WO2016091123A1 - 一种大容量三相组合式移相变压器 - Google Patents

一种大容量三相组合式移相变压器 Download PDF

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Publication number
WO2016091123A1
WO2016091123A1 PCT/CN2015/096443 CN2015096443W WO2016091123A1 WO 2016091123 A1 WO2016091123 A1 WO 2016091123A1 CN 2015096443 W CN2015096443 W CN 2015096443W WO 2016091123 A1 WO2016091123 A1 WO 2016091123A1
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Prior art keywords
phase
coil
transformer
voltage
series
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PCT/CN2015/096443
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English (en)
French (fr)
Inventor
张志强
张立国
杨同勋
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山东电工电气集团有限公司
山东电力设备有限公司
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Priority to EP15868363.1A priority Critical patent/EP3232452B1/en
Publication of WO2016091123A1 publication Critical patent/WO2016091123A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/12—Two-phase, three-phase or polyphase transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F2029/143—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias

Definitions

  • the invention relates to a phase shifting transformer, in particular to a large-capacity three-phase combined phase shifting transformer.
  • phase shifting transformer makes the power system run more stable and efficient by adjusting the phase difference between the input and output voltages.
  • the basic principle of phase shifting transformer phase shift is to generate a voltage between the power supply side and the load side.
  • the voltage has a phase difference with the power supply side voltage, and the effective value can be adjusted, and the voltage on the power supply side is superimposed as the load side voltage.
  • a phase change occurs between the power supply side and the load side voltage.
  • Currently used phase shifting transformers include two basic structures: single-core and double-hearted.
  • the basic principle of a single-hearted phase shifting transformer is to connect a part of one phase voltage to another, so the structure is relatively simple, but the voltage regulating coil is located at the head end of the line, and the voltage level of the tap changer is relatively high and directly withstands the operation of the power grid. Various overvoltages and overcurrents are not suitable for high voltage and large capacity conditions.
  • the double-hearted structure consists of a series transformer and an excitation transformer. The two parts are mounted on two separate cores and are housed in two separate transformer tanks.
  • Each phase of the excitation transformer consists of a voltage-regulating excitation coil and a voltage-regulating coil.
  • the junction group is Y/Y.
  • the voltage-regulating excitation coil provides excitation for the excitation transformer.
  • the taps of the voltage-regulating coil are connected to the on-load tap-changer.
  • the tap changer has a forward and reverse conversion selector.
  • the double-hearted phase-shifting transformer is more complicated than the single-core type, but its tap changer has a lower voltage level, so it is suitable for large-capacity and high-voltage applications, but the connection between the series transformer and the two fuel tanks of the excitation transformer.
  • the insulation level of the connecting leads in the structure is equivalent to the level of the line insulation, so the connection structure is complicated and the installation of the two fuel tanks is also difficult.
  • the present invention proposes a large-capacity three-phase combined phase shifting transformer, which can achieve the purpose of reducing the voltage level of the tap changer by the double-hearted phase shifting transformer, and at the same time simplify the connection structure between the parts. , to reduce technical difficulty, suitable for higher voltage levels and larger capacity.
  • a large-capacity three-phase combined phase shifting transformer comprising three single-phase transformers, which are respectively combined into three-phase transformers of A, B, and C, each of which is single
  • the phase transformer comprises a series transformer and an excitation transformer, both of which are placed in the same oil tank and are divided into two independent body parts
  • each phase series transformer comprises a series coil and an excitation coil, wherein the first end and the end of the series coil respectively serve as the power supply side
  • the input terminal and the load side output terminal, the first and the end of the excitation coil are led out of the oil tank, and when the three phases are operated together, the first ends of the three-phase series coil are connected in an angular shape, and the first ends of the three-phase excitation coil are connected in an angular shape
  • the excitation transformer includes the adjustment The excitation coil and the voltage regulating coil, the first end of the voltage regulating excitation coil is connected with the center tap of the series coil in the series transformer of the
  • Three-phase combined phase shifting transformer will be A, B, C
  • the three phases are placed in three different fuel tanks to reduce the size and weight of a single transformer for easy transportation and safety. It is suitable for the connection of the first end of the excitation coil and the center tap of the coil of the same phase in the same tank in the case of higher voltage level and larger capacity. It does not need to be connected through a special connection structure, nor is it used.
  • the fuel tank is led out, so the structure here is greatly simplified and the technical difficulty is reduced.
  • the end of each line is led out through the casing, and the three phases can be softly connected by materials such as cables, and the on-site installation operation, test and operation and maintenance are also more convenient.
  • a finite current reactor is installed at the first end and the end of the series coil for reducing the impact of the short-circuit current in the power grid on the phase shifting transformer.
  • a finite current reactor is connected in series in the voltage regulating coil.
  • a plurality of series coils are connected in series, a plurality of exciting coils are connected in parallel, a plurality of voltage regulating exciting coils are connected in parallel, and a plurality of voltage regulating coils are connected in series, because the current in the voltage regulating coil is too large, so
  • a current limiting reactor is connected in each of the voltage-regulating coil branches to balance the current distribution in the branch, and to limit the damage caused by the short-circuit current that may be generated to the on-load tap-changer.
  • the invention has simple structure, can reduce the voltage level of the tap changer, can simplify the connection structure between the respective bodies, and reduce the installation difficulty, and has strong practicability in the phase shifting transformer of large capacity and high voltage level.
  • Embodiment 1 is a schematic diagram of a single-phase wiring of Embodiment 1;
  • Figure 3 is a schematic diagram of phase shifting of the present invention.
  • Figure 4 is a schematic diagram of the single-phase wiring of the second embodiment
  • Figure 5 is a schematic diagram of the single-phase wiring of the third embodiment
  • 1, series transformer, 2, excitation transformer, SVA-SVC are A phase, B phase, C phase series coil
  • SVA1, SVA2 are two coils of A phase series coil
  • EVA-EVC are A phase
  • EVA1 and EVA2 are two coils of the A-phase excitation coil
  • TVA-TVC are A-phase, B-phase, and C-phase voltage-regulating coils
  • TVA1 and TVA2 are two A-phase voltage-regulating coils.
  • Coil, TEVA-TEVC are A phase, B phase, C phase pressure excitation coil
  • TEVA1, TEVA2 For the A phase, the two coils of the excitation coil are regulated, L1-L2, and the reactor.
  • a large-capacity three-phase combined phase shifting transformer comprises three single-phase transformers, which are respectively combined into three-phase transformers as three phases A, B and C, and each single-phase transformer comprises a series transformer 1 and an excitation transformer 2, both of which It is placed in the same tank and divided into two separate body parts.
  • the series transformer 1 includes a series coil SVA and an exciting coil EVA, and leads four terminals: a series coil head end SA and a series coil end LA as power source side input terminals and load side output terminals, respectively.
  • the first end of the excitation coil sa and the excitation coil end la are all led out of the oil tank, and the excitation transformer 2 includes a voltage regulating excitation coil TEVA and a voltage regulating coil TVA, the first end ta of the pressure excitation coil and the series coil SVA of the in-phase series transformer 1
  • the center tap is connected, and the end is a neutral point to lead out the fuel tank.
  • the TA end of the pressure regulating coil is led out of the fuel tank, and the end is used as a neutral point to lead out the fuel tank.
  • the B phase, the C phase and the A phase have the same structure. As shown in Fig.
  • the three-phase voltage-regulating excitation coil TEVA-TEVC is The star connection
  • the three-phase voltage regulating coil TVA-TVC is star-connected.
  • the first end of the three-phase excitation coil EVA-EVC is connected in an angular shape, and the angular connection of each two phases is connected to the first end of the voltage regulating coil of the third phase, and the voltage regulating coil is connected to the circuit through the on-load tap changer.
  • the number of turns to change the voltage magnitude and polarity in the voltage regulating coil, the phase shifting principle is shown in Figure 3.
  • the voltage in the voltage regulating coil provides excitation for the core of the series transformer, so that the excitation coil of the series transformer is connected to the field coil.
  • the voltage in the exciting coil induces a voltage ⁇ U 1 and a voltage ⁇ U 2 which are 90° out of phase with the in-phase voltage-regulating coil in the corresponding series coil, and the voltage ⁇ U 1 and the voltage ⁇ U 2 make the power-side voltage U SA of the phase shifting transformer
  • a phase angle change is generated between the load side voltage U LA and the output voltage is the same as the input voltage, and the phase angle between the power source side and the load side voltage is changed.
  • the phase is adjusted by adjusting the position of the tap changer. The adjustment between the difference size and lead or lag.
  • a large-capacity three-phase combined phase shifting transformer as shown in FIG. 4, a current limiting reactance for mitigating the impact of a short-circuit current on a phase-shifting transformer in a power grid is installed at a front end SA of the series coil and an LA end of the series coil
  • the other structures L1 and L2 are the same as those in the first embodiment.
  • a large-capacity three-phase combined phase shifting transformer as shown in Fig. 5, because the phase shifting transformer has a large capacity, two series coils SVA1 and SVA2 are connected in series, and two exciting coils EVA1 and EVA2 are connected in parallel, and two voltage-regulating excitations are used.
  • the coils TEVA1 and TEVA2 are connected in parallel, and the two voltage regulating coils TVA1 and TVA2 are connected in series. Since the current in the voltage regulating coil is too large, three on-load tap-changers are used, and three branches are connected in series to balance three branches.
  • the current limiting circuit in the circuit distributes and limits the current limiting reactors L1 and L2 that may cause damage to the on-load tap changer.
  • the other structures are the same as those in the first embodiment.

Abstract

本发明涉及一种大容量三相组合式移相变压器，包括三台单相变压器，分别作为A、B、C 三相组合成三相变压器，每台单相变压器包括串联变压器和励磁变压器，两者置于同一油箱中且分为两个独立的器身部分，每相串联变压器包括串联线圈和励磁线圈，励磁变压器包括调压励磁线圈和调压线圈，调压励磁线圈的首端与同相的串联变压器中串联线圈的中心抽头相连，末端为中性点引出油箱，调压线圈的首端引出油箱与其余两项励磁线圈的角形结点相接，末端作为中性点引出油箱。本发明结构简单，既能降低分接开关的电压等级，也能简化各器身之间的连接结构，降低安装难度，在大容量及高电压等级的移相变压器中具有较强的实用性。

Description

一种大容量三相组合式移相变压器 一种大容量三相组合式移相变压器
技术领域
本发明涉及一种移相变压器，具体涉及一种大容量三相组合式移相变压器。
背景技术
移相变压器通过调整输入及输出电压之间的相位差，使电力系统运行更加稳定高效。移相变压器移相的基本原理是在电源侧与负载侧之间产生一个电压，该电压与电源侧电压有一定相角差，且有效值大小可以调整，并与电源侧电压叠加为负载侧电压，使电源侧与负载侧电压之间产生相位变化。目前常用的移相变压器包括单心式及双心式两种基本结构。单心式移相变压器的基本原理是将一相电压的一部分与另一相连接，因此结构比较简单，但其调压线圈位于线路首端，分接开关电压等级较高且直接承受电网运行中的各种过电压及过电流，因此不适用于高电压等级与大容量条件。双心式结构由串联变压器和励磁变压器两部分组成的，这两部分装在两个独立的铁心上，并分别装在两个独立的变压器油箱中。励磁变压器每相由调压励磁线圈以及调压线圈组成，联结组为Y/Y，调压励磁线圈为励磁变压器提供励磁，调压线圈的各分接头接到有载分接开关上，有载分接开关带有正反转换选择器。双心式移相变压器与单心式相比结构复杂，但其分接开关电压等级较低，因此适用于大容量和高电压等级的场合，但串联变压器与励磁变压器的两个油箱间的连接结构中连接引线绝缘水平与线路绝缘水平相当，因此连接结构比较复杂，且两个油箱的安装难度也较高。
发明内容
针对上述问题，本发明提出了一种大容量三相组合式移相变压器，既能达到双心式移相变压器降低分接开关的电压等级的目的，同时又能简化各部分之间的连接结构，降低技术难度，适用于更高电压等级及更大容量的场合。
为解决上述问题，本发明采取的技术方案为：一种大容量三相组合式移相变压器，包括三台单相变压器，分别作为A、B、C三相组合成三相变压器，每台单相变压器包括串联变压器和励磁变压器，两者置于同一油箱中且分为两个独立的器身部分，每相串联变压器包括串联线圈和励磁线圈，其中串联线圈的首端和末端分别作为电源侧输入端子和负载侧输出端子，励磁线圈的首、末端均引出油箱，三相共同运行时，三相串联线圈首末端相接连成角形，三相励磁线圈首末端相接连成角形；励磁变压器包括调压励磁线圈和调压线圈，调压励磁线圈的首端与同相的串联变压器中串联线圈的中心抽头相连，末端为中性点引出油箱，调压线圈的首端引出油箱与其余两相励磁线圈的角形结点相接，末端作为中性点引出油箱，调压线圈 连接有用于 调整调压线圈中电压大小和极性的有载分接开关， 三相共同运行时，三相调压励磁线圈呈星形连接，三相调压线圈呈星形连接。三相组合式移相变压器将A、B、C 三相分别置于三个不同油箱内，可减小单台变压器的尺寸和重量，便于运输和安 装，因此适用于在更高电压等级及更大容量场合下，同时调压励磁线圈的首端与同相串联线圈中心抽头的连接在同一个油箱内，不需要通过特殊的连接结构相连，也不用引出油箱，因此此处的结构大大简化，降低技术难度。各线端通过套管引出，三相之间可用电缆等材料实现软连接，现场安装操作、试验及运行维护也更为简便。
在所述串联线圈的首、末端均安装有限流电抗器，用于减轻电网中短路电流对移相变压器的冲击。
在所述的调压线圈中串联有限流电抗器。移相变压器容量较大时，采用多个串联线圈串联，多个励磁线圈并联，多个调压励磁线圈并联，多个调压线圈串联的结构，由于调压线圈中电流过大，因此采用多台有载分接开关，此时在每条调压线圈支路中串入限流电抗器用于平衡支路中电流分配，并限制可能产生的短路电流对有载分接开关造成的损坏。
本发明结构简单，既能降低分接开关的电压等级，也能简化各器身之间的连接结构，降低安装难度，在大容量及高电压等级的移相变压器中具有较强的实用性。
附图说明
图1为实施例一单相接线原理图；
图2为实施例一接线原理图；
图3为本发明移相原理图；
图4为实施例二单相接线原理图；
图5为实施例三单相接线原理图；
图中，1、串联变压器，2、励磁变压器，SVA-SVC分别为A相、B相、C相串联线圈，SVA1、SVA2为A相串联线圈的两个线圈，EVA-EVC分别为A相、B相、C相励磁线圈，EVA1、EVA2为A相励磁线圈的两个线圈，TVA-TVC分别为A相、B相、C相调压线圈，TVA1、TVA2为A相调压线圈的两个线圈，TEVA-TEVC分别为A相、B相、C相调压励磁线圈，TEVA1、TEVA2 为A相调压励磁线圈的两个线圈，L1-L2、电抗器。
具体实施方式
实施例一
一种大容量三相组合式移相变压器，包括三台单相变压器，分别作为A、B、C三相组合成三相变压器，每台单相变压器包括串联变压器1和励磁变压器2，两者置于同一油箱中且分为两个独立的器身部分。如图1所示，以A相为例，串联变压器1包括串联线圈SVA和励磁线圈EVA，引出四个端子：串联线圈首端SA和串联线圈末端LA分别作为电源侧输入端子和负载侧输出端子，励磁线圈的首端sa、励磁线圈末端la均引出油箱，励磁变压器2包括调压励磁线圈TEVA和调压线圈TVA，调压励磁线圈的首端ta与同相的串联变压器1中串联线圈SVA的中心抽头相连，末端为中性点引出油箱，调压线圈首端TA引出油箱，末端作为中性点引出油箱。B相、C相与A相结构相同。如图2所示，三相共同运行时，三相串联线圈SVA-SVC首末端相接连成角形，三相励磁线圈EVA-EVC首末端相接连成角形；三相调压励磁线圈TEVA-TEVC呈星形连接，三相调压线圈TVA-TVC呈星形连接。三相的励磁线圈EVA-EVC首末 端相接连成角形，每两相连接的角形结点与第三相的调压线圈首端相连，并通过有载分接开关来调整调压线圈串入电路的匝数来改变调压线圈中的电压大小和极性，移相原理如图3所示，调压线圈中的电压为串联变压器的铁心提供励磁，使串联变压器中角接的励磁线圈上产生一个超前或滞后于同相励磁变压器的调压励磁线圈电压90°的电压。励磁线圈中的电压在相应的串联线圈中感应产生与同相调压励磁线圈相位差为90°的电压ΔU1和电压ΔU2，电压ΔU1和电压ΔU2使移相变压器的电源侧电压USA 和负载侧电压ULA 之间产生一个相角的变化，而输出电压大小与输入电压大小相同，实现电源侧与负载侧电压之间相角的变化，通过调节分接开关的位置，实现该相位差大小与超前或滞后之间的调节。
实施例二
一种大容量三相组合式移相变压器，如图4所示，在所述串联线圈首端SA和串联线圈末端LA均安装有用于减轻电网中短路电流对移相变压器的冲击的限流电抗器L1、L2，其他结构同实施例一相同。
实施例三
一种大容量三相组合式移相变压器，如图5所示，由于移相变压器容量较大，采用两个串联线圈SVA1、SVA2串联，两个励磁线圈EVA1、EVA2并联，两个调压励磁线圈TEVA1、TEVA2并联，两个调压线圈TVA1、TVA2串联的结构，由于调压线圈中电流过大，因此采用三台有载分接开关，在三条支路中串入用于平衡三个支路中电流分配并限制可能产生的短路电流对有载分接开关造成的损坏的限流电抗器L1、L2，其他结构同实施例一相同。

Claims (3)

1. 一种大容量三相组合式移相变压器，其特征在于：包括三台单相变压器，分别作为A、B、C三相组合成三相变压器，每台单相变压器包括串联变压器和励磁变压器，两者置于同一油箱中且分为两个独立的器身部分，每相串联变压器包括串联线圈和励磁线圈，其中串联线圈的首端和末端分别作为电源侧输入端子和负载侧输出端子，励磁线圈的首、末端均引出油箱，三相共同运行时，三相串联线圈首末端相 接连成角形，三相励磁线圈首末端相接连成角形；励磁变压器包括调压励磁线圈和调压线圈，调压励磁线圈的首端与同相的串联变压器中串联线圈的中心抽头相连，末端为中性点引出油箱，调压线圈的首端引出油箱与其余两相励磁线圈的角形结点相接，末端作为中性点引出油箱，调压线圈 连接有用于调整调压线圈中电压大小和极性的有载分接开关， 三相共同运行时，三相调压励磁线圈呈星形连接，三相调压线圈呈星形连接。
2. 根据权利要求1所述的大容量三相组合式移相变压器，其特征在于：在所述串联线圈的首、末端均安装有限流电抗器。
3. 根据权利要求1或2所述的大容量三相组合式移相变压器，其特征在于：在所述的调压线圈中串联有限流电抗器。
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