Go/no-go diagnosis in 60 seconds before re-energising
ADOC-3
Transformer Testing
ADOC-3
Distribution transformer tester
Detecting short-circuits and open circuits in distribution transformers, from 1 kVA to 3 MVA.
Knowing whether it is safe to re-close
The ADOC-3 checks de-energised distribution network transformers, from 1 kVA to 3 MVA and 1000 V to 50 kV. In a single test lasting about 60 seconds, it reveals short-circuits and open circuits in the primary winding as well as short-circuits in the secondary, then classifies the transformer into three states — short-circuit, correct or open — announced by high-brightness LEDs and an audible signal. After a line fault or a storm, the operator knows immediately whether re-energising is safe.
Built for field work
The measurement, in low-voltage AC and DC across three channels, is taken by simple contact on the primary bushings: the secondary cables and loads stay in place. The unit covers single-phase transformers, three-phase banks, Yn and Delta couplings, pole-mounted units, pad-mount transformers and dry-type MV units, and checks the integrity of its own leads before every campaign.
Key strengths
- A single test for every winding.
- Operating temperature from -20°C to +60°C.
- 0.47 kg and 177 × 89 × 45 mm: it fits in one hand.
- IP40 / IK06 enclosure with a rubber protective boot.
- 4 alkaline AA batteries (NiMH-compatible) for 8 hours of measurement.
- Automatic shutdown after 15 minutes and a low-battery indicator.
Kit and accessories
Kit contents
- Compact semi-rigid case with dedicated slots for the accessories.
- Removable, rugged measurement leads with a built-in self-check mode.
- Magnetic strap to secure the unit to the tank, keeping both hands free.
- Rubber boot against drops and liquid splashes.
- Standard AA batteries, replaceable in a few seconds.
Optional accessories
- Spare 1.5 m measurement lead.
- Rigid transport case, 11 × 21 × 30 cm.
- Set of adapter pins for transformer elbows.
Applications
- Checking transformers after a storm or line fault, before re-closing.
- Inspection campaigns on overhead networks and distribution substations.
- Testing de-energised three-phase banks, pad-mount transformers and dry-type MV units.
- Workshop receiving inspection before commissioning.
| ADOC-3 — MEASUREMENT DATA | |
|---|---|
| Detection | Short-circuit, correct, open circuit |
| Result indication | Audible and visual (high-brightness LED) |
| Primary configurations | Single-phase, Delta, Yn |
| Rated transformer voltage | 1000 V to 50 kV |
| Transformer power | 1 kVA to 3 MVA |
| Measurement channels | 3 |
| Measurement type | Low voltage, AC and DC, by contact on the primary bushings |
| Secondary loads | Remain connected during the test |
| Verification | Self-check of the measurement leads' integrity |
| Test duration | About 60 seconds; a single test for all windings |
Go/no-go type test: the unit does not provide numerical values to interpret.
ADOC-3 — TECHNICAL SPECIFICATIONS
| Operating temperature | -20 to +60°C |
|---|---|
| Dimensions | 177 × 89 × 45 mm |
| Weight | 0.47 kg |
| Protection ratings | IP40; IK06 |
| Power supply | 4 alkaline AA batteries, 1.5 V; compatible with rechargeable NiMH batteries |
| Autonomy | 8 hours of measurement |
| Power management | Automatic shutdown after 15 minutes of inactivity; low-battery indicator |
| Self-test | Automatic at power-on; self-check of the leads |
| Protection | Rubber boot; magnetic mounting strap |
| Case | Semi-rigid, compact, with accessory storage |
| Optional accessories | Spare 1.5 m lead; rigid case 11 × 21 × 30 cm; elbow adapter pins |