| Breakdown Voltage |
 |
 |
|
| OELCHECK Test equipment:
|
Testing Instrument DPA 75 for Insulating oil |
| Sample quantity needed: |
400 ml |
| Unit: |
KV |
| Test result: |
Electric strength of insulating oil |
| Operating time: |
About 1 hour |
| Analysis of: |
Transformer-, contactor-, and insulating oils |
| Brief description: |
A test cup is filled with bubble free insulating oil up to its upper edge.
Two spherical pigs out of brass are 40 mm below the liquid surface. The distance between these two electrodes is adjusted to 2.5 mm. The sample is homogenised for 5 minutes in the closed cup. After homogenisation a sinusoidal AC voltage with 2 KV/s is applied to the two electrodes till the first electrical discharge takes place. The achieved voltage is the result of this investigation.
The trial is repeated six times with the same liquid. Between the measurements the test sample is homogenised for 2 minutes. The test result is the arithmetic average of the six measurements
|
| Statement: |
Insulation liquids have to insulate high potential differences They also have to proof insulating material out of fibres or eliminate electric arcs and furthermore transport the heat away. An important test criterion is therefore the electric strength of insulating that means the voltage till which, under defined condition, no spark discharge takes place. |