Just for fun

CIE/7000 oil BDV tester, in your browser Beta

Pour an oil sample, let the bubbles settle, close the door and raise the voltage until the oil breaks down. Do six tests, read the mean, and see why wet and dirty oil fails early.

CIE/7000 Series product page All oil test sets Back to the playground
Beta, just for fun. This is a playful beta, for illustration only. It is not a training tool and not a substitute for the real instrument. The actual CIE/7000 Series can differ in appearance, display, button behaviour, ranges, timings and readings. Everything here is simulated, so do not use it to judge a real measurement. Always follow the instruction manual and your site safety procedure.
kV CIE · OIL TEST SET MAINS ON ZERO START DOOR CLOSED H.T. ON TRIPPED MEMORY MAINS H.T. ON H.T. OFF Mains onZero start onlyTrips output 0.0 kV 0.0 kV/s REGULATOR ▲ RAISE ▼ LOWER OIL TEST CELL · gap 2.5 mm (not to scale) DOOR: CLOSED Beta · just for fun

Click the door to open and close it. Motorised: hold ↑ to raise, ↓ to lower. H = H.T. ON, X = H.T. OFF.

Try a scenario

1Pick the oil and the set

2Run the test

    Stir the oil gently
    Skip the waiting
    Pour a fresh sample

    3Results

    TestBreakdown

    4Simulator settings

    Sound
    Reset everything

    How a transformer oil BDV test works

    • What BDV means: breakdown voltage is the voltage at which the oil between two electrodes stops insulating and a spark jumps across. Clean, dry oil holds a high voltage. Water, dust, fibres and sludge make it fail at a much lower voltage. It is one of the quickest checks on the health of the oil in a transformer or circuit breaker.
    • The procedure (IS 6792 style): fill the cell, let it stand for a few minutes so air bubbles rise out, close the door, and raise the voltage steadily at about 2 kV per second until breakdown. The set trips and remembers the reading. Stir gently, wait, and repeat. Six breakdowns give a mean value.
    • Interlocks: the set cannot be energised with the test chamber door open, and the H.T. only starts if the regulator is at zero, so you cannot switch onto a high voltage by accident. Opening the door during a test trips the set.
    • Why wait: tiny air bubbles lower the breakdown voltage. Test too soon after filling, or straight after a spark, and the result reads low.
    • Why six tests: breakdown is a random event. Even good oil scatters from one test to the next, so a single reading proves little. The mean of several is much more reliable.
    • Range: the CIE/7000 series covers 50, 60, 70, 75, 80, 90, 100 and 120 kV, each in manual and motorised versions. If the oil is stronger than the range of your set, it will not break down at full scale.

    This is a playful beta simulation. Breakdown values for each oil type are made up for illustration, and the lamps, button behaviour, lowering speed and tripping of the real set are approximated. Real oil testing involves lethal high voltage and must follow the standard, the instruction manual and your site safety procedures. Never operate a real set with the interlocks bypassed.

    Want the real thing on your bench?

    The CIE/7000 series is made and supplied by CIE in Howrah, with test certificate available on request.

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