CN102226972B - Two-column serial wiring structure of network-side coils for converter transformer - Google Patents
Two-column serial wiring structure of network-side coils for converter transformer Download PDFInfo
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Abstract
本发明提供了一种换流变用网侧线圈两柱串联的接线结构，包括设置在变压器油箱中的两柱铁心，每柱铁心外侧设置有一个调压线圈、一个网侧线圈、一个阀侧线圈，所述两个网侧线圈串联后，一端接至电网，另一端经两个并联的调压线圈接至网侧中性点；所述两个阀侧线圈并联后接至阀侧端子，所述电网与网侧线圈之间连接有出线装置。本发明网侧只用1套750kV出线装置，另一柱网侧线圈电压降为原额定电压的一半，简化了换流变的结构，由于网侧出线装置绝缘结构的复杂程度取决于出线的电压水平，因此，本发明可以节省一柱网侧高压出线装置，不但降低成本，而且使得整体接线结构非常简单。随着网侧电压的提高，本发明的优点更为突出。
The invention provides a wiring structure in which two columns of grid-side coils are connected in series for converters, including two-column iron cores arranged in the transformer oil tank, and a voltage regulating coil, a grid-side coil, and a valve-side coil are arranged on the outside of each column iron core. Coil, after the two grid-side coils are connected in series, one end is connected to the grid, and the other end is connected to the neutral point of the grid side through two parallel voltage regulating coils; the two valve-side coils are connected in parallel to the valve-side terminal, An outlet device is connected between the grid and the grid-side coil. In the present invention, only one set of 750kV outlet device is used on the grid side, and the voltage drop of the coil on the other column grid side is half of the original rated voltage, which simplifies the structure of the converter transformer, because the complexity of the insulation structure of the grid side outlet device depends on the voltage of the outlet Therefore, the present invention can save a high-voltage outlet device on the grid side, which not only reduces the cost, but also makes the overall wiring structure very simple. With the increase of grid side voltage, the advantages of the present invention are more prominent.
Description
技术领域 technical field
本发明属于换流变压器技术领域，特别是对网侧电压为超、特高压的换流变用网侧线圈两柱串联的接线结构。The invention belongs to the technical field of converter transformers, in particular to a connection structure with two columns of grid-side coils connected in series for converters whose grid-side voltage is ultra-high voltage or ultra-high voltage.
背景技术 Background technique
随着我国电力行业的不断发展，大容量跨区域远距离直流输电线路的增加，对直流输电线路的输电容量和输电距离提出了更高的要求。国内现有的换流变压器网侧电压最高为500kV，阀侧电压最高为±800kV，但是随着输电容量和输电距离的增加，现有电压下的输电经济性将会大幅降低，需要提高网侧和阀侧的电压等级以提高直流输电的经济性，如网侧电压为750kV，阀侧电压为±1100kV。With the continuous development of my country's power industry, the increase of large-capacity cross-regional long-distance DC transmission lines has put forward higher requirements for the transmission capacity and transmission distance of DC transmission lines. The grid-side voltage of existing domestic converter transformers is up to 500kV, and the valve-side voltage is up to ±800kV. However, with the increase of transmission capacity and transmission distance, the economic efficiency of power transmission under the existing voltage will be greatly reduced, and it is necessary to improve the grid-side voltage. And the voltage level of the valve side to improve the economy of DC transmission, such as the voltage of the grid side is 750kV, and the voltage of the valve side is ±1100kV.
请参阅图1所示，原有的换流变压器网侧线圈(500kV级)采用两柱并联的接线方式，网侧首端出线处绝缘结构复杂；当提高网侧线圈的电压等级(750kV级)后，如果网侧继续采用两柱并联的接线方式(见图2)，则网侧首端出线处绝缘结构就更加复杂，同时，制作两套网侧出线装置的成本也非常高。Please refer to Figure 1. The original grid-side coil of the converter transformer (500kV level) adopts two-column parallel connection, and the insulation structure at the head end of the grid side is complicated; when the voltage level of the grid-side coil (750kV level) is increased Finally, if the network side continues to use the two-column parallel connection method (see Figure 2), the insulation structure at the head outlet of the network side will be more complicated. At the same time, the cost of making two sets of network side outlet devices is also very high.
鉴于以上问题，实有必要提供一种换流变用网侧线圈两柱串联的接线结构以降低换流变的制造成本和简化换流变的结构。In view of the above problems, it is necessary to provide a connection structure in which two columns of the grid-side coil for the converter are connected in series to reduce the manufacturing cost of the converter and simplify the structure of the converter.
发明内容 Contents of the invention
本发明提供了一种换流变用网侧线圈两柱串联的接线结构，其线圈两柱采用串联的方式，只需要做出一套网侧出线结构，降低了制作成本，简化了结构。The invention provides a wiring structure in which two columns of a grid-side coil are connected in series for a converter. The two coil columns are connected in series, and only one set of grid-side outlet structure needs to be made, which reduces the manufacturing cost and simplifies the structure.
本发明所采用的技术方案是：一种换流变用网侧线圈两柱串联的接线结构，包括设置在变压器油箱中的两柱铁心，每柱铁心外侧设置有一个调压线圈、一个网侧线圈、一个阀侧线圈，所述两个网侧线圈串联后，一端接至电网，另一端经两个并联的调压线圈接至网侧中性点；所述两个阀侧线圈并联后接至阀侧端子，所述电网与网侧线圈高压出头之间连接有出线装置。The technical solution adopted in the present invention is: a wiring structure in which two columns of grid-side coils are connected in series for converter, including two-column iron cores arranged in the transformer oil tank, and a voltage-regulating coil and a grid-side coil are arranged on the outside of each column iron core. Coil, a valve side coil, after the two network side coils are connected in series, one end is connected to the power grid, and the other end is connected to the neutral point of the network side through two parallel voltage regulating coils; the two valve side coils are connected in parallel and then connected To the valve side terminal, an outlet device is connected between the power grid and the high voltage outlet of the grid side coil.
本发明换流变用网侧线圈两柱串联的接线结构至少具有以下优点：本发明每柱铁心外侧的网侧线圈采用串联方式，这样，电网只需要与一个网侧线圈连接，也就只需要一个出线装置，这样，节省了一个出线装置，降低了成本；另外，由于网侧出线装置绝缘结构的复杂程度取决于出线的电压水平，因此，本发明可以节省一柱网侧高压出线装置，不但降低成本，而且使得整体接线结构非常简单。随着网侧电压的提高，本发明的优点更为突出。The connection structure of the two grid-side coils connected in series for the converter transformer of the present invention has at least the following advantages: the grid-side coils on the outside of each column of the core in the present invention are connected in series, so that the power grid only needs to be connected to one grid-side coil, and only In this way, one outlet device is saved and the cost is reduced; in addition, since the complexity of the insulation structure of the outlet device on the grid side depends on the voltage level of the outlet, the present invention can save a high-voltage outlet device on the grid side, not only The cost is reduced, and the overall wiring structure is very simple. With the increase of grid side voltage, the advantages of the present invention are more prominent.
附图说明 Description of drawings
图1是原有的换流变压器网侧线圈(500kV级)所采用的接线结构图；Figure 1 is the wiring structure diagram used in the original converter transformer network side coil (500kV class);
图2是原有的换流变压器网侧线圈(750kV级)所采用的接线结构图；Figure 2 is the wiring structure diagram used in the original converter transformer network side coil (750kV class);
图3是本发明换流变用网侧线圈两柱串联的接线结构。Fig. 3 is the connection structure of two columns of the grid-side coil for the converter transformer in series in the present invention.
具体实施方式 Detailed ways
请参阅图3所示，本发明换流变用网侧线圈两柱串联的接线结构包括设置在变压器油箱中的两柱铁心，每柱铁心外侧设置有一个调压线圈、一个网侧线圈、一个阀侧线圈，所述两个网侧线圈串联后，一端接至电网，另一端经两个并联的调压线圈接至网侧中性点；所述两个阀侧线圈并联后接至阀侧端子，所述电网与网侧线圈高压出头之间连接有出线装置。Please refer to Fig. 3, the wiring structure of the present invention in which two columns of grid-side coils are connected in series for converter transformation includes two-column iron cores arranged in the transformer oil tank, and a voltage-regulating coil, a grid-side coil, and a Valve side coil, after the two network side coils are connected in series, one end is connected to the power grid, and the other end is connected to the neutral point of the network side through two parallel pressure regulating coils; the two valve side coils are connected in parallel and then connected to the valve side terminal, and an outlet device is connected between the power grid and the high-voltage outlet of the grid-side coil.
所述调压线圈和网侧线圈形成网侧接线电路，所述一对阀侧线圈形成阀侧接线电路。The voltage regulation coil and the grid side coil form a grid side wiring circuit, and the pair of valve side coils form a valve side wiring circuit.
所述网侧接线电路的高压端子A的输出通过出线装置依次连接有相互串联的第一网侧线圈和第二网侧线圈，所述第二网侧线圈的输出端连接有以并联方式连接的第一调压线圈和第二调压线圈，所述第一调压线圈和第二调压线圈的输出端连接在网侧接线电路的中性点端子X上。The output of the high-voltage terminal A of the grid-side wiring circuit is sequentially connected to the first grid-side coil and the second grid-side coil connected in series through the outlet device, and the output end of the second grid-side coil is connected to a parallel connection. The first voltage regulating coil and the second voltage regulating coil, the output ends of the first voltage regulating coil and the second voltage regulating coil are connected to the neutral point terminal X of the grid side connection circuit.
所述阀侧接线电路包括相互并联的第一和第二阀侧线圈，阀侧电路的两个阀侧端子分别连接在并联的第一和第二阀侧线圈的两端。The valve-side wiring circuit includes first and second valve-side coils connected in parallel, and the two valve-side terminals of the valve-side circuit are respectively connected to both ends of the parallel-connected first and second valve-side coils.
本发明网侧只用1套750kV出线装置，另一柱网侧线圈电压降为原额定电压的一半，简化了换流变器身端部及出线部位的绝缘结构。In the present invention, only one set of 750kV outgoing line device is used on the grid side, and the coil voltage on the other column grid side is reduced to half of the original rated voltage, which simplifies the insulation structure of the end of the converter body and the outgoing line.
在本发明中，所述网侧接线电路的高压端子A的输出端仅与第一网侧线圈相连，与传统的网侧接线电路相比，本发明接线电路节省了一个出线装置。In the present invention, the output end of the high-voltage terminal A of the grid-side wiring circuit is only connected to the first grid-side coil. Compared with the traditional grid-side wiring circuit, the wiring circuit of the present invention saves one outlet device.
另外，由于网侧出线装置绝缘结构的复杂程度取决于出线的电压水平，因此，本发明可以节省一柱网侧高压出线装置，不但降低成本，而且使得整体接线结构非常简单。随着网侧电压的提高，本发明的优点更为突出。In addition, since the complexity of the insulation structure of the grid-side outlet device depends on the voltage level of the outlet, the present invention can save a column of grid-side high-voltage outlet devices, which not only reduces costs, but also makes the overall wiring structure very simple. With the increase of grid side voltage, the advantages of the present invention are more prominent.
以上所述仅为本发明的一种实施方式，不是全部或唯一的实施方式，本领域普通技术人员通过阅读本发明说明书而对本发明技术方案采取的任何等效的变换，均为本发明的权利要求所涵盖。The above is only one embodiment of the present invention, not all or the only embodiment. Any equivalent transformation of the technical solution of the present invention adopted by those of ordinary skill in the art by reading the description of the present invention is the right of the present invention. covered by the requirements.
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| CN114743771A (en) * | 2022-04-22 | 2022-07-12 | 广东电网有限责任公司广州供电局 | Flexible direct current converter transformer |
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| CN2914278Y (en) * | 2006-06-27 | 2007-06-20 | 西安西电变压器有限责任公司 | Single-phase auto-powerstat |
| CN101145440A (en) * | 2006-09-14 | 2008-03-19 | 特变电工股份有限公司 | V-shaped wiring transformer |
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| CN2914278Y (en) * | 2006-06-27 | 2007-06-20 | 西安西电变压器有限责任公司 | Single-phase auto-powerstat |
| CN101145440A (en) * | 2006-09-14 | 2008-03-19 | 特变电工股份有限公司 | V-shaped wiring transformer |
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Application publication date: 20111026 Assignee: Xi'an XD Transformer Co., Ltd. Assignor: China XD Electronic Corporation Contract record no.: 2013610000064 Denomination of invention: Two-column serial wiring structure of network-side coils for converter transformer Granted publication date: 20120822 License type: Exclusive License Record date: 20130624 |
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