When selecting a test transformer, the following factors should be taken into account:

发布时间：2022-04-12

Experimental transformers are characterized by their small size, light weight, compact construction, comprehensive functionality, strong versatility, and ease of use. They are particularly well suited for power systems, industrial and mining enterprises, research institutions, and other organizations that conduct dielectric strength tests on various high-voltage electrical equipment, electrical components, and insulating materials under power-frequency or DC high voltage. As such, they are indispensable and critical equipment in high-voltage testing. When selecting an experimental transformer, the following factors should be considered: voltage. Starting with the test object, the first consideration is the transformer’s rated voltage on the high-voltage side, which should exceed the test voltage of the device under test. In addition, it is essential to ensure that the low-voltage side of the transformer is compatible with the on-site testing conditions. According to regulations, the voltage ratings of experimental transformers in China include 5, 10, 25, 35, 50, 100, 150, and 300 kV.

Current: The rated output current of the test transformer should exceed the current required by the device under test. The current magnitude can be estimated based on the capacitance. Capacity: Based on the test transformer’s rated current, rated voltage, and the formula P = UnIn, the transformer’s capacity can be determined. According to regulations, the standard capacity ratings for test transformers in China are 3, 5, 10, 25, 50, 100, 150, and 200 kVA.

For example: In terms of voltage rating, a distribution transformer has a rating of 10 kV and a capacity of 1000 kVA, while the test specimen is also rated at 10 kV. In this case, a test transformer rated at 50 kV and 5 kVA would be suitable. Since the factory‑tested withstand voltage for the 10 kV, 1000 kVA distribution transformer is 35 kV, with an AC test voltage of 30 kV, the selected transformer can readily meet the requirements for testing 10 kV insulators, high‑voltage switchgear, and performing DC tests on 10 kV cables. Regarding test capacity, the chosen test transformer must have a rating greater than the capacitive current of the test specimen. Typically, the test transformer’s capacity is set at 5‰ of the tested equipment’s (e.g., power transformer) rated capacity. When selecting a test transformer, users often encounter difficulties in making the right choice; if you are unsure which model to select, our professional sales team can help you choose the most appropriate unit, ensuring a more reliable and precise solution.

This is how to perform daily maintenance and upkeep of AC/DC test transformers.

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This is how to perform daily maintenance and upkeep of AC/DC test transformers.

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