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Technical services,
Commissioning,
maintaining and repairing protection and control schemes to exacting
standards
High voltage grid substation protection, intricate generator protection and
feeder protection at a distribution substation
Our engineers are highly equipped to tackle all protection systems, from
simple electro-mechanical relays to the latest, increasingly complex, numerical
relays
Effective testing on manufacturer’s equipment, including ALSTOM (GEC), English
Electric, Reyrolle, Metropolitan Vickers, Siemens and ABB
Both new and old installations can have an effective maintenance programme
applied to them
New installations or modification of existing sites, including upgrading, commissioning
or inspection of sophisticated control schemes
‘Turnkey packages’ from the planning stage through to installation
and full commissioning tests, handing over schemes fit and ready for service
Specific
testing and commissioning
Generator, transformer, motor, feeder and switchgear protection schemes
Specific testing and commissioning
Directional overcurrent and directional earth fault relays
Auto reclosing schemes – from the very complex to simple schemes
Loss of supply – auto closing
Intertripping G59 – generator protection testing over and under voltage,
over and under frequency, loss of mains etc
Generator protection schemes
Pole slipping neutral voltage displacement
Overcurrent (or voltage dependant) earth fault
Reverse power loss of excitation
Negative phase sequence, rotor earth fault, differential etc
Over and under frequency
REG 216 and 316
Transformer protection schemes
Differential (2 or 3 terminal), HVREF LVREF
Buchholz overcurrent earth fault, standby earthfault etc
MIDOS MCGG, CAG etc
MICOM P441, P122 etc
MICROTAP and SUPERTAP
Motor protection
Thermal relays etc
Switchgear
CT’s – mag curves and primary injections
VT’s – ratio and polarities pressure testing
All incomer and feeder protection including unit protection
