We have experience with over 5,000 retrofit installations and can offer the complete package from initial consultation, to choice of circuit breakers, to final removal and disposal of the original breakers via fully licensed means.
In particular we have extensive knowledge of Brush Switchgear type VSI (single busbar), VTD (double busbar) ranges and South Wales Switchgear type C/D ranges of retrofits with unparalleled knowledge of the original fixed portions of switchgear.
Taking advantage of individual circuit outages, we can:
- Convert existing oil filled VT's to cast resin VT's
- Upgrade existing current transformers to suit better protection and metering
- Alter protection relays from electromechanical to electronic
- Supply and install telecontrol facilities for remote control and indication or provide differing forms of remote switching operations to suit clients needs
We are also able to retrofit the following types of equipment:
- Brush Switchgear VBA/VBC/VBAD/VBCD
- Reyrolle LMT, LMT23T, LMT2 ranges
- GEC BVRP17 and AEI BVRP
For all retrofits offered, the circuit breakers have been fully type tested to IEC60056 or IEC62271. The certified ratings are:
Rated Voltage |
12/13.8 kV |
Rated Current |
400A- 1250A, & 2000A |
Frequency |
50/60 hz |
Symmetrical breaking current |
25kA, 31.5kA or 40kA |
Rated making current |
62.5kA, 78kA or 110kA |
Rated Power Frequency withstand |
28kV/36kV |
Basic Impulse level
|
75/95kV |
Short time current (3secs)
|
25kA , 31.5kA or 40kA |
Relevant Case studies:
Guernsey Electricity
Associated British Ports