Huazheng HZ-3310B Three Phase Transformer DC Resistance Tester

To meet the requirement for rapid DC resistance measurement of transformers, our company has developed a three-channel DC resistance tester specifically designed for YN-connected windings. The tester offers several advanced features, including simultaneous energization of all three phases, independent current and voltage sampling, and the ability to simultaneously measure and display the three-phase resistance values and the three-phase unbalance rate. This significantly reduces the test time required for measuring the DC resistance of transformers and addresses the issue of long test durations for each tapped winding of electric power transformers. The tester requires only one-third of the time compared to traditional methods.

II. Functional Characteristics

1.The tester can automatically select the appropriate output current 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 delta-connected low-voltage windings, the tester can operate in both HV and LV series excitation modes. The magnetic augment circuit for the windings is automatically connected, allowing for quick and accurate testing of the DC resistance in the low-voltage windings.

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

4.The tester allows you to set the winding material (e.g., copper or aluminum), enabling the system to adjust for the temperature conversion coefficient based on the material used.

5.Equipped with a neutral point lead-line resistance detection function for transformer YN windings, the tester ensures that three-phase test data is closer to the single-phase test value.

6.The tester features a complete protection circuit and an audible discharge alarm with clear discharge indicators to reduce the risk of misoperation.

7.The tester is equipped with a 7-inch color touch screen that clearly displays real-time test data.

8.The tester offers Chinese and English operation interfaces, which can be configured according to user preferences.

9.The tester has an RS232 communication port for transmitting test data to the host computer, along with control software for data management.

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

11.The tester has a built-in calendar and clock, and can store up to 100 test data sets. It also offers review and printing functions for test results.

12.The tester includes comprehensive parameter settings, including test windings, tapping positions, test phases, sample temperature, conversion temperature, and other relevant transformer parameters.

13.The tester is housed in an industrial plastic case, ensuring good portability and enhancing its service life.