Product introduction
The Automatic TTR Test Set is a specialized portable electronic instrument designed to measure the voltage ratio (turns ratio) and winding connection vector group of power transformers. It is an indispensable core testing device in the power industry (power plants, substations, utility companies, transformer factories, industrial plants, etc.) for transformer manufacturing, commissioning acceptance, preventive maintenance tests, and fault diagnosis.
Technical Parameters
| Transformation ratio testing range | 0.8～10000 |
| Group testing range | 0～11 |
| Ransformation ratio testing accuracy | class 0.1 (HV:0.8～200) |
| class 0.2 (HV:200～1000) | |
| class 0.5 (HV:1000～10000) | |
| class 0.2 (LV:0.8～100) | |
| Transformation ratio resolution | 0.0001 |
| Power input | 220V±10%, 50HZ±1Hz |
| Service temperature | -20℃~40℃ |
| Relative humidity | ≤85%, no condensation |
| Overall size of host machine | 325mm×280mm×190mm |
| Weight of host machine | 6.9kg |
Product function
1. Verify design parameters: Ensure the actual manufactured turns ratio and vector group of the transformer comply with design drawings and technical specifications.
2. Check tap changers: Verify the turns ratio is correct at each tap position and that tap changer operation is proper with good contact.
3. Detect interturn shorts: Interturn short circuits in windings significantly alter the turns ratio. Precise measurement can reveal such potential faults.
4. Ensure parallel operation: Multiple transformers operating in parallel must have the same turns ratio and identical vector group. Otherwise, large circulating currents can occur, leading to equipment damage. Turns ratio and vector group testing is mandatory before parallel operation.
5. Fault diagnosis & maintenance: Testing turns ratio and vector group is a crucial method for assessing the internal winding condition during abnormal transformer operation or after maintenance.
6. Improve efficiency & accuracy: Compared to traditional methods using multiple precision voltmeters and a variable voltage source (which involve cumbersome manual measurements, calculations, voltage application hazards, and susceptibility to errors), dedicated testers offer high automation, simple operation, safety, speed, and reliable, accurate results.
Summary
The Automatic TTR Test Set is an efficient, precise, and safe tool in modern power testing. It significantly simplifies the traditionally cumbersome and hazardous tasks of measuring turns ratio and vector group, enhancing testing efficiency and result reliability. It provides critical technical support for ensuring transformer quality, safe operation, fault diagnosis, and the stable parallel operation of power grids. Selecting a stable, functionally adequate, and user-friendly TTR & Vector Group Tester is fundamental for power professionals conducting transformer-related tests.
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