OBV-80B
OBV-80B Automatic Oil Dielectric Tester
Set the method, close the lid and press Start. The OBV-80B settles the sample, raises the voltage at your chosen rate, records every breakdown, stirs between them and prints the average.
0 to 80 kV
From a 1.5 kVA step-up transformer, ±(3% of reading + 2 digits).
Three standards built in
IEC 156, ASTM D877 and ASTM D1816, plus your own method.
Up to six breakdowns
Stirred between each, averaged automatically.
Printed on the spot
Results and averages straight from the built-in printer.
Where it’s used
The breakdown voltage of insulating oil is a quick check of its condition, and shows when the oil needs treatment or replacing.
Transformer test stations
Routine acceptance and periodic checks on transformer oil before and after filling.
Power distribution and transmission
Regular oil checks on transformers across the network, in the lab or on site.
Railway systems
Traction and substation transformer oil, tested on site or in the depot.
Power plant maintenance
Oil checks on generator transformers and auxiliaries during planned outages.
One test, start to finish
Once you press Start, the whole sequence runs by itself.
Settle
The sample stands for the set wait time before the first rise.
Rise
The voltage climbs at the rate set on the selector.
Breakdown
The breakdown voltage is recorded and the voltage removed at once.
Stir and pause
The oil is stirred and rested before the next rise.
Average
After up to six breakdowns the average is shown, stored and ready to print.
Three standard methods, ready to run
Choose IEC 156, ASTM D877 or ASTM D1816 from the setup menu and set the maximum test voltage, from 10 to 80 kV in 10 kV steps. Then set the rate of rise the method calls for:
The electrodes sit in a glass test cell cast in one piece, at the standard 2.5 mm gap, set with the master gauge supplied.
Your own method, or full control
For in-house procedures, the user method sets every stage of the cycle. Manual mode puts the rise in the operator’s hands.
| Setting | Range | Step | Default |
|---|---|---|---|
| Wait | 1 to 15 min | 1 min | 15 min |
| Pause | 1 to 10 min | 1 min | 5 min |
| Stir | 5 to 90 s | 5 s | 10 s |
| Maximum test voltage | 10 to 80 kV | 10 kV | 60 kV |
| Breakdowns | 1 to 6 | 1 | 6 |
Manual mode
Raise, lower and stop the voltage from the keys. After each breakdown the voltage is removed and the oil stirred automatically, then you start the next when ready. Up to six breakdowns, averaged and stored.
Built for the job
One-piece glass test cell
Cast in one piece from special glass, so there are no joints to leak oil or pick up interference.
High-voltage end sampling
The test value is sampled at the high-voltage end and passed straight to the analogue-to-digital converter, avoiding errors in the analogue circuit.
Temperature and humidity on screen
A built-in sensor shows the ambient temperature and relative humidity beside the date and time, ready to note with the result.
Printer and stored results
Print each result and average on the spot. Recent tests are stored with their date and time, to review or print again later.
Technical specifications
| Output voltage | 0 to 80 kV |
| Step-up transformer | 1.5 kVA |
| Rate of voltage rise | 0.5, 1, 2, 3 and 5 kV/s, selected by switch |
| Voltage accuracy | ±(3% of reading + 2 digits) |
| Supply distortion | <1% |
| Test methods | IEC 156 · ASTM D877 · ASTM D1816 · user method · manual |
| User method | Wait 1 to 15 min · pause 1 to 10 min · stir 5 to 90 s · maximum test voltage 10 to 80 kV · 1 to 6 breakdowns |
| Maximum test voltage | If no breakdown occurs at the set maximum, the voltage is held for 50 s |
| Results | Each breakdown voltage and the average, calculated automatically |
| Electrode gap | 2.5 mm standard, set with the master gauge supplied |
| Test cell | Special glass, cast in one piece |
| Display | Large LCD · date, time, operating parameters, results and menus |
| Environment sensing | Temperature (°C) and relative humidity shown on the display |
| Printer | Built in · prints single results and averages |
| Protection | Over-current, over-voltage and short-circuit · alarm if the earth is not connected |
| Power supply | 220 V AC ±10% · 50/60 Hz ±5 Hz · <200 W |
| Operating conditions | 0°C to 40°C · relative humidity ≤85% |
| Dimensions / mass | 409 × 393 × 388 mm · 29 kg |
What’s in the box
- OBV-80B main unitWith built-in printer
- Test cellGlass, with electrodes
- Master gaugeFor the 2.5 mm electrode gap
- Stirring paddles (2) and tweezersFor handling the paddles
- Power lead and spare fusesTwo 3 A fuses
- Roll of printer paperWith operating manual, warranty card and certificate
Need pricing or a spec check?
Tell us the standard you test to and we’ll come back with pricing, lead time and options.
Worth checking first
- Supply. The OBV-80B runs on 220 V AC ±10%, 50/60 Hz. Talk to us if your site supply is different.
- Electrode gap. The test cell is set to the standard 2.5 mm gap with the master gauge supplied.
- ASTM D1816 and D877. If you test to either, ask us which electrode set is supplied for your method.