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Installation, Maintenance and Testing  Hornbill provide highly qualified experienced HV engineers throughout the UK. Voltage can range from LV up to and including 400KV Nation Grid Networks. We offer assistance on small projects to full turnkey positions, such as professional services for the generation and distribution networks including private sites. Transformers Installation, maintenance and testing of all transformers; from distribution to generation. Tap changer maintenance and repairs. Diverter maintenance and repairs. Supply and installation of anti-condensation equipment including breathers. Supply and installation of any monitoring and protection equipment. Supply of oil filtration equipment including oil replacement and diagnosis. On site mineral insulating oil PCB testing. Installation, repairs and testing of earthing equipment including dry and liquid resistors.
 Protection and Monitoring Equipment Design, installation and testing of complete protection systems. Secondary and primary injection. Relay annual trip testing and fault diagnosis.
 Switchgear and Circuit Breakers Full installation, testing and repairs of both LV and HV switchgear. MCC design and manufacturing. Annual inspections. Full maintenance and testing of circuit breakers up to 400KV including oil, SF6, Air Blast and Vacuum.
 Senior Authorised Persons Project Management and Design
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High Voltage 
