Chemical- physical analyses
Insulating media
Insulating media
The service portfolio includes the monitoring of transformers, e-coils and instrument transformers with the help of chemical-physical analysis of the insulating oils. The assessment is based on the recognized standards EN 60422, EN 60296 and EN 60599.
The examination parameters and the examination intervals depend on various factors such as device status, voltage level and system relevance. Hence, our services also include individual counseling regarding the optimal examination program.
Our services
| Gas-in-oil analysis DGA (Töpler pump/GC) | EN 60567 |
| Gas-in-oil analysis DGA (Headspace/GC) | -- |
| Polychlorinated biphenyls (PCB) | EN 12766 / Verf. B |
| Furfural and related compounds (furans) | EN 61198 |
| Degree of polymerization of paper | IEC 60450 |
| Appearance / purity | ISO 2049 |
| Color number | ISO 2049 |
| Refractive index at 20°C | DIN 51423-2 |
| Density (flexural bar method) | DIN EN ISO 12185 |
| Kinematic viscosity (per temperature point) | ISO 3104 |
| Water determination (coulometric) | IEC 60814 |
| Total pollution (GV) | IEC 60422 / Annex C |
| Neutralization number (NA) | EN 62021 |
| Saponification number (VZ) | DIN 51559 |
| Interfacial tension vs. water (incl. density) | ASTM D971-99a |
| Flash point (Pensky-Martens) | ISO 2719 |
| Breakdown voltage | IEC 60156 |
| Dissipation factor (90°C) | IEC 60247 |
| Inhibitor content (FTIR spectroscopy) | IEC 60666 |
| Aromatic content (FTIR spectroscopy) | IEC 590 |
| Particle content (cleanliness class) | EN 60970 |
| Potentially corrosive sulfur (qualitative test) | ÖNORM EN 62535 |
| DBDS (Corrosive sulfur conductor) | IEC 62697-1 |
| Passivator content (HPLC) | DIN IEC 60666 |
| GC-MS screening (to determine the type of oil) | -- |
| Method for stray gassing under thermo-oxidative stress | IEC 60296 Annex A (2020) |
| Gassing Characteristics of Insulating Liquids under Thermal Stress at Low Temperature (Stray Gassing) | ASTM D 7150 Method A |
In addition to the standard analysis of insulating oils, special questions can be dealt with by VUM:
- Post-mortem examinations (Dp-value distributions, furans in the paper including sampling)
- Determination of hydroperoxides (beginning of oil aging) in insulating oils
- Research and processing of specific questions on insulating oil analysis and materials in high-voltage technology
Databased condition assessment of equipment filled with insulating media
Due to the large amount of data in the field of insulating oil analysis with more than 700,000 analysis results for around 20,000 devices, VUM has a valuable database that is unique in the field of converter diagnostics.
Data evaluations together with additional external variables such as weather data, strains or the history of the equipment allow a profound understanding of the aging behavior of oil-filled equipment. Characteristics of individual manufacturers, types, years of construction or similar can also be analyzed in this way. For a more accurate assessment of the condition of the device, the comparison of individual conspicuous pieces of equipment with similar devices of the same type and age is of particular value.
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