3 Phase TTR Tester Chinese TTR Tester Manufacturer

Why do variable ratio tests sometimes fail or exceed the allowable error?

You may encounter situations where the test results exceed the error limit or the test fails. Based on actual on-site experience, common reasons include:

• Poor contact of test clip

• Internal inter turn short circuit of transformer

• Wrong position of tap changer

• Test voltage is affected by external power interference

What changes have we made to address these issues?

In the design of GDBC-901, we have specifically incorporated several response measures:

1. Reverse connection protection unit: prevents accidental injection of high voltage into the operating end

2. Test voltage regeneration technology: Regenerate AC test voltage from the power supply to reduce the impact of poor power supply

3. Overcurrent protection: Automatic interruption when overcurrent occurs in the test voltage

4. Excitation current measurement: helps you determine whether there is a turn to turn short circuit or magnetic circuit abnormality

These are not 'theoretical functions', but practical solutions that we gradually incorporate after seeing a large number of failed on-site testing cases.

The equipment is mainly used to measure the voltage transformation ratio of three-phase or single-phase transformers, and also supports the transformation ratio testing of current transformers and voltage transformers. The device will output a safe test voltage, automatically calculate the transformation ratio error and excitation current, and also identify the wiring group and polarity of the transformer.

The measurement range of the variable ratio is from 1 to 10000, with an error of ± 0.2% in the range of 1-2000 and ± 0.5% in the range of 2000-10000.

This accuracy is sufficient for daily preventive maintenance, troubleshooting, and acceptance testing before the transformer is put into operation. introduction photo introduction photo introduction photo introduction..

Parameters

Product advantages

1. Easy to operate: With one knob and press confirmation, all operations can be completed

2. Clear results: 320 × 240 LCD screen, displaying test results, errors, groups, and excitation current on one screen

3. Data can be saved: multiple sets of test results can be stored, and RS232 upload is supported to generate reports on the computer

4. Comes with a mini printer: print directly after testing, no need to copy by hand

5. Lightweight: 7kg, suitable for on-site carrying

Application scenarios

• Scenario 1: Acceptance of Distribution Transformers Before Operation

  Confirm whether the transformation ratio is consistent with the nameplate. Set the standard ratio and connection method, press start, and the result will be displayed within 30 seconds.

  
  

• Scenario 2: CT polarity verification of substation

  Connect device A and B to the CT secondary side, and connect device A and B to the primary side. The device will automatically determine whether the polarity is consistent.

  
  

• Scenario 3: Multi tap changer transformer testing

  Capable of testing 10kV/380V five level transformers and automatically calculating the transformation ratio range in 2% steps.

Contact us

Contact Person: Christine 

Mobile/Whatsapp/Wechat: +86 15123029885

Email: gold05@hy-industry.com