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Huazheng HZ-3320B Transformer DC Resistance Test equipment

To meet the need for rapid measurement of transformer DC resistance, our company has developed a large-scale power transformer DC resistance tester that integrates Three-Phase simultaneous testing, Magnetic Augment Function, and Degauss Function into a single unit. This tester features simultaneous three-phase power-on, independent current and voltage sampling, and the ability to simultaneously measure and display three-phase resistance and the three-phase unbalance rate. These capabilities significantly reduce the testing time for transformer DC resistance and address the issue of long measurement times typically required for the DC resistance of each tap winding in power transformers.

     DC Resistance Test equipment (5)

    I. Functional Characteristics

    1.The tester can automatically select the corresponding output current value based on the test product and is primarily designed for measuring the inductive DC resistance of transformers.

    2.For large transformers with a five-leg core and low-voltage windings connected in delta, the tester can be used in HV & LV series excitation mode. The magnetic augment circuit for the windings .can be automatically connected, enabling quick and accurate testing of the low-voltage windings' DC resistance.

    3.The tester features a Three-Phase Test function, allowing for the synchronous measurement of the three-phase DC resistance of star-connected windings and the automatic calculation of the three-phase unbalance rate. This significantly reduces the measurement time and improves test efficiency. The phase-by-phase test function can also be used for transformers with YN and D (Y) connections.

    4.The winding material can be set according to the transformer's winding material, such as copper or aluminum, allowing for the differentiation of temperature conversion coefficients for different materials.

    5.The tester includes a YN winding neutral point lead line resistance detection function, helping make the three-phase test data closer to the single-phase test value.

    6.The tester is equipped with a complete protection circuit and a sound discharge alarm, providing a clear discharge indication and reducing the risk of misoperation.

    7.The tester is equipped with a 7-inch color touch screen to display test data clearly in real-time.

    8.The tester offers both Chinese and English operation interfaces, which can be configured based on user preferences.

    9.The tester features an RS232 communication port, allowing data transmission to a host computer with control software.

    10.The tester has a USB port for transferring test data to a U disk.

    11.The tester includes a built-in calendar and clock, with the ability to save up to 100 test data sets, review, and print test results.

    12.The tester offers more comprehensive parameter settings, including test windings, tapping positions, test phases, sample temperature, conversion temperature, and other transformer-related settings.

    13.The tester comes in an industrial plastic case, ensuring excellent portability and durability for long-term use.

    II.Technical Indicators

    1)Output current: 

    Three-phase test: 10A+10A; 5A+5A; 1A+1A; 200mA+200mA; 20mA+20mA;

    Single-phase test: 20A; 10A; 5A; 1A; 200mA; 20mA;

    2)Measurement range:

    Three-phase test: 10A+10A: 1mΩ~0.6Ω;

                              5A+5A: 2mΩ~1.2Ω;

                              1A+1A: 10mΩ~6Ω;

                              200mA+200mA: 100mΩ~30Ω;

                              20mA+20mA: 10Ω~200Ω;

        Single-phase test: 20A: 0.5mΩ~1Ω;

                        10A: 1mΩ~2Ω;

                        5A: 2mΩ~4Ω;

                        1A: 10mΩ~20Ω;

                        200mA: 100mΩ~100Ω;

                        20mA: 10Ω~20KΩ;

    3)Accuracy: ±(0.2%+2 digits);

    4)Minimum resolution: 0.1μΩ;

    5)Operating temperature: -10~40℃;

    6)Ambient humidity: ≤80%RH, no condensation;

    7)Power supply: AC220V±10%, 50Hz±1Hz;

    8)Tester dimensions: 428mm* 350mm* 230mm (L*W*H);

    9)Tester mass: 11.2kg.

     DC Resistance Test equipment (6) DC Resistance Test equipment (1)

    III.List Of Complete Accessories

    Name

    Quantity

    Transformer DC resistance tester host

    1 unit

    Dedicated test wires

    1 set

    Standard resistance

    1 unit

    Printing paper

    2 rolls

    Fuse

    2 units

    Grounding wire

    1 unit

    Power wire

    1 unit

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