Electrical Test Engineer

We are seeking an experienced Site Electrical Testing Engineer to join our Operations team. This is a predominantly site-based role requiring regular travel throughout the UK and, when required, internationally.

The Role

Reporting to the Head of Site Services, you will be responsible for the testing, commissioning, maintenance, and support of transformers and associated equipment on customer sites.

This is a hands-on position involving electrical testing, mechanical assembly, fault diagnosis, and maintenance activities. The successful candidate will demonstrate strong technical competence, excellent safety awareness, and the ability to work independently in demanding site environments.

Key Responsibilities

• Lead and carry out on-site transformer testing and commissioning activities.
• Perform mechanical assembly and installation of transformers and associated equipment.
• Conduct fault-finding, diagnostics, and repair work.
• Undertake transformer maintenance activities.
• Read and interpret technical drawings and electrical schematics.
• Complete testing documentation and reports accurately.
• Ensure compliance with site RAMS (Risk Assessments and Method Statements) and Health & Safety requirements.
• Represent the company professionally when interacting with customers and stakeholders.
• Travel regularly to customer sites across the UK and overseas as required.

Transformer Testing Responsibilities

Power Transformers

Carry out testing and commissioning activities including:

Insulation Resistance Testing

HV Withstand Testing

Transformer Ratio Testing (TTR)

Sweep Frequency Response Analysis (SFRA)

Winding Resistance Testing

HV and LV Current Transformer (CT) Testing

Bushing Testing, including Tan Delta measurements

Tap Changer Checks

Buchholz Relay Alarm and Trip Testing

Oil Temperature Indicator (OTI) and Winding Temperature Indicator (WTI) Calibration

Pressure Relief Device (PRD), Magnetic Oil Gauge (MOG), Air Bag Relay and Oil Surge Relay Functional Checks

Marshalling Box Testing

Cooling System Checks (including fans)

Rupture Detector Relay Testing

Impact Recorder Results Review

Oil Sampling, including pre- and post-circulation analysis

Ashridge Monitoring System setup and testing

Distribution Transformers

Carry out testing including:

Insulation Resistance Testing

Applied Voltage / HV Withstand Testing

Winding Resistance Testing

Transformer Ratio Testing

Vector Group Verification

HV and LV CT Testing

Marshalling and Control Wiring Checks

Functional Testing of Auxiliary Equipment:

Breathers

Oil Temperature Indicators (OTI)

Winding Temperature Indicators (WTI)

Magnetic Oil Gauges

Buchholz Relays

Pressure Relief Devices

Pressure and Vacuum Gauges

Additional Site Responsibilities

Mechanical Assembly

• Installation of radiators, conservators, and cooling systems.
• Mounting HV and LV bushings and tap changers.
• Gasketing and sealing to prevent oil leaks.
• Installation of marshalling boxes, cable trays, and accessories.
• Torque checking of mechanical fixings.

Electrical Assembly

• Termination of internal and external wiring.
• Installation and wiring of control and protection devices.
• Functional testing of alarms and trip circuits.

Maintenance and Refurbishment

• Oil draining, filling, and filtration support.
• Replacement of gaskets, seals, and breathers.
• Inspection and upgrading of transformer accessories.
• Oil sampling for laboratory analysis.

Site Safety and Compliance

• Establishing safe working areas and site barriers.
• Following approved RAMS and site safety procedures.
• Safe use of lifting and rigging equipment.
• Reporting hazards, near misses, and incidents.

Knowledge, Skills and Experience

Essential Requirements

Proven experience in electrical testing within an engineering environment.

Demonstrable experience in transformer testing and commissioning.

Experience working in site-based engineering roles and live electrical environments.

Relevant electrical qualifications.

Strong knowledge of electrical regulations and industry standards.

Ability to read and interpret electrical drawings and schematics.

Sound understanding of Health & Safety requirements and safe systems of work.

Strong attention to detail and a methodical approach to work.

Good communication skills.

Ability to work independently and manage site activities effectively.

Flexibility and willingness to travel extensively.

Salary and Benefits

Competitive salary (dependent on experience).

25 days annual leave plus bank holidays.

Quarterly company profit share scheme.

Healthcare cash plan.

Employee Assistance Programme (EAP).

Electric Vehicle (EV) salary sacrifice scheme.

On-site EV charging facilities.

Company pension scheme.