Low-zero-sequence-resistance slow-harmonic energy-saving transformer
An energy-saving transformer and zero-sequence impedance technology, applied in the direction of transformer/inductor coil/winding/connection, etc., can solve the problems of increasing transformer operating loss, output voltage distortion, affecting power grid safety, etc., to reduce operating loss, harmonics Suppression, the effect of low zero-sequence impedance
Active Publication Date: 2013-02-13
中电电气(江苏)变压器制造有限公司
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Problems solved by technology
The current distribution transformers generally use Dyn (delta connection on the primary side, star connection on the secondary side) to suppress the zero-sequence current from flowing into the power grid, but this type of transformer cannot eliminate the influence of other harmonics such as 5 and 7 on the power grid. , there are still many safety, reliability and power quality issues
For example, the zero-sequence current flowing in the primary-side delta winding will cause distortion of the output voltage and increase coil loss; the harmonic load will induce high-frequency harmonic current in the primary-side winding through electromagnetic coupling and flow into the power grid, affecting the safety of the power grid; The eddy current loss caused by high frequency harmonic current will increase the operating loss of the transformer
Method used
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[0022] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.
[0023] Such as figure 1 As shown, the primary side winding of the transformer in this embodiment adopts a delta connection, and the secondary side winding of the transformer adopts a zigzag connection with double output; the secondary side winding includes a first group of windings A1 and a second group of windings A2, the first group of The winding A1 includes the first phase output winding a1, the second phase output winding b1 and the third phase output winding c1, and the second group of winding A2 includes the fourth phase output winding a2, the fifth phase output winding b2 and the sixth phase output winding ...
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The invention discloses a low-zero-sequence-resistance slow-harmonic energy-saving transformer. Primary side windings of the transformer are connected by adopting a triangle, secondary side windings of the transformer are connected by adopting a dual-output curve; each secondary side winding comprises a first group of windings and a second group of windings, wherein the first group of windings comprises a first phase output winding, a second phase output winding and a third phase output winding; and the second group of windings comprises a fourth phase output winding, a fifth phase output winding and a sixth phase output winding. The invention has the advantages of inhibiting distortion of output voltages on the basis of an electromagnetic filtering principle, reducing zero sequence resistance and operation loss of the transformer, ensuring that harmonics are inhibited, eliminating 3 times, 5 times, 7 times, 17 times and 19 times of harmonics, greatly improving influence of secondary side harmonics to a primary side power grid, weakening primary side and secondary side winding coupling fluxes and primary side winding circulation caused by harmonic currents, and reducing operation loss of the transformer.
Description
technical field [0001] The invention relates to a power transformer based on the principle of electromagnetic filtering, in particular to a low zero-sequence impedance slow harmonic energy-saving transformer. Background technique [0002] Due to the development of power electronics technology and their wide application in single-phase loads such as household appliances and other three-phase rectifiers, non-linear loads have increased significantly. The current distribution transformers generally use Dyn (delta connection on the primary side, star connection on the secondary side) to suppress the zero-sequence current from flowing into the power grid, but this type of transformer cannot eliminate the influence of other harmonics such as 5 and 7 on the power grid. , while there are many safety, reliability and power quality issues. For example, the zero-sequence current flowing in the primary-side delta winding will cause distortion of the output voltage and increase coil los...
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IPC IPC(8): H01F27/28H01F27/30
Inventor 郭健金承祥李宁
Owner 中电电气(江苏)变压器制造有限公司