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Siviko
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  3. Siviko
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  5. High Voltage Laboratory Services

High Voltage Laboratory Services

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Electrical energy has long been at our core, dating back to the earliest days of our history as a company, and it continues to be vibrant and central to our work. Cornerstone in our history was 2004 when we restored together with Technical University of Sofia the High-voltage Laboratory that was first established in the 50’s.
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We work jointly with High-voltage Laboratory of Technical University of Sofia. The laboratory is convenient place for design solution delivery, as well as real world testing of completed products in the field of electrical power distribution. The laboratory gear includes an auto-transformer 40kVA, an AC testing transformer 700kV / 0,5A, light impulse voltage generator 750kV and measuring equipment up to 750 kilovolts.

High Voltage Lab Testing Services

  • Maximum impulse voltage: 750 kV
  • Maximum 50 Hz voltage: 700 kV

Test Facilities

  • Indoor HV lab dimensions: 17 m (l) x 10 m (w) x 11m (h)

AC Test Equipment

  • Test transformer: 50Hz, 700 kV, 0.5 A Cont.
  • Capacitive voltage divider: 700 kV
  • Resistive voltage divider: 750 kV
  • Digital oscilloscope
  • Radio interference voltage (RIV) meter

Impulse Voltage Test Equipment

  • Impulse generator: 750 kV, 1,2 kJ
  • Capacitive voltage divider: 750 kV
  • Resistive voltage divider: 750 kV
  • High-resolution digital recording system
  • Digital oscilloscope
  • Storage analogue oscilloscope

DC Voltage Test Equipment

  • DC generator: 125 kV, 100 mA
  • Resistive voltage divider: 750 kV

We have experience in performing tests of the electrical insulations, electromagnetic compatibility, electric safety, electro-technical materials and high-voltage installations. Furthermore, we have developed an intelligent and innovative diagnostic methodology for condition assessment of power transformers, generators and MV and HV cables. We are able to point out the reasons for eventual problems in the electrical insulation as well as to establish the quantitative and qualitative aging indicators.

  • Standard high voltage testing
  • Testing and evaluation of porcelain, glass and composite insulators (dry and wet, withstand and flashover)
  • Testing of bushings
  • Testing of switchgear, disconnecting switches and circuit breakers
  • Testing and commissioning of power cables and accessories
  • Testing of power transformers (partial discharge and impulse tests)
  • 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
  • EMF calculation, analysis and consultation
  • EMF measurement
  • Field testing: substation equipment
  • Transient measurement for transmission and distribution system
  • Correspondence to standards
  • 50 Hz dry & wet voltage flashover test
  • Lightning impulse voltage withstand and flashover test
  • Corona test (electrical and visible image detection)
  • Tan delta measurement (24kV; 0,1Hz)
  • Insulation watts loss test