WO2010051727A1 - 500kV及特高压线路上的变压电抗器装置 - Google Patents

500kV及特高压线路上的变压电抗器装置 Download PDF

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Publication number
WO2010051727A1
WO2010051727A1 PCT/CN2009/074477 CN2009074477W WO2010051727A1 WO 2010051727 A1 WO2010051727 A1 WO 2010051727A1 CN 2009074477 W CN2009074477 W CN 2009074477W WO 2010051727 A1 WO2010051727 A1 WO 2010051727A1
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Prior art keywords
reactor
voltage
line
transformer
branch
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PCT/CN2009/074477
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English (en)
French (fr)
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李维亚
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Li Weiya
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Publication of WO2010051727A1 publication Critical patent/WO2010051727A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1828—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepwise control, the possibility of switching in or out the entire compensating arrangement not being considered as stepwise control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Definitions

  • the utility model relates to a variable piezoelectric reactor, in particular to a line transformer reactor of 500kV and UHV lines. Background technique
  • controllable high resistance compensates for many of the shortcomings of high line resistance, but because of its high cost and nearly three times the normal high resistance, this technology has not been promoted.
  • the high-voltage line variable-voltage reactor not only includes all the advantages of high line resistance and controllable high-resistance, but also can not only compensate for the under-compensation function, but also over-compensation function. It also has the advantages of high reliability and flexible operation. Since the line variable piezoelectric actuator can adjust the reactive power of the output according to the power factor of the power transmission and transformation equipment, it can substantially save energy and reduce consumption. Summary of the invention
  • the utility model provides a 500kV and UHV line transformer
  • the technical solution of the reactor has the characteristics of simple equipment, remarkable energy-saving and consumption-reducing effect and low production cost.
  • the high voltage line variable piezoelectric transformer includes an isolating switch and a circuit breaker, and is characterized in that: a 500 kV line is connected on the high voltage bus line, and a line is connected in series on the 500 kV line.
  • the side isolating switch, the 500kV line circuit breaker and the line side isolating switch are connected to the high voltage side isolating switch of the transformer on the 500kV line.
  • the other end of the high voltage side isolating switch of the transformer is connected with the 500kV transformer, and is connected at the neutral point of the high voltage winding of the 500kV transformer.
  • the 35kV reactor group is composed of multiple branches, each of which includes a 35kV branch reactor isolation switch, and each 35kV branch reactor A 35kV branch reactor breaker, 35kV branch reactor is connected in series on the isolating switch A road other end is coupled with a branch reactor 35kV disconnector, 35kV and 35kV branch Reactor Reactor branch isolation switch associated with the reactor branch 35kV neutral point connection branch end 35kV reactor.
  • the 35kV low voltage bus voltage is 35kV and below.
  • the high voltage bus and high voltage line voltages are all 500kV and above.
  • the 35kV reactor group is composed of at least two 35kV branch reactors.
  • the high voltage line variable piezoelectric device is provided with a relay protection and an automatic control system.
  • the utility model is invented to solve the problem of reactive power compensation and reactive excess of 500kV ultra-high voltage lines and ultra-high voltage lines.
  • the utility model utilizes a transformer of 500kV to 35kV to transfer the reactive power of the 35kV side low-voltage reactor group to the high-voltage side of 500kV.
  • the loadable neutral small reactor of the neutral point of the transformer can be grounded to compensate the potential supply current caused by the single-phase reclosing.
  • the control system controls the switching of the low-voltage reactor group on the 35kV side to make the UHV line
  • the reactive power compensation degree is controllable from under-compensation to over-compensation.
  • the under-compensation is limited to the line or the side of the busbar on the system side.
  • the over-compensation is limited to the maximum installation capacity of the low-voltage reactor and the minimum operating voltage of the system, and avoids the resonance point of the line, so that the line at the power transmission end can be
  • the generator and generator transformer and the step-down transformer on the power receiving end operate in real time under high power factor conditions to achieve energy saving and consumption reduction. This is one of its main advantages. Since the 500kV line variable voltage reactor is the same as the 500kV high resistance, only one isolation knife gate is needed to connect it to the line side, and the other low voltage isolation switch is connected to the 35kV low voltage bus side. Therefore, it does not require a 500kV circuit breaker and a 35kV low-voltage side circuit breaker, which is the second advantage.
  • the third advantage is that the manufacturing level and operational reliability of the 500kV transformer, 35kV circuit breaker and 35kV reactor are stronger than the 500kV high resistance.
  • the fourth advantage is that the 500kV line variable voltage reactor increases the regulation of the reactive power and voltage of the power system.
  • the fifth advantage is that the cost of the 500kV line variable voltage reactor is much lower than that of the 500kV line.
  • the utility model has the advantages of simple structure, reasonable design, low production cost, and can effectively solve the problem of excess reactive power generated by the 500 kV ultra-high voltage line and the ultra-high voltage line, and saves electric energy.
  • FIG 1 is an electrical schematic diagram of the present invention.
  • 500kV line 4 is connected to 500kV high voltage busbar 17, and line side isolating switch 1, 500kV line circuit breaker 2 and line side isolating switch 3 are connected in series on 500kV line, and 500kV transformer high voltage side isolating switch 5 is connected to 500kV line.
  • the other end of the transformer isolating switch is connected with the 500kV transformer 16, and the neutral point loaded variable tap small current reactor 7 is connected to the neutral point of the 500kV transformer high voltage winding, and the neutral tapped variable tap small current reactor is connected at the neutral point.
  • the low-voltage winding of the 500kV transformer is connected with a transformer 35kV side isolating switch 15, the other end of the transformer 35kV side isolating switch is connected with the 35kV low-voltage busbar 8, and a 35kV reactor group 10, 35kV reactance is connected to the 35kV low-voltage busbar.
  • the device group can be provided with multiple branches according to requirements. Each branch is separated by a 35kV branch reactor isolation switch 9, and a 35kV branch reactor isolation switch 9 is connected in series with a 35kV branch reactor breaker 14 and 35kV branch.
  • the other end of the circuit reactor circuit breaker is connected with a 35kV branch reactor isolation switch 13, the 35kV branch reactor 11 is connected with the 35kV branch reactor isolation switch 13, and the 35kV branch reactor 11 is provided with 3
  • the 5kV branch reactor has a neutral point connection terminal 12.
  • the high-voltage line variable piezoelectric reactor is provided with relay protection and automatic control system, and the relay electric protection and automatic control system is a common prior art.
  • the 35kV low voltage bus bar 8 voltage of the utility model has a voltage level of 35kV and below. Real Both the high voltage bus 17 and the high voltage line voltage described above include voltage levels of 500 kV and above.
  • the high voltage line variable piezoelectric reactor 16 of the present invention is provided with a relay protection and automatic control system, and the relay protection and automatic control system is prior art.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Description

500kV及特高压线路上的变压电抗器装置 技术领域
本实用新型涉及一种变压电抗器，具体是 500kV及特高压线路的线路变压 电抗器。 背景技术
随着我国西电东送战略的实施， 以及近年来电力行业的高速发展，特别是 超高压及特高压电网建设发展,建成或正在建设的一大批超高压和特高压输配 电网， 使我国西部地区的能源得以不断地向东部地区输送。 我们知道， 超高压 和特高压输电线，由于对地电容的原因，在运行时会产生大量的容性无功功率， 这就需要在线路两侧加装高压电抗器简称 "高抗"进行补偿。 通常情况下， 为 避免发生谐振， 高抗对线路充电功率的补偿釆用固定容量的 "欠补偿"。 由于 该补偿方式欠缺灵活性和经济性，并且造成电网在小方式下大量无功过剩。 因 此， 近年来出现了一种称为 "可控高抗" 的电抗器。 可控高抗弥补了线路高抗 的许多不足， 但是由于其造价昂贵， 是普通高抗的近 3倍， 因此该技术一直得 不到推广。 高压线路变压电抗器不仅仅包括了线路高抗和可控高抗的所有优 点， 而且不但能起到欠补偿功能， 也能起到过补偿功能。 它还具有可靠性高, 运行灵活的优点。由于线路变压电抗器可根据输变电设备的功率因数来调节其 输出的无功功率， 因此， 它能实质性的起到节能降耗的作用。 发明内容
为了克服现有技术的不足,本实用新型提供一种 500kV及特高压线路变压 电抗器的技术方案，按本实用新型制作的设备具有设备简单、节能降耗效果显 著及制作成本低等特点。
本实用新型解决其技术问题所釆用的技术方案是： 高压线路变压电抗器, 包括有隔离开关、 断路器， 其特征在于： 在高压母线上联接有 500kV线路， 在 500kV线路上串联有线路侧隔离开关、 500kV线路断路器及线路侧隔离开关， 在 500kV线路上联接有变压器高压侧隔离开关，变压器高压侧隔离开关的另端 与 500kV变压器联接，在 500kV变压器高压绕组中性点上联接有中性点有载可 变抽头的小电流电抗器， 在中性点有载可变抽头小电流电抗器上设有接地端， 500kV变压器的低压绕组联接有 35kV变压器隔离开关， 35kV变压器隔离开关 另端与 35kV低压母线联接， 在 35kV低压母线上联接有 35kV电抗器组， 35kV 电抗器组由多个分支组成，每一个分支均包括一个 35kV支路电抗器隔离开关， 每个 35kV支路电抗器隔离开关上均串联有一个 35kV支路电抗器断路器， 35kV 支路电抗器断路器另端联接有 35kV支路电抗器隔离开关， 35kV支路电抗器与 35kV支路电抗器隔离开关相联， 35kV支路电抗器上设有 35kV支路电抗器中性 点连接端。
所述的 35kV低压母线电压为 35kV及以下电压等级。所述的高压母线及高 压线路电压均为 500kV及以上电压等级。
所述的 35kV电抗器组是由至少两个 35kV分支电抗器组成。
所述的高压线路变压电抗器设有继电保护及自动控制系统。
本实用新型是为了解决 500kV超高压线路及特高压线路的无功补偿和产 生的无功过剩问题而发明。本实用新型是利用 500kV变 35kV的变压器，将 35kV 侧低压电抗器组的无功功率传送到 500kV高压侧。同时可利用变压器中性点的 有载可变抽头小电抗器接地，来补偿线路由于单相重合闸引起的潜供电流。在 补偿了超高压或特高压线路的潜供电流后，根据 500kV线路变压电抗器安装点 的系统无功功率和电压， 通过控制系统控制 35kV侧的低压电抗器组的投切， 使超高压线路的无功功率补偿度从欠补偿到过补偿进行可控补偿。欠补偿以线 路或系统侧母线端不产生过电压为限，过补偿以低压电抗器的最大安装容量以 及系统最低运行电压为限，并且避开线路的谐振点，从而可以使送电端的线路、 发电机及发变组的变压器，以及受电端的降压变压器实时处在高功率因数工况 下运行， 以达到节能降耗的目的， 这是它的最主要的优点之一。 由于 500kV 线路变压电抗器与 500kV 高抗一样仅仅只需要一台隔离刀闸将其连接于线路 侧， 另一台低压隔离开关连接于 35kV低压母线侧。 因此它不需要 500kV断路 器和 35kV低压侧断路器，这是它的优点之二。优点之三是 500kV变压器， 35kV 断路器， 35kV电抗器的制造水平和运行可靠性统计都强于 500kV高抗。 优点 之四， 500kV线路变压电抗器增加了对电力系统无功和电压的调节手段。 优点 之五， 500kV线路变压电抗器的造价远低于 500kV线路可控高抗。
本实用新型具有结构简单、 设计合理、 制作成本较低、 能有效解决 500kV 超高压线路及特高压线路产生的无功过剩问题， 节约电能等特点。 附图说明
图 1是本实用新型的电气原理图。
图中：
1 -线路侧隔离开关 2 - 500kV线路断路器
3 -线路侧隔离开关 4 - 500kV线路
5 - 500kV侧变压器高压隔离开关
6 -中性点有载可变抽头小电流电抗器接地端 7-中性点小电流电抗器 8 _ 35kV低压母线
9- 35kV支路电抗器隔离开关 10- 35kV电抗器组
ll - 35kV支路电抗器 12 - 35kV支路电抗器中性点连接端 13- 35kV支路电抗器隔离开关 14- 35kV支路电抗器断路器
15- 35kV变压器隔离开关 16 - 500kV变压器
17 - 500kV高压母线
虛线框内为 500kV及特高压线路 压电抗器 具体实施方式
在 500kV高压母线 17上联接有 500kV线路 4, 在 500kV线路上串联有线 路侧隔离开关 1、 500kV线路断路器 2及线路侧隔离开关 3, 在 500kV线路上 联接有 500kV变压器高压侧隔离开关 5, 变压器隔离开关的另端与 500kV变压 器 16联接， 在 500kV变压器高压绕组中性点上联接有中性点有载可变抽头小 电流电抗器 7, 在中性点有载可变抽头小电流电抗器上设有接地端 6, 500kV 变压器的低压绕组联接有变压器 35kV侧隔离开关 15, 变压器 35kV侧隔离开 关另端与 35kV低压母线 8联接，在 35kV低压母线上联接有 35kV电抗器组 10, 35kV电抗器组可根据需要设多个分支，每一个分支均由一个 35kV支路电抗器 隔离开关 9, 一个 35kV支路电抗器隔离开关 9上均串联有一个 35kV支路电抗 器断路器 14, 35kV支路电抗器断路器另端联接有 35kV支路电抗器隔离开关 13, 35kV支路电抗器 11与 35kV支路电抗器隔离开关 13相联， 35kV支路电抗 器 11上设有 35kV支路电抗器中性点连接端 12。 其中高压线路变压电抗器中 设有继电保护及自动控制系统，其中继电保护及自动控制系统为通用的现有技 术。 本实用新型所述的 35kV低压母线 8电压为 35kV及以下电压等级。 本实 用新型所述的高压母线 17及高压线路电压均包括 500kV及以上电压等级。 本 实用新型的高压线路变压电抗器 16设有继电保护及自动控制系统， 继电保护 及自动控制系统为现有技术。

Claims

权利要求
1、 500kV及特高压线路变压电抗器， 包括有隔离开关、 断路器， 其特征在 于： 在高压母线（ 17 )上联接有 500kV线路（ 4 ), 在 500kV线路上串联有线路 侧隔离开关 （1)、 500kV 线路断路器 （2 )及线路侧隔离开关 （3 ), 在 500kV 线路上联接有变压器高压侧隔离开关 （5 ), 变压器高压侧隔离开关的另端与 500kV变压器（ 16 )联接， 在 500kV变压器高压绕组中性点上联接有中性点有 载可变抽头的小电流电抗器（7 ),在中性点有载可变抽头小电流电抗器上设有 接地端（ 6 ), 500kV变压器的低压绕组联接有 35kV变压器隔离开关（15 ), 35kV 变压器隔离开关另端与 35kV低压母线 （8 )联接， 在 35kV低压母线上联接有 35kV电抗器组（10), 35kV电抗器组由多个分支组成， 每一个分支均包括一个 35kV支路电抗器隔离开关 （9 ), 每个 35kV支路电抗器隔离开关 （9 )上均串 联有一个 35kV支路电抗器断路器（ 14 ), 35kV支路电抗器断路器另端联接有 35kV支路电抗器隔离开关 （13 ), 35kV支路电抗器（11 ) 与 35kV支路电抗器 隔离开关（ 13 )相联， 35kV支路电抗器（ 11 )上设有 35kV支路电抗器中性点 连接端（12)。
2、 根据权利要求 1所述的 500kV及特高压线路变压电抗器， 其特征在于， 所述的 35kV低压母线 （8 ) 电压为 35kV及以下电压等级。
3、 根据权利要求 1所述的 500kV及特高压线路变压电抗器， 其特征在于， 所述的高压母线 （17 )及高压线路电压均为 500kV及以上电压等级。
4、 根据权利要求 1所述的 500kV及特高压线路变压电抗器， 其特征在于， 35kV电抗器组是由至少两个 35kV分支电抗器组成。
5、 根据权利要求 1所述的 500kV及特高压线路变压电抗器， 其特征在于，
PCT/CN2009/074477 2008-11-10 2009-10-16 500kV及特高压线路上的变压电抗器装置 WO2010051727A1 (zh)

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CN101227083A (zh) * 2007-11-16 2008-07-23 福建工程学院 防止高压输电线单相重合于永久性故障的方法

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CN102214926A (zh) * 2011-05-04 2011-10-12 上海艾能电力工程有限公司 节能交流电力系统
CN108092282A (zh) * 2018-01-02 2018-05-29 日新电机（无锡）有限公司 一体式紧凑型高压并联电抗器成套装置

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