I. Product Introduction

The  HZZH-3  Transformer  Comprehensive  Tester  integrates  a  DC  resistance tester, demagnetization tester  and transformer ratio tester into one  device  for  testing large power transformers.

II. Product Features

 Product Design

1.  One-time  wiring  completes  all  test  items,  reducing  the  workload  of  on-site testers.

2.  Equipped  with  a  7-inch  color  touch  LCD  screen  for  control  and  display, providing a user-friendly interface.

3.  Built-in micro printer for on-site printing of test results.

4.  USB storage function for external storage of test results.

5.  One isolated RS232  communication interface  with   standard   protocol communication.

6.  Bluetooth communication  module  with  standard  protocol  wireless communication.

7.  High-reliability RS485 bus for internal communication.

8.  Isolated   circuit   design   to   eliminate   interference   between   test   functions; hardware and software filtering to improve anti-interference capability; good grounding and shielding measures to enhance overall anti-interference capability.

  DC Resistance Test

1. Three-phase simultaneous testing and automatic magnetization.

2. High and low voltage current and potential test leads can be connected to the transformer at once, eliminating the need to switch test leads during the test.

3. For star-connected windings with a neutral point, the A0, B0, and C0 phase resistances can be tested simultaneously, significantly saving test time.

4.  For   an   internally   delta-connected   three-phase   five-limb   transformer,  the automatic excitation method can be used during low-voltage side testing, which offers fast testing speed.

5. Displays and prints all test data of high, medium, and low voltage windings, automatically calculates three-phase unbalance, and prints resistance values converted to rated temperature.

6. Comprehensive back EMF protection.

 Transformer demagnetization Test

1. Fast demagnetization with obvious effects.

2. Fully automatic and manual demagnetization functions, with a progress bar and percentage displayed during demagnetization.

3. Comprehensive back EMF protection.

4.  Suitable  for  eliminating  residual  magnetism  in  large  power  transformers  of 35kV and above before operation.

5.  Automatic  current   stabilization  judgment,   data  acquisition,  and  processing functions.

6. One-button operation, strong anti-interference ability.

7. Can directly use the current leads of the DC resistance test, convenient for use with the DC resistance test.

 Transformer Ratio Test

1.  Chinese/English menu prompts, simple and convenient operation.

2.  Three-phase  testing  only requires  inputting the high-voltage  side  connection method to automatically measure the group.

3.  Capable of both single-phase measurement and automatic testing of three-phase windings.   The    connection   group    can   be    arbitrarily    selected,   completing    the measurement of parameters such as the ratio, error, and connection group of AB, BC, and CA phases in one go.

4.  Protection function for high and low voltage reverse connection.

5.  Fast testing speed, completing single-phase testing in 15 seconds.

6.  Protection functions for transformer short-circuit and inter-turn short-circuit.