Electric transformer AC withstand voltage test standards and precautions

Power transformer AC voltage withstand test standards and precautions 1) Check to ensure correct test connection, should be grounded, the protective gas should be put into trial winding transformer housing with non-pressurized, the test circuit overcurrent overvoltage protection setting should correct and reliable. 2) When the transformer AC voltage test, must be at a standstill in the insulating oil, only after sufficient bubbles to escape. Otherwise the pressure test process will lead to discharge, resulting in difficulties in judgment. 3-10kV transformer oil needs to be more than 5h, 110kV and below transformer oil still 24 hours; 220kV transformer oil still 48h, 500kV transformer oil is 72h to avoid pressure, there should be no insulation breakdown. 3) All the parts can be deflated oil power transformer bushing, into a hole or the like should be sufficient to open the exhaust gas, in order to avoid trapped air is reduced dielectric strength, leading to breakdown or discharge. 4) During the test, the boosting speed should be uniform, when the voltage of the test voltage was raised to 40% or more, should be kept 3% increase per test voltage; buck should quickly, but to avoid a sudden power cut 40% more than the test voltage . 5) three-phase transformer AC power frequency voltage withstand test is not necessary for phase separation, but the lead end of the three-phase windings must be shorted to the same side of the test, or it may damage the insulation of the transformer winding. 6) time of 1min AC voltage if discharge breakdown occurs or, immediately down and cut off the power. Closely monitor 7) during the dynamic pressure meter indication, observation, monitoring the transformer under test, and the protection of voice phenomena ball gap, the difference between analysis corona discharge or other relevant evidence. , Reading the full text, the technology area Influence and set the standard carrier frequency inverter A capacitive voltage transformer CVT Internal Structure What is the main difference between magnetic and capacitive voltage transformer is Capacitor voltage transformer wiring principle Capacitive Voltage Transformers Protocol

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