in the EPSI (Three Phase) ?

General Information:

The short-circuit impedance is an important parameter of the transformer. The short-circuit impedance method is the traditional method for judging the deformation of the winding. According to the provisions of GB1094.5-2003 and IEC60076-5:2000, the change of the short-circuit reactance is the only criterion for judging whether the transformer winding is deformed.

The low-voltage short-circuit impedance test is the most direct way to determine whether the transformer is impacted by short-circuit current during operation, or the transformer is impacted by mechanical force during transportation and installation, and the most direct method to check whether the winding is deformed. It is important for judging whether the transformer can be put into operation. Significance is also one of the basis for judging whether the transformer requires disassembly inspection.

Transformer short-circuit impedance tester is an instrument used for low-voltage short-circuit impedance measurement of main transformers of 35KV and above under field and laboratory conditions. The instrument is designed with exquisite design, superior performance and powerful functions. The internal use of the latest domestic and foreign single-chip testing technology and advanced A/D synchronous AC sampling and digital signal processing technology, the measurement data is accurate; the external use large-screen color LCD display, English menu Reminder, simple operation, equipped with high-speed thermal printer, designed with storage function, convenient for data storage and printing; the saved data can be transferred to the computer via USB. The instrument is small in size, light in weight, easy to carry, and extremely convenient to use on site, which greatly reduces the labor intensity of test personnel and improves work efficiency.

Main Test Functions:

-Three-phase short-circuit impedance measurement: display three-phase voltage, three-phase current, and three-phase power; automatically calculate the impedance voltage percentage converted to the rated temperature and rated current of the transformer, and the error percentage of the impedance from the nameplate.

-Single-phase short-circuit impedance measurement: Measure the short-circuit impedance of a single-phase transformer.

-Zero-sequence impedance measurement: The zero-sequence impedance measurement is suitable for transformers with a neutral point on the high-voltage side star connection.

-It can be directly measured in the allowable measurement range of the instrument, and external voltage and current transformers can be connected beyond the measurement range.

-The instrument can set the transformation ratio of the external voltage and current transformers, and directly display the value of the applied voltage and current.

-The instrument uses large-screen color high-resolution touch LCD, English menu, easy to operate.

-The instrument comes with a printer, which can print and display data.
Built-in non-power-down memory, can store 200 groups of measurement data.

-The instrument is equipped with a U disk interface for accessing test data.
Permanent calendar, clock function, time calibration can be carried out.

-The instrument has a wide measuring range, high accuracy, and good stability; it is small in size and light in weight to facilitate measurement.

Main Specifications:

Voltage (automatic range):

15 ~ 400V ± (reading × 0.2% + 3 words) ± 0.04% (range)

Current (automatic range):

0.1020A ±(reading×0.2%+3 words) ±0.04% (range)


COSΦ 0.15 ±(reading×0.5% +3 words)

Frequency (power frequency):

4565(Hz) Measurement accuracy: ±0.1%

Short circuit impedance:

0100% Measurement accuracy: ±0.5%

Repeat stability:

ratio difference 0.2%, angle difference 0.02°


5 digits

Protection current:

the test current is greater than 18A, the internal relay of the instrument is disconnected, and overcurrent protection is provided.

Environment temperature:


Relative humidity:


Power supply:

AC 220V±10% 50Hz±1Hz


Tester: 360*290*170 (mm)

Wire box: 360*290*170 (mm)


Tester: 4.85Kg

Wire box: 5.15KG