Your Professional Transformer Oil BDV Tester Supplier
Founded in 1992 and formally incorporated as Wuhan Moen Intelligent Electrical Co., Ltd. on November 12, 2012, with a registered capital of RMB 36 million, we are a professional technology company specializing in the research, development, and production of high-voltage test equipment. Our 8,000 m² facility in Wuhan East Lake High-Tech Development Zone houses dedicated production lines, R&D centers, and administrative facilities. With an experienced technical and production team, Moen focuses on core products including test transformers, series resonance systems, and other high-voltage testing equipment. Backed by years of industry experience, the company is committed to reliable manufacturing, continuous technical improvement, and providing practical solutions for global power utility and industrial customers.
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Why choose us
Our Certificate
We are certified in ISO 9001 (Quality), ISO 45001 (Health & Safety), and ISO 14001 (Environment), ensuring high standards in all aspects of our operations.
Strong R&D Capability
Committed to technological breakthroughs, including investments to develop 750kV reactor solutions.
Experienced Technical Team
A growing team of 61 employees supporting product development, production, and customer service.
Complete Pre & After-Sales Service
From solution design and technical support to installation, maintenance, and fast response service.
An insulation oil breakdown voltage tester, also known as a dielectric strength tester, is a critical instrument used to assess the quality and performance of insulating oils in transformers, circuit breakers, and other high-voltage equipment. These testers determine the voltage at which the oil fails to insulate, providing vital data for maintenance and safety.
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Output voltage |
0kV～80kV |
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Boost converter capacity |
1.5kVA |
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Voltage boost rate |
0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0 kV/s (optional) |
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Voltage measurement error |
±3% |
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Power |
200W |
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Total voltage distortion |
<3% |
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Dimensions & Weight |
Dimensions: 470mm × 425mm × 385mm (L×W×H) Weight: 40kg |
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Power supply voltage |
AC 220V±22V |
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Power supply frequency |
50Hz±2.5Hz |
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Ambient temperature |
0℃～+40℃ |
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Relative humidity |
<80% |
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Features of Insulation Oil Breakdown Voltage (BDV) Tester
The primary function of an insulation oil tester is to determine the voltage at which the oil fails electrically—Known as the breakdown voltage (BDV). This value indicates the oil' s ability to withstand electrical stress without arcing.
Testing speed varies significantly based on automation level, directly impacting maintenance workflow and operational downtime.
Advanced testers use controlled voltage ramping to gradually increase electrical stress until breakdown occurs, ensuring consistent and accurate measurements.
Modern insulation oil testers feature digital interfaces with real-time monitoring and data logging capabilities.
Types of Insulation Oil Breakdown Voltage (BDV) Tester
Manual Testers
Require full user involvement in test execution, including voltage adjustment and result recording.
Semi-Automatic Testers
Combine manual setup with automated voltage ramping and basic result processing.
Fully Automatic Testers
Offer complete automation from sample loading to result analysis and reporting.
Portable vs. Benchtop Models
Available in both portable and stationary configurations to suit field and lab use.
Applications of Insulation Oil Breakdown Voltage (BDV) Tester
Electrical Power Generation and Distribution
Power plants, transmission substations, and distribution networks rely heavily on high-voltage transformers filled with insulating oil. The integrity of this oil is vital for preventing short circuits, flashovers, and equipment damage.
Manufacturing Sector
Manufacturers of high-voltage equipment—Such as generators, motors, switchgear, and HVAC systems—Integrate insulation oil testing into their quality assurance processes. Before equipment leaves the production line, the insulating oil must meet strict dielectric performance standards.
Oil and Gas Industry
Offshore platforms, drilling rigs, refineries, and petrochemical facilities operate in harsh environments characterized by high humidity, temperature fluctuations, vibration, and exposure to corrosive elements—all of which can degrade insulating oil over time.
Chemical Processing and Refining
Chemical plants and refineries utilize large-scale electrical infrastructure to power reactors, distillation columns, and process control systems. These environments often expose electrical equipment to chemical vapors, moisture, and extreme temperatures.
Instructions for Use of Insulation Oil Breakdown Voltage (BDV) Tester
Preparation: When preparing the tester, one must ensure that the electrode assemblies and containers are clean and dry. Any contamination or moisture left on the electrodes or oil will influence the results of the test. If using a manual tester, set the voltage limit to a safe lower level before starting.
Oil Sample Collection: Using a clean and dry vessel such as a glass or plastic container, collect the transformer oil sample and let it settle for a few moments to allow any bubbles or impurities present to rise to the surface. Then, pour the oil sample into the test container carefully, ensuring the test container has sufficient oil, approximately 2-3 inches deep for electrode submersion.
Testing: After the oil sample is placed into the container, close the lid carefully to prevent any type of contamination or spill from happening. If using a manual tester, also set the voltage increment to be gradual.
Applying Voltage: Gradually increase the voltage by turning the knob (for manual testers) or observing (digital testers) as the voltage is applied to the oil. Watch the oil closely for any change, such as a spark, noise, or sudden light flicker. This point is called breakdown voltage.
Recording Results: In Breakdown, take seamless care of voltage readings and anything that happens during the breakdown process. At breakdown, high oil creates a situation between electrodes that causes arcing or dielectric rupture. Record this voltage level; this is the breakdown voltage of the oil sample.
Follow Standardized Procedures
Conduct tests according to recognized standards such as IEC 60156 or ASTM D877 to ensure consistency and accuracy across measurements.
Use Clean Sampling Techniques
Contaminated samples can lead to false low readings. Always use dry, sealed containers and avoid introducing moisture or particles during collection.
Calibrate Equipment Regularly
Ensure the tester is calibrated annually or per manufacturer guidelines to maintain measurement precision.
Perform Multiple Tests
Take an average of six breakdown measurements per sample to account for variability and improve result reliability.
Integrate with Oil Reconditioning
Combine testing with filtration or dehydration systems to restore oil quality and reduce replacement costs.
Maintenance and repair
Regular Calibration
One important thing in the process is to ensure that the tester gives the right results while performing the test. By regularly calibrating the instrument, higher or lower voltage readings are avoided when performing the oil breakdown test compared to the actual conditions. Calibration is performed according to the manufacturer's instructions. Calibration can be conducted internally or externally based on the tester's user.
Cleaning
The tester's electrodes must be cleaned after each breakdown voltage test. This is due to the formation of oil residue, carbon deposits, arcing, etc. These deposits cause one to get wrong results in subsequent tests. Use lint-free cloth, brush, or specific solvent according to the manufacturer's recommendations to clean the electrodes thoroughly.
Container Inspection
Ensure that the test container is not cracked, damaged, or contaminated in any way. A damaged container might have a high accident risk or significantly impact the ability to contain oil during testing. Inspect the container before each use, focusing on its integrity. Replace any damaged containers.
Seal and Insulation Check
Check the tester for any kind of defect in the seals or insulator, which may lead to the entry of moisture or destruction of electrical space. This will cause insulation failure and result in dangerous readings. Regularly check seals, gaskets, and insulating materials, and change them when worn out. Ensure there is no degradation of voltage or oil exposure.
Software Updates
Update the software regularly if the tester is based on a software environment to provide optimum performance and address tests.
Certificates
FAQ
As one of the most professional transformer oil bdv tester manufacturers in China, we're featured by quality products and good price. Please rest assured to buy high quality transformer oil bdv tester in stock here and get quotation from our factory. Customized orders are welcome.
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