High Voltage Lab Testing Services
Maximum impulse voltage: 3200 kV
Maximum 60 Hz voltage: 800 kV
Maximum DC voltage: 1000 kV
The services offered by High Voltage Laboratory include:
- Standard high voltage testing
- Testing and evaluation of porcelain, glass and composite insulators (withstand and flashover, puncture, electromechanical and steep front tests)
- Testing of bushings
- Testing of switchgear, disconnecting switches and circuit breakers
- Testing and commissioning of power cables
- Testing of distribution and power transformers (partial discharge and impulse tests)
- Testing of power cable accessories
- Testing of SF6 insulated equipment
- Testing and evaluation of instrument transformers
- Radio interference voltage (RIV) testing of equipment
- Partial discharge testing of equipment
- Evaluation and analysis of transformer condition and faults
- Transformer winding movement monitoring
- Line and bus hardware evaluation
- Certification tests on aerial devices (bucket trucks) for live-line work
- EMF calculation, analysis and consultation
- EMF field measurement
- Electromagnetic interference testing and consultation
- Field testing: substation equipment
- Transient measurement for transmission and distribution system
Tests Performed
The High Voltage Laboratory offers the following major test categories:
- Conformance to standards
- 60 Hz dry & wet voltage withstand test
- 60 Hz dry & wet voltage flashover test
- Lightning impulse voltage withstand test (full and chopped wave)
- Lightning impulse voltage flashover test (standard & steep front)
- Switching impulse dry & wet voltage withstand test
- Switching impulse dry & wet voltage flashover test
- DC (direct current) voltage withstand test
- DC (direct current) voltage flashover test
- Radio Influence Voltage (RIV) test
- Partial discharge test
- Corona test (electrical and visible image intensifier detection)
- Capacitance and tan delta measurement
- Insulation AC/DC watts loss test
- Low voltage impulse (LVI) test (Laboratory and on site)
Test Facilities
Indoor HV lab dimensions:
- 43 m (140 ft)(l) x 37 m (120 ft)(w) x 21 m (70 ft)(h)
Outdoor Test Area
- two acres
- 500 kV Inverted Delta Transmission Line - 180 m (590 ft)
AC Test Equipment
- Resonant test set: 800 kV (two modules in cascade, 400 kV each)3.2 A cont.
- Test transformer: 90 kV, 1.33 A Cont.
- Test transformer: 600 kV, 700 mA cont.
- Test transformer: 100 kV, 60 mA cont.
- 5 MVA, 60 Hz motor generator
- 1 MVA, 320 Hz motor generator
- 75 kVA, 400 Hz motor generator
- Capacitive voltage divider: 800 kV
- Damped capacitive voltage divider: 500 kV
- Mixed (R,C,R) voltage divider: 380 kV
- Partial discharge detector
- Radio interference voltage (RIV) meter
- Image intensifier (visible corona detector)
Impulse Voltage Test Equipment
- Impulse generator: 3.2 MV, 225 kJ
- Impulse generator: 500 kV, 5 kJ
- Damped capacitive voltage divider: 2.6 MV/2.0 MV (lightning/switching impulse)
- Mixed (R,C,R) voltage divider: 2.0 MV/1.5 MV (lightning/switching impulse)
- Mixed (R,C,R) voltage divider: 300 kV/250 kV (lightning/switching impulse)
- Resistive voltage divider: 500 kV
- High-resolution digital recording system
- Digital oscilloscope
- Storage analogue oscilloscopes
DC voltage test equipment
- DC generator: 1000 kV, 10 mA
- DC generator: 100 kV, 100 mA
- Resistive voltage divider: 1000 kV
- Mixed (R,C,R) voltage divider: 450 kV
- Mixed (R,C,R) voltage divider: 200 kV
- Resistive voltage divider: 100 kV