Electrical Systems Inspection, Measurements and Repairs
Comprehensive electrical service for wind turbines – from installation inspections and circuit measurements to converter repairs and substation maintenance. All services performed by qualified technicians with LV/MV/HV certifications according to OEM procedures and safety standards.
Keeping your turbines running through expert electrical service
The electrical system is the nervous system of every wind turbine. From control cabinets through converters to generators, each component must function reliably under demanding conditions – variable loads, harsh environments and continuous operation.
Our electrical service team specialises in both routine measurements and complex troubleshooting. We perform comprehensive diagnostics to identify developing faults before they cause failures, and execute targeted repairs that restore optimal performance. When component replacement is necessary, we ensure correct installation according to OEM specifications.
Comprehensive electrical service capabilities
Installation Inspection Service
Installation inspections verify that all electrical systems have been correctly installed, connected and configured before turbine commissioning or after major component replacements.
Inspection scope:
• Control cabinet wiring verification and torque checks
• Converter connection integrity and phase sequence
• Generator terminal box inspection
• Transformer tap settings and protection relay configuration
• Grounding system continuity and resistance measurements
• Lightning protection system verification
• Aviation lighting functionality and compliance
• Cable routing, bend radii and strain relief
• Labelling accuracy and documentation completeness
All inspections follow manufacturer-specific checklists and regulatory requirements to ensure installations meet safety and performance standards before energisation.
Circuit Measurement Service
Circuit measurements provide quantitative data on electrical system health, enabling early detection of insulation degradation, connection problems and developing faults.
Measurement services:
• Insulation resistance testing (IR) – generator windings, cables, transformers
• Polarisation index (PI) measurements for insulation condition trending
• Winding resistance measurements for connection integrity
• Power quality analysis – harmonics, voltage imbalance, power factor
• Thermographic surveys – control cabinets, connections, transformers
• Earth loop impedance and protective device testing
• Continuity testing of protective conductors
• Phase sequence verification
• Current and voltage measurements under load
All measurements are documented with trending capability for comparison against baseline values and early identification of deteriorating conditions.
Equipment Repair Service
Electrical equipment repairs address specific faults identified through diagnostics or operational issues, restoring system functionality while minimising turbine downtime.
Repair capabilities:
• Control cabinet component replacement – contactors, relays, circuit breakers
• Generator slip ring and brush gear servicing
• Pitch motor and drive repairs
• Yaw motor and brake system electrical repairs
• Capacitor bank replacement
• Cable termination and joint repairs
• Connector replacement and re-crimping
• Control system software updates and parameter adjustments
• Sensor and transducer replacement
Our technicians carry common spare parts and diagnostic equipment to enable rapid fault resolution during site visits.
Measurements and repairs across all electrical systems
• Low Voltage (LV) – up to 1 kV
• Medium Voltage (MV) – 1–36 kV
• High Voltage (HV) – above 36 kV
• Generator systems (typically 690V)
• Control circuits (24V DC, 230V AC)
• Auxiliary power systems
• Substation equipment
• Grid connection points
• Insulation resistance testers (up to 10 kV)
• Micro-ohm meters for contact resistance
• Power quality analysers
• Thermal imaging cameras
• Earth resistance testers
• Phase rotation meters
• Current clamps and multimeters
• Oscilloscopes for waveform analysis
• Lightning protection verification
• Earthing system testing
• RCD/RCBO functionality checks
• E-stop circuit verification
• Arc flash assessments
• LOTO procedures compliance
• Protection coordination studies
• Safety interlock testing
Expert service for wind farm substations
We provide comprehensive substation inspection and maintenance services ensuring reliable power export and compliance with grid connection requirements. Our team is qualified for MV and HV switching operations.
Comprehensive substation inspection and maintenance ensuring reliable power export and grid compliance.
Inspection scope:
• MV/HV switchgear inspection
• Transformer oil sampling and analysis
• Protection relay testing
• Circuit breaker timing tests
• Busbar joint thermography
Work includes visual inspection, diagnostic testing, maintenance activities and complete documentation with recommendations.
Converter diagnostics and repairs for all major turbine platforms, critical for power conversion reliability.
Indications for service:
• Fault codes and alarms
• Reduced power output
• Abnormal operating temperatures
• Power quality issues
• Component failure warnings
We perform converter module replacements, parameter adjustments and system testing to restore optimal operation.
Structured methodology for reliable results
Our electrical service follows a systematic approach ensuring quality and safety:
1. Safety preparation
LOTO procedures, isolation verification, permit-to-work documentation, voltage testing to confirm de-energisation
2. System assessment
Visual inspection of electrical systems, identification of damage or contamination, initial measurements to establish baseline conditions
3. Diagnostic testing
Comprehensive electrical measurements following manufacturer protocols and industry standards, digital recording for trending and reporting
4. Fault identification
Analysis of measurement data against acceptance criteria, root cause analysis, determination of corrective actions
5. Repair or replacement
Component repair where feasible, new part installation per OEM specification, torque verification, connection testing
6. Verification and documentation
Post-repair measurements, functional testing under load, complete service documentation with recommendations
Electrical service for turbines from leading OEMs
Qualified team for safe electrical work
All electrical service is performed by personnel holding:
• GWO Certifications
BST (Basic Safety Training), BTT-Electrical (Basic Technical Training), ART (Advanced Rescue Training) – complete package for wind turbine work
• Electrical Qualifications
Low Voltage (LV), Medium Voltage (MV), High Voltage (HV) certifications, switching authorisation for MV/HV systems
• OEM Training
Manufacturer-specific training including Vestas, Siemens Gamesa, GE and Enercon electrical systems
• Specialist Certifications
Thermographic inspection certification, power quality analysis training, arc flash awareness
• Safety Training
LOTO procedures, electrical safety rules, first aid and rescue techniques
Need electrical service for your turbines?
Contact us to discuss your electrical service requirements. We offer rapid response for urgent repairs and flexible scheduling for planned maintenance across Central and Western Europe.