Offshore High Voltage Services
HVS provides specialized Offshore HV Services designed to meet the complex demands of marine and offshore electrical installations. Our experienced engineers handle everything from cable terminations to full substation commissioning, ensuring safety, reliability, and compliance with industry standards.
ABOUT
Offshore High Voltage (HV) Services You Can Rely On
We work closely with offshore operators, wind farms, and marine projects to deliver solutions that maximize uptime, maintain asset integrity, and streamline operational performance. Our team is trained for high-risk environments and is equipped with advanced tools for accurate testing, installation, and maintenance.
Cable Services
- HV Safety Management & Permit-to-Work Control
- Cable Route, Pull-in & Lay Support (Vessels, OSS, WTGs, J-Tubes)
- Fault Location, Investigation & Cable Repair Campaigns
- Offshore Cable Termination & Jointing (Array, Export, and Interlink Cables)
Substation & Equipment Services
- Offshore Substation Installation, Testing & Commissioning
- Transformer, Switchgear & Protection System Maintenance
- High Voltage Switching & Isolation (up to 66kV)
Testing & Monitoring
- Technical Documentation, Reports & Certification Support
- Asset Integrity & Condition Monitoring
- Offshore Earthing, Bonding & Continuity Testing
- Pre-Commissioning & Post-Installation Testing (VLF, Sheath, Insulation, TDR)
Operational & Maintenance Services
- De-energisation, Decommissioning & Recovery Operations
- Planned & Corrective Maintenance (WTG, OSS, and Landfall)
- Temporary Power & Energisation Solutions
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Offshore Cable Termination & Jointing
HVS specializes in offshore cable termination and jointing for array, export, and interlink cables. Our certified engineers ensure each termination and joint is performed with precision, maintaining full integrity and reliability under challenging offshore conditions. We use advanced tools and proven techniques to guarantee high-quality connections that meet international standards.
From initial cable handling to final testing, we manage the entire process with strict safety protocols. This approach minimizes the risk of faults, extends cable lifespan, and ensures consistent power transmission across your offshore installations.
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High Voltage Switching & Isolation (up to 66kV)
HVS provides expert high voltage switching and isolation services for systems up to 66kV, ensuring safe and reliable operation of offshore electrical networks. Our certified engineers follow strict protocols to perform switching operations, minimizing risks to personnel and equipment while maintaining continuous power supply where possible.
We handle both planned and emergency switching tasks with precision, using advanced tools and monitoring systems. This ensures system stability, protects critical assets, and reduces the likelihood of unplanned downtime, keeping your offshore operations efficient and secure.
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Pre-Commissioning & Post-Installation Testing
HVS provides comprehensive pre-commissioning and post-installation testing of offshore cables using advanced techniques such as VLF (Very Low Frequency), sheath testing, insulation testing, and TDR (Time Domain Reflectometry). These tests ensure that all cable installations meet stringent performance, safety.
Benefits:
1. Early Fault Detection
Identify cable or system defects before energization, preventing costly failures and downtime.
3. Safety Compliance
All testing follows strict industry standards, protecting personnel and equipment.
2. Enhanced System Reliability
Ensure consistent and stable power transmission across offshore installations.
4. Extended Asset Lifespan
Regular and accurate testing helps maintain cables and equipment for long-term performance.
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Cable Route, Pull-in & Lay Support
Key Services:
1. Precise Fault Detection
Utilizing advanced diagnostic equipment, we accurately locate faults in offshore cables, reducing time and effort.
2. Comprehensive Investigation
We analyze and determine the root causes of cable issues to prevent recurring problems and ensure system stability.
3. Rapid Cable Repair Campaigns
Advanced diagnostic and testing equipment used to maintain peak systemOur team conducts fast and efficient repair operations to minimize downtime and restore full operational performance.
4. Preventive Recommendations
We provide actionable guidance to prevent future faults, extending cable lifespan and improving long-term reliability.
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Fault Location, Investigation & Cable Repair Campaigns
HVS provides comprehensive pre-commissioning and post-installation testing of offshore cables using advanced techniques such as VLF (Very Low Frequency), sheath testing, insulation testing, and TDR (Time Domain Reflectometry). These tests ensure that all cable installations meet stringent performance, safety.
Key Services:
- Mobilize pull-in operations
- Prepare vessels and equipment
- Survey and map cable route
- Test and ensure compliance
- Inspect placement
- Lay cables precisely
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Temporary Power & Energisation Solutions
HVS provides comprehensive pre-commissioning and post-installation testing of offshore cables using advanced techniques such as VLF (Very Low Frequency), sheath testing, insulation testing, and TDR (Time Domain Reflectometry). These tests ensure that all cable installations meet stringent performance, safety.
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Transformer, Switchgear & Protection System Maintenance
HVS offers comprehensive maintenance services for transformers, switchgear, and protection systems to ensure reliable offshore operations. Our certified engineers perform inspections, testing, and preventive maintenance, keeping equipment safe, efficient, and compliant with industry standards.
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Offshore Earthing, Bonding & Continuity Testing
HVS provides specialized offshore earthing, bonding, and continuity testing to ensure the safety and reliability of electrical systems. Proper earthing and bonding prevent electrical faults, reduce the risk of equipment damage, and protect personnel working in harsh offshore environments.
Our certified engineers perform comprehensive testing and verification of all connections, ensuring continuous electrical integrity across platforms, WTGs, and offshore substations. These services help maintain compliance with international safety standards while supporting long-term operational performance. From initial cable handling to final testing, we manage the entire process with strict safety protocols. This approach minimizes the risk of faults, extends cable lifespan, and ensures consistent power transmission across your offshore installations.
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Asset Integrity & Condition Monitoring)
HVS offers advanced asset integrity and condition monitoring services for offshore electrical systems, ensuring that all equipment operates safely and efficiently. Our team uses the latest diagnostic tools to assess the health of transformers, switchgear, cables, and other critical infrastructure, detecting potential issues before they become major problems.
By continuously monitoring system performance and identifying early signs of wear or degradation, we help clients optimize maintenance schedules, extend asset lifespan, and reduce the risk of unplanned downtime. This proactive approach enhances operational reliability and supports long-term offshore project success.
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HVS offers comprehensive planned and corrective maintenance services for wind turbine generators (WTG), offshore substations (OSS), and landfall infrastructure, ensuring the long-term reliability and efficiency of offshore electrical systems. Our proactive maintenance programs are designed to prevent unplanned downtime, extend asset lifespan, and optimize operational performance. For corrective maintenance.
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De-energisation, Decommissioning & Recovery Operations
HVS provides expert de-energisation, decommissioning, and recovery services for offshore high voltage systems, ensuring safe and efficient removal or shutdown of equipment at the end of its operational life. Our certified engineers follow strict safety protocols to isolate energy sources, dismantle infrastructure, and recover valuable assets while minimizing environmental impact. We carefully plan and execute each operation to maintain compliance with regulatory standards and protect both personnel and equipment.
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HV Safety Management & Permit-to-Work Control
HVS ensures strict high voltage safety management and permit-to-work control across all offshore operations. Our certified engineers implement robust safety protocols, monitor compliance, and manage permits to protect personnel, equipment, and assets, reducing risks and ensuring that all work is performed safely and efficiently.
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Technical Documentation, Reports & Certification Support
HVS provides comprehensive technical documentation, reporting, and certification support for all offshore high voltage projects. Our team ensures that every installation, test, and maintenance activity is fully documented, supporting regulatory compliance, audit requirements, and long-term operational transparency.
Key Services:
- Certification of compliance with industry standards
- Documentation for testing, inspections, and commissioning
- Record-keeping to support audits and future project planning
- Detailed technical reports for all installations and maintenance
