WO2012019514A1 - High voltage direct current converter transformer and method for on-load tap change switch connection thereof - Google Patents
High voltage direct current converter transformer and method for on-load tap change switch connection thereof Download PDFInfo
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- WO2012019514A1 WO2012019514A1 PCT/CN2011/077912 CN2011077912W WO2012019514A1 WO 2012019514 A1 WO2012019514 A1 WO 2012019514A1 CN 2011077912 W CN2011077912 W CN 2011077912W WO 2012019514 A1 WO2012019514 A1 WO 2012019514A1
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- 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
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
Definitions
- the high-voltage direct current transmission is a transmission method in which three-phase alternating current is rectified into a direct current through a converter station, and then sent to another converter station through a direct current transmission line to be converted into a three-phase alternating current. It consists essentially of two converter stations and a DC transmission line, which are connected to the AC system at both ends.
- the main equipment of the converter station includes inverters, converter transformers, smoothing reactors, AC filters, DC arresters and control protection equipment.
- the converter transformer provides a 12-pulse AC voltage with a phase difference of 30° to reduce the AC side harmonic current, especially the 5th and 7th harmonic currents; as an electrical isolation between the AC system and the DC system, weakening the intrusion DC system
- the AC side overvoltage; the short circuit current of the DC system is limited to enter the AC system through the impedance of the converter transformer; the DC voltage can be adjusted by a converter transformer.
- the converter After the converter is energized, adjust the gear of the on-load tap changer to the appropriate position according to the valve side voltage, and then unlock the valve block.
- the general on-load tap changer needs to be switched by the polarity switch from the polarity to the polarity minus position.
- the valve group In the process of engineering commissioning, the valve group needs to start and stop multiple times, and the converter transformer also needs to be subjected to the closing impact and the polarity switching of the multiple voltage regulating switch multiple times.
- the on-load tap changer needs to switch part of the line-to-ground capacitance when the polarity switch is activated. In this case, the polarity switch will still cause spark discharge between the contacts. Thereby, a discharge characteristic gas acetylene is produced.
- a small amount of acetylene caused by a slight discharge during the polarity switching operation may cause a slight abnormality of the acetylene gas during the oil color separation analysis of the converter transformer.
- the converter transformer continues to operate, there is a certain safety problem; if the operation is stopped, a new transformer needs to be replaced, which not only causes a power failure but also increases the operating cost of the power grid. Summary of the invention
- the AC side of the converter transformer further includes a second switch, a third switch and a fourth switch, and one end of the second switch is connected to the main line of the AC side.
- the low voltage end is connected to the other end.
- the other end of the second resistor is connected to the positive pole of the voltage regulating line , through the fourth switch, and the other end is grounded.
- One end of the third resistor is connected to the negative pole of the voltage regulating line ⁇ through the fourth switch, and the other end is grounded.
- FIG. 1 shows the schematic diagram of the AC side of the existing HVDC converter transformer.
- the AC side of the converter transformer includes an AC side main line ⁇ 110 and a voltage regulating line. ⁇ 120, the switch 130 and the resistor 160, one end of the AC side main line ⁇ 110 is connected to the high voltage, and the other end is connected to the polarity switch 150 through the switch 142, and the two selected ends of the polarity switch 150 are respectively connected to the positive pressure regulating line ⁇ 120
- the voltage regulating line 120 is provided with a plurality of voltage regulating ports.
- One end of the switching switch 130 is connected to one of the voltage regulating ports, and the other end is grounded.
- the AC side of the converter transformer further includes a switch 140, one end of which is connected to the low voltage end of the AC side main line ⁇ 110, and the other end is grounded.
- the AC side of the converter transformer also includes a control device (not shown) for controlling the operation of the switch.
- the switch 142 In the normal working state, the switch 142 is closed, the switch 170 and the switch 140 are disconnected, the polarity switch 150 is connected to one end of the voltage regulating line 120, and one of the voltage regulating ports of the voltage regulating line 120 is connected to the switch 130.
- the switching switch 130 By switching the switching switch 130 between the different voltage regulating ports of the voltage regulating line 120, the size of the alternating current side winding can be changed, thereby changing the voltage value of the alternating current side.
- Uhv is the voltage value of the network side line
- Urw is the voltage value of the voltage regulating line ⁇ .
- the on-load tap changer polarity switch when the on-load tap changer polarity switch operates, its polarity switch must cut the capacitive voltage. Although the resistor 160 is connected, the on-load tap changer needs to switch part of the line-to-ground capacitance when the polarity switch 150 is activated.
- the equivalent circuit diagram is shown in Figure 3. In this case, the polarity switch 150 still causes spark discharge between the contacts when it operates, thereby generating a discharge gas acetylene.
- FIG 4 is a schematic illustration of one embodiment of a high voltage DC converter transformer of the present invention, showing only portions of the AC side.
- the AC side of the converter transformer includes an AC side main line ⁇ 210, a voltage regulating line ⁇ 220, a changeover switch 230, and a first resistor 260.
- One end of the AC side main line ⁇ 210 is connected to a high voltage, and the other end passes the first
- the switch 242 is connected to the polarity switch 250.
- the two selected ends of the polarity switch 250 are respectively connected to the positive and negative ends of the voltage regulating line 220, and the voltage regulating line 220 is provided with a plurality of voltage regulating ports, one end of the switching switch 230 and the like.
- the first switch 242 is closed, the second switch 240 is disconnected, the first selection switch 270 is suspended, and the polarity switch 250 is connected to one end of the voltage regulating line 220, and one of the voltage regulating ports of the voltage regulating line 220 is connected. It is connected to the changeover switch 230.
- the switch 230 By switching the switch 230 between the different voltage regulating ports of the voltage regulating line 220, the size of the alternating current side winding can be changed, thereby changing the voltage value of the alternating current side.
- the converter transformer Since it takes a certain amount of time when the polarity switch operates, it is opened in polarity. When the operation is turned off, the converter transformer needs to take certain measures to ensure the safety of the switching action.
- the process will be described by taking the polarity switch 250 from the positive electrode of the pressure regulating line ⁇ 220 to the negative electrode as an example.
- the polarity switch 250 is connected to the negative voltage of the voltage regulating line ,, the first selection switch 270 is disconnected from the voltage regulating line ⁇ 220, and is in a floating state, and the switching switch 230 and the voltage regulating line are switched.
- the ⁇ 220 is connected, the first switch 242 is closed; then, the second switch 240 is turned off, and the converter transformer returns to the normal working state.
- the operation of the converter transformer of the present embodiment has been described above by taking the polarity switch 250 from the positive pole of the voltage regulating line 220 to the negative pole as an example. If the polarity switch 250 is switched from the negative terminal of the pressure regulating line ⁇ 220 to the positive pole, the above process is largely unchanged, except that the first selection switch 270 is connected to the negative pole of the pressure regulating line ⁇ 220.
- Fig. 6 is a schematic view showing another embodiment of the high-voltage DC converter transformer of the present invention, showing only the portion on the AC side.
- the AC side of the converter transformer includes an AC side main line ⁇ 210, a voltage regulating line ⁇ 220, a changeover switch 230, a second resistor 262, and a third resistor 264, and one end of the AC side main line ⁇ 210 is connected to a high voltage. The other end is connected to the polarity switch 250 through the first switch 242.
- the AC side of the converter transformer also includes a control device (not shown) for controlling the operation of the switch.
- the control device can be a mechanical switch control mechanism, such as a travel mechanism, or the like.
- the switch 240 When the polarity switch 250 needs to be operated, the switch 240 is first closed, so that the low-voltage end of the AC-side main line ⁇ 210 is grounded through the switch 240; then, the first switch 242 is opened, and the switch 230 and the voltage-regulating line ⁇ 220 are disconnected. On, the third switch 272 is closed; thereafter, the polarity switch 250 starts switching, switching from the positive terminal of the voltage regulating line 220 to the negative terminal.
- the polarity switch 250 After the switching operation of the polarity switch 250 is completed, the polarity switch 250 is connected to the negative pole of the voltage regulating line ,, the third switch 272 is turned off, the switching switch 230 is connected to the voltage regulating line 220, and the first switch 242 is closed; The second switch 240 is disconnected, and the converter transformer returns to normal operation.
- the second resistor 262 and the third resistor 264 have different functions and properties from the resistor 160 in the present embodiment.
- the second resistor 262 and the third resistor 264 are discharge resistors, and the resistance is small. It can be between 50 ohms and 5000 ohms, it can be a fixed resistance, such as 500 ohms, or it can be a variable resistor, and its resistance can be adjusted within a certain range between 50 ohms and 5000 ohms, for example, it can be 100 ohms.
- the resistance is adjustable to 500 ohms; and the resistor 160 is a potential resistor, and its resistance is relatively large, generally above 1 M ohm, and is generally a variable resistor.
- the resistance values of the second resistor 262 and the third resistor 264 may be the same or different.
- first switch 242 and the second switch 240 described in this embodiment may be two separate switches, such as two separate mechanical switches, or may be an integral switch, such as a sliding switch, through which sliding The action realizes the functions of the first switch and the second switch at the same time.
- third switch 272 and the fourth switch 274 The same is true of the third switch 272 and the fourth switch 274, and the structure can be various as long as the above functions can be realized.
- the high-voltage DC converter transformer of the present invention fundamentally solves the discharge performance during the polarity switching operation.
- the generation of gaseous acetylene effectively avoids the safety problems caused by the generation of acetylene gas.
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Abstract
A high voltage direct current (HVDC) converter transformer and method for on-load tap change (OLTC) switch connection thereof, wherein said HVDC converter transformer comprises DC and AC sides; the AC side comprises an AC side main coil, voltage regulation coil, transfer switch and first resistor; a terminal of the AC side main coil is connected to high voltage, the other terminal is connected through a first switch to a polarity switch; two selection terminals of the polarity switch are connected to the positive and negative terminals of the voltage regulation coil respectively; the voltage regulation coil is disposed with a plurality of voltage regulation terminal ports; a terminal of the transfer switch is connected to one of said voltage regulation terminal ports, the other terminal is grounded; the AC side of said converter transformer also comprises a second switch and first selector switch; one terminal of the second switch is connected to the low voltage terminal of the AC side main coil, the other terminal is grounded; a terminal of the first resistor is connected to the positive or negative terminal of the voltage regulation coil respectively via the first selector switch, and the other terminal is grounded. This method greatly reduces the production of acetylene gas, and allows the converter transformer to operate more safely and reliably.
Description
一种高压直流换流变压器及其有载调压开关连接方法 技术领域 High-voltage DC converter transformer and its on-load voltage regulating switch connection method
本发明涉及一种变压器， 特别是一种用于高压直流输电的换 流变压器。 背景技术 The present invention relates to a transformer, and more particularly to a converter transformer for high voltage direct current transmission. Background technique
高压直流输电在电网建设中， 对于长距离送电和大区联网有 着非常广阔的发展前景， 是目前作为解决高电压、 大容量、 长距 离送电和异步联网的重要手段。 高压直流输电利用稳定的直流电 具有无感抗、 容抗也不起作用、 无同步问题等优点而采用的大功 率远距离直流输电。 输电过程为直流。 高压直流输电常用于架空 线和海底电缆输电， 非同步运行的交流***之间的连络等方面。 In the construction of power grids, HVDC transmission has a very broad development prospect for long-distance power transmission and large-area networking. It is currently an important means to solve high-voltage, large-capacity, long-distance power transmission and asynchronous networking. High-voltage direct current transmission utilizes stable direct current with high-power long-distance direct current transmission without the advantages of non-inductive reactance, capacitive reactance, and no synchronization problems. The transmission process is DC. HVDC transmission is commonly used for transmission of overhead lines and submarine cables, and communication between asynchronously operating AC systems.
高压直流输电是将三相交流电通过换流站整流变成直流电， 然后通过直流输电线路送往另一个换流站逆变成三相交流电的输 电方式。 它基本上由两个换流站和直流输电线组成， 两个换流站 与两端的交流***相连接。 换流站的主要设备包括换流器、 换流 变压器、 平波电抗器、 交流滤波器、 直流避雷器及控制保护设备 等。 The high-voltage direct current transmission is a transmission method in which three-phase alternating current is rectified into a direct current through a converter station, and then sent to another converter station through a direct current transmission line to be converted into a three-phase alternating current. It consists essentially of two converter stations and a DC transmission line, which are connected to the AC system at both ends. The main equipment of the converter station includes inverters, converter transformers, smoothing reactors, AC filters, DC arresters and control protection equipment.
换流变压器是换流站的主要设备， 也是直流输电***的主要 设备， 其主要参数按直流***的特殊要求确定。 换流变压器的作 用是向换流器供给交流功率或从换流器接受交流功率， 并且将网 侧交流电压变换成阀侧所需要的电压。 The converter transformer is the main equipment of the converter station and the main equipment of the DC transmission system. The main parameters are determined according to the special requirements of the DC system. The function of the converter transformer is to supply AC power to the inverter or to receive AC power from the inverter, and to convert the grid side AC voltage to the voltage required on the valve side.
在整流站， 用换流变压器将交流***和直流***隔离， 通过 换流装置将交流网络的电能转换为高压直流电能， 利用高压直流 输电线路传输； 在逆变站， 通过换流装置将直流电能转换为交流 电能， 再通过换流变压器送到交流电网； 从而实现交流输电网络
与高压直流输电网络的联络。 换流变压器提供相位差为 30°的 12 脉波交流电压， 以降低交流侧谐波电流， 特别是 5次和 7次谐波 电流； 作为交流***和直流***的电气隔离， 削弱侵入直流*** 的交流侧过电压； 通过换流变压器的阻抗限制直流***的短路电 流进入交流***； 通过换流变压器可以实现直流电压较大幅度的 分档调节。 In the rectification station, the AC system is isolated from the DC system by a converter transformer, and the electric energy of the AC network is converted into high-voltage DC power through the commutation device, and transmitted by the HVDC transmission line; in the inverter station, the DC energy is converted by the converter device. Converted to AC power, and then sent to the AC grid through the converter transformer; thus achieving AC transmission network Liaison with the HVDC transmission network. The converter transformer provides a 12-pulse AC voltage with a phase difference of 30° to reduce the AC side harmonic current, especially the 5th and 7th harmonic currents; as an electrical isolation between the AC system and the DC system, weakening the intrusion DC system The AC side overvoltage; the short circuit current of the DC system is limited to enter the AC system through the impedance of the converter transformer; the DC voltage can be adjusted by a converter transformer.
在高压直流输电工程中， 因适应阀组各种不同运行工况、 阀 侧电压调节范围需求较大等原因， 换流变压器一般调压档位较多 (例如 29档）。 在此情况下， 换流变压器均将调压方式设计为正 反调压， 这样换流变仅需一半调压档位线圏就可满足工程需要。 这也是高压直流输电工程中常用的调压方式。 国内大部分运行和 在建的高压、 特高压直流输电工程中换流变压器调压的布置方式 均如此。 例如， 通过极性转换开关的转换， 14 个档位的调压线 圏， 就可实现 29档的功能需求。 In the HVDC transmission project, the converter transformer generally has more pressure regulating gears (for example, 29 gears) due to various operating conditions of the valve group and large demand for the valve side voltage regulation range. Under this circumstance, the converter transformer is designed to adjust the pressure regulation method to positive and negative pressure regulation, so that the commutation transformer only needs half of the pressure regulation gear line to meet the engineering needs. This is also the common voltage regulation method used in HVDC transmission projects. This is true for the layout of converter transformers in most high-voltage and UHV DC transmission projects in operation and under construction in China. For example, through the conversion of the polarity change switch, the voltage regulation line of 14 gears can realize the functional requirements of the 29th gear.
由于换流变压器和阀组直接相连， 为在冲击合闸时阀组承受 的电压最低、 同时降低换流变压器本身承受的冲击， 根据相关规 程， 所有换流变压器在带电前， 其档位均自动设定在交流侧绕组 最长的档位， 这样换流变压器本身在冲击合闸时为欠励磁， 而阀 侧电压为最低值， 是最安全的方式。 Since the converter transformer and the valve block are directly connected, the voltage of the valve group is the lowest at the time of the impact closing, and the impact of the converter transformer itself is reduced. According to the relevant regulations, all the converter transformers are automatically before the charging. Set the longest gear position on the AC side winding, so that the converter transformer itself is under-excited during the impact closing, and the valve side voltage is the lowest value, which is the safest way.
换流变在带电后再根据阀侧电压需要调整有载调压开关的档 位到适当位置， 然后再对阀组解锁。 在这个过程中， 一般有载调 压开关需经过极性开关转换， 从加极性到减极性的位置。 而在工 程调试过程中， 阀组需多次启停， 换流变压器也需多次受到合闸 冲击和多次调压开关的极性转换。 After the converter is energized, adjust the gear of the on-load tap changer to the appropriate position according to the valve side voltage, and then unlock the valve block. In this process, the general on-load tap changer needs to be switched by the polarity switch from the polarity to the polarity minus position. In the process of engineering commissioning, the valve group needs to start and stop multiple times, and the converter transformer also needs to be subjected to the closing impact and the polarity switching of the multiple voltage regulating switch multiple times.
尽管采取了正反极性调压的方式， 高压直流换流变压器调压 线圏档位还是较多。 一般换流变压器在设计时， 所有调压线圏单 独绕制为一圏， 在换流变制造时不论是在阀侧电压较低时放置在
最外侧或是阀侧电压较高时放置在最内侧， 调压线圏均有较大的 对地电容。 Despite the positive and negative polarity voltage regulation, the high voltage DC converter transformer voltage regulation line is still more. Generally, when the converter transformer is designed, all the pressure regulating wires are individually wound into one turn, which is placed in the commutation manufacturing when the voltage on the valve side is low. When the outermost side or the valve side voltage is high, it is placed on the innermost side, and the voltage regulating line has a large capacitance to the ground.
这样在有载调压开关极性开关动作时， 其极性开关均要切电 容性电压。 为限制此电压， 有载调压开关在极性开关动作前， 在 调压线圏的中间档， 先接入一个电位电阻， 可一定程度上降低极 性开关切换时在极性档位之间的放电。 In this way, when the on-load tap changer polarity switch is activated, its polarity switch must cut the capacitive voltage. In order to limit this voltage, the on-load tap changer is connected to a potential resistor in the middle of the voltage regulation line before the polarity switch is actuated, which can reduce the polarity switch between polarity switches when the polarity switch is switched to some extent. Discharge.
尽管接入了电位电阻， 有载调压开关在极性开关动作时， 仍 需切换部分线圏对地电容， 在这种情况下， 极性开关动作时仍然 会引起触头间的火花放电， 从而产生出放电性特征气体乙炔。 这 样， 如果极性开关动作次数增多， 在极性开关动作时的轻微放电 引起的少量乙炔在多次积累后， 就可能造成换流变压器油色傳分 析时乙炔气体的轻微异常。 在此情况下， 如果该换流变压器继续 运行， 则存在一定的安全问题； 如果停止运行， 则需要更换新的 变压器， 不仅会造成停电事故， 还会增加电网运行成本。 发明内容 Although the potential resistor is connected, the on-load tap changer needs to switch part of the line-to-ground capacitance when the polarity switch is activated. In this case, the polarity switch will still cause spark discharge between the contacts. Thereby, a discharge characteristic gas acetylene is produced. Thus, if the number of polarity switching operations increases, a small amount of acetylene caused by a slight discharge during the polarity switching operation may cause a slight abnormality of the acetylene gas during the oil color separation analysis of the converter transformer. In this case, if the converter transformer continues to operate, there is a certain safety problem; if the operation is stopped, a new transformer needs to be replaced, which not only causes a power failure but also increases the operating cost of the power grid. Summary of the invention
为了解决上述问题， 本发明提供了一种高压直流换流变压器 及其有载调压开关连接方法， 通过改变换流变压器调压线圏侧的 电路连接方式， 避免了在极性开关动作时的线圏放电， 从而阻止 了乙炔气体的产生。 In order to solve the above problems, the present invention provides a high-voltage DC converter transformer and an on-load tap changer connection method thereof. By changing the circuit connection mode on the side of the converter transformer voltage regulation line, the polarity switch operation is avoided. The wire is discharged, thereby preventing the generation of acetylene gas.
具体的， 本发明提供了一种高压直流换流变压器， 包括直流 侧和交流侧， 交流侧包括交流侧主线圏、 调压线圏、 切换开关和 第一电阻， 交流侧主线圏的一端连接高电压， 另一端通过第一开 关连接极性开关， 极性开关的两个选择端分别连接调压线圏的正 负两端， 调压线圏设置有多个调压端口， 切换开关的一端与这些 调压端口的其中一个连接， 另一端接地； 该换流变压器的交流侧 还包括第二开关和第一选择开关， 第二开关的一端连接交流侧主
线圏的低压端， 另一端接地； 第一电阻的一端通过第一选择开关 分别连接调压线圏的正负两端， 另一端接地。 Specifically, the present invention provides a high-voltage DC converter transformer including a DC side and an AC side, and the AC side includes an AC side main line 调, a voltage regulating line 圏, a switch and a first resistor, and one end of the AC side main line 连接 is connected high. The other end is connected to the polarity switch through the first switch. The two selected ends of the polarity switch are respectively connected to the positive and negative ends of the voltage regulating line ,, and the voltage regulating line 圏 is provided with a plurality of voltage regulating ports, one end of the switching switch is One of the voltage regulating ports is connected, and the other end is grounded; the AC side of the converter transformer further includes a second switch and a first selection switch, and one end of the second switch is connected to the AC side main The low voltage end of the coil is grounded, and the other end is grounded; one end of the first resistor is respectively connected to the positive and negative ends of the voltage regulating line 通过 through the first selection switch, and the other end is grounded.
本发明还提供了一种高压直流换流变压器有载调压开关连接 方法， 所述高压直流换流变压器的交流侧包括交流侧主线圏、 调 压线圏、 切换开关、 第一开关和第二开关， 交流侧主线圏的一端 连接高电压， 另一端通过第一开关连接极性开关， 极性开关的两 个选择端分别连接调压线圏的正负两端， 调压线圏设置有多个调 压端口， 切换开关的一端与这些调压端口的其中一个连接， 另一 端接地； 第二开关的一端连接交流侧主线圏的低压端， 另一端接 地； 所述交流侧还包括第一电阻和第一选择开关， 第一电阻的一 端通过第一选择开关分别连接调压线圏的正负两端， 另一端接 地。 The invention also provides a method for connecting an on-load voltage regulating switch of a high-voltage DC converter transformer, wherein the AC side of the high-voltage DC converter transformer comprises an AC side main line 调, a voltage regulating line 圏, a switch, a first switch and a second The switch, one end of the AC side main line 连接 is connected to the high voltage, and the other end is connected to the polarity switch through the first switch, and the two selected ends of the polarity switch are respectively connected to the positive and negative ends of the voltage regulating line ,, and the voltage regulating line 圏 is set a voltage regulating port, one end of the switch is connected to one of the voltage regulating ports, and the other end is grounded; one end of the second switch is connected to the low voltage end of the main line of the AC side, and the other end is grounded; the AC side further includes a first resistor And the first selection switch, one end of the first resistor is respectively connected to the positive and negative ends of the voltage regulating line 通过 through the first selection switch, and the other end is grounded.
本发明还提供了另一种高压直流换流变压器， 包括直流侧和 交流侧， 交流侧包括交流侧主线圏、 调压线圏、 切换开关、 第二 电阻和第三电阻， 交流侧主线圏的一端连接高电压， 另一端通过 第一开关连接极性开关， 极性开关的两个选择端分别连接调压线 圏的正负两端， 调压线圏设置有多个调压端口， 切换开关的一端 与这些调压端口的其中一个连接， 另一端接地； 另外， 该换流变 压器的交流侧还包括第二开关、 第三开关和第四开关， 第二开关 的一端连接交流侧主线圏的低压端， 另一端接地； 第二电阻的一 端通过第四开关连接调压线圏的正极， 另一端接地； 第三电阻的 一端通过第四开关连接调压线圏的负极， 另一端接地。 The invention also provides another high-voltage DC converter transformer, which comprises a DC side and an AC side, and the AC side comprises an AC side main line 调, a voltage regulating line 圏, a switch, a second resistor and a third resistor, and an AC side main line 圏One end is connected to the high voltage, and the other end is connected to the polarity switch through the first switch. The two selected ends of the polarity switch are respectively connected to the positive and negative ends of the voltage regulating line ,, and the voltage regulating line 圏 is provided with a plurality of voltage regulating ports, the switching switch One end of the voltage regulating port is connected to one of the voltage regulating ports, and the other end is grounded. In addition, the AC side of the converter transformer further includes a second switch, a third switch and a fourth switch, and one end of the second switch is connected to the main line of the AC side. The low voltage end is connected to the other end. The other end of the second resistor is connected to the positive pole of the voltage regulating line , through the fourth switch, and the other end is grounded. One end of the third resistor is connected to the negative pole of the voltage regulating line 通过 through the fourth switch, and the other end is grounded.
本发明还提供了一种高压直流换流变压器有载调压开关连接 方法， 所述高压直流换流变压器的交流侧包括交流侧主线圏、 调 压线圏、 切换开关、 第一开关和第二开关， 交流侧主线圏的一端 连接高电压， 另一端通过第一开关连接极性开关， 极性开关的两 个选择端分别连接调压线圏的正负两端， 调压线圏设置有多个调
压端口， 切换开关的一端与这些调压端口的其中一个连接， 另一 端接地； 第二开关的一端连接交流侧主线圏的低压端， 另一端接 地； 所述交流侧还包括第二电阻、 第三电阻、 第三开关和第四开 关， 第二电阻的一端通过第三开关调压线圏的正极端， 另一端接 地， 第三电阻的一端通过第四开关调压线圏的负极端， 另一端接 地。 The invention also provides a method for connecting an on-load voltage regulating switch of a high-voltage DC converter transformer, wherein the AC side of the high-voltage DC converter transformer comprises an AC side main line 调, a voltage regulating line 圏, a switch, a first switch and a second The switch, one end of the AC side main line 连接 is connected to the high voltage, and the other end is connected to the polarity switch through the first switch, and the two selected ends of the polarity switch are respectively connected to the positive and negative ends of the voltage regulating line ,, and the voltage regulating line 圏 is set Tune a voltage port, one end of the switch is connected to one of the voltage regulating ports, and the other end is grounded; one end of the second switch is connected to the low voltage end of the main line of the AC side, and the other end is grounded; the AC side further includes a second resistor, a third resistor, a third switch and a fourth switch, one end of the second resistor is passed through the third switch to regulate the positive terminal of the wire ,, and the other end is grounded, and one end of the third resistor is passed through the fourth switch to regulate the negative terminal of the wire ,, One end is grounded.
本发明的高压直流换流变压器改变了原有的交流侧线路连接 方式， 彻底解决了在极性开关动作时， 调压线圏杂散电容放电不 完全的缺点， 从而大大减少了乙炔气体的产生， 使换流变压器的 工作更为安全可靠。 附图说明 The high-voltage DC converter transformer of the invention changes the original AC side line connection mode, completely solves the shortcoming of the incomplete discharge of the voltage regulator line stray capacitance during the polarity switching action, thereby greatly reducing the generation of acetylene gas. , making the work of the converter transformer safer and more reliable. DRAWINGS
图 1所示为现有的高压直流换流变压器交流侧的原理图。 图 2所示为调压线圏调压在最外侧时的原理图。 Figure 1 shows the schematic diagram of the AC side of the existing HVDC converter transformer. Figure 2 shows the schematic diagram of the pressure regulation line 圏 at the outermost side.
图 3 所示为现有的高压直流换流变压器在极性开关动作时的 等效电路图。 Figure 3 shows the equivalent circuit diagram of the existing high-voltage DC converter transformer when the polarity switch is activated.
图 4 所示为本发明的高压直流换流变压器的一个实施例的示 意图。 Figure 4 is a schematic illustration of one embodiment of a high voltage DC converter transformer of the present invention.
图 5 所示为本发明的第一实施例的高压直流换流变压器在极 性开关动作时的等效电路图。 Fig. 5 is a view showing an equivalent circuit diagram of the high-voltage DC converter transformer of the first embodiment of the present invention in a polarity switching operation.
图 6所示为本发明的高压直流换流变压器的另一个实施例的 示意图。 具体实施方式 Fig. 6 is a schematic view showing another embodiment of the high voltage direct current converter transformer of the present invention. detailed description
下面结合附图详细说明本发明的优选实施例。 Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
图 1 所示为现有的高压直流换流变压器交流侧的原理图。 如 图所示， 该换流变压器的交流侧包括交流侧主线圏 110、 调压线
圏 120、 切换开关 130和电阻 160， 交流侧主线圏 110的一端连接 高电压， 另一端通过开关 142 连接极性开关 150， 极性开关 150 的两个选择端分别连接调压线圏 120 的正负两端， 调压线圏 120 设置有多个调压端口， 切换开关 130 的一端与这些调压端口的其 中一个连接， 另一端接地， 电阻 160的一端通过开关 170连接在 调压线圏 120 的中间， 另一端接地； 另外， 该换流变压器的交流 侧还包括开关 140， 一端连接交流侧主线圏 110 的低压端， 另一 端接地。 该换流变压器的交流侧还包括一个控制装置（图中未示 出）， 用于控制上述开关的动作。 Figure 1 shows the schematic diagram of the AC side of the existing HVDC converter transformer. As shown in the figure, the AC side of the converter transformer includes an AC side main line 圏110 and a voltage regulating line. 圏120, the switch 130 and the resistor 160, one end of the AC side main line 圏110 is connected to the high voltage, and the other end is connected to the polarity switch 150 through the switch 142, and the two selected ends of the polarity switch 150 are respectively connected to the positive pressure regulating line 圏120 At the negative ends, the voltage regulating line 120 is provided with a plurality of voltage regulating ports. One end of the switching switch 130 is connected to one of the voltage regulating ports, and the other end is grounded. One end of the resistor 160 is connected to the voltage regulating line 120 through the switch 170. In the middle, the other end is grounded. In addition, the AC side of the converter transformer further includes a switch 140, one end of which is connected to the low voltage end of the AC side main line 圏110, and the other end is grounded. The AC side of the converter transformer also includes a control device (not shown) for controlling the operation of the switch.
正常工作状态下， 开关 142 闭合， 开关 170 和开关 140 断 开， 极性开关 150 与调压线圏 120 的其中一端连接， 调压线圏 120 的其中一个调压端口与切换开关 130连接。 这样， 通过切换 开关 130在调压线圏 120的不同调压端口之间的切换， 就可以改 变交流侧绕组的大小， 从而改变交流侧的电压值。 In the normal working state, the switch 142 is closed, the switch 170 and the switch 140 are disconnected, the polarity switch 150 is connected to one end of the voltage regulating line 120, and one of the voltage regulating ports of the voltage regulating line 120 is connected to the switch 130. Thus, by switching the switching switch 130 between the different voltage regulating ports of the voltage regulating line 120, the size of the alternating current side winding can be changed, thereby changing the voltage value of the alternating current side.
当极性开关 150 需要动作时， 开关 140 闭合； 接着， 开关 142 闭合， 切换开关 130与调压线圏 120断开； 此后， 开关 170 闭合， 极性开关 150开始切换； 当极性开关 150动作完成之后， 开关 170断开， 切换开关 130与调压线圏 120连接， 开关 140断 开； 最后， 开关 142闭合， 换流变压器回复正常工作状态。 When the polarity switch 150 needs to operate, the switch 140 is closed; then, the switch 142 is closed, the switch 130 is disconnected from the voltage regulating line 120; thereafter, the switch 170 is closed, the polarity switch 150 starts to switch; when the polarity switch 150 is activated After completion, the switch 170 is opened, the switch 130 is connected to the voltage regulating line 120, and the switch 140 is turned off. Finally, the switch 142 is closed and the converter transformer is returned to the normal operating state.
正如前面所述的那样， 换流变压器在设计时， 所有调压线圏 单独绕制为一圏， 在换流变制造时不论是在阀侧电压较低时放置 在最外侧或是阀侧电压较高时放置在最内侧， 调压线圏均有较大 的对地电容。 As mentioned above, when the converter transformer is designed, all the pressure regulating wires are individually wound into one turn, which is placed at the outermost side or the valve side voltage when the valve side voltage is low. When it is higher, it is placed at the innermost side, and the voltage regulating line has a large capacitance to the ground.
以调压线圏调压在最外侧为例， 其原理图如图 2所示。 Take the pressure regulation line 圏 on the outermost side as an example, the schematic diagram is shown in Figure 2.
在此情况下， 正负极性之间的电压分布计算如下： In this case, the voltage distribution between positive and negative polarity is calculated as follows:
T T CI Uhv , Urw TT CI Uhv , Urw
U = x 士 U = x 士
C1 + C2 2 2
其中， Uhv 为网侧线圏的电压值， Urw 为调压线圏的电压 值。 C1 + C2 2 2 Among them, Uhv is the voltage value of the network side line ,, and Urw is the voltage value of the voltage regulating line 。.
这样， 在有载调压开关极性开关动作时， 其极性开关均要切 电容性电压。 尽管接入了电阻 160， 有载调压开关在极性开关 150 动作时， 仍需切换部分线圏对地电容， 其等效电路图如图 3 所示。 在这种情况下， 极性开关 150动作时仍然会引起触头间的 火花放电， 从而产生放电性气体乙炔。 Thus, when the on-load tap changer polarity switch operates, its polarity switch must cut the capacitive voltage. Although the resistor 160 is connected, the on-load tap changer needs to switch part of the line-to-ground capacitance when the polarity switch 150 is activated. The equivalent circuit diagram is shown in Figure 3. In this case, the polarity switch 150 still causes spark discharge between the contacts when it operates, thereby generating a discharge gas acetylene.
图 4 所示为本发明的高压直流换流变压器的一个实施例的示 意图， 图中只示出了交流侧的部分。 如图所示， 该换流变压器的 交流侧包括交流侧主线圏 210、 调压线圏 220、 切换开关 230和 第一电阻 260， 交流侧主线圏 210 的一端连接高电压， 另一端通 过第一开关 242连接极性开关 250， 极性开关 250的两个选择端 分别连接调压线圏 220的正负两端， 调压线圏 220设置有多个调 压端口， 切换开关 230 的一端与这些调压端口的其中一个连接， 另一端接地； 另外， 该换流变压器的交流侧还包括第二开关 240 和第一选择开关 270， 第二开关 240 的一端连接交流侧主线圏 210 的低压端， 另一端接地； 第一电阻 260 的一端通过第一选择 开关 270分别连接调压线圏 220的正负两端， 另一端接地。 换流 变压器的交流侧还包括一个控制装置 （图中未示出）， 用于控制 上述开关的动作， 该控制装置可以是一种机械开关控制机构， 例 如行程机构等， 也可以是类似装置。 Figure 4 is a schematic illustration of one embodiment of a high voltage DC converter transformer of the present invention, showing only portions of the AC side. As shown in the figure, the AC side of the converter transformer includes an AC side main line 圏210, a voltage regulating line 圏220, a changeover switch 230, and a first resistor 260. One end of the AC side main line 圏210 is connected to a high voltage, and the other end passes the first The switch 242 is connected to the polarity switch 250. The two selected ends of the polarity switch 250 are respectively connected to the positive and negative ends of the voltage regulating line 220, and the voltage regulating line 220 is provided with a plurality of voltage regulating ports, one end of the switching switch 230 and the like. One side of the voltage regulating port is connected, and the other end is grounded. In addition, the AC side of the converter transformer further includes a second switch 240 and a first selection switch 270, and one end of the second switch 240 is connected to the low voltage end of the AC side main line 圏210, The other end is grounded; one end of the first resistor 260 is respectively connected to the positive and negative ends of the voltage regulating line 220 through the first selection switch 270, and the other end is grounded. The AC side of the converter transformer also includes a control device (not shown) for controlling the operation of the switch. The control device can be a mechanical switch control mechanism, such as a travel mechanism, or the like.
正常工作状态下， 第一开关 242闭合， 第二开关 240断开， 第一选择开关 270悬空， 极性开关 250与调压线圏 220的一端连 接， 调压线圏 220的其中一个调压端口与切换开关 230连接。 这 样， 通过切换开关 230在调压线圏 220的不同调压端口之间的切 换， 就可以改变交流侧绕组的大小， 从而改变交流侧的电压值。 In the normal working state, the first switch 242 is closed, the second switch 240 is disconnected, the first selection switch 270 is suspended, and the polarity switch 250 is connected to one end of the voltage regulating line 220, and one of the voltage regulating ports of the voltage regulating line 220 is connected. It is connected to the changeover switch 230. Thus, by switching the switch 230 between the different voltage regulating ports of the voltage regulating line 220, the size of the alternating current side winding can be changed, thereby changing the voltage value of the alternating current side.
由于在极性开关动作时需要花费一定的时间， 因此在极性开
关动作时， 换流变压器需要采取一定的措施确保开关动作的安 全。 下面以极性开关 250从调压线圏 220 的正极切换到负极为 例， 对这一过程进行说明。 Since it takes a certain amount of time when the polarity switch operates, it is opened in polarity. When the operation is turned off, the converter transformer needs to take certain measures to ensure the safety of the switching action. Hereinafter, the process will be described by taking the polarity switch 250 from the positive electrode of the pressure regulating line 圏220 to the negative electrode as an example.
当极性开关 250需要动作时， 首先开关 240闭合， 这样， 交 流侧主线圏 210的低压端就会通过开关 240接地； 接着， 第一开 关 242断开， 切换开关 230与调压线圏 220断开， 第一选择开关 270连接调压线圏 220的正极； 此后极性开关 250开始切换， 从 调压线圏 220的正极端切换到负极端。 当极性开关 250切换动作 完成之后， 极性开关 250与调压线圏的负^目连， 第一选择开关 270与调压线圏 220断开， 呈悬空状态， 切换开关 230与调压线 圏 220连接， 第一开关 242闭合； 接着， 第二开关 240断开， 换 流变压器回复正常工作状态。 When the polarity switch 250 needs to be operated, the switch 240 is first closed, so that the low-voltage end of the AC-side main line 圏210 is grounded through the switch 240; then, the first switch 242 is opened, and the switch 230 and the voltage-regulating line 圏 220 are disconnected. The first selection switch 270 is connected to the positive pole of the voltage regulating line 220; thereafter, the polarity switch 250 starts switching, switching from the positive terminal of the voltage regulating line 220 to the negative terminal. After the switching operation of the polarity switch 250 is completed, the polarity switch 250 is connected to the negative voltage of the voltage regulating line ,, the first selection switch 270 is disconnected from the voltage regulating line 圏220, and is in a floating state, and the switching switch 230 and the voltage regulating line are switched. The 圏220 is connected, the first switch 242 is closed; then, the second switch 240 is turned off, and the converter transformer returns to the normal working state.
由于在极性开关 250的动作过程中， 第一电阻 260通过第一 选择开关 270 的连接， 与调压线圏 220组成了一个 RC放电电 路， 其等效电路图如图 5所示。 根据 RC电路的特性， 使得在极 性开关 250动作的过程中， 调压线圏 220放电完成， 这样， 就不 会在换流变压器中产生放电气体乙炔， 从而解决了现有技术中会 产生放电气体乙炔的技术问题。 Since the first resistor 260 is connected to the voltage regulating line 220 through the connection of the first selection switch 270 during the operation of the polarity switch 250, an equivalent circuit diagram is shown in FIG. According to the characteristics of the RC circuit, during the operation of the polarity switch 250, the voltage regulation line 220 is discharged, so that the discharge gas acetylene is not generated in the converter transformer, thereby solving the discharge generated in the prior art. Technical problem of gaseous acetylene.
上面是以极性开关 250从调压线圏 220的正极切换到负极为 例， 对本实施例的换流变压器的工作过程进行了说明。 如果极性 开关 250是从调压线圏 220的负极切换到正极， 上述的过程大都 不变， 不同的是， 第一选择开关 270连接的是调压线圏 220的负 极。 The operation of the converter transformer of the present embodiment has been described above by taking the polarity switch 250 from the positive pole of the voltage regulating line 220 to the negative pole as an example. If the polarity switch 250 is switched from the negative terminal of the pressure regulating line 圏 220 to the positive pole, the above process is largely unchanged, except that the first selection switch 270 is connected to the negative pole of the pressure regulating line 圏 220.
由于电路原理的不同， 本实施例中的第一电阻 260 与电阻 160 的作用和性质也有了区别， 第一电阻 260为放电电阻， 其阻 值较小， 可以在 50欧姆〜 5000欧姆之间， 可以是固定阻值， 例如 500欧姆， 也可以是可变电阻， 其阻值在 50欧姆至 5000欧姆之
间的一定范围内可调， 例如可以在 100 欧姆至 500 欧姆之间可 调； 而电阻 160 为电位电阻， 其阻值较大， 一般在 1M 欧姆以 上， 一般都采用可变电阻。 Due to the difference in circuit principle, the first resistor 260 and the resistor 160 have different functions and properties. The first resistor 260 is a discharge resistor, and the resistance is small, and can be between 50 ohms and 5000 ohms. It can be a fixed resistance, such as 500 ohms, or a variable resistor with a resistance of 50 ohms to 5000 ohms. It can be adjusted within a certain range, for example, it can be adjusted from 100 ohms to 500 ohms; and the resistor 160 is a potential resistor, which has a large resistance value, generally above 1 M ohm, and generally uses a variable resistor.
另外， 本实施例所述的第一开关 242、 第二开关 240 可以是 单独的两个开关， 例如两个单独的机械开关， 也可以是一个整体 的开关， 例如一个滑动开关， 通过其滑动的动作， 同时实现第一 开关和第二开关的功能。 第一选择开关 270可以是机械开关， 也 可以是电子开关， 只要能够满足上述过程的需要即可。 In addition, the first switch 242 and the second switch 240 described in this embodiment may be two separate switches, such as two separate mechanical switches, or may be an integral switch, such as a sliding switch, through which sliding The action realizes the functions of the first switch and the second switch at the same time. The first selection switch 270 may be a mechanical switch or an electronic switch as long as it satisfies the needs of the above process.
图 6 所示为本发明的高压直流换流变压器的另一个实施例的 示意图， 图中只示出了交流侧的部分。 如图所示， 该换流变压器 的交流侧包括交流侧主线圏 210、 调压线圏 220、 切换开关 230、 第二电阻 262和第三电阻 264， 交流侧主线圏 210的一端连接高 电压， 另一端通过第一开关 242 连接极性开关 250， 极性开关 250 的两个选择端分别连接调压线圏 220 的正负两端， 调压线圏 220设置有多个调压端口， 切换开关 230 的一端与这些调压端口 的其中一个连接， 另一端接地； 另外， 该换流变压器的交流侧还 包括第二开关 240、 第三开关 272和第四开关 274， 第二开关 240 的一端连接交流侧主线圏 210 的低压端， 另一端接地； 第二电阻 262的一端通过第四开关 272连接调压线圏 220的正极， 另一端 接地； 第三电阻 264的一端通过第四开关 274连接调压线圏 220 的负极， 另一端接地。 换流变压器的交流侧还包括一个控制装置 (图中未示出）， 用于控制上述开关的动作， 该控制装置可以是 一种机械开关控制机构， 例如行程机构等， 也可以是类似装置。 Fig. 6 is a schematic view showing another embodiment of the high-voltage DC converter transformer of the present invention, showing only the portion on the AC side. As shown in the figure, the AC side of the converter transformer includes an AC side main line 圏210, a voltage regulating line 圏220, a changeover switch 230, a second resistor 262, and a third resistor 264, and one end of the AC side main line 圏210 is connected to a high voltage. The other end is connected to the polarity switch 250 through the first switch 242. The two selected ends of the polarity switch 250 are respectively connected to the positive and negative ends of the voltage regulating line 圏220, and the voltage regulating line 圏220 is provided with a plurality of voltage regulating ports, and the switching switch One end of the 230 is connected to one of the voltage regulating ports, and the other end is grounded. In addition, the AC side of the converter transformer further includes a second switch 240, a third switch 272 and a fourth switch 274, and one end of the second switch 240 is connected. The low side of the main line 圏210 of the AC side is grounded, and the other end is grounded. One end of the second resistor 262 is connected to the anode of the voltage regulating line 220 through the fourth switch 272, and the other end is grounded. One end of the third resistor 264 is connected through the fourth switch 274. Press the negative pole of 圏220 and ground the other end. The AC side of the converter transformer also includes a control device (not shown) for controlling the operation of the switch. The control device can be a mechanical switch control mechanism, such as a travel mechanism, or the like.
正常工作状态下， 第一开关 242闭合， 第二开关 240断开， 第三开关 272 和第四开关 274 断开， 极性开关 250 与调压线圏 220 的一端连接， 调压线圏 220 的其中一个调压端口与切换开关 230连接。 这样， 通过切换开关 230在调压线圏 220的不同调压
端口之间的切换， 就可以改变交流侧绕组的大小， 从而改变交流 侧的电压值。 In the normal working state, the first switch 242 is closed, the second switch 240 is turned off, the third switch 272 and the fourth switch 274 are disconnected, and the polarity switch 250 is connected to one end of the voltage regulating line 220, and the voltage regulating line 220 is One of the voltage regulating ports is connected to the switch 230. Thus, different voltage regulation of the pressure regulating line 220 by the switch 230 By switching between ports, the size of the AC side winding can be changed to change the voltage value on the AC side.
由于在极性开关动作时需要花费一定的时间， 因此在极性开 关动作时， 换流变压器需要采取一定的措施确保开关动作的安 全。 下面以极性开关 250从调压线圏 220 的正极切换到负极为 例， 对这一过程进行说明。 Since it takes a certain time to operate the polarity switch, the converter transformer needs to take certain measures to ensure the safety of the switching action during the polarity switching operation. The process will be described below by taking the polarity switch 250 from the positive terminal of the pressure regulating line 圏 220 to the negative electrode as an example.
当极性开关 250需要动作时， 首先开关 240闭合， 这样， 交 流侧主线圏 210的低压端就会通过开关 240接地； 接着， 第一开 关 242断开， 切换开关 230与调压线圏 220断开， 第三开关 272 闭合； 此后极性开关 250开始切换， 从调压线圏 220的正极端切 换到负极端。 当极性开关 250切换动作完成之后， 极性开关 250 与调压线圏的负极相连， 第三开关 272断开， 切换开关 230与调 压线圏 220连接， 第一开关 242 闭合； 接着， 第二开关 240 断 开， 换流变压器回复正常工作状态。 When the polarity switch 250 needs to be operated, the switch 240 is first closed, so that the low-voltage end of the AC-side main line 圏210 is grounded through the switch 240; then, the first switch 242 is opened, and the switch 230 and the voltage-regulating line 圏 220 are disconnected. On, the third switch 272 is closed; thereafter, the polarity switch 250 starts switching, switching from the positive terminal of the voltage regulating line 220 to the negative terminal. After the switching operation of the polarity switch 250 is completed, the polarity switch 250 is connected to the negative pole of the voltage regulating line ,, the third switch 272 is turned off, the switching switch 230 is connected to the voltage regulating line 220, and the first switch 242 is closed; The second switch 240 is disconnected, and the converter transformer returns to normal operation.
由于在极性开关 250的动作过程中， 第二电阻 262通过第三 开关 272 的连接， 从而与调压线圏 220组成了一个 RC放电电 路， 其等效电路图如图 5所示。 Since the second resistor 262 is connected through the third switch 272 during the operation of the polarity switch 250, an RC discharge circuit is formed with the voltage regulating line 220, and an equivalent circuit diagram thereof is shown in FIG.
根据 RC电路的特性， 使得在极性开关 250动作的过程中， 调压线圏 220放电完成， 这样， 就不会在换流变压器中产生放电 气体乙炔， 从而解决了现有技术中会产生放电气体乙炔的技术问 题。 According to the characteristics of the RC circuit, during the operation of the polarity switch 250, the voltage regulation line 220 is discharged, so that the discharge gas acetylene is not generated in the converter transformer, thereby solving the discharge generated in the prior art. Technical problem of gaseous acetylene.
上面是以极性开关 250从调压线圏 220的正极切换到负极为 例， 对本实施例的换流变压器的工作过程进行说明。 如果极性开 关 250是从调压线圏 220的负极切换到正极， 上述的过程大都不 变， 不同的是， 第四开关 274代替第三开关 272动作。 这样， 在 极性开关 250的动作过程中， 第三电阻 264通过第四开关 274的 连接， 与调压线圏 220组成了一个 RC放电电路， 从而使得在极
性开关 250动作的过程中， 调压线圏 220放电完成， 因而不会在 换流变压器中产生放电气体乙炔， 解决了现有技术中会产生放电 气体乙炔的技术问题。 The above is an example in which the polarity switch 250 is switched from the positive electrode of the voltage regulating line 220 to the negative electrode, and the operation of the converter transformer of the present embodiment will be described. If the polarity switch 250 is switched from the negative terminal of the pressure regulating line 220 to the positive electrode, the above-described process is largely unchanged, except that the fourth switch 274 operates in place of the third switch 272. Thus, during the operation of the polarity switch 250, the third resistor 264 is connected to the voltage regulating line 220 through the connection of the fourth switch 274, thereby forming an RC discharge circuit. During the operation of the switch 250, the voltage regulation line 220 is discharged, so that the discharge gas acetylene is not generated in the converter transformer, which solves the technical problem that the discharge gas acetylene is generated in the prior art.
由于电路原理的不同， 本实施例中的第二电阻 262 和第三电 阻 264与电阻 160的作用和性质也有了区别， 第二电阻 262和第 三电阻 264为放电电阻， 其阻值较小， 可以在 50欧姆〜 5000欧姆 之间， 可以是固定阻值， 例如 500欧姆， 也可以是可变电阻， 其 阻值在 50欧姆至 5000欧姆之间的一定范围内可调， 例如可以在 100欧姆至 500欧姆之间可调； 而电阻 160为电位电阻， 其阻值 较大， 一般在 1M欧姆以上， 一般为可变电阻。 当然， 第二电阻 262和第三电阻 264的阻值可以使相同的， 也可以不相同。 The second resistor 262 and the third resistor 264 have different functions and properties from the resistor 160 in the present embodiment. The second resistor 262 and the third resistor 264 are discharge resistors, and the resistance is small. It can be between 50 ohms and 5000 ohms, it can be a fixed resistance, such as 500 ohms, or it can be a variable resistor, and its resistance can be adjusted within a certain range between 50 ohms and 5000 ohms, for example, it can be 100 ohms. The resistance is adjustable to 500 ohms; and the resistor 160 is a potential resistor, and its resistance is relatively large, generally above 1 M ohm, and is generally a variable resistor. Of course, the resistance values of the second resistor 262 and the third resistor 264 may be the same or different.
另外， 本实施例所述的第一开关 242、 第二开关 240 可以是 单独的两个开关， 例如两个单独的机械开关， 也可以是一个整体 的开关， 例如一个滑动开关， 通过其滑动的动作， 同时实现第一 开关和第二开关的功能。 第三开关 272 和第四开关 274 也是如 此， 只要能够实现上述功能， 其结构可以是多种多样的。 In addition, the first switch 242 and the second switch 240 described in this embodiment may be two separate switches, such as two separate mechanical switches, or may be an integral switch, such as a sliding switch, through which sliding The action realizes the functions of the first switch and the second switch at the same time. The same is true of the third switch 272 and the fourth switch 274, and the structure can be various as long as the above functions can be realized.
上面通过两个实施例对本发明的高压直流换流变压器的原理 及工作过程进行了说明， 相比现有技术， 本发明的高压直流换流 变压器从根本上解决了在极性开关动作时放电性气体乙炔的产 生， 从而有效地避免了因乙炔气体的产生而造成的安全问题。 The principle and working process of the high-voltage DC converter transformer of the present invention are described above by two embodiments. Compared with the prior art, the high-voltage DC converter transformer of the present invention fundamentally solves the discharge performance during the polarity switching operation. The generation of gaseous acetylene effectively avoids the safety problems caused by the generation of acetylene gas.
以上所述仅为本发明的优选实施方式， 应当指出， 对于本技 术领域的普通技术人员来说， 在不脱离本发明原理的前提下， 还 可以做出若干改动和润饰， 这些改进和润饰也应视为本发明的内 容。
The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several modifications and retouchings without departing from the principles of the present invention. It should be considered as the content of the present invention.
Claims
1、 一种高压直流换流变压器， 包括直流侧和交流侧， 其特 征在于： 所述交流侧包括交流侧主线圏、 调压线圏、 切换开关、 第一开关和第二开关， 交流侧主线圏的一端连接高电压， 另一端 通过第一开关连接极性开关， 极性开关的两个选择端分别连接调 压线圏的正负两端， 调压线圏设置有多个调压端口， 切换开关的 一端与这些调压端口的其中一个连接， 另一端接地； 第二开关的 一端连接交流侧主线圏的低压端， 另一端接地； 所述交流侧还包 括第一电阻和第一选择开关， 第一电阻的一端通过第一选择开关 分别连接调压线圏的正负两端， 另一端接地。 A high-voltage DC converter transformer, comprising a DC side and an AC side, wherein: the AC side comprises an AC side main line, a voltage regulating line, a switch, a first switch and a second switch, and an AC side main line. One end of the crucible is connected to the high voltage, and the other end is connected to the polarity switch through the first switch. The two selected ends of the polarity switch are respectively connected to the positive and negative ends of the voltage regulating line ,, and the voltage regulating line 圏 is provided with a plurality of voltage regulating ports. One end of the switch is connected to one of the voltage regulating ports, and the other end is grounded; one end of the second switch is connected to the low voltage end of the main line of the AC side, and the other end is grounded; the AC side further includes a first resistor and a first selection switch One end of the first resistor is respectively connected to the positive and negative ends of the voltage regulating line 通过 through the first selection switch, and the other end is grounded.
2、 根据权利要求 1 所述的高压直流换流变压器， 其特征在 于： 所述第一电阻为固定电阻， 其阻值在 50欧姆至 5000欧姆之 间。 2. The high voltage DC converter transformer according to claim 1, wherein: said first resistor is a fixed resistor having a resistance between 50 ohms and 5000 ohms.
3、 根据权利要求 1 所述的高压直流换流变压器， 其特征在 于： 所述第一电阻为可变电阻， 其阻值在 50欧姆至 5000欧姆之 间的一定范围内可调。 3. The high voltage DC converter transformer according to claim 1, wherein: said first resistor is a variable resistor, and said resistance is adjustable within a range of 50 ohms to 5000 ohms.
4、 一种高压直流换流变压器有载调压开关连接方法， 其特 征在于： 所述高压直流换流变压器的交流侧包括交流侧主线圏、 调压线圏、 切换开关、 第一开关和第二开关， 交流侧主线圏的一 端连接高电压， 另一端通过第一开关连接极性开关， 极性开关的 两个选择端分别连接调压线圏的正负两端， 调压线圏设置有多个 调压端口， 切换开关的一端与这些调压端口的其中一个连接， 另 一端接地； 第二开关的一端连接交流侧主线圏的低压端， 另一端 接地； 所述交流侧还包括第一电阻和第一选择开关， 第一电阻的 一端通过第一选择开关分别连接调压线圏的正负两端， 另一端接 地。 4. A method for connecting an on-load voltage regulating switch of a high-voltage DC converter transformer, characterized in that: the AC side of the high-voltage DC converter transformer comprises an AC side main line 调, a voltage regulating line 圏, a switch, a first switch, and a The second switch has one end connected to the high voltage on the main line of the AC side, and the other end is connected to the polarity switch through the first switch. The two selected ends of the polarity switch are respectively connected to the positive and negative ends of the voltage regulating line ,, and the voltage regulating line is provided with a plurality of voltage regulating ports, one end of the switch is connected to one of the voltage regulating ports, and the other end is grounded; one end of the second switch is connected to the low voltage end of the main line of the AC side, and the other end is grounded; the AC side further includes the first a resistor and a first selection switch, one end of the first resistor is respectively connected to the positive and negative ends of the voltage regulating line 通过 through the first selection switch, and the other end is connected Ground.
5、 根据权利要求 4 所述的高压直流换流变压器有载调压开 关连接方法， 其特征在于： 所述第一电阻的阻值在 50 欧姆至 5000欧姆之间。 The method of claim 4, wherein the resistance of the first resistor is between 50 ohms and 5000 ohms.
6、 一种高压直流换流变压器， 包括直流侧和交流侧， 其特 征在于： 所述交流侧包括交流侧主线圏、 调压线圏、 切换开关、 第一开关和第二开关， 交流侧主线圏的一端连接高电压， 另一端 通过第一开关连接极性开关， 极性开关的两个选择端分别连接调 压线圏的正负两端， 调压线圏设置有多个调压端口， 切换开关的 一端与这些调压端口的其中一个连接， 另一端接地； 第二开关的 一端连接交流侧主线圏的低压端， 另一端接地； 所述交流侧还包 括第二电阻、 第三电阻、 第三开关和第四开关， 第二电阻的一端 通过第三开关调压线圏的正极端， 另一端接地， 第三电阻的一端 通过第四开关调压线圏的负极端， 另一端接地。 6. A high-voltage DC converter transformer, comprising a DC side and an AC side, wherein: the AC side comprises an AC side main line, a voltage regulating line, a switch, a first switch and a second switch, and an AC side main line. One end of the crucible is connected to the high voltage, and the other end is connected to the polarity switch through the first switch. The two selected ends of the polarity switch are respectively connected to the positive and negative ends of the voltage regulating line ,, and the voltage regulating line 圏 is provided with a plurality of voltage regulating ports. One end of the switch is connected to one of the voltage regulating ports, and the other end is grounded; one end of the second switch is connected to the low voltage end of the main line of the AC side, and the other end is grounded; the AC side further includes a second resistor, a third resistor, The third switch and the fourth switch, one end of the second resistor is passed through the third switch to regulate the positive terminal of the wire ,, and the other end is grounded. One end of the third resistor is passed through the fourth switch to regulate the negative terminal of the wire ,, and the other end is grounded.
7、 根据权利要求 6 所述的高压直流换流变压器， 其特征在 于： 所述第三电阻和第四电阻为固定电阻， 其阻值在 50 欧姆至 5000欧姆之间。 7. The high voltage DC converter transformer according to claim 6, wherein: said third resistor and said fourth resistor are fixed resistors having a resistance between 50 ohms and 5000 ohms.
8、 根据权利要求 6或 7 所述的高压直流换流变压器， 其特 征在于： 所述第三电阻和第四电阻的阻值相同。 The high-voltage DC converter transformer according to claim 6 or 7, wherein the resistance values of the third resistor and the fourth resistor are the same.
9、 一种高压直流换流变压器有载调压开关连接方法， 其特 征在于： 所述高压直流换流变压器的交流侧包括交流侧主线圏、 调压线圏、 切换开关、 第一开关和第二开关， 交流侧主线圏的一 端连接高电压， 另一端通过第一开关连接极性开关， 极性开关的 两个选择端分别连接调压线圏的正负两端， 调压线圏设置有多个 调压端口， 切换开关的一端与这些调压端口的其中一个连接， 另 一端接地； 第二开关的一端连接交流侧主线圏的低压端， 另一端 接地； 所述交流侧还包括第二电阻、 第三电阻、 第三开关和第四 开关， 第二电阻的一端通过第三开关调压线圏的正极端， 另一端 接地， 第三电阻的一端通过第四开关调压线圏的负极端， 另一端 接地。 9. A method for connecting an on-load tap changer of a high-voltage DC converter transformer, characterized in that: the AC side of the high-voltage DC converter transformer comprises an AC side main line 调, a voltage regulating line 圏, a switch, a first switch, and a The second switch has one end connected to the high voltage on the main line of the AC side, and the other end is connected to the polarity switch through the first switch. The two selected ends of the polarity switch are respectively connected to the positive and negative ends of the voltage regulating line ,, and the voltage regulating line is provided with a plurality of voltage regulating ports, one end of the switch is connected to one of the voltage regulating ports, and the other end is grounded; one end of the second switch is connected to the low voltage end of the main line of the AC side, and the other end is grounded; the AC side further includes a second Resistance, third resistance, third switch, and fourth The switch, one end of the second resistor is passed through the third switch to regulate the positive terminal of the wire ,, and the other end is grounded. One end of the third resistor is passed through the fourth switch to regulate the negative terminal of the wire ,, and the other end is grounded.
10、 根据权利要求 9所述的高压直流换流变压器有载调压开 关连接方法， 其特征在于： 所述第三电阻和第四电阻的阻值相 同。 10. The method of claim 9, wherein the third resistor and the fourth resistor have the same resistance.
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| BR112013003072-0A BR112013003072B1 (en) | 2010-08-09 | 2011-08-02 | HIGH VOLTAGE CONTINUOUS CURRENT CONVERTER TRANSFORMER AND LOADING VARIABLE SWITCH CONNECTION PROCESS |
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| CN2010102483766A CN102013815B (en) | 2010-08-09 | 2010-08-09 | High-voltage DC converter transformer and connection method for on-load tap-changer thereof |
| CN201010248376.6 | 2010-08-09 |
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| WO2015044324A1 (en) * | 2013-09-26 | 2015-04-02 | Maschinenfabrik Reinhausen Gmbh | Switching arrangement with pre-selector |
| CN107196308A (en) * | 2017-07-04 | 2017-09-22 | 王佳宁 | 1000 kilovolts of main transformer regulating compensations become on-load voltage regulation and haul oneself willingly into cutting system and its pressure regulation method |
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|---|---|---|---|---|
| CN102013815B (en) * | 2010-08-09 | 2012-09-05 | 国家电网公司 | High-voltage DC converter transformer and connection method for on-load tap-changer thereof |
| CN102427238B (en) * | 2011-10-26 | 2013-12-18 | 中国南方电网有限责任公司超高压输电公司 | Method for adjusting gear signals of tap switch during parallel running of different converter transformers |
| DE102013110656A1 (en) * | 2013-09-26 | 2015-03-26 | Maschinenfabrik Reinhausen Gmbh | step switch |
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| CN102013815A (en) * | 2010-08-09 | 2011-04-13 | 国家电网公司 | High-voltage DC converter transformer and connection method for on-load tap-changer thereof |
| WO2011076309A1 (en) * | 2009-12-23 | 2011-06-30 | Maschinenfabrik Reinhausen Gmbh | Step switch comprising a polarity switch for a variable transformer |
-
2010
- 2010-08-09 CN CN2010102483766A patent/CN102013815B/en active Active
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2011
- 2011-08-02 BR BR112013003072-0A patent/BR112013003072B1/en active IP Right Grant
- 2011-08-02 WO PCT/CN2011/077912 patent/WO2012019514A1/en active Application Filing
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| US4207445A (en) * | 1976-10-29 | 1980-06-10 | Asea Aktiebolag | On-load tap changer switch assembly |
| JPS55133515A (en) * | 1979-04-06 | 1980-10-17 | Hitachi Ltd | Tap changing transformer |
| CN1610024A (en) * | 2004-10-18 | 2005-04-27 | 武汉大学 | Electric transformer dynamic combined voltage regulating on-load voltage regulating method and apparatus |
| CN1971778A (en) * | 2006-08-23 | 2007-05-30 | 特变电工沈阳变压器集团有限公司技术中心 | Single-phase self-coupling on-load voltage-regulating transformer |
| CN101430967A (en) * | 2008-08-21 | 2009-05-13 | 上海华明电力设备制造有限公司 | Thyristor resistor transition switching on-load tap-changer |
| WO2011076309A1 (en) * | 2009-12-23 | 2011-06-30 | Maschinenfabrik Reinhausen Gmbh | Step switch comprising a polarity switch for a variable transformer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015044324A1 (en) * | 2013-09-26 | 2015-04-02 | Maschinenfabrik Reinhausen Gmbh | Switching arrangement with pre-selector |
| DE102013110652B4 (en) * | 2013-09-26 | 2018-02-22 | Maschinenfabrik Reinhausen Gmbh | Switch arrangement with selection |
| US10153101B2 (en) | 2013-09-26 | 2018-12-11 | Maschinenfabrik Reinhausen Gmbh | Switching system with preselector |
| CN107196308A (en) * | 2017-07-04 | 2017-09-22 | 王佳宁 | 1000 kilovolts of main transformer regulating compensations become on-load voltage regulation and haul oneself willingly into cutting system and its pressure regulation method |
| CN107196308B (en) * | 2017-07-04 | 2023-08-18 | 河南送变电建设有限公司 | 1000 KV main transformer voltage regulation compensation variable on-load voltage regulation self-switching system and voltage regulation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102013815B (en) | 2012-09-05 |
| BR112013003072A2 (en) | 2016-07-05 |
| BR112013003072B1 (en) | 2020-11-17 |
| CN102013815A (en) | 2011-04-13 |
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