Test methods and acceptance standards for power transformers

The testing methods and acceptance standards for power transformers involve multiple aspects, including installation quality inspection, various testing methods, and the final acceptance process. The following is a detailed explanation of these contents:

###1、 Quality inspection of power transformer installation

1. * * Appearance inspection * *: Check whether the appearance of the transformer is intact, whether there is any damage, deformation, rust, or other phenomena.

2. * * Internal inspection * *: Check whether the internal components of the transformer are intact, including whether there is looseness, damage, aging, etc.

3. Insulation performance testing: Ensure that the insulation performance of the transformer meets the requirements through testing, and detect whether there are problems such as leakage and breakdown.

4. Grounding performance testing: Verify whether the grounding performance of the transformer is reliable and check whether the grounding resistance is too high.

5. * * Performance testing * *: During the operation of the transformer, check its noise, vibration, temperature and other parameters to ensure normal performance.

###2、 Test methods for power transformers

1. * * Load Test * *: Test the performance and operating status of the transformer under rated load conditions, observe parameters such as current and voltage.

2. * * Insulation test * *: including withstand voltage test and insulation resistance test, used to evaluate the ability of transformer insulation materials.

-Voltage withstand test: Conduct a voltage test on the transformer at a specified voltage and time.

-Insulation resistance test: measure the resistance value of the transformer insulation system.

3. * * Temperature rise test * *: Test the temperature rise of the transformer under rated load and evaluate its heat dissipation performance.

4. * * Short circuit test * *: Test the transformer's ability to withstand short-circuit current and observe its operating status.

In addition, overvoltage tests, impulse voltage tests, etc. can be conducted as needed.

###3、 Acceptance criteria for power transformers

1. Appearance and wiring inspection: Ensure that the appearance of the transformer is intact, the wiring is correct, and there is no looseness.

2. Installation position inspection: Verify whether the installation position of the transformer meets the design requirements.

3. * * Performance parameter testing * *: including insulation resistance, DC resistance, AC withstand voltage and other tests to ensure that all parameters comply with relevant standards.

4. * * Operation check * *: Check whether the sound, temperature, oil level, etc. of the transformer are normal during operation.

5. * * Protection device inspection * *: Verify whether the protection device of the transformer is complete and functioning properly.

National standards such as GB/T17468-2008 "Code for Acceptance of Installation of Power Transformers" should be referred to during the acceptance process.

###4、 Summary

The testing methods and acceptance standards for power transformers are important steps in ensuring their safe and stable operation. Through strict installation quality inspection, the application of various testing methods, and the final acceptance process, it can be ensured that the transformer meets all relevant standards and requirements before being put into operation.