Prague - Běchovice 27.10, 2009
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Testing laboratory
» REVIEW OF ACTIVITIES
» FACILITIES
Contact
Jan Bolech, bolech@egu-vvn.cz, +420606605098
Reviev of activities
Tests at HV laboratory
The test equipment of the HV Laboratory makes possible to carry out following tests of HV equipment with system voltage up to 420 kV:
- dielectric tests of HV and UHV insulators, insulator strings, post insulators, switchgears, disconnectors, etc.
- artificial pollution tests of suspension and post insulators
- design and type tests of composite insulators
- type tests of ceramic and glass insulators
- tests of surge arresters
- tests of instrument transformers
- measurements and tests of bushing and capacitors
- tests of power transformers and reactors
- tests of cables and cable terminals and joints
- tests of gas insulated switchgears (GIS)
- radio interference voltage and corona tests on insulator string and electric equipment
- partial discharges measurements on HV devices with internal insulation
Field test and measurements
- measurement of switching overvoltages
- partial discharge measurements of surge arresters and instrument transformers
- measurements of pollution degree and measurements of pollution state of external insulation
- interfering electromagnetic field measurements in the range of 0,15 - 300 MHz along UHV overhead lines and substations (interference source searching)
Facilities
Main testing parameters:
Small hall
| AC testing voltage 50Hz | Test transformer: 250kV, 1A |
| LI testing voltage 1,2/50μs | Impulse generator: 750kV, 30kJ |
Large hall
| AC testing voltage 50Hz | Test transformers: 1200 kV, 1,2A; 500 kV, 6A; 200 kV, 10A |
| LI testing voltage 1,2/50μs | Impulse generator: 2500 kV, 100 kJ, up to 2200 kV |
| SI testing voltage 250/2500μs | Impusle generator: 2500 kV, 100 kJ, up to 1600 kV |
| DC testing voltage | up to 300 kV, 50 mA |
Auxiliary equipment
| Thermo-mechanical test chamber | Dimensions: 600 x 600 x 3000mm Temperature: -60 ÷ +100°C Maximum tensile load: 320 kN Maximum cantilever load: 50 kN Adjustable heating and cooling periods |
| Salt fog chamber | according to Publication IEC 60507 (up to 250 kV) |
| Oil tanks | tests of the bushing even under rain |
| Chamber for thermal-mechanical test: | -50 ÷ +50°C |
| Artificial rain equipment | according to Publication IEC 60-1/89 |
| Two chambers for long duration salt fog test | up to 50 kV |
| Equipment for tracking wheel test | up to 50 kV |
| Equipment for mechanical and electromechanical tests | up to 200 kN, 200 kV |