High Voltage Commissioning
HV commissioning, maintenance & SAP provision

Ensure power grid integrity

Specialist high voltage testing and commissioning services. From 11kV package substations to 132kV bay commissioning, our HV engineers and senior authorised persons deliver compliant, efficient and safe energisation across the UK.

Request a quote0333 335 7513
11kV–132kV
Voltage range
SAP
Senior authorised persons
UK-wide
Site coverage
Switchgear testing
Transformer analysis
Protection relaying

Trusted across critical infrastructure

Data centres
Facilities maintenance
Independent connection providers
Renewable energy producers

Our expertise

Complete high voltage commissioning capability

One specialist partner across the full HV lifecycle — from 11kV package substations to 132kV bay commissioning — supporting the UK's electrical and renewable energy infrastructure.

HV Commissioning — High Voltage Commissioning

HV Commissioning

Structured management of commissioning activities so high voltage systems are installed, tested and energised safely, on programme and in full compliance with project specification.

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Protection Testing — High Voltage Commissioning

Protection Testing

Relay protection testing that proves systems operate accurately and selectively under fault conditions — settings, functionality, timing and trip paths verified end to end.

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Transformer Testing — High Voltage Commissioning

Transformer Testing

Thorough verification of transformer performance, condition and protection prior to energisation — electrical and functional testing to industry standards.

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Cable Testing — High Voltage Commissioning

Cable Testing

HV cable testing using Very Low Frequency (VLF) equipment for reliable insulation testing on cables up to 33kV, verifying insulation integrity and finding defects before they fail in service.

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Design & Protection Studies — High Voltage Commissioning

Design & Protection Studies

Design and protection grading studies that keep HV systems safe, reliable and fully coordinated with network protection — optimised settings for selective fault clearance and system stability.

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Factory Acceptance Testing — High Voltage Commissioning

Factory Acceptance Testing

FAT confirms reliability and compliance of HV equipment before it leaves the manufacturer — resolving issues early, cutting on-site risk and protecting programme.

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Voltage capability

From 11kV package substations to 132kV bay commissioning

Our engineers work confidently across the full HV range, applying rigorous test and commissioning procedures so that every asset is proven before it is energised.

11kV33kV66kV132kV
  • 11kV package substation commissioning
  • Primary & secondary injection testing
  • Protection, control & SCADA integration
  • 132kV bay commissioning & energisation
Full voltage capability
High voltage ceramic insulators and copper busbars in a substation

Sectors served

Working alongside the teams that keep Britain powered

Our HV commissioning engineers and SAPs work closely with data centres, facilities maintenance providers, independent connection providers and industry-leading renewable energy producers.

Data centres

Resilient HV commissioning and maintenance for mission-critical data centre power, where uptime and evidence of compliance are non-negotiable.

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Independent connection providers

Supporting ICPs to deliver adoptable HV networks — designed, commissioned, tested and energised to DNO and industry standards, first time.

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Renewable energy producers

Commissioning the grid connections behind solar, wind and battery storage so clean generation reaches the network safely and exports on time.

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Facilities maintenance

HV maintenance, senior authorised person cover and protection support for FM providers managing complex industrial, commercial and healthcare estates.

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High voltage commissioning engineers inspecting 11kV switchgear with a tablet

Why HVC

Precision engineering you can energise with confidence

We exist to support the continued growth of the UK's electrical and renewable energy infrastructure — delivering critical projects safely, efficiently and to standard.

Safety & compliance first

Every project is delivered in full compliance with industry standards, with safe systems of work managed by senior authorised persons.

Specialist HV engineers

A focused team of HV commissioning engineers and SAPs — not generalists — with deep experience across the 11kV–132kV range.

Efficient energisation

Rigorous planning and proven commissioning procedures keep critical projects on programme and energised on time.

How we work

A clear path from enquiry to energisation

  1. 01

    Enquiry & scope

    Tell us your voltage range, service need, sector and timeline. We review the scheme and confirm scope.

  2. 02

    Plan & design review

    We align design, protection settings and method statements with industry standards and site constraints.

  3. 03

    Commission & test

    Our engineers carry out injection testing, protection and control checks across the HV assets.

  4. 04

    Energise & handover

    Assets are energised safely under SAP control, with full documentation handed over to your team.

See the full six-stage process

Insights

Field notes from live HV commissioning

Technical articles written by Stuart Banner, CEO — commissioning sequences, protection defects and SAP duties from real UK networks.

All articles
UK 11kV switchgear panels with protection relays and test equipment during high voltage commissioning
Protection 7 min

Protection coordination study UK: catching grading errors on site

Grading errors often appear during commissioning because models, relay files and site wiring do not always match. This article explains practical checks before energisation.

2 August 2026 · Stuart Banner

Transformer and HV switchgear undergoing planned maintenance
Maintenance 6 min

Building an HV maintenance regime that actually reduces outages

Calendar-based HV maintenance often means inspecting the assets that do not need it and missing the ones that do. A regime built around duty, condition and consequence gives you fewer outages for the same spend. Here is how we structure one.

25 July 2026 · Stuart Banner

Protection relay panel under secondary injection testing
Protection 7 min

Five protection settings mistakes we keep finding on UK HV networks

Most protection problems we find during commissioning are not relay faults. They are settings and scheme errors that survived design review and only appear under injection testing. These are the five we encounter most often, and how to find them before energisation.

30 June 2026 · Stuart Banner

FAQ

High voltage commissioning, answered

Common questions about our HV commissioning, maintenance, SAP provision and protection services.

Read the full FAQ

Start an enquiry

Tell us about your high voltage project

A few quick questions help our HV engineers scope your requirement accurately — voltage range, services needed, sector and timeline. We'll come back to you with the right people.

Prefer to talk? Call 0333 335 7513

Email Info@hvcommissioning.co.uk

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