Haesco Ltd

132kV Disconnector - Upgrade

Disconnector upgrade at 19 different 132kV substations across England and Wales from 2009 to present.

HV primary contact grease was being adversely affected by heavy pollution from an adjacent coal fired power station, causing operating problems on disconnectors situated outdoors. A solution was found that would remove the necessity for grease and therefore remove the pollution problem. At the same time the opportunity was taken to bring the disconnectors up to the latest specification. Due to the tight physical restraints of some 132kV substations, an alternative solution to the use of cranes was developed for the project. A support was designed and engineered to support the busbars rather than completely remove them during the replacement of the fixed contacts.

Upgrade RCP disconnector primary contacts to grease free type
Upgrade RCP disconnector primary contacts short circuit rating from 31.5kV to 40kV
Disconnectors and earth switches are stripped down and a full condition assessment carried out on the component parts, with any worn or damaged parts replaced or reconditioned

Disconnectors fully maintained
Integral earth switches fully maintained
Complete reset and commissioning of both the 132kV disconnectors and earth switches

275kV Switchgear - Upgrade and Refurbishment

Switchgear Disconnector and earth switch refurbishment at a 275kV substation during 2012.

During an SGT replacement the opportunity was taken to refurbish the disconnectors and associated earth switches at the same time. The decision to refurbish rather than replace was taken not only as a cost saving but also for green/environmental reasons

Works were completed on time and on budget. Working adjacent to a National Grid Alliance CDM area, all works were co-ordinated with the Alliance partners ensuring both synergy and safety were not compromised.

Disconnectors and earth switches were stripped down and a full condition assessment carried out on the component parts, with any worn or damaged parts replaced or reconditioned
Disconnectors primary contacts upgraded to grease free type
Earth switch fixed and moving primary contacts replaced
Complete reset and commissioning of the 275kV disconnectors and earth switches

400kV Switchgear Installation

Disconnector and earth switch installation at 2 separate 400kV substations in Scotland, during 2008.

Works were completed on time and on budget, despite works started during the winter months in poor weather conditions. Works were carried out concurrently on 2 sites approximately 20miles apart.

Pre-installed structures were checked for alignment
Switchgear pre-assembled and lifting into place
Disconnectors setup and commissioned
Earth switches setup and commissioned

Maintenance

Haesco Ltd undertakes various high voltage switchgear substation maintenance contracts, up to and including 400kV. Our core of highly skilled technicians inspect and test disconnectors and earth switches at regular maintenance intervals, where potential problems are identified and corrected. The technical helpline is at hand for any potential equipment failure with Haesco staff ready to assist if an emergency ever occurred.

Our maintenance service includes the following;

24hr Emergency telephone support
Emergency call out
Disconnector and Earth Switch inspection and testing
Annual asset survey including site stored spare parts
Organise necessary spare parts if and when required
High voltage technical consultancy
Up to 400kV qualified

Health & Safety expertise