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High Voltage and Low Voltage Installation Solutions

We can work collaboratively with you to provide an optimum solution for your power requirements.

Whatever your needs we can provide the complete High Voltage and Low Voltage power distribution package within substations and interconnecting networks. Utilising our specialist resources, we aim to deliver the very best in electrical solutions. Our vast experience in the construction, operation, and maintenance of power distribution systems, coupled with the knowledge gained from listening to our customers, has placed IUS at the forefront of power distribution engineering. 

We are dedicated to delivering your power solutions from design, supply, construction, and installation, through to the testing and commissioning of electrical distribution systems from Low Voltage through to 132kV. These can be new installations, replacement of assets or refurbishment of existing systems.

 

IUS have a range of experience in this field. Read more about our expertise.

IUS is a turnkey contractor with the capability to survey and design all aspects of substation and feeder route activity, to deliver an optimum solution. We have a documented design management process across all our business sectors including Multi Utility, Independent Connections, Primary Major Project Substations and general High Voltage Contracting activities. The process defines quality system requirements and establishes and maintains a consistent approach to the design of electrical and where required, gas and water networks.

This ensures suitably qualified and experienced staff are engaged on the design, prevailing standards are adhered to and finalised designs are checked and approved before release. Our procedure defines responsibilities and routines, which shall be applied to your contract specific designs. All personnel involved within this procedure are made aware of their responsibilities and are adequately trained and competent to undertake designs allocated to them. Staff are trained and developed in accordance with our staff selection, training and development procedure.

With an approved design in place, IUS can meet all your electrical construction needs, with the ability to competitively procure High Voltage switchgear, transformers, cables and all ancillary items required within a substation. We have the necessary experience within our design and operational delivery teams to identify the appropriate apparatus to build an effective power solution. This can be an adoptable Independent Connection; a High Voltage Distribution Network; a Primary Major Project Substation or a Multi Utility scheme. Our policy establishes the standards to ensure that all procurement activities are carried out professionally, ethically and in compliance with all laws and legislative requirements. The policy also takes into consideration our commitment to safety, the environment and the principle of total quality. The Company adopt a consistent approach to best practice procurement procedures with robust processes and systems in place.

In advance of the site works, IUS will produce the necessary site-specific documentation to meet your construction requirements. Collated via our dedicated Project Manager, this will include method statements, risk assessments, HSQE plans, delivery programmes as well as reporting templates. The on-site works will be installed with Quality Assurance applied throughout the delivery phase. Also, via our Customer Charter, we seek Feedback on your experience with IUS.

Throughout our substation construction and maintenance activities, control of electrical safety on site is a vital part of the services IUS provides. Our in-house testing and commissioning staff have a wealth of experience regarding switching tasks, issuing and cancelling of safety documentation, testing electrical protection relays and commissioning new apparatus including High Voltage switchgear, DC systems, SCADA and remote-control devices.

When carrying out works for Distribution Network Operators, installing Independent Connections, constructing Primary Major Project Substations or completing High Voltage Contracting activity, our Senior Authorised Personnel have the necessary experience, training and competency to effectively manage an electrical network safely. Our capability also extends to our Multi Utility business where we will test and commission your electricity, water and gas networks.

In addition to designing, supplying, installing and testing & commissioning your substation apparatus, IUS can Operate and Maintain your High Voltage system. As defined in the Electricity at Work Act 1989, there is a requirement for High Voltage network owners to maintain electrical equipment in a safe condition. To achieve this IUS has the High Voltage authorised, competent and experienced personnel to complete substation inspections as well as planned maintenance of switchgear, transformers and ancillary apparatus. Our High Voltage Customer Service (HVCS) manage a multitude of clients across all sectors including renewables, health, education, water, petrochemical, pharmaceutical, defence and manufacturing industries.

We also carry out a range of services for Distribution Network Operators, where our operational staff has comprehensive knowledge of Distribution Safety Rules and Operational Practice Manuals. We can also provide added value services associated with power system protection studies, generator connections, harmonic surveys, power factor correction, partial discharge testing and transformer oil analysis. As your appointed Operation and Maintenance contractor IUS will provide the High Voltage authorised personnel for both planned works as well as fault diagnosis and emergency repair. Our aim is to engage collaboratively with your organisation to satisfy all current legislation including the HSG230 requirement to keep electrical switchgear safe. This will assist in allowing staff to work safely and maximise your High Voltage apparatus asset life cycle.

Leeds City Station Sandford Street Switchgear Replacement

Leeds City Station

Network Rail awarded IUS the contract for the replacement of the existing 11kV distribution substation at Leeds City Station ...

Client

Network Rail

Project

Leeds City Station

Location

Leeds

SERVICES PROVIDED
  • Relocation of existing cleaners compound with a purpose built cladded structure
  • Construction of substation buildings for Network Rail and Northern Powergrid
  • Installation of domestic electrical supplies within buildings
  • Installation of fire alarms
  • Installation of 11kV switchgear
  • All 11kV electrical protection
  • Installation of containment
  • Installation of 11kV cables
  • Jointing and termination works
  • All civil activity
  • Removal of redundant switchgear
OVERVIEW

Network Rail awarded IUS the contract for the replacement of the existing 11kV distribution substation at Leeds City Station. The existing oil filled switchgear was replaced with new apparatus. The works were coordinated to incorporate changes to the Northern Powergrid equipment.

DESCRIPTION

Owing to existing 11kV switchgear at Leeds City Station reaching the end of its life span, a solution was required for the seamless renewal of the switchgear, whilst maintaining supplies to an operational train station. The former location of the existing 11kV substation was below ground in an area known as the ‘Dark Arches’. The train station was built on a set of vaulted arches with an area occupying distribution substations.

Logistically the location of this existing substation was unsuitable, therefore a purpose built substation was constructed at platform level, containing both Northern Powergrid and Network Rail equipment in separate sides of the building.

Two parallel 11kV feeders were taken directly from Northern Powergrid’s Whitehall Road primary substation. The approximate route length was 0.25 miles. Two parallel circuits then fed the Network Rail FKI Eclipse switchgear.

Each of the six Network Rail 11kV circuits supplied six 11,000/433V ground mounted transformers. These transformers were resupplied via new 11kV cabling. IUS managed all the critical power outages to deliver the works whilst trains continued to operate.

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NPg Automation Installation

NPg Automation Installation

IUS secured a contract to deliver NPg Automation, which improves their customer service via network control remote switching capability ...

Client

Northern Powergrid (NPg)

Project

Urban Automation

Location

Hull

SERVICES PROVIDED
  • Civil excavation works
  • Remote Terminal Unit (RTU) installation
  • Testing and commissioning including with NPg control centre
OVERVIEW

IUS secured a contract to deliver NPg Automation, which improves their customer service via network control remote switching capability. This reduces electrical downtime for customers should a fault occur on the network. An RTU can be utilised to carry out remote High Voltage switching to quickly restore supplies. IUS are providing installation, commissioning, and technical support services to improve network restoration times via remote switching capabilities for 11kV ground-mounted switchgear. This is achieved via a central control centre over a secure radio network.

DESCRIPTION

The work involved carrying out a survey at the substation location to ascertain if the site is suitable for automation. The survey considered the existing 11kV switchgear installed on site; network design required by NPg and signal strength tests for connectivity onto the secure communication network. The survey identifies the automation equipment to be installed and if any civils work is required.

Civil works were completed on this site, which allowed cable connections to be installed to the existing switchgear and new RTU telecontrol equipment. The new RTU was installed on a frame with umbilical cables, connecting the new actuators, which are fitted to the 11kV switches. The design incorporates fault path indicators, which are automated and wired into the RTU. These indicate back to control if a fault occurs. A power supply for the RTU is connected to the Low Voltage feeder pillar within the substation compound, which is monitored by the RTU and control centre.

Commissioning of the site is carried out by the IUS Senior Authorised Person (SAP). Final connections were made on site, with all local operational tests carried out. Once satisfied that the installation was operationally ready the SAP contacted the control desk engineer and carried out any network reconfigurations required under a system outage, to allow remote operation. Remote testing was accomplished by the control desk engineer and the automation equipment was transferred into operational use on the NPg network.

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NPg Automation Commission - Spring Bank

NPg Automation Commission

IUS has been involved in supporting NPg automation for many years in a bid to help sustain and improve the infrastructure and network control remote ...

Client

Northern Powergrid

Project

Automation

Location

Spring Bank Road 644, Farsley, Leeds

SERVICES PROVIDED
  • Test/Commission of RTU & Actuators.
OVERVIEW

IUS has been involved in supporting NPg automation for many years in a bid to help sustain and improve the infrastructure and network control remote switching capability which lessons power outages for customers should a fault or trip occur. As such IUS provides installation, commissioning, and technical support to NPg, which improves network restoration time and remote switching capability for 11kV ground Mounted switchgear.

DESCRIPTION

The work involves carrying out a detailed survey of a substation to ascertain if the site is suitable for automation. The survey considers the switchgear installed, network design required by NPg and signal strength tests for connectivity to a secure communication network. The survey would identify the automation equipment to be installed by approved remote terminal unit (RTU) installers, and later actuators to be commissioned by an IUS senior authorised person (SAP).

Site installation of the RTU was carried out following a successful site survey to identify where the unit would be wall-mounted and umbilical cables run between RTU and the switchgear already pre-installed. The design incorporates fault path indicators to be automated and wired into the RTU that indicate back to control if a fault occurs.

Commissioning of the site was carried out by an authorised SAP. Final connections were made onsite and local operational tests were carried out. Once satisfied that the installation was operationally ready the SAP would contact the control desk engineer and carry out any network reconfigurations required under a system outage to allow remote operation. Remote testing is accomplished by the control desk engineer and the Automation equipment made operational on the NPg network.

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DNO Frameworks Northern Powergrid Areas

DNO Frameworks Northern Powergrid

IUS currently deliver an extensive portfolio of frameworks for Northern Powergrid (NPg). These ...

Client

Northern Powergrid

Project

Multiple Frameworks

Location

North East and Yorkshire

SERVICES PROVIDED
  • Overhead line construction
  • LV overhead line shrouding
  • Overhead line inspections and remedials
  • Overhead line maintenance
  • Substation automation
  • Ground mounted HV maintenance
OVERVIEW

IUS currently deliver an extensive portfolio of frameworks for Northern Powergrid (NPg). These encompass both overhead line (OHL) and ground mounted (GM) works. Over a considerable number of years, IUS has been consistently achieving exemplary customer satisfaction by delivering a safe, compliant and quality service. The customer satisfaction achieved is not only with the client but the millions of customers connected to the NPg network.

DESCRIPTION

IUS deliver extensive low voltage (LV) OHL rebuild and refurbishment works, replacing NPg’s open wire network with Aerial Bundled Conductor (ABC) and changing rotten and defective poles where required. IUS also delivers LV OHL shrouding works for NPg, where protective shrouding is placed over exposed LV conductors to allow customers to have building and construction works completed in close proximity to the LV network. IUS exclusively deliver these works for NPg, managing the end-to-end process to strict customer service and guaranteed standard guidelines. In addition to these two core overhead line frameworks, IUS also deliver OHL inspection and remedial works for NPg, ensuring that their high-risk sites meet the necessary ESQCR standards required. IUS also deliver OHL earth tests and earth mat replacement works.

IUS is the sole deliverer of GM Automation works. On this framework, IUS instals actuators and Remote Telecontrol Units (RTU’s) in to existing NPg secondary substations. Once commissioned, these sites become automated, meaning that NPg’s Network Control Center can operate their switchgear remotely, improving restoration and response times for their customers in the event of network faults or damages. In addition, IUS also delivers GM HV substation maintenance and Fault Path Indicator (FPI) replacement works for NPg. Delivering this service, ensures that their HV network is kept up to standard and will operate as necessary when worked-upon or in the event of a fault or damage.

To deliver the above frameworks, IUS has an extensive direct team of Project Managers, Project Coordinators, Planners, Supervisors, SAP’s, AP’s, Fitters, Linesmen and Jointers. All of these staff are fully authorised to work and operate on NPg’s LV and HV overhead and underground electrical networks. They are all centrally managed, which assists with a consistent approach including efficient programming.

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Secondary Scada Commission

Secondary Scada Commission

NPg operates a ground mounted remote-control system across their distribution substation network. This system enables them to monitor plant on ...

Client

Northern Powergrid

Project

Secondary SCADA

Location

Castleford Batch Two

SERVICES PROVIDED
  • Test and commission of RTU radios
OVERVIEW

NPg operates a ground mounted remote-control system across their distribution substation network. This system enables them to monitor plant on the distribution network and carry out remote switching from the system control centres.

To enhance the capability and capacity of this system, NPg requires the commissioning of radio equipment at strategically identified sites on the distribution network across both the NPg Northeast plc and NPg Yorkshire plc license areas. This will minimise the impact and duration of unplanned fault related loss of supplies to reduce the number of Customer Minutes Lost (CML’s) and therefore support the vision of providing an excellent Customer Service.

DESCRIPTION

The scope of work is to update existing equipment and software for remote-control systems aligned with the NPg Secondary SCADA project for 2022. The work is on the 11kV and 20kV ground mounted networks in both licenced areas and is a mixture of indoor and outdoor substation locations.

Work will include:

  • Management of radio commissions when at the site.
  • Provision of suitably skilled and authorised staff for all HV switching and commissioning-related operational activities.
  • Organisation of the HV outage requests on the NPg network in the northeast. This may include IUS switching out HV circuits and issuing safety documentation where applicable.
  • In Yorkshire, liaison with the NPg Telecommunications team to facilitate testing and change of the substation site radios and commissioning confirmation.
  • Arrange all necessary access permissions, highlighting any substation issues where sites are inaccessible or have vegetation issues, which should be reported as part of basic housekeeping through the 159-reporting process (NPg Amp 2 View application).

Critical to the successful delivery of these works is the effective liaison with NPg’s Secondary SCADA Project team, Telecommunications, Technical Service teams, and appointed third-party companies and EMR Integrated Services. IUS worked collaboratively on-site with the NPg-appointed contractors to facilitate the collective delivery of this work.

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Castle Hill Hospital

Castle Hill Hospital

IUS were contracted by Hull University Teaching Hospitals NHS Trust to install the 11kV Infrastructure for a new 5MWe Solar Farm on land adjacent to Castle Hill Hospital ...

Client

Hull University Teaching Hospitals NHS Trust

Project

11kV Infrastructure for a 5MWe Solar Farm

Location

Castle Road, Cottingham, Hull

SERVICES PROVIDED
  • HV network design
  • P28 / G99 reports
  • G99 protection design
  • Earth design and report
  • Civils construction designs
  • Ground survey reports
  • Installation of 11kV infrastructure (cable installation and civils, transformers, and switchgear)
  • Test and commissioning
OVERVIEW

IUS were contracted by Hull University Teaching Hospitals NHS Trust to install the 11kV Infrastructure for a new 5MWe Solar Farm on land adjacent to Castle Hill Hospital, as part of the trusts plans to become carbon neutral by 2030.

DESCRIPTION

IUS provided expert support for the scheme, by designing the HV network, P28/G99 studies and reports, G99 protection study, earthing report, ground surveys & borehole analysis, heat gain calculations, construction designs and all other relevant design requirements. IUS constructed two substations inclusive of HV compounds, LV plant rooms and inverter rooms. The cable/duct installation carried out by IUS, involved excavation by conventional open cut trench, as well as horizontal directional drilling method.

IUS supplied and installed:
1x 2MVA transformer, 1x 3MVA transformer, 2x 11kV ring main units, 2x battery tripping units and relay panels. The IUS scope of service included an in depth and technical G99 protection scheme, installed in compliance with the local Distribution Network Operator, Northern Powergrid specification.

IUS provided a dedicated project team to ensure the day-to-day running of the project was carried out safely, efficiently and to a high quality standard, to the client’s satisfaction. IUS also provided our ‘in-house’ senior authorised person and technical service support throughout the project to ensure safe systems of work were implemented and maintained and equipment/protection was pre-commissioned to the highest of standards.

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Freeman Hospital

Freeman Hospital

Robertson CE Ltd has constructed a new building at the Freeman Hospital site, now named the Day Treatment Centre. IUS's scope of works included the design ...

Client

Geoffrey Robinson Ltd

Project

Day Treatment Centre

Location

Newcastle Upon Tyne

SERVICES PROVIDED
  • HV and LV design
  • Supply and installation of HV apparatus and cabling
  • Supply and installation of LV cabling
  • Supply and installation of HV/LV earth nests
  • Supply and installation of electrical protection system
  • Testing and commissioning
OVERVIEW

Robertson CE Ltd has constructed a new building at the Freeman Hospital site, now named the Day Treatment Centre. IUS's scope of works included the design, procurement, and installation of two air-cooled 11000/433V transformers with close coupled 11kV ring main units within a new substation constructed for the Day Treatment Centre. 11kV cables were supplied and Installed from an existing substation within the hospital to the Day Treatment Centre substation along with LV cables from the substation to the adjacent LV switch rooms.

DESCRIPTION

Initial design works were completed by IUS, which included a high voltage fault level and load flow study along with a protection and grading study. An earthing study was also completed for the new substation.

Two Schneider 11000/433V air-cooled transformers c/w close coupled HV ring main unit and LV cable box were supplied and installed within the new substation. An HV/LV earth nest was installed adjacent to the substation as per the design. An Intertrip relay control unit and associated cabling were supplied and installed within the new substation for each transformer for the electrical protection of the transformers.

Two 11kV cable circuits were supplied and installed from an existing substation integral to the main hospital building to the new substation. This consisted of cable fixed to containment within the hospital and external cable laid within an open cable trench excavated by others, at a length of 300m. LV cables were supplied and installed internally within the new substation from the two transformers to the two LV switchboards, with cable terminations at each end.

11kV cables were terminated at the new substation via the 11kV ring main units. The configuration resulted in the new substation being looped into the existing 11kV ring. The system was tested and energised by the IUS SAP.

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Northern Powergrid Asset Replacement Works In Doncaster

Northern Powergrid Asset Replacement

IUS has a framework in place with NPg, which includes asset replacement activity. IUS has been ...

Client

Northern Powergrid (NPg)

Project

Asset replacement

Location

Franklin Crescent, Doncaster

SERVICES PROVIDED
  • Substation survey
  • Outage planning
  • Safe systems of work
  • Civil excavation
  • Switchgear removal
  • New switchgear installation
  • Transformer cable box change
  • 11kV cable jointing
  • Testing and commissioning
  • Handback documentation
OVERVIEW

IUS has a framework in place with NPg, which includes asset replacement activity. IUS has been commissioned to deliver six 11kV switchgear replacements in 2022, where aged oil insulated equipment will be replaced with new High Voltage (HV) apparatus, which will enhance the NPg network. This is the type of work IUS also deliver for customers with privately owned HV apparatus.

DESCRIPTION

IUS conducted detailed surveys of these secondary 11kV substations on NPg’s behalf to ascertain the requirements for the delivery of the works. The survey encompasses asbestos removal, street work notices, if generation is applicable, network transfer at low voltage, any civil adaptions, as well as liaison with the local community via letter drops for planned outages. This all takes place to ensure a problem free switchgear replacement.

Following the implementation of Safe Systems of Work by the IUS Senior Authorised Person (SAP), oil filled Yorkshire Switchgear and Circuit Breakers are removed by our electrical fitters in conjunction with the IUS HIAB driver. A new Schneider Electric RN2C Ring Main Unit (RMU) is then installed in its place. The original switchgear is returned to NPg for recycling. The IUS electrical fitters secure the new RMU in place and make the necessary connections to the existing earthing system within the substation. The transformer 11kV compound filled box is replaced with a new ‘dry box’ unit, allowing for the installation and termination of 300mm triplex cable. This cable is installed from the jointing position, outside the substation, where it is straight jointed to the existing NPg 11kV network by the IUS cable jointers.

The IUS SAP completes the work via continuity, insulation resistance and pressure testing prior to the substation equipment being energised. All subsequent test results and hand back documentation is collated and returned to NPg for their records.

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