Fully automatic measurement of the breakdown voltage of insulating oils, with test voltages up to 100 kV
The Dielectrotest determines the dielectric strength of insulating liquids in the laboratory and in the field: the standard is chosen from the menu, the lid is closed and the set runs the whole sequence by itself, prints the report and calculates the statistics.
Advantages
The standardised test, with a couple of keys
The sequences of the most common national and international standards come pre-programmed, and the user can freely define and store up to 10 sequences of his own.
Switch-off in less than 1 millisecond
The high voltage is disconnected in less than 1 ms after breakdown, which avoids carbonisation of the sample and allows reliable consecutive measurements.
Statistics computed on the spot
The set displays the individual breakdown values, the average value and the standard deviation, the figures with which the standards characterise the sample.
Printed report and PC archive
The built-in thermal printer issues the report with date, time, temperature and sample number; the last 20 tests remain in memory and are downloaded to the computer via Bluetooth or RS-232.
Designed for safe operation
An interlock cuts the high voltage if the lid is opened during the test, and the test chamber is electromagnetically shielded within a rugged housing.
Applications
- Periodic control of the oil of power and distribution transformers.
- Commissioning and field maintenance of oil-insulated switchgear.
- Laboratories analysing mineral oils and insulating liquids.
- Verification of the oil after filtering, drying or regeneration processes.
About the product
The sample is tested in a 400 ml glass vessel with lid and magnetic stirrer, using mushroom, sphere or disc electrodes with adjustable spacing checked with the 2 and 2.5 mm gap gauges. Before starting, the set displays the electrode type and spacing required by the selected standard, and accepts the sample temperature and number for the report.
The backlit graphic display and the four keys F1 to F4 guide the operation in several languages. Available accessories: pairs of mushroom, sphere or disc electrodes to ASTM D877, thermal paper and PC software for storing and printing the results.
Technical specifications
| Test voltage | Up to 100 kV |
| Switch-off at breakdown | Less than 1 ms |
| Standards | Pre-programmed IEC and ASTM sequences (IEC 60156, ASTM D877) |
| User sequences | Up to 10, configurable |
| Results | Individual values, average and standard deviation |
| Recording | Built-in printer; 20-test memory; PC via Bluetooth or RS-232 |
| Test vessel | Glass, 400 ml, with lid and magnetic stirrer |
| Electrodes | Mushroom, sphere or disc; adjustable spacing (2 and 2.5 mm gauges) |
Frequently asked questions
Why is the oil breakdown voltage tested?
Because moisture and particles reduce the dielectric strength; measuring it at regular intervals detects the degradation of the liquid insulation in time.
Which standards can it apply?
The most common sequences of the international standards, such as IEC 60156, come pre-programmed, with mushroom, sphere or disc electrodes to ASTM D877.
How are the results documented?
The thermal printer issues the full report at the end; the last 20 tests are stored in memory and can be reprinted or downloaded to a PC.
Is it safe for the operator?
Yes. The lid interlock disconnects the high voltage when opened, and the test chamber is shielded inside a rugged housing.
Is it suitable for field work?
Yes. It is a portable set conceived for commissioning and maintenance on site, as well as for the laboratory.
