Comparison of testing results of Oil-immersed Transformer under Linear load and Non-linear load conditions
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Abstract
This research is a comparison of test results of three-phase transformer ,D/Y, 10 kVA, 380V/220V, ONAN cooling under linear and non-linear load. The purpose is to study the voltage, current, electrical power, , , temperature of winding, temperature of oil and temperature of neutral wire. Test procedure K type thermocouples are installed at the coil and at the top of the transformer oil. The first test use a linear load, it consists of heater and incandescent lamp. The second test use a non-linear load, it consists of bridge rectifier, capacitor, heater and incandescent lamp. Use digital oscilloscope and power meter to measure and record electrical parameter values and use data acquisition module to measure and record temperature of transformer. The results indicate that the current of transformer, winding temperature of transformer when of non-linear loads are higher than linear loads of 1.38 times, 24 times and 1.5 times respectively. The benefit of this research is possible to plan the load on the transformer to prevent the transformer from overheating.
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References
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