According to the relevant standards of IEC and the national regulations, the transformer ratio test is a mandatory item during the production, user handover, and maintenance testing processes of power transformers. This effectively monitors the quality of transformer products from the factory to their usage, preventing issues such as inter-turn short circuits, open circuits, connection errors, internal faults, or contact faults in the voltage regulation switch.

The KGB-III multifunctional desktop fully automatic ratio tester, independently developed and produced by Wuhan Kegang Power Electrical Co., Ltd., not only fully meets the on-site usage requirements of users with simple operation, complete functions, and stable and reliable data but is also the first domestically to be capable of blind testing (accurately measuring the ratio value and group number without knowing any nameplate parameters of the transformer being tested, while also accurately measuring the phase angle).

The KGB-III fully automatic transformer ratio group tester can adapt to the needs of various sizes of transformers for ratio testing (including Z-type transformers, rectifier transformers, electric furnace transformers, non-integral phase-shifting transformers, balancing transformers, Scott and inverse Scott transformers). It is currently the most technologically advanced and comprehensive in terms of tested items and measured parameters among domestic ratio testers.

The KGB-III fully automatic transformer ratio group tester uses an engineering plastic casing independently designed and molded by our company, making the instrument aesthetically pleasing and practical. It is convenient for on-site testing operations.

1. True three-phase testing: Single-phase power input, with an internally synthesized digital three-phase standard sine wave signal source, produces a three-phase test power supply (with distortion less than 0.1% and symmetry better than 0.05%) through a high-fidelity power amplifier. The test results have better equivalence and avoid misjudgment of group numbers.

2. Powerful functionality: Capable of performing both single-phase measurements and automatic testing of three-phase windings. Both single-phase and three-phase can measure polarity, phase angle, and complete the measurement of ratio values, phase angles, errors, tap positions, tap values, etc., for phases AB, BC, CA in one go. It can automatically identify group numbers.

3. Phase angle measurement function: Accurately measures the phase angle between high and low voltage sides, suitable for measuring ratios and angles of non-integral transformers.

4. Hexagonal diagram display function: Test results are displayed in numerical form and hexagonal vector diagrams, providing an intuitive view of the transformer connection group situation.

5. Blind testing function: No need to select wiring methods or group numbers; Y/△ and △/Y transformers can be tested without external shorting. The instrument automatically switches wiring methods based on selected test content, enabling the measurement of ratios and group numbers for transformers without nameplates.

6. Tap testing: Quickly measures the ratio and ratio error at various tap switch positions. Only needs to input the rated ratio once, avoiding repeated entries to calculate the ratio error at each tap position.

7. Features both turn ratio measurement and operating voltage ratio measurement functions. Operating voltage ratio more accurately reflects the actual voltage ratio under real operating conditions of the transformer.

8. Good anti-vibration performance: Military-grade connectors enhance anti-vibration capabilities.

9. Equipped with a 5.6-inch high-definition true color LCD screen, providing clear and detailed displays of data and vector diagrams.

10. Uses a digitally synthesized standard sine digital source as the test source, with distortion less than 0.1%, unaffected by the quality of the working power supply.

11. Portable: Compact size and lightweight design.

12. Built-in high-capacity lithium-ion rechargeable battery allows for testing without any external power source on-site. A full charge supports over 800 consecutive measurements.

1. Ratio measurement range: 0.9~10000.

2. Fast measurement speed: Completes three-phase testing within 1 minute.

3. Measurement accuracy:

- High-voltage side voltage measurement accuracy: 0.05%

- Low-voltage side voltage measurement accuracy: 0.1%

- Phase angle measurement accuracy: 0.1°

- Ratio measurement accuracy: 0.1% (0.9-1000), 0.2% (1000-3000), 0.3% (3000-10000)

- Customizable full-scale 0.1 class equipment available upon user request.

4. Portable and suitable for field work.

5. Weight: 3Kg.