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How to use dry test transformer correctly?

time:2021/11/8   source:华天电力  reading:733 time

In terms of the insulation structure layout, according to the principle of the "distance effect" of the positioner oil, multi-layer insulation is adopted, and the internal insulation of the transformer is divided into multiple oil passages, thereby improving the degree of insulation and reducing the volume.


Instructions


The input end of the test transformer control box is connected to the power supply 220V, the output end is connected to the input end of the transformer, the grounding end of the control box and the high voltage tail end and grounding end of the transformer are grounded together.


Hipot Test Set (Dry Type).png


Connect the high-voltage silicon stack to the high-voltage output end of the transformer, connect the high-voltage digital micro-ammeter to the pile head of the high-voltage silicon pile, and connect the high-voltage filter capacitor high-voltage head to the pile head of the high-voltage silicon pile. (If you do a cable leakage test , The high-voltage filter capacitor can not be connected), the high-voltage digital micro-ammeter output line is connected to the tested product (digital micro-ampere meter output should be suspended), the other end of the tested product and the ground terminal of the filter capacitor and the ground terminal of the discharge rod Both are grounded.


Before turning on the power, the voltage regulator of the control box must be adjusted to the zero position. (If the voltage regulator is not in the zero position, it cannot be started). After the power is turned on, the green indicator light is on, press the start button, and the red indicator light is on to indicate that the transformer has been energized and is waiting to rise. Pressure.)


Rotate the regulator handle clockwise at a constant speed to increase the pressure, and pay close attention to the instrument and the high-voltage digital micro-ammeter and the test product.


After the high voltage test is completed, the high voltage should be reduced to less than 20KV at a uniform speed within 5 seconds, and then press the disconnect button and cut off the power supply.Unless the test permits, the sudden power failure is never allowed.


Cut off the power supply, and use the high-voltage head of the discharge rod to touch the high-voltage head of the high-voltage filter capacitor or the upper pile head of the high-voltage silicon stack to discharge. When the discharge is completed, a "squeak" sound will be emitted. After the discharge is completed, use the grounding of the discharge rod The terminal touches the high voltage head of the high voltage filter capacitor to discharge to ensure personal safety.


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