High Voltage (HV) Switchgear Retrofit

High Voltage (HV) Switchgear Retrofit

Electrical switchgear and safety is at the forefront of any operational site and the advice given by the HSE will help you to keep your electrical switchgear safe and comply with The Health and Safety at Work etc Act 1974, the Management of Health and Safety at Work Regulations 1999 and the Electricity at Work Regulations 1989.

As detailed by the HSE, “In general, HV switchgear has a proven record of reliability and performance. Failures are rare but, where they occur, the results may be catastrophic. Tanks may rupture and, with oil-filled switchgear, this can result in burning oil and gas clouds, causing death or serious injury and major damage to plant and buildings in the vicinity. Failures of switchgear can also result in serious financial losses”.

Retrofitting old oil insulated switchgear is a proven highly cost-effective and reliable process which once installed reduces HV maintenance and the overall operational costs of sites by means of reducing shut down times and ultimately improving existing system reliability and operational safety.

As an independent supplier, SPEC Limited can offer via its Q/A approved chain, new withdrawable Retrofit Vacuum Circuit Breakers type tested to IEC 60056 or IEC62271, which will directly replace existing truck mounted Oil Circuit Breakers, whilst retaining the existing fixed housings and main power cables which in turn vastly reduces outages and eliminates costly civil works. No busbar outages are required to conduct the retrofits.

We have vast experience of retrofitting oil circuit breakers globally, with over 5,000 retrofits having been conducted.

Whilst undertaking this work on site SPEC Limited can supply new Retrofit Protection Panels covers that can be manufactured with new wiring looms ready to be fitted on site under the self same outage.

SPEC Limited namely supply Retrofit trucks for manufacturers and types as detailed below:

  • Brush Switchgear VSI/VTD range
  • South Wales Switchgear C/D range
  • Reyrolle Switchgear LMT range
  • GEC Switchgear BVP range.

Many other OEM retrofits are possible – details available from Head Office.

  • Up to 13.8 kV
  • Up to 1250 A
  • 25 kA (3 sec duty)
  • Up to 95 kV BIL

Retrofit vcb’s for Brush Switchgear VSI/VTD range are available up to 2500A, 31.5Ka.


  • Converting existing Oil filled VTs with cast resin VTs.
  • Complete extension panels (single or double busbar) with vertically isolated VCB without the need for busbar adaptor chambers/joggle chambers.
  • Supply and install telecontrol facilities for remote control and indication.
  • Upgrade existing current transformers to suit better protection and or metering.
  • Alter Protection relays from Electromechanical to electronic to ensure the performance, safety and longevity of your system can be significantly improved
  • If full telecontrol not required, remote operation (outside of substation) can be provided.
  • Disposal of your OCBs via means that are fully compliant with ISO 14001.

24/7 call out service.
Available 365 days of the year.