Role Overview
The Secondary Systems Commissioning Engineer is the definitive technical authority responsible for the comprehensive testing, integration, and validation of the low-voltage protection, control, and metering infrastructure that governs the UK’s high-voltage power grid. Operating within complex substations and power generation plants, this role ensures that the “brain” of the electrical network functions flawlessly. The Secondary Systems Commissioning Engineer executes rigorous protection relay coordination, logic verification, and end-to-end integrated testing. By validating communication protocols and ensuring absolute revenue metering accuracy, this role provides the ultimate engineering assurance required to guarantee system safety, regulatory compliance, and the seamless automated operation of critical national infrastructure.
Core Technical Competencies & Industry Standards
The Specialist Technical Edge of a Secondary Systems Commissioning Engineer lies in their rigorous execution of integrated testing and uncompromising protection commissioning. Precision Execution requires the flawless management of relay settings, coordination, and fault simulation, ensuring absolute selectivity, speed, and dependability of the protection scheme. A Critical Operational Success Factor is their technical authority over control systems and metering. Top-tier engineers execute precise logic verification, interlock testing, and HMI validation, guaranteeing functionality, safety, and operability. They also verify metering accuracy and billing integration, ensuring revenue accuracy and regulatory compliance. Furthermore, they drive communication systems validation. They verify protocols, demonstrate network redundancy, and ensure cybersecurity compliance, providing the system integrity and handover confidence required for future expansion and reliable grid operation.
Key Responsibilities
- Protection Commissioning: Downloading settings, executing secondary injection testing, and simulating fault conditions to prove the operating times and coordination of protection relays.
- Control Systems Validation: Verifying complex hard-wired and programmable logic, testing safety interlocks, and demonstrating automated sequence operations.
- Metering Accuracy: Calibrating and verifying the accuracy of tariff metering systems, ensuring seamless communication and billing integration for revenue protection.
- Communication Systems: Testing and validating industrial communication protocols (e.g., IEC 61850, DNP3), demonstrating network redundancy and cybersecurity compliance.
- Integrated End-to-End Testing: Executing comprehensive scenario testing, proving that a fault detected by a sensor correctly triggers a breaker trip and sends an alarm to the remote control centre.
- HMI & SCADA Interface: Validating local Human-Machine Interface screens and ensuring all secondary system data is accurately mapped to the overarching SCADA network.
- Defect Resolution: Identifying logic errors, wiring faults, or protocol mismatches during testing, engineering immediate solutions to maintain the commissioning schedule.
- Documentation Completeness: Compiling exhaustive test records, as-left settings, and redlined schematics to form the definitive handover package for the O&M team.
Essential Qualifications
A Degree (BEng/BSc) or HND in Electrical Engineering or Control Systems is the foundational requirement. The Secondary Systems Commissioning Engineer must possess advanced, certified training on secondary injection test sets (e.g., Omicron, Megger) and a deep understanding of protection relay logic. A valid ECS card and safety passport are mandatory. Candidates must possess profound expertise in reading complex electrical schematics, understanding industrial networking protocols, and navigating high-voltage safety rules.
Desirable Experience
Engineers with proven experience commissioning fully digital IEC 61850 substations—navigating GOOSE messaging and Station Configuration Descriptions (SCDs)—command a massive premium. Experience in advanced metering infrastructure (AMI) and complex revenue protection schemes provides a significant competitive advantage.
Career Progression Pathway
The career trajectory for a Secondary Systems Commissioning Engineer is highly analytical and authoritative. Vertical progression leads to Senior Secondary Systems Commissioning Engineer (acting as the site technical lead for control systems) and Lead Commissioning Engineer. Horizontally, the deep understanding of relay logic and networks allows for transition into dedicated Protection & Control Commissioning Engineer roles or SCADA Commissioning Engineer positions.
How Haupt Recruitment Supports
Haupt Recruitment partners with the UK’s leading Transmission System Operators, DNOs, and specialist testing consultancies. We understand that your validation of secondary systems is the critical “brain” that protects the physical grid. We ensure your specific expertise in integrated testing and protection logic secures you positions on the most critical grid upgrade projects, negotiating premium day rates that reflect your immense technical responsibility.
FAQ Section
What qualifications do I need to become a Secondary Systems Commissioning Engineer?
An Electrical or Control Systems Degree/HND is required, alongside advanced certifications in secondary injection testing, relay logic expertise, an ECS card, and specific utility access tickets.
What is the difference between Primary and Secondary systems?
Primary systems are the massive, high-voltage components (transformers, cables) that carry the actual power. Secondary systems are the low-voltage computers, relays, meters, and wiring that monitor, control, and protect the primary equipment.
Why is metering accuracy a critical part of this role?
Substation meters measure the massive amounts of electricity flowing through the grid, which dictates how millions of pounds are billed between generation companies and the national grid. Even a 0.1% inaccuracy can result in massive financial losses, making the engineer’s calibration and verification absolutely critical for revenue protection.
What is the typical career path for a Secondary Systems Commissioning Engineer?
Progression typically leads to Senior Secondary Systems Commissioning Engineer, Lead Commissioning Engineer, or transitioning into highly specialised Protection & Control or SCADA design roles.
What does integrated end-to-end testing involve?
It is the final proof that all systems work together. The engineer simulates a fault at the sensor level, verifies that the protection relay detects it, confirms the relay sends a trip signal to the circuit breaker, and ensures the SCADA system sends the correct alarm to the remote control room, proving the entire chain functions flawlessly.