Product Details

I. Product Overview

TQSB-5KVA/50KV Test Transformer is a new type of high-voltage testing equipment. This series of products adopts a single-frame core-type iron core structure, with the primary winding and high-voltage winding coaxially wound on the iron core, thereby reducing leakage flux and increasing coupling between windings. The overall structure is compact, with strong universality, and is easy to use and carry. It is suitable for power systems and power users to test the insulation performance of various high-voltage electrical equipment on site. It is an essential test instrument for power equipment testing and preventive tests.

In addition to AC power frequency withstand voltage tests, if equipped with capacitors, silicon stacks, and high-voltage DC microammeters of the same voltage level and capacity, it can be assembled into a DC high-voltage test device to measure high-voltage DC leakage current.



II. Model Meaning

III. Schematic Diagram



IV. Technical Requirements

1. Environmental requirements for the test transformer:

1.1 Input voltage: AC 220V or 380V, 50Hz;

1.2 Ambient temperature: -40℃～40℃;

1.3 Relative humidity: ≤85% (at ambient temperature of 25℃);

1.4 In an environment free from chemical gases and vapors;

1.5 In an environment without explosive hazardous gases;

1.6 In a place not subject to rainwater ingress.



2. Technical Parameters

Note: 1. Our factory's TQSB series test transformers can be made as a single unit up to AC 300kV, capacity 300kVA;

2. If the user needs, our factory's TQSB series test transformers can be equipped with a 200V series tap, allowing two or three units to be cascaded into AC 100kV, 150kV, 200kV, 300kV high voltage. According to user needs, a 5-15kV intermediate tap can be extracted from the high-voltage winding for AC withstand voltage testing 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 test transformers of various special specifications according to user requirements.

V. Operation Steps

1. Connect the leads according to the wiring schematic diagram, and reliably ground the transformer and control box;

2. Before the test, check whether the wiring of each part is 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 is on, press the start button, the red indicator light is on, indicating that the transformer is energized, waiting for voltage boosting;

4. Rotate the voltage regulator handle clockwise at a uniform speed to boost the voltage, and closely monitor the instrument indications and the condition of the test object;

5. After the test, quickly reduce the voltage to zero, press the stop button, then cut off the power supply, and disconnect the test leads.

VI. Precautions

1. When conducting high-voltage tests, at least 2 or more personnel must participate, with clear division of labor and clear mutual methods. There must be a dedicated person to supervise the 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 boosting speed should not be too fast, and sudden full voltage power-on or power-off is absolutely not allowed;

4. During the boosting or withstand voltage test, if any of the following abnormal conditions are found, immediately reduce the voltage, cut off the power supply, stop the test, and conduct the test again after finding out the cause. ① The voltmeter pointer swings greatly; ② An odor of burning insulation or smoke is found; ③ Abnormal sounds inside the test object.

5. During the test, if the test object is short-circuited or breaks down, the overcurrent relay in the control box will operate. At this time, return the voltage regulator to zero, and after cutting off the power supply, the test object can be removed.

6. When conducting capacitance tests or DC high-voltage leakage tests, after the test is completed, reduce the voltage regulator to zero, cut off the power supply, 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.

VII. Capacity Selection of Test Transformer

The formula for determining the rated capacity Pn of the test transformer:
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