For the power system, transformers are the core equipment in the system, so the long-term and reliable operation of transformers is related to the stability and reliability of the entire system. The DC resistance of transformers is a necessary test item for semi-finished and finished products in transformer manufacturing, factory testing, installation, handover testing, and preventive testing by the power department. It can effectively detect manufacturing defects such as material selection, welding, loose connection parts, missing strands, and broken wires of transformer coils, as well as hidden dangers after operation. In order to meet the needs...

During the production process of semi-finished and finished power transformers, before newly installed transformers are put into operation, and in accordance with the preventive test regulations of the Ministry of Electric Power of the People's Republic of China, transformers are required to undergo turns ratio or voltage ratio tests. The traditional ratio bridge is cumbersome to operate, the readings are not intuitive, and necessary conversions are required. During testing, it can only be conducted on a single phase, resulting in low working efficiency. This series of instruments overcomes the shortcomings of traditional ratio bridge testing. The...

The short-circuit impedance method is a traditional method for determining winding deformation. According to GB1094.5-2003 and IEC60076-5:2000, the change in short-circuit reactance is the only criterion for determining whether the transformer winding is deformed. The circuit design of this instrument is exquisite, with unique ideas, superior performance, small size, light weight, and easy on-site use. The instrument adopts advanced synchronous AC sampling and digital signal processing technology internally, with accurate and reliable measurement data. It is an effective tool for transformer detection and analysis, and can also be used for impedance measurement of equipment such as...