Low voltage short-circuit impedance measurement is a basic item in the routine test of transformers. By comparing the short-circuit impedance values measured before and after the transformer is subjected to the impact of short-circuit current, the degree of winding deformation can be preliminarily estimated. Low voltage short-circuit impedance test is the most direct method to identify whether the winding of a transformer is deformed after being impacted by short-circuit current during operation or mechanical force during transportation and installation. It is of great significance for determining whether the transformer can be put into operation and is also one of the basis for determining whether disassembly inspection is required for the transformer.

The transformer short-circuit impedance tester is an instrument developed by our company for measuring low-voltage short-circuit impedance of transformers under on-site and laboratory conditions. The instrument is small in size and light in weight. The instrument adopts voltage and current synchronous AC sampling and digital signal processing technology internally, ensuring accurate measurement data. For three-phase transformers, instruments can use both three-phase simultaneous testing and phase separation testing methods to test the transformer: three-phase simultaneous testing uses a three-phase power supply, which can directly measure three-phase parameters; The phase separation test uses a single-phase power supply, and after measuring the corresponding phases in sequence, the three-phase parameters are automatically converted. For single-phase transformers, the instrument has the function of testing single-phase transformers and can directly test their impedance parameters. The instrument is equipped with a built-in power-off memory, which can store measurement data for a long time. The instrument comes with a printer, a large LCD display, all Chinese menus and operation prompts, making the operation simple and intuitive.

Product nickname: Transformer Short Circuit Impedance Tester, Impedance Tester.

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1. Measurement of short-circuit impedance: Used for low-voltage short-circuit impedance experiments of transformers, it can display measurement parameters such as voltage, current, active power, impedance value, impedance voltage percentage, reactance value, leakage inductance value, etc. in three-phase or single-phase on the same screen;

2. Measurement of no-load loss: The instrument displays the three-phase voltage, three-phase current, and three-phase power. The instrument displays the distortion rate of the applied power waveform and calculates the percentage of no-load current and no-load loss of the transformer;

3. Measurement of load loss: displays three-phase voltage, three-phase current, and three-phase power, automatically calculates the impedance voltage percentage of the transformer, converts it to load loss at rated temperature and rated current, and the instrument has frequency conversion function, which can accurately measure over a wide frequency range;

4. Phase separation measurement: used to check for defects in single-phase windings of three-phase transformers or situations where there is no three-phase power supply on site. The phase separation test uses a single-phase power supply, and after measuring each single-phase data separately, it can be automatically converted into three-phase parameters;

5. Measurement of zero sequence impedance: The measurement of zero sequence impedance is suitable for transformers with star connections and neutral points on the high voltage side. The instrument can record zero sequence impedance, zero sequence reactance, zero sequence inductance, impedance angle, and zero sequence resistance;

6. The instrument has harmonic analysis function, which can measure the content and total distortion rate of multiple harmonics, and has original waveform and bar chart display;

7. The instrument has a large screen LCD display that can display three-phase voltage, three-phase current, three-phase power, three-phase impedance value, three-phase impedance voltage percentage, three-phase reactance value, three-phase leakage inductance value, three-phase average voltage, average current, three-phase total power, and related data on the same screen. The instrument adopts a Chinese menu, Chinese prompts, and simple operation;

8. The instrument is equipped with a USB interface, which allows the data stored in the instrument to be imported into the USB at any time. During instrument testing, it can be directly stored on the USB;

9. Built in memory, not lost in case of power failure, the instrument can store 400 sets of data;

11. The system comes with a printer that can print test data and memory browsing data;

12. Permanent calendar and clock functions, capable of time calibration;