CN214315077U - Improved equivalent 12-pulse rectifier transformer - Google Patents
Improved equivalent 12-pulse rectifier transformer Download PDFInfo
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- CN214315077U CN214315077U CN202120418641.4U CN202120418641U CN214315077U CN 214315077 U CN214315077 U CN 214315077U CN 202120418641 U CN202120418641 U CN 202120418641U CN 214315077 U CN214315077 U CN 214315077U
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Abstract
The utility model relates to an improved equivalent 12-pulse rectifier transformer, which comprises two rectifier transformers, two groups of rectifier bridges and two direct current reactors; the two groups of rectifier bridges are respectively an A1 group of rectifier bridges and an A2 group of rectifier bridges, and each group of rectifier bridges comprises six rectifier tubes; the two rectifier transformers are respectively a B1 rectifier transformer and a B2 rectifier transformer; one end of each of the two rectifier transformers is connected with external three-phase power, and the other end of each of the two rectifier transformers is connected with two groups of rectifier bridges; the high-voltage windings of the two rectifier transformers are wound by adopting an angle connection method, and the number of turns of the first high-voltage winding is less than that of the second high-voltage winding; a first low-voltage winding of the B1 rectifier transformer is wound in an angle connection mode, a second low-voltage winding of the B2 rectifier transformer is wound in a star connection mode, and the number of turns of the first low-voltage winding is larger than that of the second low-voltage winding; the utility model discloses output voltage waveform is balanced, unanimous, can 24 hours long-term stable work, and the fault rate is extremely low.
Description
Technical Field
The utility model relates to an alternating current-direct current conversion equipment field, especially an improved generation equivalence 12 ripples rectifier transformer.
Background
In the technical field of current transformation, three-phase alternating current needs to be converted into direct current, such as the non-ferrous metal electrolysis industry, the electroplating industry, the direct current electric furnace smelting industry, the frequency conversion industry, the direct current motor driving power supply and the like, for a common direct current power supply, 6-pulse rectification is generally adopted, although the circuit structure is simple, the pulse coefficient is large, the pulse coefficient is 0.057, 3, 5 and 7 times of higher harmonics inevitably exist, and the rectified direct current voltage and direct current instantaneous value have large fluctuation.
In order to overcome the disadvantages of 6-pulse rectification, 12-pulse rectifier transformers are widely used in industry.
The conventional 12-pulse rectifier transformer is characterized in that 1 group of high-voltage windings and 2 groups of low-voltage windings are wound on the same iron core, the 2 groups of low-voltage windings are divided into angle windings and star windings, the secondary side voltage is very low, the number of turns of the secondary side winding is very small, the voltage born by each turn of the secondary side winding is few volts and more dozens of volts, in the actual winding process, half turns of the secondary side winding for enabling the outlet voltages of the 2 groups of low-voltage windings to be equal and only integer turns can be wound, so that the secondary output voltages of the 2 groups of low-voltage windings are different from several volts or even dozens of volts, the output direct-current voltages of the 2 groups of rectifier bridges are different from several volts or even dozens of volts, a large-output-group of small-output-voltage, and a magnetic circuit is interfered with each other because the 2 groups of low-voltage windings share one group of iron core, the phenomenon that the 2 groups of output-voltage is one high or one-low-output-element is always burnt out ingeniously, the transformer is hot and burning.
In a structure using a thyristor as a rectifying element, a common method is to artificially suppress a higher dc output voltage of a set of rectifying bridges with a higher input voltage by increasing a phase shift angle of the set of rectifying bridges with the higher input voltage, so as to obtain a dc output voltage of two sets of rectifying bridges with equal magnitude.
Aiming at the phenomenon, an equivalent 12-pulse rectifier transformer is designed, the defects of the phenomenon are fundamentally solved, the fault that rectifier elements in the same group are burnt out frequently is solved, the natural power factor can reach 0.95, and the difference of 2 groups of output voltages can be controlled to 0.004%.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an improved generation equivalence 12 ripples rectifier transformer can realize output voltage waveform's equilibrium, stability.
In order to achieve the purpose of the utility model, the utility model provides an improved equivalent 12-pulse rectifier transformer, which comprises two rectifier transformers, two groups of rectifier bridges and two direct current reactors; the two groups of rectifier bridges are respectively an A1 group of rectifier bridges and an A2 group of rectifier bridges, and each group of rectifier bridges comprises six rectifier tubes; the two rectifier transformers are respectively a B1 rectifier transformer and a B2 rectifier transformer; the two direct current reactors are respectively a No. 1 direct current reactor and a No. 2 direct current reactor; one end of the B1 rectifier transformer and one end of the B2 rectifier transformer are respectively connected with external three-phase power, and the other ends of the B1 rectifier transformer and the B2 rectifier transformer are respectively connected with the A1 group of rectifier bridges and the A2 group of rectifier bridges; the positive electrode outputs of the A1 rectifier bridge and the A2 rectifier bridge are respectively connected with a positive electrode output end serving as direct current after passing through a No. 1 direct current reactor and a No. 2 direct current reactor, and the negative electrode outputs of the A1 rectifier bridge and the A2 rectifier bridge are directly connected in parallel and then serve as a negative electrode output end of the direct current; each group of rectifier bridges form an independent 6-pulse rectifier circuit, the A1 groups of rectifier bridges are connected with a B1 rectifier transformer, and the A2 groups of rectifier bridges are connected with a B2 rectifier transformer; the B1 rectifier transformer and the B2 rectifier transformer both comprise a high-voltage winding and a low-voltage winding, a first high-voltage winding of the B1 rectifier transformer and a second high-voltage winding of the B2 rectifier transformer are wound in an angle connection mode, and the number of turns of the first high-voltage winding is smaller than that of the second high-voltage winding; a first low-voltage winding of the B1 rectifier transformer is wound in an angle connection mode, a second low-voltage winding of the B2 rectifier transformer is wound in a star connection mode, and the number of turns of the first low-voltage winding is larger than that of the second low-voltage winding; the number of turns of the first low voltage winding is less than the number of turns of the first high voltage winding.
Further, the B1 rectifier transformer and the B2 rectifier transformer are respectively provided with independent iron cores.
Further, the B1 rectifier transformers are in a delta/delta-6 connection group or a delta/delta-4 connection group.
Further, the B2 rectifier transformers are in a delta/Y-5 connection group or a delta/Y-7 connection group.
Furthermore, 2 rectifier transformers all adopt 50KVA capacity, the primary incoming line voltage of the rectifier transformers is 10KV, and the secondary voltage of the rectifier transformers is 30V-200V.
Furthermore, ZP type high-power rectifier tubes or KP type silicon controlled rectifiers are adopted as rectifier elements in the two groups of rectifier bridges.
The utility model discloses improved generation equivalence 12 pulse rectifier transformer compares with prior art and has following advantage: the output voltage is more stable than the voltage waveform of the common 12 pulse waves, and the content of 3-order, 5-order, 7-order and other higher harmonics in the voltage waveform is very low and can not be seen almost by using an oscilloscope for observation; the output voltage waveforms are balanced and consistent, and the difference of the 2 groups of output voltages can be controlled to be 0.004%.
Drawings
FIG. 1 is a schematic diagram of an improved equivalent 12-pulse rectifier transformer of the present invention;
FIG. 2 is a wiring diagram of a Δ/Δ -6 transformer;
FIG. 3 is a diagram of the connection group of the Δ/Δ -6 transformer;
FIG. 4 is a wiring diagram of a Δ/Δ -4 transformer;
FIG. 5 is a diagram of the connection group of the Δ/Δ -4 transformer;
FIG. 6 is a wiring diagram of a Δ/Y-5 transformer;
FIG. 7 is a diagram of the connection group of the Δ/Y-5 transformer;
FIG. 8 is a wiring diagram of a Δ/Y-7 transformer;
FIG. 9 is a diagram of the connection group of the Δ/Y-7 transformer;
FIG. 10 is a schematic diagram of the wiring of a conventional 12-pulse transformer;
FIG. 11 is a schematic diagram of the wiring of an equivalent 12-pulse transformer;
fig. 12 is a schematic structural diagram of a B1 rectifier transformer;
fig. 13 is a schematic structural diagram of a B2 rectifier transformer;
FIG. 14 is a graph comparing waveforms of 6-pulse, normal 12-pulse and equivalent 12-pulse rectifier transformers.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 14, the improved equivalent 12-pulse rectifier transformer of the present invention comprises two rectifier transformers, two sets of rectifier bridges, and two dc reactors; the two groups of rectifier bridges are respectively an A1 group of rectifier bridges and an A2 group of rectifier bridges, and each group of rectifier bridges comprises six rectifier tubes; the two rectifier transformers are respectively a B1 rectifier transformer and a B2 rectifier transformer; the two direct current reactors are respectively a No. 1 direct current reactor and a No. 2 direct current reactor; one ends of the B1 rectifier transformer and the B2 rectifier transformer are respectively connected with external three-phase power, and the other ends of the B1 rectifier transformer and the B2 rectifier transformer are respectively connected with the A1 group of rectifier bridges and the A2 group of rectifier bridges; the positive electrode outputs of the A1 rectifier bridge group and the A2 rectifier bridge group are respectively connected with a positive electrode output end serving as direct current after passing through a No. 1 direct current reactor and a No. 2 direct current reactor, and the negative electrode outputs of the A1 rectifier bridge group and the A2 rectifier bridge group are directly connected in parallel and then serve as a negative electrode output end of the direct current; each group of rectifier bridges form an independent 6-pulse rectifier circuit, A1 groups of rectifier bridges are connected with a B1 rectifier transformer, A2 groups of rectifier bridges are connected with a B2 rectifier transformer, the B1 rectifier transformer and the B2 rectifier transformer are respectively provided with independent iron cores, a first high-voltage winding 1 of the B1 rectifier transformer and a second high-voltage winding 2 of the B2 rectifier transformer are wound by adopting an angle connection method, the number of turns of the first high-voltage winding 1 is close to that of the second high-voltage winding 2, but the number of turns of the second high-voltage winding 2 is different, and usually, the number of turns of the first high-voltage winding 1 is smaller than that of the second high-voltage winding 2; a first low-voltage winding 3 of the B1 rectifier transformer is wound in an angle connection mode to form a delta/delta-6 connection group, a second low-voltage winding 4 of the B2 rectifier transformer is wound in a star connection mode to form a delta/Y-5 connection group, and the number of turns of the first low-voltage winding 3 is larger than that of the second low-voltage winding 4; the number of turns of the first low-voltage winding 3 is less than that of the first high-voltage winding 1; thus, under the condition that the high-voltage windings are connected with the same power supply, the voltages generated by the low-voltage windings are basically the same in magnitude and have a phase difference of 30 degrees, and equivalent 12 pulses are formed.
The B1 rectifier transformer can also adopt the delta/delta-4 connection group and wiring structure shown in fig. 4 and 5, and the B2 rectifier transformer can also adopt the delta/Y-5 connection group and wiring structure shown in fig. 8 and 9.
The method comprises the following specific steps: firstly, a B1 rectifier transformer and a B2 rectifier transformer are made into 2 rectifier transformers with independent iron cores respectively, the rectifier transformers are separated from a magnetic circuit, so that 2 groups of low-voltage windings do not interfere with each other when working, secondly, because the number of turns of the low-voltage winding is few, the voltage born by each turn of the low-voltage winding is very high, the balance of output voltage cannot be adjusted by adjusting the number of turns of the low-voltage winding, however, the number of turns of the high-voltage winding is large, the voltage born by each turn is very low, if the number of turns of the high-voltage winding is different by one turn, the output difference on the low-voltage winding is very small, therefore, the number of turns of the low-voltage winding of the 2 transformers can be made into integer turns capable of outputting the same voltage value, the number of turns of the 2 groups of high-voltage windings is slightly different, and almost equal secondary voltage is obtained on the low-voltage winding of the 2 transformers.
Principle: the winding turns of the transformer coil can only be an integer and cannot be a fraction.
Assuming that a set of equivalent 12-pulse transformers with input voltage of 10KV and output voltage of 50V is manufactured, the design steps are as follows:
firstly, drawing a wiring schematic diagram of a transformer;
secondly, assuming that the structure of the B1 rectifier transformer is a delta/delta-6 connection group, the first high-voltage winding of the B1 rectifier transformer is 1 ten thousand turns, and the first low-voltage winding of the B1 rectifier transformer is 50 turns; the structure of the B2 rectifier transformer is a delta/Y-5 connection group, and the second high-voltage winding thereof is 1 ten thousand turns, so the theoretical value of the second low-voltage winding of the B2 rectifier transformer is 50 ÷ 1.732 ÷ 28.868 turns (the phase voltage in star connection is line voltage/√ 3, and the value of v 3 is 1.732);
thirdly, adjusting design parameters: since the transformation ratio of the B1 rectifier transformer is 10000 ÷ 50 ÷ 200, and the second low-voltage winding of the B2 rectifier transformer is set to 29 turns by rounding, the number of turns of the second high-voltage winding of the B2 rectifier transformer is 29 × 1.732 × 200 ═ 10045.6 turns, and the number of turns of the second high-voltage winding of the B2 rectifier transformer is 10046 turns;
fourthly, verifying the result: when 10KV is applied to the second high-voltage winding of the B2 rectifier transformer, the voltage output by the second low-voltage winding of the B2 rectifier transformer is 49.998V, and the voltage difference value from the 50V voltage output by the first low-voltage winding of the B1 rectifier transformer is 50V-49.998V-0.002V, and the proportional relation between the difference value and the 50V reference value is 0.002V/50V-0.004%, which can be almost ignored;
and (4) conclusion: it is feasible to make the two independent iron core rectifier transformers into equivalent 12-pulse rectifier transformers, and the error of the secondary output voltage of the two sets of rectifier transformers can be controlled to 0.004%.
The utility model discloses a circuit can adopt two rectifier transformer 50 KVA's capacity when using, rectifier transformer inlet wire voltage 10KV once, and secondary voltage is 30V ~ 200V.
In the description of the present specification, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of describing the technical solutions of the present patent and for simplification of the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be interpreted as limiting the present patent application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this patent application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this specification, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present specification can be understood by those of ordinary skill in the art as appropriate.
In this specification, unless explicitly stated or limited otherwise, a first feature may be "on" or "under" a second feature such that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (6)
1. The improved equivalent 12-pulse rectifier transformer is characterized by comprising two rectifier transformers, two groups of rectifier bridges and two direct-current reactors; the two groups of rectifier bridges are respectively an A1 group of rectifier bridges and an A2 group of rectifier bridges, and each group of rectifier bridges comprises six rectifier tubes; the two rectifier transformers are respectively a B1 rectifier transformer and a B2 rectifier transformer; the two direct current reactors are respectively a No. 1 direct current reactor and a No. 2 direct current reactor; one end of the B1 rectifier transformer and one end of the B2 rectifier transformer are respectively connected with external three-phase power, and the other ends of the B1 rectifier transformer and the B2 rectifier transformer are respectively connected with the A1 group of rectifier bridges and the A2 group of rectifier bridges; the positive electrode outputs of the A1 rectifier bridge and the A2 rectifier bridge are respectively connected with a positive electrode output end serving as direct current after passing through a No. 1 direct current reactor and a No. 2 direct current reactor, and the negative electrode outputs of the A1 rectifier bridge and the A2 rectifier bridge are directly connected in parallel and then serve as a negative electrode output end of the direct current; each group of rectifier bridges form an independent 6-pulse rectifier circuit, the A1 groups of rectifier bridges are connected with a B1 rectifier transformer, and the A2 groups of rectifier bridges are connected with a B2 rectifier transformer; the B1 rectifier transformer and the B2 rectifier transformer both comprise a high-voltage winding and a low-voltage winding, a first high-voltage winding of the B1 rectifier transformer and a second high-voltage winding of the B2 rectifier transformer are wound in an angle connection mode, and the number of turns of the first high-voltage winding is smaller than that of the second high-voltage winding; a first low-voltage winding of the B1 rectifier transformer is wound in an angle connection mode, a second low-voltage winding of the B2 rectifier transformer is wound in a star connection mode, and the number of turns of the first low-voltage winding is larger than that of the second low-voltage winding; the number of turns of the first low voltage winding is less than the number of turns of the first high voltage winding.
2. The improved equivalent 12-pulse rectifier transformer as claimed in claim 1, wherein said B1 rectifier transformer and B2 rectifier transformer each have independent cores.
3. The improved equivalent 12-pulse rectifier transformer as claimed in claim 1, wherein said B1 rectifier transformer is a delta/delta-6 connection group or a delta/delta-4 connection group.
4. The improved equivalent 12-pulse rectifier transformer as claimed in claim 1, wherein said B2 rectifier transformer is a delta/Y-5 connection group or a delta/Y-7 connection group.
5. The improved equivalent 12-pulse rectifier transformer as claimed in claim 1, wherein 2 rectifier transformers each have a capacity of 50KVA, the primary incoming line voltage of the rectifier transformer is 10KV, and the secondary voltage is 30V-200V.
6. The improved equivalent 12-pulse rectifier transformer as claimed in claim 1, wherein the rectifier elements in two groups of said rectifier bridges are ZP type high power rectifier tubes or KP type thyristors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120418641.4U CN214315077U (en) | 2021-02-10 | 2021-02-10 | Improved equivalent 12-pulse rectifier transformer |
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| CN202120418641.4U CN214315077U (en) | 2021-02-10 | 2021-02-10 | Improved equivalent 12-pulse rectifier transformer |
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| CN202120418641.4U Active CN214315077U (en) | 2021-02-10 | 2021-02-10 | Improved equivalent 12-pulse rectifier transformer |
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Effective date of registration: 20220905 Address after: 455000 northwest corner of the intersection of Huaxiang Road and Angang Avenue, Yindu District, Anyang City, Henan Province Patentee after: Anyang younengde Electric Co.,Ltd. Address before: 455000 northwest corner of the intersection of Huaxiang Road and Angang Avenue, Yindu District, Anyang City, Henan Province Patentee before: Song Xiqing Patentee before: Song Baoqing |
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