A Three-phase Intermediate Transformer for Experiments Combining Series-Parallel Connection and Star-Delta Transformation
A transformer and star-delta technology, applied in the field of three-phase intermediate transformers and three-phase intermediate transformers for testing, can solve the problems of small voltage regulation range of intermediate transformers and cannot meet test requirements, etc., and achieve a large voltage regulation range and meet electrical test needs. Effect
Active Publication Date: 2018-02-02
ZHEJIANG JIANGBIAN TECH
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Problems solved by technology
The voltage regulation range of the intermediate transformer is small, sometimes it cannot meet the test requirements
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[0036] The technical parameters of the transformer in this embodiment are:
[0037] Rated capacity 1250kV.A;
[0038] Input rated voltage 400, 800V;
[0039] Output rated voltage 600, 1039, 1200, 2078V;
[0040] Rated frequency 50Hz;
[0041] Number of phases Three phases;
[0042] Connection mode Input side D connection, output side D connection or Y connection;
[0043] Cooling method ONAN;
[0044] Voltage regulation mode No-load electric voltage regulation;
[0045] like Figure 1-Figure 14 As shown, a three-phase intermediate transformer for testing combined series-parallel connection and star-delta conversion, including a transformer oil tank 13, an internal voltage regulating switch 11 and an external voltage regulating switch 12, a transformer body 10 is arranged in the oil tank, and the transformer body Place in the transformer oil tank that is full of transformer oil 14. Transformer body comprises iron core 4, inner coil 1 and outer coil 2, and iron core comp...
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The invention relates to a test three-phase intermediate transformer with combination of series-parallel connection and star-triangle conversion. A voltage regulation switch comprises an internal voltage regulation switch (11) and an external voltage regulation switch (12), a first internal winding (1-1) and a second internal winding (1-2) which are same in turns and structures are separately arranged on and under each internal coil, a first external winding (2-1) and a second external winding (2-2) which are same in turns and structures are separately arranged on and under each external coil, conversion of the first internal winding (1-1) and the second internal winding (1-2) of the internal coil of each phase in two modes of series connection and parallel connection can be fulfilled by the internal voltage regulation switch (11), conversion of the first external winding (2-1) and the second external winding (2-2) of the three-phase external coil in four modes of series connection, parallel connection, star connection and triangle connection can be fulfilled by the external voltage regulation switch (12), different combinations are converted by the internal voltage regulation switch (11) and the external voltage regulation switch (12), different voltages and currents are input and output, and the output capacity of the test three-phase intermediate transformer is maintained unchanged. Since the voltage regulation range is wide, the electrical test demands under different test conditions can be met.
Description
technical field [0001] The invention belongs to the technical field of transformers, and relates to a three-phase intermediate transformer, in particular to a test three-phase intermediate transformer combining series-parallel connection and star-delta conversion. Background technique [0002] The voltage and current of the three-phase test power supply required for electrical tests of various power transmission and transformation equipment, including transformers, reactors, transformers, etc., are different, and some of them have a relatively large range of variation, which cannot be satisfied only by generator sets or voltage regulators. Test requirements. The voltage regulation range of the current test intermediate transformer is small, usually only ±5%. The voltage regulation range of the intermediate transformer is small, and sometimes it cannot meet the test requirements. Contents of the invention [0003] The purpose of the present invention is to overcome the de...
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IPC IPC(8): H01F29/02H01F27/28H01F27/40H01H9/00
CPCH01F27/2828H01F27/40H01F29/02H01H9/0016
Inventor 姜振军
Owner ZHEJIANG JIANGBIAN TECH