Test & Protection
All job specific ITP’s, check sheets and test sheets will be provided for client approval where required prior to starting any works. Client supplied QA documentation will be utilised where preferred by the client.
The lists below are headers only and do not name each specific test for each piece of equipment. All tests are implied and will be completed as required by the agreed specific tests in the relevant ITPs and specification.
Each site will be tested to the highest standards and will be fully fit for purpose before energisation.
Level One Testing (Panel wiring, inter panel wiring and panel equipment checks)
Point to point testing including drawing highlighting and drawing signing off for record purposes
Tightness of all terminals and wire pull checks
Correctness checks of all ferrule markers, labels, installed equipment and equipment ratings.
Secondary wiring insulation resistance tests
Secondary earthing including single point earthing checks on CT circuits
Polarity checks on all AC and DC secondary circuits
Level Two Testing (Site Acceptance Testing of HV, MV and LV primary plant)
Current transformer tests including nameplate data collection and comparison with design requirements.
Voltage transformer tests including nameplate data collection and comparison with design requirements.
Power transformer tests excluding frequency response analysis
Single pole and three pole circuit breaker testing
Capacitor Bank and reactor testing
Filter Bank testing
Isolator, earth switch, surge arrestor testing
Cable testing (higher voltage VLF testing may require specific test equipment)
Contact and joint resistance tests on cable ends, earth grid risers, busbars and circuit breakers
Insulation resistance tests
Level Three Testing (Relay logic, analogue inputs, digital I/O, relay characteristics of all applied settings and relay related SCADA testing)
Non-directional and directional overcurrent, earth fault and sensitive earth fault
High and low impedance restricted earth fault
Transformer protection
Generator protection
Cable/line differential protection
Busbar protection schemes
Distance protection and schemes
Auto reclose and distance to fault location
All settings compared to latest settings report
Level Four Testing (Complete integration testing of tested equipment to ensure fit for purpose plant)
Primary current injection to check relay displays including CT summation checks
Primary voltage injection to check relay displays and live indicators
Complete tests to check entire SCADA points list
Integration of relay binary inputs and outputs
Compete tripping checks including circuit breaker fail and trip circuit supervision
Complete closing checks including close circuit supervision
Heater and fan checks
Primary operating current checks on busbar protection schemes
All mechanical and electrical interlocking schemes
LV automatic changeover systems including the integration of the local standby generator
Find out how we can help you
We’ve got the experience, the knowledge and the runs on the board to get the most challenging projects done. Get in touch to find out how we can help.
