staff working on site identifying a fault on the network;



o Alarm received from the Bidoyng System;

o Alarm received from the LV Fuse Monitoring Equipment;

o Alarm received from LV Remote Control and Automation System.

For checking the network running conditions for ICP’s, and confirming to the ICP whether their work can proceed.

The checking and authorisation of switching schedules for Interconnected networks.

The accurate completion of fault reports and Pre-Arranged Interruption (PAI) reports in line with current RIG guidelines.

Authorised Person For all planned work that requires linking and fusing, it is the responsibility of the relevant supervisor to ensure a LV linking and fusing schedule is emailed to LV control for reference if required. LV Control are not required to authorise the schedule All linking and fusing schedules should be prepared with reference to the live operational diagram.

The relevant supervisor will be responsible for establishing that network loading and security is not placed at risk.

Staff who are organising pre-arranged interruption jobs are responsible for completing the necessary documentation, and providing adequate notice of planned works to the Control Centre. All documentation as detailed in NOP 50 018 will be provided via email to the Control Support team at Fore Hamlet.

Records

All records will be held electronically in the Trouble Fault Management system and Fault Reporting system and linking and fusing schedules held in the email system for a minimum of 2 years.

Process Detail

Work on the LV network falls into two broad categories:

Faults (this includes failure of LV plant, apparatus, overhead lines, cables and third party damage).

Planned Work.

Faults

Unplanned operations shall only be carried out by an appropriately Authorised Person and with the consent of the appropriate LV Control Engineer as detailed below, except:

a) In an emergency to avoid Danger, when an Operator may make a circuit dead without prior consent of an LV Control Engineer. Such action and the circumstances giving rise to the need shall be reported to the LV Control Engineer immediately afterwards.

b) Under fault switching where an Operator may replace a fuse once as detailed in section 9.1



The LV Control Engineer Instructs Operations. The LV Control Engineer records the general purpose of the Operations and the Unscheduled Switching number in the appropriate incident log. The LV Control Engineer then instructs the Operator to carry out the Operations and agrees at what stage progress shall be reported. The Operator repeats back the instructions. The Operator records the time that each Operation is complete and informs the LV Control Engineer who records the Restoration Times and dresses the LV Operational Diagram accordingly.

The LV Control Engineer Nominates an LV Site Controller. The LV Site Controller is an Appropriately Authorised Person nominated by the LV Control Engineer to control an agreed section of the LV System. The LV Site Controller is given permission to carry out unspecified Operations on a defined section of the LV system. The LV Control Engineer records the general purpose of the Operations which are to be carried out, e.g. back feed substation, repair LV fault etc., the agreed extent and boundaries of the network under LV Site Control and the Unscheduled Switching schedule number. A statement shall be made on whether permission is granted to operate at open points at the boundaries, e.g. LV network from High St Substation up to and including NOPs. The LV Control Engineer and LV Site Controller shall agree at what stage progress shall be reported. The LV Site Controller records each Operation and the time of completion on an Unscheduled Switching Log. At the agreed stage, the LV Control Engineer shall be advised of the LV network running conditions and shall dress the LV operational diagram accordingly. Upon completion of the work, LV site control will be relinquished and control of the network formally handed back to LV Control.

9.1 Fault Switching

Where a fuse operation has occurred at a substation or pole mounted transformer and there have been no reports of possible damage to the network reported, the following procedures shall apply. The field operative attending will be informed of any report of possible damage relating to the network as soon as it is available. In the following procedures, the use of an approved Fault Re-energising device (HSS 40 017) should be used prior to replacing a fuse to energise a section of network which may have a fault. Alternatively, a Potential Current Indicator may be used to determine if the feeder is likely to be faulty.



Consent for restoration Consent is given for the field operative to carry out the required network checks and attempt restoration from either the substation feed or link-box if no fuses have operated at source, except where:

Investigation is being carried out for SP (Single Premise) incidents. Consent to replace fuses shall be gained from LV Control prior to replacement.

The LV Control Engineer revokes consent by either adding comments to the incident log prior to staff being dispatched or via a telephone call thereafter.

No additional linking or fusing (removal of links / fuses to allow supplies to be restored), or cutting of cables shall be done without the verbal consent from the LV Control Engineer. If information becomes available that requires the LV Control Engineer to revoke consent, a note will be added to the incident log stating the reason(s) why.

Overhead Services from Pole-Mounted Transformers Trace route of service to check for abnormalities. If route is found to be clear use an approved re-energising device, prior to replacing the fuse. Contact LV Control Engineer to confirm state of network.

Overhead Mains Trace route of overhead main including services from Supply point to the NOP(s) to check for abnormalities. Where underground services are connected to overhead mains it is acceptable to check the route for the presence of excavations. If route is found to be clear use an approved re-energising device, prior to replacing the fuse. Contact LV Control Engineer to confirm state of network. Mixed Overhead and Underground Mains Trace route of the overhead line from Supply point to the NOP(s) to check for abnormalities. Walk route of cable from Supply point to the NOP(s) to check for 3rd parties working or any evidence of possible damage If route is found to be clear use an approved re-energising device, prior to replacing the fuse. Contact LV Control Engineer to confirm restoration or discuss further operations, such as sectionalizing on the network to enable supply restoration or aid fault location. Underground Mains Walk route of cable from Supply point to the NOP(s) to check for 3rd parties working or any evidence of possible damage. If the route is found to be clear use an approved re-energising device, prior to replacing the fuse. Contact LV Control Engineer to confirm the time of restoration and/or discuss further operations, such as sectionalizing on the network to enable supply restoration or aid fault location.



The LV Control Engineer shall discuss the incident details with the field staff and shall instruct the field staff to carry out any further network alterations to maintain or restore supplies:

Investigate on site what protection has operated and the extent of any supply failure.

Isolate any faulty section of LV network that cannot be restored to service.

Restore to service all sections of healthy LV network including operations at Normal Open Points on agreed boundary edge.

Report back and update the LV Control Engineer then agree a repair strategy. Note: In the event of loss of supply and there is no access to the feeding substation and testing proves all three phases are dead on the LV network, no attempt shall be made to restore supplies from a NOP to the LV termination until it can be proven that the HV network will not be energised from a back-feed. If access is not available to test at the substation the LV cable(s) must be split at the first link box or feeder pillar leaving the first leg(s) isolated allowing the remainder of the network to be restored. If there is another circuit to a Normal Open Point (NOP) from the same feeding substation, tests shall be made to check if there is continuity of supply thus confirming whether the substation’s HV supply is healthy. If the supply is healthy then the integrity of the HV supply has been proven; therefore the dead LV circuit can be tested and using an approved re-energising device, an attempt made to restore. If there is no access to the local substation and at least 1 phase is found healthy at the circuits NOP or the first link-box/pillar from source then the integrity of the HV supply has been proven; therefore the LV circuit can be tested and using an approved re-energising device, an attempt made to restore Generators When connecting a generator to a single premise or LV main (including LV Bus bars if the TX links were removed under instruction from HV Control, no authorisation is required from LV Control. Once connected, the LV Control Engineer needs to be informed of the time the generator(s) were started and supplies restored. When removing a generator from a single premise or LV main (including LV Bus bars where the TX links have been removed) no authorisation is required from LV Control. Once the generator is dis-connected the LV Control Engineer needs to be informed of the time the generator(s) were disconnected and at what time the customers were put back onto normal supply. If a generator needs to be synchronised to the live LV network authorisation must be gained from the LV Control Engineer prior to any works taking place. Use of Ultra High Speed Safety Fuses To reduce the risk of injury to UK Power Networks staff and contractors whilst excavating or working in the vicinity of faulted or defective low voltage electricity cables and plant, Ultra High Speed Safety Fuses may be temporarily inserted during the course of fault location, excavation and repair.



LV Automatic Reclosing Devices

Automatic LV re-closing devices for example: Bidoyng and Solid State Circuit breakers are being used on the LV network to minimise the time that customers are off supply due to repeat fuse operations. For First Leg out Faults: LV Automatic reclosing devices SHALL be removed from the faulted circuit and replaced with UHS Safety Fuses in fuse carriers prior to commencing any excavation in the vicinity of the fault. If the Bidoyng has UHS fuses already installed in the secondary way then the device does not need to be removed but must be swapped from Primary to Secondary. For Faults between Link Boxes: The LV automatic reclosing devices in the substation can remain in position and SHALL be locked into manual mode and then the UHS Safety Fuses installed into the upstream link box that is feeding the faulted section of cable. For work on all cables connected to Bidoyngs, the Bidoyng must be set to Non-Auto. Emergency Isolations

For all fault repair work on the LV network when a section of LV network needs to be made dead and more than 50 customers will be affected, the LV Control Engineer will contact the Supply Restoration Manager (SRM) or Dispatch Shift Manager (DSM) in their absence before giving consent to make the network dead unless there is immediate danger to the public, in which case contact with the SRM or DSM will be made after the network has been made dead. It is essential that the network is sectionalised, where reasonably practicable to do so, so to only isolate the minimum amount of customers necessary to carry out repairs in a safe manner. HV faults requiring a LV back-feed to restore supplies

Before any consent is given by the LV Control Engineer to apply back feeds to the LV network due to a HV fault they must confirm that the Transformer Links have been opened or removed with the field operative on site and at what time the operation was carried out.

Planned Work

There are two types of planned work on the LV network:

Pre-arranged interruptions (PAI’s) that affect customer supplies.

Work that involves the connection of new plant, apparatus, conductors and / or linking and fusing on the LV network, to maintain supplies.

If customers’ supplies will be affected by a planned job, a Pre-Arranged Interruption (PAI) request form will be submitted to the Control Support team in line with NOP 50 018.

With the exception of LPN interconnected or LPN >400a Radial networks, the following applies for connection of cables and plant (not covered by EDS 08-0133 LV Customer Unmetered supplies, EDS 08-0129 single phase LV Supplies or EDS 08-0143 metered three phase LV Supplies) to the existing LV network.

For planned work that that permanently changes the network running arrangement or additional mains cables / plant are connected to the network, a System Alteration Notice (SAN) will be sent by e-mail to the respective LV Control Team prior to the work taking place, with at least two working days’ notice prior to work commencing.



The email addresses for each network are as listed in last section of this document. The use of email enables electronic filing of requests to be achieved. Planned work - Geoview

A Work Proposed (WP) dressing pin will be placed on the LV diagram by the LV Control Engineer on receipt of schedule or PAI request to indicate that a planned job is proposed. If more than one secondary site is being affected by the works then the LV Control Engineer will place a WP dressing pin on all sites involved. The WP dressing will contain;

The reference number for the planned work (WP job).

Name of the person in charge of the job and a contact phone number.

Proposed date of work and the interruption times if applicable.

The person in charge of the job will be notified of the LVJ number which indicates the work can go ahead

When the WP pin has been placed on the diagram an automated text message will be sent to the person who submitted the booking confirming the LVJ number, planned date, Location and short description of work being carried out.

The WP pin will be activated and changed to a Work In Progress (WIP) pin once it has been confirmed that work has commenced.

All known grid parallels have been marked on the LV Diagram with an embargo symbol, however this is not exhaustive due to, for example, temporary HV/EHV network running alterations.

Once work has commenced and changed to WIP an automated text message will be sent to the person who submitted the booking confirming planned work has commenced.

A daily planned works list will be produced for LV Control to use as a whereabouts for all notified planned works scheduled for that day.

Planned work - Field operations

On the day of the proposed work, a call will be made to LV Control to confirm the running conditions are as expected prior to commencing with work. A second call will be made on completion of the work and a message left to confirm what time the work has finished, and that the network has been restored to normal. The message must include the person’s name, contact details of person on site, the LVJ number and the PAI incident number (if applicable).

Where there is a possibility of making/breaking open points across a grid parallel during any switching schedule then a call must be made to LV Control prior to the operation being carried out to enable the running conditions of the HV network to be checked.

If no supplies are received once planned works has commenced LV Control must contact the operative on site to inform them to stop work and discuss what operations have taken place. The LV Control Engineer will pin the diagram with the full extent of the planned works and give instruction/authorisation to restore the customers and agree any further works.

If operative establishes that the network is not running as expected or a fault is discovered whilst carrying out the planned switching then LV Control must be contacted immediately. If supplies are lost unexpectedly supplies must be restored immediately followed by a call to LV Control. For example a set of fuse/links is removed which should not affect supplies but does, replace the fuse/link then contact LV Control to discuss.

For all jobs with duration of greater than one day, the appropriately authorised person in charge of the work will contact LV Control to confirm the LV running conditions at the end of each day. The LV Control Engineer will dress the network diagram appropriately.



HV Works – confirmation of isolation

For all LV isolations which form part of an HV job, confirmation of isolation of the LV shall made to the HV Control Engineer who will dress the HV diagram to confirm the isolation of the LV network. A call to LV Control is not required.

Pre –arranged interruption’s (PAI)

If a PAI job is to be postponed or cancelled prior to the planned start date, Control Support must be notified who will re-date the PAI Troublecall incident or cancel from the system.

If it is necessary to cancel a planned job, a call will be made to the LV Control Engineer to confirm cancellation of the work. The LV Control Engineer will complete the WP pin and cancel the incident. If a job is postponed prior to the start date, the WP pin and PAI incident can be re-dated if required.

Any PAI job that has gone live cannot be re-dated and will need to be re-submitted and the original PAI incident cancelled.

For LV PAI jobs affecting customer supplies, LV Control must be informed of the time of isolation and the time customer’s supplies were restored. The LV Control Engineer will record these times in the incident and complete the associated PAI fault report.

For PAI jobs where the actual restoration time is expected to be beyond the time the customer was notified that supplies would be restored, the person in charge of the PAI will telephone Dispatch as soon as they are aware that the job is running late to confirm the anticipated restoration time.

Planned work completion

Once it has been confirmed work is complete and the network has been restored to normal the WIP pin will be closed and an automated text message will be sent to the person who submitted the schedule confirming works are complete.

On completion of any work that permanently alters the LV running arrangement; the LV Control Engineer must be notified, they will then update the LV operational diagram with a temporary Information Pin/sketch to show the changes as detailed on the associated SAN.

If LV Control is not provided with the information required by the person in charge of the works, no further bookings will be processed until the information is received.

Once the diagram has been updated by Network Records, the LV control engineer will remove the temporary Information Pin.

Planned Work on interconnected networks or LPN Networks >400a Radial

No work shall take place unless the live cables to be worked on are protected by Safety Fuses at an appropriate point in the system. Wherever practicable, safety fusing shall be by means of one set of fuse links of a size no greater than 315A, installed at the nearest appropriate point of isolation. Permanently installed fuse links of up to 400A, excluding fringe fuse links, may be left in place, where multiple fusing operations would otherwise be required. The following alternatives may, however, be adopted where loading conditions dictate: One set of 400A fuse links, excluding fringe fuse links, installed at the nearest appropriate point of isolation. Two sets of fuse links of a size no greater than 315A, installed at the two nearest appropriate points of isolation, one each side of the point of work.



For all planned work on the interconnected network or LPN Networks >400a Radial, a copy of the LV switching schedule shall be completed and sent by e-mail to the respective LV Control Team for authorisation prior to the work taking place. Two clear working days’ notice of any job which involves working, fusing or linking on the LV Interconnected Network must be provided to ensure LV Control has sufficient time to check and authorise. Upon authorisation the Control Engineer will return the switching schedule to the person who has submitted.

Following receipt of the approved LV switching schedule the process is the same as indicated in section 10 Planned Work on Radial Networks

Planned Work by Independent Connection Providers (ICPs) / IDNOs

For ICP / IDNO work on LPN interconnected or LPN >400a Radial networks, where the ICP is not authorised to alter network running conditions through linking and fusing, NOC 04 006 applies.

For planned work that requires linking and fusing and the ICP /IDNO is authorised for linking and fusing, then a copy of the LV switching schedule (NOP 50 021a) will be required via email, to LV Control.

For planned work where no linking and fusing is required, the ICP supervisor will notify LV Control of planned works via a telephone call (48hrs notice required – less than this, at the discretion of the LV Control Engineer). The LV Control Engineer will pin the LV diagram (Geoview) with a WP (Work Proposed) pin and return reference number (LVJ) to ICP supervisor during call.

On the day of the planned work, the ICP operative shall contact the Control Engineer by telephone to request confirmation that the LV diagram dressing has not changed in a way that would prevent the works proceeding. If no material change is indicated then work can commence. On completion of work, the ICP shall contact LV Control to confirm work complete and the relevant dressing symbols removed.

In the event that a material change to running conditions of the network is identified when the Control Engineer checks the LV diagram, then work shall not commence.

Newly Commissioned / Decommissioned Plant and / or Cable

A System Alteration Notice (SAN) must be submitted to Network Records within 24 hours (one-working day) of completion of works affecting the LV network.

Information required for fault reporting purposes

Reason for the loss of supply; Network conditions upon arrival; Substation name / TC Number or F/P / L/B Number where the supplies have been lost from; Feeder way or destination of the LV feeder; Phases affected; Fuse size operated; Fuse size replaced; For O/H line faults the pole number where the incident occurred; Pole number / Tx name where circuit was isolated; Load picked up after supply restored; Times for each stage of restoration with detail of which section was restored;



Times for each stage of isolation and details of which circuit was isolated; For open circuit faults the number of phases affected and details of where the open circuit is, i.e. first customer affected etc.; Where a generator or temp loop is installed, the time the customer(s) were restored and which customers were restored. Where the generator or loop is removed, the time of disconnection and reconnection.



LV Control Contact Details

EPN LV Control E-mail address for bookings- EPN LV Control ([email protected])

LV Control Faults

Bedford/Cambridge 03301591744

Borehamwood/Pinner 03301591749

Bury/Ipswich 03301591760

Chelmsford/Clacton 03301591754

Enfield/Harlow 03301591758

Harold Hill/Rayleigh 03301591750

Kings Lynn 03301591752

Hemel/Luton/Stevenage/St Albans 03301591747

Broadland 03301591751

Peterborough 03301594915

Norwich 03301594917

LV Control Planned

Chelmsford/Clacton 03301591755

Bedford/Cambridge 03301591746

Enfield/Harlow 03301591759

Harold Hill/Rayleigh 03301591757

Hemel/Luton/Stevenage/St Albans 03301591756

Kings Lynn/ 03301591745

Bury/Ipswich 03301591773

Broadland 03301591761

Borehamwood/Pinner 03301591748

Peterborough 03301594916

Norwich 03301594918

LPN LV Control E-mail address for bookings - LV Control ([email protected]) LV Control (General) 03301 591 814 (T/C Access, completed works, non-urgent, etc.) LV Control (Planned) 03310 591 813 (Planned Supply Interruptions) LV Faults (North) 03301 591 815 LV Faults (South) 03301 591 818 LV ICP Line 03301 591 817

mailto:[email protected]

mailto:[email protected]

Documents

Operational Control of the UKPN Low Voltage Distribution ...library.ukpowernetworks.co.uk/library/asset/e3aea3d1-1ddd-4422-9b… · of the network under LV Site Control and the Unscheduled