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Insulating Oil Testers

Insulating oil testers are instruments used to assess the condition of insulating oil in transformers, oil-filled (OF) cables and similar equipment, and to detect deterioration and internal abnormalities. Main types include breakdown voltage testers, which apply AC voltage between electrodes and measure the voltage at which the oil breaks down; dissolved gas analyzers, which analyze gases such as hydrogen, methane and acetylene dissolved in the oil to judge precursors of faults such as overheating and discharge; and measurement sets for acid value, an indicator of deterioration. They are used for periodic inspection and acceptance testing at power plants and substations, with portable and compact models for on-site transport and benchtop models equipped with data processing units for laboratories.

How to choose Insulating Oil Testers

  1. 1. Select a test method that suits the purpose

    Breakdown voltage testing evaluates the dielectric performance of the oil itself, dissolved gas analysis detects signs of overheating or discharge inside the equipment, and acid value measurement tracks the progress of deterioration. Required equipment differs depending on what needs to be judged, so confirm the method against the inspection plan.

  2. 2. Check compliant standards and electrode conditions

    Breakdown voltage is specified by standards such as JIS C 2101 and IEC 60156, which define electrode shape, gap and voltage rise rate. Measured values cannot be compared if conditions differ, so confirm that the instrument complies with the standard used in your internal criteria or historical data.

  3. 3. Confirm sufficient maximum test voltage

    With breakdown voltage testers, if the maximum test voltage is lower than the breakdown voltage of the oil being tested, breakdown cannot be induced and no measurement is possible. New or good-quality oils have higher breakdown voltages, so select a model whose maximum voltage exceeds the expected value for the oil.

  4. 4. Check the number of gas types that can be analyzed

    Dissolved gas analysis estimates the type of abnormality from the ratios of gas composition, such as hydrogen, hydrocarbons and carbon monoxide. Some listed products can analyze 11 gas types; confirm that all gases required by the diagnostic method you adopt can be measured.

  5. 5. Measurement range and required oil sample volume

    Confirm that the measurement ranges for gas concentration (ppm) and voltage include the judgment criteria values. Also check the oil sample volume required per measurement and determine whether it matches the amount that can be collected from the equipment and the number of repeat measurements needed.

  6. 6. Prioritize portability for on-site measurement

    For measurements at power plants or substations, confirm that mass, external dimensions, power supply conditions and operating temperature range are workable on site. For laboratories handling many samples, prioritize recording functions such as data processing, printer and USB output.

This guide was written by AI based on the listed products' documents and specification items. Check each manufacturer's documents before adopting.