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How often is the Level 3 Power Facilities Testing License inspected?

According to IEC and relevant national regulations, transformers in production, semi-finished and finished products, as well as newly installed and overhauled transformers, must undergo transformer ratio testing before being put into operation. The "Regulations for Handover and Preventive Testing of Power Equipment" also require regular transformer ratio testing for operating transformers. Transformer ratio testing can check the condition of transformer windings and tap changers, and determine whether there are defects such as coil short circuits, incorrect connections, or inter-turn short circuits, thereby ensuring the safe use of the equipment.

The transformer ratio and group tester uses a 32-bit ARM core as the processing center to control the entire device. It enables one-time measurement of the ratio for single-phase or three-phase transformers. The instrument's operation is fully displayed in Chinese menus, making it simple and intuitive. The test results are accurate and reliable, and the instrument can store and print test results. It has strong anti-interference capability and can meet the needs of transformer ratio testing for various large, medium, and small transformers.

Features of the transformer ratio and group tester

1. Especially suitable for testing the ratio and phase difference of special transformers

2. Especially suitable for measuring rectifier transformers with phase shifting, clearly displaying the phase shift angle

3. Automatically generates three-phase (120°) or two-phase (90°) power supply with stable amplitude and constant phase

4. Not constrained by the internal wiring of the transformer, directly measures the voltage ratio and phase angle difference between the high and low voltage sides

5. True three-phase simultaneous measurement

6. Test parameters are set at once, and after switching the tap changer, the test is performed directly, automatically determining the tap position and the standard ratio after switching

7. Fast speed, with a test time of 8 seconds for one set of data

8. Test results are not affected by fluctuations in the frequency and amplitude of the power supply

9. Built-in overcurrent protection and protection against reverse connection of high and low voltage

10. The entire test process can be controlled by an upper computer, with data saving and test report printing

11. Test results are automatically saved, with a maximum of 99 saved

12. Built-in user manual for reference at any time

List of equipment for Level 3 power testing qualification: