Diagnostics of electro-insulating systems in oil transformers
In this specific field, the company performs diagnostics and assessment of the quality of electro-insulating systems in oil transformers using special methods and procedures. In a very-high-voltage/high-voltage testing laboratory, the company have transformers tested with AC and DC voltage for failures in winding insulations, etc. Analyses of oils and tests of solid insulations are integral parts of the company's activities.
Diagnostics of electro-insulating systems in power transformers
- measurements of insulation resistance, leakage factors and capacities, C2/C50 value
- measurements of winding resistance, voltage ratios
- characteristics assessment of winding connection
- measurements of magnetization current, short-circuit impedance, analyses of polarization spectrum (RVM) and frequency response (FRA)
- dielectric spectroscopy in frequency domain
- measurement of switch time in tapping switches
- operational diagnostics of through insulators
- voltage tests with AC voltage
- thermovision checks and other special tests
Analyses of oils and tests of solid insulation
- measurements of insulation and quality parameters of insulation oils, i.e. tests of breakdown voltage, water content, acid value assessment of oils etc.
- assessment of sludge and corrosive sulphur presence
- tests of thermal-oxidative stability, assessment of amount and size of particles
- content assessment of PCB substances
- inventory of equipment containing PCB substances
- analysis of gases soluble in insulation oil – gas-chromatographic method (DGA)
Services are provided by Division for electrical engineering and Division of electrotechnical laboratories.
