TRANSFORMER TESTS AND MEASUREMENTS
Previously, we have discussed that a Power Transformer is the biggest, heaviest and the most expensive piece of equipment that can be found in a substation. Furthermore, the role it plays in the system is also very important that an electric utility can not afford to loss it during its operation. Proper care and maintenance are always carefully observed to ensure that a power transformer is in its top performance. Making sure that it performs well is a priority in every electric distribution utility much more to a commercial company that depends on electric power for its production and a loss of power means also a loss of revenue.
Previously, we have discussed that a Power Transformer is the biggest, heaviest and the most expensive piece of equipment that can be found in a substation. Furthermore, the role it plays in the system is also very important that an electric utility can not afford to loss it during its operation. Proper care and maintenance are always carefully observed to ensure that a power transformer is in its top performance. Making sure that it performs well is a priority in every electric distribution utility much more to a commercial company that depends on electric power for its production and a loss of power means also a loss of revenue.To make sure that a transformer is doing its expected performance and future failures could be avoided, tests and measurements are periodically exercised to know whether the said transformer is doing fine or will it need to be replaced. Due to the complexity of the transformer’s construction and operation, plenty of tests are usually done and some of them are the following;
ROUTINE TESTS
1. Measurement of winding resistance
2. Measurement of voltage ratio and check of phase displacement
3. Measurement of short-circuit impedance and load loss
4. Measurement of no-load loss and current
5. Dielectric tests
6. Separate source AC withstand voltage test
7. Induced AC voltage test
8. Partial-discharge measurement
9. Tests on on-load tap-changers
TYPE TESTS
10. Temperature-rise test
11. Lightning-Impulse tests
SPECIAL TESTS
12. Switching impulse voltage test
13. Measurement of dissipation factor (tan S) and capacitance
14. Measurement of zero sequence impedance(s)
15. Determination of sound level
16. Measurement of harmonics of the no-load current
17. Measurement of insulation resistance
For a detailed definition of the above tests please refer to a PDF file from BEST (BALIKESİR ELEKTROMEKANİK SANAYİ TESİSLERİ A.Ş.)
Source file: www.besttrafo.com
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