Multi-voltage output intermediate transformer

Abstract

The invention discloses a multi-voltage output intermediate transformer. The multi-voltage output intermediate transformer comprises a low-voltage coil, a medium-voltage coil and a high-voltage coil, wherein the low-voltage coil adopts delta connection, a wire is led out from the upper end of a low-voltage side, the medium-voltage coil adopts star type connection, a wire is led out from the lower end of the low-voltage side, the high-voltage coil adopts star type connection, a wire is led out from the upper end of a high-voltage side, a tap is added, and a group of voltage output is increased. The intermediate transformer has intermediate and high voltage multi-stage output, and electric excitation-free tap switch is matched with the intermediate transformer for regulation, so that the requirement that a transformer test is carried out under different high voltage levels can be met.

Description

technical field [0001] The invention relates to a multi-voltage output transformer, in particular to a multi-voltage output intermediate transformer for testing. Background technique [0002] At present, in the transformer test, it is necessary to carry out multiple tests on the transformer such as no-load, load, and temperature rise. Since the high voltage and low voltage of different tested transformers cannot be the same, different voltage levels are required to meet the requirements of the transformer test. Generally, a voltage regulator is used for power supply, but the output range of the voltage regulator is mostly below 0.8kV. For high voltage levels of 20kV, 35kV, 110kV and above, the existing voltage regulators cannot meet the test requirements and have limitations. There are also manufacturers who use transformers with the same voltage ratio and the same voltage level as temporary intermediate transformers instead of test transformers, but this method is not suita...

AI Technical Summary

Problems solved by technology

Generally, a voltage regulator is used for power supply, but the output range of the voltage regulator is mostly below 0.8kV. For high voltage levels of 20kV, 35kV, 110kV and above, the existing voltage regulators cannot meet the test requirements and have limitations.

There are also manufacturers who use transformers with the same voltage ratio and the same voltage level as temporary intermediate transformers instead of test transformers, but this method is not suitable for tests where voltage regulators, intermediate transformers, and transformer cabinets for testing have been fixed in one space. The layout of the station, frequent movement and temporary intermediate change will increase the workload and increase the occupied area, and the related equipment needs to be reconnected and debugged, which has a great impact on the efficiency of the test

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