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High Voltage
Electrical Substation Maintenance

As your appointed High Voltage maintenance services contractor, IUS will provide the High Voltage authorised personnel for both planned works as well as routine preventive and breakdown maintenance of substations. 

In addition to designing, supplying, installing, testing, and 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 switchgear maintenance, transformer maintenance, as well as ancillary apparatus. Our High Voltage Customer Service (HVCS) team manages a multitude of clients across all sectors. 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.

For routine preventive and breakdown maintenance of substations, IUS also provides a fault repair and supply restoration service for our contracted customers. The HVCS team will issue the associated reports and evidence that your network is being effectively managed. 

We aim 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.

 

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High Voltage Infrastructure Maintenance
 

IUS has 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 in this procedure are made aware of their responsibilities and are adequately trained and competent to undertake the designs allocated to them. Employees are trained and developed through our 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 adopts 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, testing, and commissioning your substation apparatus, IUS offers High Voltage equipment maintenance.  As defined in the Electricity at Work Act 1989, there is a requirement for High Voltage network owners to ensure substation maintenance is achieved, including substation inspection, switchgear maintenance, and transformer maintenance. To achieve this, IUS has the High Voltage authorised, competent, and experienced personnel to complete substation inspection as well as planned switchgear maintenance, transformer maintenance, and ancillary apparatus. Our High Voltage Customer Service (HVCS) team manages 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 have 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 High Voltage maintenance services contractor, IUS will provide the High Voltage authorised personnel for both planned works as well as fault diagnosis and emergency repair. We aim 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 asset life cycle.

Emergency Response & Repair following 11kV Fault on a Contracted Customer Network

New Switchgear

Client

Food Manufacturing Facility

Project

Emergency Response & Repair following 11kV Fault on a Contracted Customer Network

Location

Spalding, Lincolnshire

New Switchgear
New Switchgear
SERVICES PROVIDED
  • Out of hours response to a call following loss of supply
  • Project and fault management
  • Generator connection to restore temporary supplies
  • Safe systems of work
  • Switchgear removal
  • New switchgear installation
  • 11kV cable jointing and terminations
  • Testing and commissioning
  • Restoration of permanent supply
  • Handback documentation
OVERVIEW

Integrated Utility Services (IUS) carried out works at a large food manufacturing facility that provides products for supermarkets throughout the UK. Their intake substation is operated via National Grid Electricity Distribution (NGED).

DESCRIPTION

The IUS Senior Authorised Person was called out to a loss of supply at the facility, attended the site and assisted NGED following a Distribution Network Operator Circuit Breaker trip. 

 The HV configuration included an aged, oil filled (Brush) combined 11kV Switchboard, with 3 NGED owned panels and 3 customer owned panels.

There was also a separate, customer owned two panel Schnieder Electric CE2/CE6 switchboard, connected via a HV cable loop. Their power supply is essential and the benefit of having an Operation & Maintenance Agreement with IUS, for their private 11kV network, was demonstrated following a fault.

We have had historic problems with the old Brush switchgear with various fault repairs completed on this network. However, it was a flashover on the NGED owned 11kV metering Circuit Breaker, which caused a loss of supply and an emergency response from both IUS and NGED.
 

To initially restore supplies, generation was arranged by the customer with IUS implementing the required safe system of work including HV switching and the issue of safety documents. This arrangement would provide a temporary supply solution and enable NGED to carry out any required repair works on their own equipment. 

Following consultation with the client, it was decided the most appropriate way to proceed would be to replace the Brush oil filled switchgear with new Schneider Electric SF6 insulated apparatus. This would be achieved by extending the existing Schneider Electric switchboard with a further 3 panels. With safety documentation in place, the old Brush switchgear was disconnected and removed. 

The new Schneider Electric apparatus was installed and 11kV cable jointing and terminations where undertaken.  Working collaboratively with the customer and NGED the installation was completed, tested, commissioned and energised. This would allow normal supplies to be restored, and the generators to be disconnected.

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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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Maintenance response: 11kV Fault Repair on a Contracted Customer Network

High Voltage Substation Maintenance

Integrated Utility Services (IUS) has an Operation and Maintenance agreement with a Packaging Manufacturing facility in the West Midlands. The client contacted our 24-hour HVCS emergency services team to attend site following an interruption of supplies.

Client

N/A

Project

11kV Fault Repair on a Contracted Customer Network

Location

West Midlands

SERVICES PROVIDED
  • Out of hours response to a call following loss of supply
  • Isolation and fault investigation
  • Project and fault management
  • Safe systems of work
  • 11kV cable jointing and terminations
  • Testing and commissioning
  • Generator connection to restore temporary supplies
  • Restoration of permanent supply
  • Handback documentation
OVERVIEW

Integrated Utility Services (IUS) has an Operation and Maintenance agreement with a Packaging Manufacturing Facility in the West Midlands.

The client contacted our 24-hour HVCS emergency services team to attend site following an interruption of supplies.

Upon attendance, the IUS Senior Authorised Person (SAP) identified an 11kV cable fault immediately below the cable box of the Transformer No.3 Circuit Breaker. We implemented a safe system of work, in accordance with IUS Distribution Safety Rules and progressed the repair through to completion, testing and restoration of supplies.

DESCRIPTION

IUS received a call from a contracted customer at their manufacturing site following an interruption to their electricity supply. An SAP was immediately dispatched to respond to the customer fault. On arrival our SAP identified the fault and made the situation safe by providing the required isolations. This allowed IUS to proceeded with an investigation and found that the 11kV cable had disruptively failed below the cable box on the 11kV Circuit Breaker feeding Transformer No.3.

In consultation with the client, it was explained that a section of the 11kV cable would need replacing. This resulted in the existing 11kV cable being cut in a suitable position so the termination could be disconnected and removed. The SAP arranged for an IUS jointing and fitting team to attend site and the faulty cable was removed. A new 11kV triplex cable was installed and terminated to the cable box, and an 11kV joint was completed in accordance with IUS procedures. The cable box was filled with Guro flex as it was an old-style box, which would not provide the required clearances for an air termination.

The new 11kV cable installation was tested, and a post fault maintenance was completed on the 11kV Circuit Breaker, before restoring the supply back to normal. Liaison with our customer was vitally important, whilst the work was undertaken. This included our SAP returning to site to change over the customer supplies from a temporary generator to its normal supply.

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