5KVA/150KV AC Test Transformer
Darui Electric recommends
5KVA/150KV Oil-immersed Test Transformer is a new type of high-voltage testing equipment. This series of products adopts a single-frame core structure, with the primary winding and high-voltage winding coaxially wound on the core, thereby reducing leakage flux and increasing coupling between windings. The overall structure is compact, versatile, and easy to carry. It is suitable for on-site testing of insulation performance of various high-voltage electrical equipment in power systems and for power users. It is an essential test instrument for power equipment testing and preventive tests.
5KVA/150KV Oil-immersed Test Transformer can be used not only for AC power frequency withstand voltage tests, but also can be assembled into a DC high-voltage test device when equipped with capacitors, silicon stacks, and high-voltage DC microammeters of the same voltage level and capacity, to measure high-voltage DC leakage current.
1. Our factory's TQSB series test transformers can achieve AC 300kV, capacity 300kVA in a single unit;
2. If needed by users, our TQSB series test transformers can have a 200V series tap extracted, allowing two or three units to be cascaded into AC 100kV, 150kV, 200kV, 300kV high voltage. According to user requirements, a 5-15kV intermediate tap can also be extracted from the high-voltage winding for AC withstand voltage tests of high-voltage motors;
3. The "DC High Voltage Output" column in the table is the DC high voltage output value of the AC/DC dual-purpose test transformer;
4. Our factory can also customize various special specifications of test transformers according to user requirements.
Operation Steps:
1. Connect the leads according to the wiring schematic diagram, and reliably ground the transformer and control box;
2. Before testing, check whether the connections at each part are in good contact, and check whether the voltage regulator of the control box is adjusted to the "zero" position;
3. Connect the power supply, the green indicator light turns on, press the start button, the red indicator light turns on, indicating that the transformer is energized and waiting for voltage increase;
4. Rotate the voltage regulator handle clockwise at a uniform speed to increase voltage, and closely monitor the instrument indications and the condition of the test object;
5. After the test is completed, quickly reduce the voltage to zero, press the stop button, then cut off the power supply and disconnect the test leads.
Precautions:
1. When conducting high-voltage tests, at least 2 or more personnel must participate, with clear division of labor and mutual communication methods. There must be a dedicated person to supervise on-site safety and observe the test status of the test object;
2. The transformer and control box should have reliable grounding;
3. During the test, the voltage increase speed should not be too fast, and sudden full voltage energization or de-energization is absolutely not allowed;
4. During voltage increase or withstand voltage tests, if any of the following abnormal conditions are found, immediately reduce voltage, cut off power, stop the test, and investigate the cause before retesting. ① The voltmeter pointer swings significantly; ② Smell of insulation burning or smoke is detected; ③ Abnormal sounds from the test object.
5. During the test, if the test object short-circuits or breaks down, the overcurrent relay in the control box will operate. At this time, return the voltage regulator to zero, cut off power, and then remove the test object.
6. When conducting capacitance tests or DC high-voltage leakage tests, after the test is completed, reduce the voltage regulator to zero, cut off power, and then use a discharge rod to discharge the high-voltage end of the test object or capacitor to ground to avoid the risk of electric shock from the potential stored in the capacitor.
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