Replacing DC withstand test for oil-paper insulated cables



Features: Significant investment in sinusoidal wave technology, low waveform distortion rate, suitable for scientific research institutions or large power plant generator stator testing requiring high precision. Baoding Tianwei/Xinnuo Features: Leveraging the transformer industry cluster, with customization advantages in large-capacity (above 80kV) very low frequency generators. Second tier: International brands (for specific high-end needs) Megger (UK), Doble (USA): Their VLF equipment is renowned for extremely high stability and data analysis software, often used in cross-border projects or situations requiring high legal validity of data, but prices are typically 3-5 times that of domestic brands. 4. Typical application scenarios Cross-linked polyethylene (XLPE): This is the primary application, replacing DC withstand testing. Oil-paper insulated cables: Also applicable, but attention must be paid to the frequency sensitivity of oil-paper insulation. Large generator/motor stator windings: Due to large stator capacitance, power frequency test equipment is extremely bulky, making 0.1Hz VLF the best solution for on-site maintenance. GIS (Gas Insulated Switchgear): Used for on-site withstand testing in some cases, but attention should be paid to the differences in discharge characteristics of SF6 gas at low frequencies. 5. Selection calculation guide (important) Before purchase, the total capacitance of the test object must be calculated to confirm whether the equipment can handle it: