According to IEC and relevant national standards, transformer ratio test is a necessary item in the process of power transformer production, user handover and maintenance test. This can effectively supervise the quality of transformer products in the process of leaving factory and using, prevent transformer turn-to-turn short circuit, open circuit, connection error, internal fault or contact fault of voltage regulator switch. Our company independently developed and manufactured the multi-functional desktop automatic ratio tester, which is not only based on the user's field use requirements, easy to operate, complete functions, stable and reliable data, but also the first one in China so far to be able to blind test (without knowing any nameplate parameters of the transformer under test, accurately measure the ratio and group number, at the same time accurate). The hand-held variable ratio tester which can measure phase angle accurately can meet the needs of various large and medium transformers (including Z-type transformer, rectifier transformer, electric furnace transformer, non-integer phase change, balance transformer, Scott transformer and inverse Scott transformer). It is the most advanced technology, the most perfect test item and the most comprehensive variable ratio tester for measuring parameters in China so far.

The instrument uses large screen true color LCD as display, full Chinese graphical operation interface and LCD display interface with Chinese character prompt information and multi-parameter display. The man-machine dialogue interface is friendly. Vector graph display and wiring judgment provide a reliable basis for checking the correctness of the circuit. Full touch conductive silicone keyboard operation mode, good handle, easy to learn. The instrument has built-in large-capacity power-down and no loss of data memory. It can save the field verification data. It can expand to store up to 1000 sets of field verification results. It can provide background computer management software. It can transfer the results to the computer through U disk, produce report forms and print, and realize computerized management.

1. Variable ratio measurement range: 0.8-10000.

2. Fast measurement speed: three-phase test can be completed in 1 minute.

3. Measurement accuracy: The measurement accuracy of high voltage side voltage is 0.05%.

The measurement accuracy of low voltage side voltage is 0.1%.

Accuracy of phase angle measurement: 0.1 degree

The accuracy of variable ratio measurement is 0.1%(0.8-3000)

0.2% (3000-10000)

Full range 0.1 level equipment can be customized according to user's requirements

4. Easy to carry and suitable for field work.

5. Weight: 3Kg.

1. Real three-phase test: single-phase power supply input, internal digital synthesis of three-phase standard sine wave signal source, through high fidelity power amplifier, three-phase test power supply (distortion less than 0.1%, symmetry better than 0.05%) output, test results have better equivalence, will not appear group misjudgement and other phenomena.

2. Powerful function: It can measure single-phase and three-phase windings automatically. Single-phase and three-phase windings can measure polarity and phase angle. It can measure the variable ratio, phase angle, error, tap position and tap value of AB, BC and CA three-phase at one time, and can automatically identify the group number.

3. Phase angle measurement function: accurately measure the phase angle between high and low voltage sides, and can measure the ratio and angle of non-integral transformer.

4. Hexagonal Diagram Display Function: The test results are displayed by digital and hexagonal vector diagrams, and the connection groups of transformers can be seen intuitively.

5. Blind test function: There is no need to choose the connection mode, no need to select the connection group, no need to shorten the external connection of Y/Delta and Delta/Y transformer, and the connection mode can be automatically switched according to the selected test content. It is possible to measure the ratio and group number of transformers without nameplates.

6. Tap-changer test: It can quickly measure the variable ratio and error of each tap-changer position. Rated variable ratio needs only one input, and the variable ratio error of each tap-changer position can be calculated without repeated input.

7. At the same time, it has two functions: turn ratio measurement and operation voltage ratio measurement. Operation ratio can reflect the actual value of voltage ratio in the actual operation of transformer more truthfully.

8. Good anti-vibration performance: The use of military connectors enhances the anti-vibration performance.

9. The 5.6 inch high halal color LCD screen is used to display the data effect and the vector image effect intuitively and delicately.

10. The test source used in this instrument is the standard sinusoidal digital source for digital synthesis. The distortion is less than 0.1%, which is not affected by the quality of the working power supply.

11. Easy to carry: small size, light weight.

12. High capacity lithium-ion rechargeable batteries can be optionally installed. The test can be completed without any power supply on site, and more than 800 consecutive measurements can be made with one charge.