How to handle the testing report of the sample? What are the scope and standards of testing? Today, the editor of Baijian Testing will take you to understand the specific tests required for the relevant testing business. At the same time, Baijian can also design testing plans based on corresponding testing standards or according to your needs

Testing process

1. Sending samples

2. Checking requirements

3. Targeted quotation

4. Both parties confirm, sign a contract, and start the experiment

5. Completing the experiment: The testing cycle (can be expedited) may change according to the sample and its testing items/methods, and engineers can be consulted

6. Issuing the testing report and providing post service.

Testing items:

Partial parameters, winding to ground insulation resistance, short-circuit impedance and load loss measurement, no-load current and no-load loss measurement, winding resistance measurement, sealing test, all parameters, vacuum deformation test of liquid immersed transformer, pressure sealing test of liquid immersed transformer, mechanical strength (positive pressure) test of oil tank, transient voltage transmission characteristics measurement, external coating inspection, sound level measurement for each cooling method, pressure sealing test of inflatable transformer oil tank, insulation inspection of iron core and clamp of liquid immersed transformer, on load tap changer test, mechanical test or evaluation of oil tank transportation adaptability, on-site vacuum sealing test of liquid immersed transformer, temperature rise test, pressure deformation test of liquid immersed transformer, three-phase transportation adaptability mechanical test or evaluation, on-site vacuum sealing test of liquid immersed transformer, temperature rise test, pressure deformation test of liquid immersed transformer, Transformer zero sequence impedance measurement, sealing test, internal current transformer ratio and polarity test, transportation quality measurement, no-load loss and current measurement, fan and oil pump motor power measurement, insulation routine test, insulation resistance measurement, voltage ratio measurement and connection group label verification, winding to ground and winding to winding capacitance measurement, insulation special test, insulation type test, insulation liquid dissolved gas measurement, frequency response measurement, Measurement of winding DC resistance imbalance rate, measurement of winding to ground and winding to winding DC insulation resistance, short-circuit withstand capacity test, measurement of winding hot spot temperature rise, insulation liquid test, measurement of no-load loss and no-load current at 90% and 110% rated voltage, sound level measurement, external withstand voltage test, induced withstand voltage test, lightning impulse test, transformer winding DC resistance imbalance rate, measured value of transformer insulation resistance, transformer sealing test, mechanical strength (positive pressure) test of transformer oil tank and storage tank (if any), marking, lifting, packaging, transportation and storage,/, oil temperature measurement device, technical requirements for transformer oil tank and its accessories, mechanical strength, DC resistance imbalance rate, oil protection device, insulation resistance, safety protection device

Testing standards:

1. GB/T 25438-2010 Technical parameters and requirements for three-phase oil immersed three-dimensional coil core distribution transformers GB/T 25438-2010

2. GB/T 25438-2010 Technical parameters and requirements for three-phase oil immersed three-dimensional coil core distribution transformers

3. GB/T 1094.1-2013 Sound level determination for each cooling method

4 GB/T25438-2010 Technical parameters and requirements for three-phase oil immersed three-dimensional coil iron core distribution transformers

5. GB 20052-2013 mechanical strength

100% inspection process:

1. Telephone communication and confirmation of requirements 2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is required