Oil dielectric breakdown tester

Data records

• The aging of the insulating oil, which oxidation, thermal stress and contact with other materials drive, largely determines the service life of a transformer, and breakdown voltage testing is one of the tests by which the liquid is checked before the transformer fails. Source: BAUR product overview page, web page edition. Verified 2026-10-27. Record instr.oil-dielectric-breakdown-tester.applications
• A laboratory set runs the measurement sequence of the test method fully automatically, is built for continuous daily operation in a laboratory, and is suitable for mineral oils, silicone oils and ester liquids. Source: BAUR product page, web page edition. Verified 2026-10-27. Record instr.oil-dielectric-breakdown-tester.automatic-sequence
• The maker of a laboratory breakdown tester offers calibration of the instrument under a laboratory accreditation to ISO/IEC 17025:2017. Source: BAUR product page, web page edition. Verified 2026-10-27. Record instr.oil-dielectric-breakdown-tester.calibration
• An oil dielectric breakdown tester applies a rising alternating voltage across a gap between two electrodes immersed in a sample of insulating liquid and records the voltage at which the liquid breaks down. Source: Megger product page, web page edition. Verified 2026-10-27. Record instr.oil-dielectric-breakdown-tester.definition
• The electrode sets are named by the test method they serve: spherical electrodes for the IEC method, mushroom-shaped electrodes for the VDE method and ASTM D1816-12(2019), and cylindrical disk electrodes for the ASTM disk-electrode method; the set is supplied with a selection of test vessels matched to the national specifications. Source: Megger product page, web page edition. Verified 2026-10-27. Record instr.oil-dielectric-breakdown-tester.electrode-shapes
• Portable sets are lightweight units for field use that run from a mains supply and are operated semi-automatically, while laboratory sets are designed for continuous operation and reproducible results across many measurement sequences. Source: Megger product page, web page edition. Verified 2026-10-27. Record instr.oil-dielectric-breakdown-tester.portable-vs-laboratory
• The test voltage rises at a rate chosen from those the national test methods specify; at breakdown the set switches the high voltage off and shows the voltage that was reached. Source: Megger product page, web page edition. Verified 2026-10-27. Record instr.oil-dielectric-breakdown-tester.rising-voltage
• The high-voltage chamber is covered by a transparent polycarbonate window and a mesh screen that lets the breakdown be watched while reducing electromagnetic emission, and the chamber door carries a safety interlock. Source: Megger product page, web page edition. Verified 2026-10-27. Record instr.oil-dielectric-breakdown-tester.safety-chamber
• Some test vessels carry a motor-driven propeller that stirs the sample, so that the products of one breakdown are dispersed before the next breakdown in the sequence. Source: Megger product page, web page edition. Verified 2026-10-27. Record instr.oil-dielectric-breakdown-tester.stirring
• The rise can be paused at a chosen voltage to run a withstand test, in which the voltage is held for a timed period or until breakdown, after which the rise resumes to breakdown or to the full output of the set. Source: Megger product page, web page edition. Verified 2026-10-27. Record instr.oil-dielectric-breakdown-tester.withstand-mode