27.02.2011
Produkt and Technology Exhibition

EGU - HV Laboratory a.s. will participace on Produkt and Technology Exhibition organised during INMR World Congress on Insulators, Arresters, Bushings & Cable Addessories in Seoul, Korea on April 17 - 20, 2011.

We are looking forward to see you in our booth No. 38.

27.02.2011
Association of Czech Testing Institutes (ACTI) foundation
ACTI fundation ratification

ACTI fundation ratification

In Octorber 2010 the Association of Czech Testing Institutes (ACTI) has been founded. The association is a voluntary, nongovernmental, non-profit association of legal entities engaged in testing of heavy current and high voltage apparatus and devices for transmission and distribution of electric energy. …»

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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