Dual Canopy Mechanic Electrical Engineering Co., Ltd. is one of the leading manufacturers and suppliers of oil breakdown testers in China. Please feel free to wholesale discount products for sale here and get quotation from our factory. Customized orders are welcome.
What is Oil Breakdown Testers?
An oil breakdown tester is built to measure the breakdown voltage (BDV) of insulating oil under defined test conditions. It works by applying a steadily increasing AC voltage across standard electrodes submerged in the oil sample, then recording the exact voltage at which the oil fails electrically. This figure tells you how much electrical stress the oil can handle and how clean it is.
BDV sits at the center of insulating oil quality control and condition monitoring. It tracks directly with contamination levels-moisture, trapped air, fibrous particles, and conductive debris all weaken the oil's insulating ability and pull the BDV down. When the reading drops below acceptable limits, it is a clear sign the oil needs treatment through filtration, dehydration, purification, or replacement altogether.
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What standards does the equipment follow?
Standard/Electrode Type/Electrode Spacing/Voltage Boost Rate/Main Features
IEC 60156/Sphere-to-Sphere (2.5mm/2kV/s/Internationally Used, Widely Covered)
ASTM D1816/Mushroom Shape (VDE)/1mm/2mm/0.5kV/s/More Sensitive to Trace Moisture
ASTM D877/Disc Shape/2.54mm/3kV/s/Traditional North American Standard
GB/T 507/Sphere-to-Sphere/2.5mm/Refers to IEC/Chinese National Standard
What are some common reasons for low BDV?
Causes/Characteristics/Recommendations
High moisture content/BDV varies greatly with temperature/Vacuum dehydration treatment
High bubble content/Poor test repeatability/Settling/Degassing treatment
Fiber contamination/Low but stable BDV/Filtration treatment
Conductive particles/Extremely low BDV/Filtration, identify source
Overall deterioration/Multiple abnormal indicators/Comprehensive treatment or oil change
Standard Matching Selection: Model recommendations tailored to your required test standards (IEC, ASTM, or GB), maximum test voltage, and whether you need interchangeable standard electrode configurations.
Laboratory/Field Configuration Recommendations: Guidance on equipping your setup with standard oil cup sets, spare electrodes, spacing gauges, dedicated sampling bottles, and oil sample handling tools for consistent, repeatable testing.
Oil Quality Management Solution: Sampling protocols, recommended testing intervals, and record templates to help you build a structured, standardized oil quality management program.
Document Support: Product specification sheets, full configuration lists, sample test reports, and tender documentation (where available)
FAQ
Q1: What is the difference between an Oil Breakdown Tester and an Insulation Oil Dielectric Strength Tester?
A: They are essentially the same, both measuring the breakdown voltage (BDV) of insulating oil. The different terminology stems from different regional conventions. The key difference lies in the supported standards, electrode types, and level of automation.
Q2: Can the test results of IEC 60156 and ASTM D1816 be directly compared?
A: Direct comparison is not recommended. The electrode shapes, spacing, and voltage ramp rates differ, and the test conditions vary, leading to results that cannot be directly converted. Comparison should be made under the same standard.
Q3: Why is it necessary to perform 6 tests and average the BDV result?
A: A single breakdown result is affected by randomly distributed impurities and bubbles in the oil sample, resulting in poor repeatability. Averaging multiple tests reduces random errors and improves the representativeness of the results.
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