Job Description

We are seeking experienced Principal Engineer – HV Primary Substations to join our growing Transmission & Distribution (T&D;) team. You will play a key role in delivering a range of cable system projects across multiple voltage levels, serving clients including Transmission System Operators, Distribution Network Operators, and private developers worldwide.

Here’s what you’ll do:

In this crucial role, you will be a key member of our Transmission & Distribution team dedicated to leading and engaging with our clients to deliver technically challenging OHL design projects.

Your primary focus in the role of Principal Engineer for HV Primary Substations is to provide project technical support and responsible for design of transmission projects. This team will work on various projects encompassing overhead transmission lines up to 400kV.

Preparation of designs and deliverables related to primary electrical systems for transmission and distribution projects. The tasks may encompass, but are not limited to, the following, depending on project requirements and the design phase:

- Design of primary substation systems, including AIS/GIS configurations, transformer installations, circuit breaker selection, busbar arrangements, switchgear layouts, and disconnectors for voltages up to 400kV.
- Preparation of single-line diagrams (SLDs), general arrangement (GA) layouts, equipment sizing, and equipment layout plans for substations and transmission systems.
- Short-circuit force calculations, busbar sizing, fault current analysis, and equipment protection design, ensuring system stability and protection under fault conditions.
- Design of earthing systems,



including grounding layouts, ground grid system design, and lightning protection systems for substations.
- Design and integration of HVDC and HVAC systems, including converter stations, ensuring compatibility with the overall substation design.
- Development of transformer layouts, including oil containment, busduct routing, and secondary system interfaces.
- Optimisation of substation layouts for new and upgraded substations, considering space constraints, equipment accessibility, and construction considerations.
- Review and development of control and protection systems for primary substations, ensuring coordination with secondary systems and compliance with grid operator requirements.
- Coordination with civil teams to design and integrate foundations, steel structures, and electrical cable routes, ensuring seamless integration with the primary systems.
- Development of equipment specification documents, bill of materials (BOM), and procurement support, ensuring the correct equipment is selected as per project requirements.
- Preparation of electrical interconnection diagrams, termination diagrams, cable schedules, and other supporting documentation for the installation and operation of primary systems.
- Detailed design and review of auxiliary systems, such as cooling systems, auxiliary power supplies, and battery systems for substations.
- Underground cable design, including cable sizing, cable routing, and integration into existing systems, particularly for HV cable systems.
- Coordination with external vendors and contractors to ensure the supply and installation of equipment in accordance with design specifications and project requirements.

📌 Senior/Principal Engineer – HV Primary Substations (Madrid)
🏢 Aecom
📍 Madrid