NETLUX Enginyeria - Consultoria
High-voltage pylons under a cloudy sky
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High, medium and low voltage

HV/MV/LV Electrical Installations

Detailed design of high, medium and low voltage installations and transformer substations, from the initial study to commissioning.

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Our services

What we do

We offer engineering and consulting services specialising in high, medium and low voltage installation projects, working with both public administrations and private companies.

  • Preliminary technical studies and economic, technical and energy assessment.
  • Detailed design of HV, MV and LV installations, including the required transformer substations.
  • Site supervision and execution, ensuring correct implementation of the installations and compliance with technical, regulatory and quality requirements.
  • Health and Safety Coordination (CSS) during the works, ensuring compliance with current occupational risk prevention legislation.
  • Technical advice and management support at every stage of the project, from initial definition to commissioning of the installations.
  • Support with administrative procedures, permits, legalisation and site management for installations.

Our goal is to design and deliver turnkey projects that meet each client's needs.

Team of engineers wearing hard hats reviewing electrical drawings
Types of installations

From the transmission grid to every load

High voltage (HV)

High-voltage installations are the level of electrical infrastructure used to transmit and distribute power over long distances and to supply large networks and high-power installations. They require a high degree of specialisation in electrical sizing, protection systems, safety and grid coordination.

We start by analysing power requirements and connection conditions to define a solution that ensures safety, reliability and continuity of supply.

We develop the project end to end: solution study, calculations and sizing, protection and switching systems, electrical diagrams, technical documentation and permits. This is particularly relevant for energy infrastructure, high-power industry, distribution networks and power generation projects.

Trench with ducts for underground power lines

Medium voltage (MV)

Medium-voltage installations distribute power between the distribution network and points of consumption, adapting supply to the power needs of each installation.

They are common in industrial estates, factories, large commercial buildings, infrastructure, renewable generation plants and large consumers, where a private MV network and often a transformer substation are required.

We define the network architecture, feeders, protection and switching cells, metering systems, protections and earthing, from initial definition to legalisation and commissioning, in coordination with the distribution company.

Electrical room with transformer and medium-voltage switchgear

Low voltage (LV)

Low voltage distributes power to loads and equipment through switchboards, circuits, cable routes and protection systems: machinery, motors, HVAC, lighting, auxiliary equipment or electric vehicle chargers.

The infrastructure must deliver power to each load under the right conditions, maintaining the required levels of safety, protection, quality and continuity of service.

We design new installations, extensions and refurbishments: sizing of circuits and protections, switchboards and cable routes, electrical calculations and documentation for execution and legalisation. We take a holistic approach, allowing for future extensions, new loads and the addition of generation and energy efficiency measures.

Inside a transformer substation with switchgear cells and panels

Transformer substations

A transformer substation steps medium voltage down to low voltage to supply the installation's equipment. It is one of the key points of a large consumer's electrical infrastructure and requires careful specification of the transformer, MV cells, protections, LV switchboards and earthing systems.

We design new substations, extensions, refurbishments and upgrades of existing installations, studying the required power and the characteristics of the supply.

We integrate all the disciplines involved —civil works, protections, ventilation, safety and metering— to deliver a safe, accessible, maintainable solution adapted to the client's current and future needs.

Prefabricated transformer substation installed outdoors
Methodology

Our phased engineering service model

Our way of working is structured in phases that allow us to offer a comprehensive service, from the initial analysis to project follow-up after completion, ensuring technical, administrative and financial control throughout the process.

  1. Assessment and feasibility analysis

    Kick-off meetings, collection of consumption data, analysis of consumption and service parameters and of the electrical grid, preliminary economic study, risk identification and feasibility report.

  2. Solution design

    Sizing and calculation of the installations, equipment specification, single-line diagrams, preliminary design and preliminary budget.

  3. Funding, grant management and justification

    Where grants are available: preparation of reports and budgets, administrative procedures and responses to requests for information.

  4. Detailed design

    Technical report, electrical and structural calculations, bill of quantities, specifications, budget, construction drawings and BIM/CAD coordination.

  5. Permits and legalisation

    Building permit, administrative authorisation, grid connection, industry and environmental authorities, fire service if applicable, and certifications.

  6. Tendering and contracting

    Tender documents, award criteria, responses to queries, bid evaluation, technical reports and support for contract award.

  7. Site supervision and monitoring

    Site meetings, visits, progress certifications, quality control, cost control, variations, minutes and coordination with the contractor.

  8. Commissioning

    Test protocols, commissioning, regulatory inspections, final documentation and support for final connection and legalisation.

  9. Financial close-out and final handover

    As-built report, drawings, invoice collection, certifications, indicators, final report and responses to requests for information.

Engineering and consulting

Let's talk about your project

If you are considering new high, medium or low voltage infrastructure, we offer an initial technical and economic feasibility assessment with no obligation. Get in touch to define a scope and budget tailored to your area or organisation.

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