When the transformer operates in the power grid, it not only has to bear the action of voltage and current in normal operation, but also bear the action of various short-term abnormal voltage and current. Therefore, the transformer must be designed and manufactured to have sufficient safety and reliability. Safety and reliability should include several aspects such as electrical insulation strength, thermal performance and mechanical strength.

The electrical insulation strength of the transformer is one of the basic conditions for the reliable operation of the transformer. The issues to be considered in the electrical insulation strength of transformers are: to understand what kinds of voltages the transformers in the power grid will be exposed to, and what test methods to use to test whether the transformers can withstand the effects of these voltages; to understand the various parts of the windings The ability to withstand these voltages and the insulating properties of the various insulating materials and structures used in each component.

In order to ensure that the transformers delivered from the factory meet the requirements of safe and reliable operation, in addition to the insulation performance and electrical performance of the transformers to meet the national standards, the insulation electrical strength of the transformers must also meet the requirements. The electrical strength of the transformer is a necessary condition for assessing the safe and reliable operation of the transformer under normal working voltage and abnormal conditions (such as lightning overvoltage, operating overvoltage, etc.). Only through the assessment of these applied voltages and partial discharges, can it be said that the transformer has the basic conditions for on-grid operation.

Therefore, each transformer should be subjected to tests such as short-time power frequency withstand voltage, impulse withstand voltage and partial discharge measurement.

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GDYD-A seriesAutomatic hipot test set is a new type of intelligent withstand voltage test equipment with advanced performance designed by HV Hipot on the basis of GDYD-D type and according to the latest national power industry standards. Rigorous, efficient and direct method for identifying the dielectric strength of electrical equipment. It can check out those concentrated defects that are more dangerous, and has a decisive role in judging whether the power equipment can continue to participate in the operation. It is an important means to ensure the insulation level of the equipment and avoid the occurrence of insulation accidents. It is used to conduct the dielectric strength test under the specified voltage for various electrical products, electrical components, insulating materials, etc., to assess the insulation level of the product, find the insulation defect of the tested product, and measure the ability of overvoltage. Widely used in electrical manufacturing departments, power operation departments, scientific research units and institutions of higher learning.