The base model, MTO300, is designed to be remote controlled via PowerDB software on an external PC or a Megger transformer test product with on-board computer.
The MTO330 offers the same functionality as the MTO300. However, it is equipped with an onboard computer featuring full QWERTY keyboard and navigational push-buttons as displayed on an 8.4 inch full-color VGA transflective screen viewable in bright sunlight.
It has an internal computer and can be used to control other Megger products such as the TTR300, TTR310, FRAX99, FRAX101, DELTA2000, DELTA4110, and MLR10.
Features
- One-time connection enables 4x faster setup and reduces safety risks by over 70%.
- Automated eight-terminal/six-winding measurement capability for efficiency.
- Compatible with Megger's three-phase TTR series using interchangeable leads.
- Simultaneous winding magnetization delivers quick and precise resistance measurements for high inductive loads.
- Built-in auto-demagnetization feature for safety.
- Includes on-load tap changer operation testing.
- Streamlined testing without needing to disconnect or reconnect leads.
- "One clamp per bushing" reduces setup errors.
- Saves time by eliminating external jumper cables with its measurement capability.
- Interchangeable leads with the Megger TTR300 series offer cost savings.
- Supports DC test current up to 10 A.
- Built-in discharge circuit for safety post-testing.
- Demagnetization circuitry helps prepare transformers for further testing or re-service.
- Custom PowerDB form supports interval testing.
- PowerDB software facilitates on-site data analysis and trend monitoring.
- Easy recall of transformer setups via PowerDB's custom settings.
- USB interface for remote control and data management.
- Features an onboard 8.4-inch VGA screen, legible in sunlight, with data storage and download capabilities.
Specifications
| Input Power |
120/240 V, 50/60 Hz, 720 VA |
| Output |
User Selectable Current Ranges:
up to 10 mA
up to 100 mA
up to 1 A
up to 10 A
Open Circuit Test Voltage: up to 40 V dc
Measurement Voltage: up to 20 V dc
Max Power: 200 VA continuous |
| Resistance ranges |
1 µΩ to 2 Ω @ 10 A
10 µΩ to 20 Ω @ 1 A
100 µΩ to 200 Ω @ 100 mA
1 mΩ to 2000 Ω @ 10 mA |
| Accuracy |
±0.25% reading, ±0.25% full scale (when current has stabilized) |
| Operating environment |
14° F to 122° F (-10° C to 50° C) |
| Relative Humidity |
0-90% non-condensing |
Applications
- Verify factory test readings
- Help locate the presence of defects in transformers such as increased contact resistance in terminal connections and tap-changers
- Check the operation of on-load tap changers.