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The Megger MWA30A 3-Phase Ratio and Winding Resistance Analyzer is a portable transformer test device essential for testing power transformers, distribution transformers, CTs and VTz (PTs) and motors / generators. All ratio and winding resistance tests are performed in one instrument, with only one 3-phase lead-set connection. The MWA330A system is equipped to conduct a diverse array of tests, including 3-phase turns ratio, 3-phase winding resistance and a 3-phase core demagnetization testing. Resistance is provided on all six windings--once connected, the MWA330A performs DC resistance measurements on all high-and-low-side windings without reconnection. Test procedure is simple and efficient. Technicians save time by testing all six windings without the need for inter-connect boxes and without having to disconnect and reconnect leads. The MWA330A can be controlled via an external customer PC or its built-in industrial PC, the latter featuring a 12 in. bright-color touch-screen display resistant to direct sunlight and harsh environments. IT intervention is un-necessary as the MWA330A safely stores results and reports.
Features
- Combines TTR and resistance testing in one box - faster, more efficient testing
- 55% smaller, 40% lighter than individual instruments
- Only one set of leads required - lighter, smaller and less expensive
- Built-in demagnetization
- No switchbox required, ensuring easier and safer operation
- Unique Kelvin clamps with patented adjustable jaws each open to 100 mm (4-in.) as well as banana plug input for connection to terminal blocks
- Checks the contact and timing health of LTC (OLTC) tap changers
- Single-person testing of LTCs is provided standard for use with optional remote tap controller (RTC-1)
- PC interface via USB for remote control operation and downloading of test results for ease of use
Specifications
| Current Range (A) | Resistance Range (W) | Resolution (W) |
| 10 A | 10 mW to 0.2 W | 0.000001 |
| 10 A | 0.2 W to 2 W | 0.0001 |
| 1 A | 100 mW to 2 W | 0.00001 |
| 1 A | 2W to 20 W | 0.001 |
| 100mA | 1 mW to 20 W | 0.0001 |
| 100mA | 20 W to 200 W | 0.01 |
| 10 mA | 10 mW to 200 W | 0.001 |
| 10 mA | 200 W to 2000 W | 0.1 |
| AC Range and Turns Ratio Accuracy |
| 8 V AC: | ±0.1% (0.8 to 2000) ±0.25% (2001 to 4000) ±0.35% (4001 to 8000) |
| 40 V AC: | ±0.1% (0.8 to 2000) ±0.15% (2001 to 4000) ±0.3% (4001 to 10,000) ±0.35% (10,001 to 25,000) |
| 80 V AC: | ±0.1% (0.8 to 2000) ±0.15% (2001 to 4000) ±0.25% (4001 to 10,000) ±0.30% (10,001 to 45,000) |
Standards
- EC60076-2-1993
- C57.12.90 2013
- ANSI C57.12.70-1978