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Electrical tests are mainly categorized as Routine, Type and Special Tests. We
may see the |
| "Design
Test" in some standard specification which is covered by above mentioned
classification. |
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ANSI/IEEE, CSA and IEC are most commonly used standards in testing transformers. |
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| DC Resistance of Windings |
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Using Kelvine/Thomson Bridge |
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Volt Ampere Method |
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Using Digital ohm/micro ohm meters |
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Choosing the value of measuring current |
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Evaluating the results |
| Voltage (Turn) ratio, Vector
Group and Polarity Check |
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TTR using two Voltmeters |
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Polarity using DC current/using Voltmeters |
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TTR & check of Polarity using TTR Bridge |
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TTR on One phase Transformers |
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TTR on Three phase Transformers |
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TTR on Auto-Transformers |
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TTR on Transformers with special internal connection |
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Evaluating the results/Localizing failure |
| No-load loss and No-Load current |
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Supply Voltage problem |
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What is Form fctor? |
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Hysteresis and Eddy Losses and their relation |
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Measurements on Single Phase transformers |
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Measurements on three phase Transformers |
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Measurements on Traction Transformers |
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QA hints on Iron Core (Repaired Transformers) |
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How to Measure? |
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Special Test Circuit connections |
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Evaluating the results |
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Applying meters, CT and PT correction factors |
| Load-Loss and Impedance Voltage |
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What is Short-Circuit Voltage |
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Short circuit voltage related to the load current |
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Short circuit voltage related to windings temperature |
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Short circuit impedance |
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Short circuit voltage related to Frequency |
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What is Load-loss |
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Load-loss related to load current |
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Role of Windings resistance in measurement |
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Load-loss related to windings temperature |
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Load-loss related to Frequency |
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Load-loss without knowing resistance values |
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How to measure? |
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Special comments on measuring circuit |
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Special Test Circuit connections |
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Measurements on Single phase Transformers |
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Measurements on three phase Transformers |
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Evaluating the results |
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Applying meters, CT and PT correction factors |
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How precise is your Measurement? |
| Applied Potential Test |
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Measurement basics |
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Voltage Supply |
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Test transformer |
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High voltage set up |
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Role of damping resistor |
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Voltage measurement on primary side |
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How to perform the test? |
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Preparation |
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Compensation set up |
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Test duration and test Frequency |
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Evaluating the results |
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How precise is your Measurement? |
| Induced Over-Voltage Test |
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Basics and fundamentals of test circuit |
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Voltage supply |
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Inductive compensation |
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Intermediate transformer |
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Set up for Voltage and Frequency measurement |
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Voltage dividers and their effect on test circuit |
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Voltage measurement by using sphere gap |
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How to manage the test? |
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How to switch to the test object? |
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How to set up the compensation? |
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Duration of the test |
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Evaluating the results |
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How precise is your Measurement? |
| Partial Discharge Measurement |
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Measurements basics and test circuit based on IEC 270 |
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Measurement set up |
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High pass filters |
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Coupling Capacitors and related connections |
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Quadri poles and their connections |
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Measuring instruments |
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Calibration process |
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Oscillograms and some other helpful hints |
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PD levels in Test-Field (Back ground) |
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Preparing measuring and test circuit |
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Voltage measurement |
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Inception and Exception voltage |
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Trend of PD measurement |
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Evaluating the test |
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Probable reasons for higher PDs on transformers |
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How precise is your Measurement? |
| RIV Test |
To Be Continued |
| Heat Run Test (Temperature Rise
Test) |
To Be Continued |
| Lightning ans Switching Impulse
Test |
To Be Continued |
| Zero Sequence Measurements |
To Be Continued |
| Noise Level Measurement |
To Be Continued |
| Measurement of Harmonics in
No-Load current |
To Be Continued |
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