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WO2013026253A1 - 全过程利用倒闸操作实施的输电线路融冰系统及其方法 - Google Patents

全过程利用倒闸操作实施的输电线路融冰系统及其方法 Download PDF

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Publication number
WO2013026253A1
WO2013026253A1 PCT/CN2012/000740 CN2012000740W WO2013026253A1 WO 2013026253 A1 WO2013026253 A1 WO 2013026253A1 CN 2012000740 W CN2012000740 W CN 2012000740W WO 2013026253 A1 WO2013026253 A1 WO 2013026253A1
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WO
WIPO (PCT)
Prior art keywords
ice
melting
transmission line
knife
knife gate
Prior art date
Application number
PCT/CN2012/000740
Other languages
English (en)
French (fr)
Inventor
傅闯
吴怡敏
饶宏
许树楷
黎小林
Original Assignee
南方电网科学研究院有限责任公司
中国电力顾问工程集团西南电力设计院
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Application filed by 南方电网科学研究院有限责任公司, 中国电力顾问工程集团西南电力设计院 filed Critical 南方电网科学研究院有限责任公司
Publication of WO2013026253A1 publication Critical patent/WO2013026253A1/zh

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00Overhead installations of electric lines or cables
    • H02G7/16Devices for removing snow or ice from lines or cables

Definitions

  • the invention patent relates to a transmission line ice melting system and a method thereof implemented by using a switching operation in the whole process, and belongs to an innovative technology of DC melting application of a transmission line transmission line. Background technique
  • connection (or isolation) of the ice-melting busbar on the DC side of the DC ice-melting device to the ice-melting bus line and the short-circuit (or isolation) of the ice-melting line are generally achieved manually.
  • the operator connects the busbar busbar to the line using tools and temporary shorting wires in the substation where the ice melting device is located, and then uses the temporary three-phase line as required in the opposite substation of the ice-melting line.
  • Wiring is short-circuited, and the line must be switched to the inspection state during the connection and removal process, because the line hanging point is often higher than the ground, especially for the 500kV line, the line hanging point height Generally, it is more than 20 meters. In manual operation, it is not only time-consuming, but also has great work intensity and difficulty. According to the actual application experience of the site in 2009-211, the manual wiring time is greater than the actual melting time of the line, causing the line outage time to exceed the line melting time by more than twice, and the time required to complete a 500kV line melting ice exceeds 10 hours. The efficiency of melting ice is seriously affected.
  • connection between the melting ice bus and the ice melting line on the DC side of the existing DC ice melting device and the manual temporary field connection of the opposite side of the ice melting line have the disadvantages of long line outage time, high risk and poor reliability. Therefore, it is necessary to better solve the problem of connecting and isolating the ice melting circuit and the DC ice melting device, and shorten the connection and isolation time.
  • the transmission line ice melting system and the method implemented by the switching operation in the whole process of the invention can solve the problem better, and the total melting time of a 500 kV line can be controlled within 4 hours. Summary of the invention
  • the object of the present invention is to provide a transmission line ice melting system which is implemented by using a switching operation in the whole process of the existing DC ice melting system and method, and does not need to convert the transmission line and the DC ice melting device into maintenance during the ice melting process. State, the system does not require manual temporary wiring during the implementation of the melting line of the transmission line.
  • the facilities and equipment required for the present invention mainly include a DC ice melting device, a conversion knife gate, a melting ice accessing knife gate connected to the ice melting circuit, a melting ice shorting knife gate, a connecting wire and a fitting.
  • the invention has reasonable design, convenience and practicality.
  • Another object of the present invention is to provide a DC ice melting method for a transmission line that is simple in operation and convenient to use.
  • the technical solution of the present invention is: the transmission line melting ice system implemented by the switching operation in the whole process of the invention, including the DC ice melting device DI, the DC side switching knife gates S1, S2, S3 and S4, the melting ice bus DB, melting Ice access to the knife gate SA, the ice melting transmission line TL, the ice melting short circuit breaker SC, and the DC ice melting device DI and the circuit breaker QF connected to the busbar in the substation of the substation, the isolation knife gate K, the transmission line TL
  • the circuit breaker QFA connected to the AC busbar of the station, the isolation knife gate KA, the circuit breaker QFB connected to the corresponding AC bus of the substation Q station, the isolation knife gate KB, the one end of the DC converter switch gates SI and S2 are short.
  • the short-circuiting of the DC-side switching knife S3 and S4-end is connected with the positive pole of the DC ice-melting device DI; the other end of the DC-side switching knife gate S1 and the melting ice bus DB
  • the other ends of the DC side switching knife gates S2 and S3 are shorted and connected to the B in the melting ice bus DB, and the other end of the DC side switching knife gate S4 is connected to the C in the melting ice bus DB;
  • the low pressure side of the ice access knife gate SA is connected to the ice melting bus bar DB, and the high pressure side of the ice melting access knife gate SA is connected with the power transmission line TL; the low voltage side of the ice shorting knife gate SC is shorted, and the ice melting short circuit knife
  • the high voltage side of the gate SC is connected to the power transmission line TL.
  • connection and isolation of the above-mentioned transmission line TL and the DC ice melting device DI are realized by the ice-impregnating knife gate SA and the melting ice shorting knife gate SC.
  • the midpoint of the two bridges is the only grounding point of the DC ice-melting system.
  • the DC ice-melting system is not connected. location.
  • the above-mentioned melting ice accessing knife gate SA and the melting ice shorting knife gate SC are composed of three single-column one-arm vertical telescopic isolation knife gates or single-column double-arm vertical telescopic isolation knife gates.
  • the low-pressure end of the three vertical telescopic knife gates in the above-mentioned ice-melting short-circuiting knife gate is short-circuited, and the low-pressure end of the three vertical telescopic knife gates in the ice-impregnated knife gate SA is not short-circuited.
  • the vertical telescopic knife gate used in the above-mentioned ice-impacting knife gate SA and the ice-melting short-circuit knife gate includes a high-voltage supporting insulating porcelain bottle, a low-voltage supporting insulating porcelain bottle, an operating insulating porcelain bottle, a vertically-opening main knife gate, a static contact, and a dynamic touch.
  • the high-voltage terminal block is installed, the bottom surface of the equalizing ring is also fixedly mounted with a static contact, and the static contact, the high-voltage terminal block and the equalizing ring are electrically connected;
  • the low-voltage supporting insulating porcelain bottle and the operating porcelain bottle are of the same height and mutual Parallel and connected to the upper end; the top end of the low-voltage support insulating porcelain bottle is fixedly connected with the low-voltage terminal block and the vertical open type main knife, and the low-voltage terminal board is electrically conductively fixedly connected with the lower end of the vertical open main-knife.
  • the top of the vertical open main knife gate and the movable contact are electrically conductively fixedly connected; the main knife gate electric operating mechanism and the vertical opening
  • the main knife gates are connected by operating the porcelain bottle drive; the length of the vertically open main knife gate is extended to make the movable contact contact with the static contact, and the vertical open main knife gate is not extended when the movable contact and the static contact The distance between them meets the moving contact
  • the level of insulation between the static contact and the static contact is the same as the insulation level of the power switchgear required for the melting line voltage level.
  • the insulation level of the low-voltage support insulating porcelain bottle and the operating insulating porcelain bottle of the above-mentioned ice-melting inlet knife and the ice-shrinking knife are the same.
  • the insulation level of the high-voltage supporting insulating porcelain bottle is much higher than that of the low-voltage supporting insulating porcelain bottle and the operating insulating porcelain bottle. Level.
  • the length of the high-voltage supporting insulating porcelain bottle satisfies the same level of insulation required for the high-voltage supporting insulating porcelain bottle and the grounding insulation TL voltage level; the length of the low-voltage supporting insulating porcelain bottle and the operating insulating porcelain bottle satisfy the insulation level and the direct current melting
  • the level of insulation required for ground is the same as that required for the ice voltage of the ice device.
  • the low-voltage terminal block of the three vertical telescopic knife gates in the above-mentioned ice-melting short-circuiting knife gate SC is connected to the busbar and the connection.
  • the ice melting method of the transmission line ice melting system implemented by the switching operation in the whole process of the invention comprises the following steps:
  • P station closes the transmission line TL and the DC ice-melting device DI connected to the ice-melting access knife gate SA, Q station closes the ice-melting short-circuiting knife gate SC connected to the transmission line, that is, the transmission line TL exits the cold standby state , entering the state of melting ice;
  • the P station disconnects the transmission line TL and the ice melting device DI is connected to the ice-melting knife gate SA, and the Q station disconnects the melting ice shorting knife gate SC connected to the transmission line TL, that is, the transmission line TL exits the melting ice State, enter the cold standby state;
  • the invention has the following characteristics:
  • the invention is convenient to operate, no manual field wiring is needed, no tools are needed, manpower and material resources are saved, and personal injury may be avoided at the time of manual wiring.
  • the invention greatly shortens the line outage time when melting ice, and the method in the present invention can
  • the total melting time of the 500kV line is controlled within 4 hours. Through the operation of the closing operation, the access and disconnection of the ice melting device is completed, and there is no transfer repair time on the line, which greatly improves the melting efficiency.
  • the invention has high reliability. Manual temporary wiring may result in unreliable access reliability due to unreasonable operation, which makes the melting of ice impossible.
  • the automatic access is achieved by this scheme, and the reliability is greatly improved.
  • the main equipment used in the ice-melting method of the present invention is a set of ice-melting accessing knife gates and a set of ice-melting short-circuiting knife gates, and three single-column one-arm vertical telescopic isolating knife gates or The single-column double-arm vertical telescopic isolating knife gate is realized, and the land occupation is small.
  • FIG. 1 is a schematic view of a transmission line ice melting system implemented by a switching operation in the whole process
  • FIG. 2 is a front view of a single column single arm vertical telescopic isolating knife
  • FIG. 3 is a single column single arm vertical telescopic
  • FIG. 4 is a front view of a single-column double vertical telescopic isolating knife gate
  • FIG. 5 is a side view of a single-column double vertical telescopic isolating knife gate
  • the connecting gate adopts three single-column single-arm vertical telescopic isolation knife gates on the low-voltage side short-circuit diagram;
  • Figure 7 is a schematic diagram of the short-circuiting of the low-pressure side of the three-column vertical telescopic isolating knife gate for the ice-shrinking short-circuit knife gate;
  • Figure 8 is a schematic view showing the ice melting method of the transmission line ice melting system implemented by the switching operation in the whole process of the present invention.
  • the whole process of the invention utilizes the transmission line melting system implemented by the switching operation, including the DC ice melting device DI, the DC side switching knife gates S1, S2, S3 and S4, the melting ice bus bar DB, and the melting ice accessing the knife gate SA.
  • the low-pressure side of the melting ice is connected to the knife gate SA.
  • Ice busbar DB connection melting ice into the high pressure of the knife gate SA Connected to the transmission line TL; ice-melting low-side short knife shorting SC, SC melting ice short knife pressure side is connected to the transmission line TL.
  • the connection and isolation of the above-mentioned transmission line TL and the DC ice-melting device DI are realized by the ice-melting access knife gate SA and the ice-melting short-circuiting knife gate SC.
  • the midpoint of the two bridges is the only grounding point of the DC ice-melting system.
  • the DC ice-melting system is not connected. location.
  • the above-mentioned melting ice accessing knife gate SA and the melting ice shorting knife gate SC are composed of three single-column one-arm vertical telescopic isolation knife gates or single-column double-arm vertical telescopic isolation knife gates.
  • the low-voltage end of the three vertical telescopic knife gates in the above-mentioned ice-melting short-circuit knife gate is short-circuited, and the low-voltage terminals of the three vertical telescopic knife gates in the ice-impregnated knife gate SA are not short-circuited.
  • the vertical telescopic knife switch used for the above-mentioned ice-melting access knife gate SA and the ice-melting short-circuit knife gate includes a high-voltage supporting insulating porcelain bottle 1, a low-voltage supporting insulating porcelain bottle 2, an operating insulating porcelain bottle 3, a vertically-opening main knife gate 4, and a static touch.
  • the head 5, the moving contact 6, the equalizing ring 7, the high voltage terminal block 8, the low voltage terminal board 9, the main knife electric operating mechanism 10; the top end of the high voltage supporting insulating porcelain bottle 1 and the bottom surface of the equalizing ring 7 are fixedly conductive
  • the top surface of the high-voltage supporting insulating porcelain bottle 1 is fixedly mounted with a high-voltage terminal block 8
  • the bottom surface of the equalizing ring 7 is also fixedly mounted with a static contact 5, and the static contact 5, the high-voltage terminal block 8 and the pressure equalization
  • the ring 7 is electrically connected;
  • the low-voltage supporting insulating porcelain bottle 2 is equal to the operating porcelain bottle 3, parallel to each other and connected to the upper end; the low-voltage supporting insulating porcelain bottle 2 is fixedly connected with the low-voltage terminal block 9 and the vertical open main switch 4.
  • the low-voltage terminal block 9 and the lower end of the vertical open main switch 4 are electrically conductively fixedly connected, and the top end of the vertical open main switch 4 and the movable contact 6 are guided.
  • the fixed connection; the main knife electric operation mechanism 10 and the vertical opening main switch 4 are connected by the operation of the porcelain bottle 3; the length of the vertical open main switch 4 after extension can make the movable contact 6 and the static contact 5 contact,
  • the vertical open main switch 4 is not extended, the distance between the movable contact 6 and the static contact 5 satisfies the insulation level between the movable contact 6 and the static contact 5 and the power switch required by the voltage level of the ice melting line
  • the insulation level of the equipment break is the same.
  • the low-voltage supporting insulating porcelain bottle 2 and the operating insulating porcelain bottle 3 of the above-mentioned ice-melting access knife gate SA and the ice-melting short-circuiting knife gate SC have the same insulation level, and the insulation level of the high-voltage supporting insulating porcelain bottle 1 is much higher than that of the low-voltage support.
  • the length of the high-voltage supporting insulating porcelain bottle 1 satisfies the insulation level of the high-voltage supporting insulating porcelain bottle 1 and the grounding insulation level required for the melting line TL voltage level; the length of the low-voltage supporting insulating porcelain bottle 2 and the operating insulating porcelain bottle 3 satisfy the insulation thereof
  • the level of insulation required for the horizontal and the DC ice melting device melting ice bus DB voltage level is the same.
  • the low-voltage terminal block 9 of the three vertical telescopic knife gates in the above-mentioned ice-melting short-circuiting knife gate SC is connected by connecting the bus bars 11 and 12.
  • the ice melting method of the transmission line ice melting system implemented by the switching operation in the whole process of the invention comprises the following steps:
  • P station closes the transmission line TL and the DC ice-melting device DI connected to the ice-melting access knife gate SA, Q station closes the ice-melting short-circuiting knife gate SC connected to the transmission line, that is, the transmission line TL exits the cold standby state , entering the state of melting ice;
  • DC ice-melting device starts the ice-melting mode switching logic after DI lock, disconnects the DC-side switching knife switch S3, closes the DC-side switching knife gates S2 and S4, so that Sl, S2 and S4 are closed, S3 is disconnected, enter
  • the P station disconnects the transmission line TL and the ice melting device DI is connected to the ice-melting knife gate SA, and the Q station disconnects the melting ice shorting knife gate SC connected to the transmission line TL, that is, the transmission line TL exits the melting ice State, enter the cold standby state;

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Abstract

一种全过程利用倒闸操作实施的输电线路融冰系统及其方法。该融冰系统包括直流融冰装置、转换刀闸、与融冰线路连接的融冰接入刀闸和融冰短接刀闸、连接导线及金具。对输电线路实现短路融冰时,在直流融冰装置所在变电站站内通过融冰接入刀间对融冰线路与融冰母线连接,在线路对侧变电站内通过融冰短接刀间将该回线路三相短接,使得输电线路进入融冰状态。通过该融冰系统及方法,可在融冰时不需要将线路转为检修状态,仅通过倒闸操作即可完成连接、短接和撤除的操作过程。改进了通过人工方式现场操作所带来的线路停运时间长、可靠性低以及接线工人人身安全受到威胁等缺陷。该融冰系统中的融冰接入刀闸和融冰短接刀闸占地体积小,特别适用于已建变电站,具备很好的实施性。

Description

全过程利用倒闸操作实施的输电线路融冰系统及其方法 技术领域
本发明专利涉及了全过程利用倒闸操作实施的输电线路融冰系统及其方 法, 属于输电网输电线路直流融冰应用的创新技术。 背景技术
低温雨雪冰冻天气引起的输电线路覆冰是众多国家电力系统所面临的严 重威胁之一, 严重的覆冰会引起电网断线、 倒塔, 导致大面积停电事故, 也使 得快速恢复送电变得非常困难。长期以来, 冰灾的威胁一直是电力系统工业界 竭力应对的一大技术难题。
1998年北美风暴给美加电网带来了严重的影响,造成了范围广阔的电力中 断。 2005年,低温雨雪冰冻天气曾给中国华中、华北电网造成严重的灾害。 2008 年 1月至 2月, 低温雨雪冰冻天气再次袭击中国南方、 华中、 华东地区, 导致 贵州、 湖南、 广东、 云南、 广西和江西等省输电线路大面积、 长时间停运, 给 国民经济和人民生活造成巨大损失。
2008年冰灾后,中国电力科技工作者自主进行了直流融冰技术及装置的研 发, 成功研发出了具有完全自主知识产权的大功率直流融冰装置, 主要包括带 专用整流变压器、不带专用整流变压器和车载移动式等多种型式, 进而在全国 进行了推广应用。 2009年 -2011年冰期, 仅南方电网内已经安装的 19套直流 融冰装置均发挥了重大作用,对 UOkV以上线路进行直流融冰共计 234次,其 中 500kV交流线路 40余次, 充分发挥了直流融冰装置的威力。 从目前直流融冰装置在电网中的应用来看,直流融冰装置直流侧的融冰母 线与融冰线路的连接 (或隔离)、 融冰线路短接 (或隔离) 一般通过人工方式 实现, 在融冰时, 操作工人在融冰装置所在变电站内现场利用工具和临时短接 线将融冰管母线与线路连接,然后在待融冰线路对侧变电站将线路按要求将三 相线路利用临时短接线短接,连接和拆除过程中必须将线路转为检修状态才能 进行, 由于线路挂点往往离地面较高,特别是对于 500kV线路, 线路挂点高度 一般在 20米以上, 在人工操作时, 不但耗时, 且作业强度和难度很大。 根据 目前 2009-211年现场实际应用经验, 人工接线时间要大于线路实际融冰时间, 造成线路停运时间超过线路融冰时间两倍以上,完成一条 500kV线路融冰需要 的时间超过 10个小时, 融冰效率受到严重影响。 现有直流融冰装置直流侧的 融冰母线与融冰线路的连接以及融冰线路对侧短接采用人工临时现场连接方 式, 存在线路停运时间长, 危险性高, 可靠性差等缺点。 因此, 必须有更好的 解决融冰线路与直流融冰装置连接和隔离的问题, 缩短连接和隔离时间。本发 明所提出全过程利用倒闸操作实施的输电线路融冰系统及其方法能够较好的 解决这一问题, 可将一条 500kV线路总融冰时间控制在 4小时内。 发明内容
本发明的目的是针对现有直流融冰系统及方法的不足,提供全过程利用倒 闸操作实施的输电线路融冰系统,实施融冰过程中不需要将输电线路和直流融 冰装置转为检修状态, 该系统在实施输电线路融冰过程中不需要人工临时接 线。 本发明需要用到的设施和设备主要包括直流融冰装置、 转换刀闸、 与融冰 线路连接的融冰接入刀闸和融冰短接刀闸、连接导线及金具。本发明设计合理, 方便实用。
本发明的另一目的在于提供一种操作简单,使用方便的输电线路直流融冰 方法。
本发明的技术方案是:本发明的全过程利用倒闸操作实施的输电线路融冰 系统,包括直流融冰装置 DI,直流侧转换刀闸 Sl、 S2、 S3和 S4,融冰母线 DB, 融冰接入刀闸 SA, 需要融冰输电线路 TL, 融冰短接刀闸 SC, 以及直流融冰装 置 DI与及其所在变电站 P站内母线连接的断路器 QF、 隔离刀闸 K, 输电线路 TL与 Ρ站交流母线连接的断路器 QFA、 隔离刀闸 KA, 输电线路 TL与另一变电 站 Q站相应交流母线连接的断路器 QFB、 隔离刀闸 KB, 直流恻转换刀闸 SI和 S2的一端短接后与直流融冰装置 DI负极相连, 直流侧转换刀闸 S3和 S4—端 短接后与直流融冰装置 DI正极相连;直流侧转换刀闸 S1另一端与融冰母线 DB 中的 A相连接, 直流侧转换刀闸 S2和 S3另一端短接后与融冰母线 DB中的 B 相连接, 直流侧转换刀闸 S4另一端与融冰母线 DB中的 C相连接; 融冰接入刀 闸 SA的低压侧与融冰母线 DB连接, 融冰接入刀闸 SA的高压侧与输电线路 TL 连接; 融冰短接刀闸 SC的低压侧短接, 融冰短接刀闸 SC的高压侧与输电线路 TL连接。
上述输电线路 TL与直流融冰装置 DI的连接和隔离通过融冰接入刀闸 SA 和融冰短接刀闸 SC实现。
上述直流融冰装置 DI采用两个六脉动桥串联结构时两桥中点为直流融冰 系统的唯一接地点,采用单个六脉动桥或用两个六脉动桥并联结构时直流融冰 系统无接地点。
上述融冰接入刀闸 SA和融冰短接刀闸 SC采用三个单柱单臂垂直伸缩式隔 离刀闸或单柱双臂垂直伸縮式隔离刀闸构成。
上述融冰短接刀闸 SC中三个垂直伸縮式刀闸的低压端短接, 融冰接入刀 闸 SA中的三个垂直伸缩式刀闸的低压端不短接。
上述融冰接入刀闸 SA和融冰短接刀闸 SC采用的垂直伸缩式刀闸包括高压 支持绝缘瓷瓶、 低压支持绝缘瓷瓶、 操作绝缘瓷瓶、 垂直开启式主刀闸、 静触 头、 动触头、 均压环、 高压接线端子板、 低压接线端子板、 主刀闸电动操作机 构; 所述高压支持绝缘瓷瓶的顶端与均压环的底面固定导电连接; 所述高压支 持绝缘瓷瓶的顶面固定安装有高压接线端子板,均压环的底面还固定安装有静 触头, 且静触头、 高压接线端子板及均压环之间为导电连接; 低压支持绝缘瓷 瓶与操作瓷瓶等高、相互平行且上端相连; 所述低压支持绝缘瓷瓶顶端固定连 接有所述低压接线端子板与垂直开启式主刀间,低压接线端子板与所述的垂直 开启式主刀闸下端之间为可导电固定连接,垂直开启式主刀闸顶端与所述动触 头之间为可导电固定连接;主刀闸电动操作机构与垂直开启式主刀闸之间通过 操作瓷瓶传动连接;所述垂直开启式主刀闸伸展后的长度能使动触头与静触头 接触,所述垂直开启式主刀闸未伸展时动触头与静触头之间的距离满足动触头 与静触头之间的绝缘水平与融冰线路电压等级所要求的电力开关设备断口的 绝缘水平相同。
上述融冰接入刀闹 SA和融冰短接刀间 SC的低压支持绝缘瓷瓶和操作绝缘 瓷瓶的绝缘水平相同,高压支持绝缘瓷瓶的绝缘水平远高于低压支持绝缘瓷瓶 和操作绝缘瓷瓶的绝缘水平。
上述高压支持绝缘瓷瓶的长度满足高压支持绝缘瓷瓶的绝缘水平与融冰 线路 TL电压等级所要求的对地绝缘水平相同; 所述低压支持绝缘瓷瓶和操作 绝缘瓷瓶的长度满足其绝缘水平与直流融冰装置融冰母线 DB电压等级所要求 的对地绝缘水平相同。
上述融冰短接刀闸 SC中的三个垂直伸缩式刀闸的低压接线端子板通过连 接母排和连接。
本发明全过程利用倒闸操作实施的输电线路融冰系统的融冰方法,包括如 下步骤:
1 ) 将需要融冰的输电线路 TL转换为热备用状态, 即 P站断开输电线路 TL与 P站母线连接的断路器 QFA, 断开与 B站相应母线连接的断路器 QFB;
2 ) 将需要融冰的输电线路 TL转换为冷备用状态, 即 P站断开输电线路 TL与 P站母线连接的隔离刀闸 KA,断开与 B站相应母线连接的隔离刀闸 KB;
3 ) P站合上输电线路 TL与直流融冰装置 DI连接的融冰接入刀闸 SA, Q 站合上与输电线路连接的融冰短接刀闸 SC, 即输电线路 TL退出冷备用状态, 进入融冰状态;
4) 合上直流侧转换刀闸 S1和 S3, 确认 S2和 S4断开;
5 ) 合上直流融冰装置 DI交流侧隔离刀闸 K和断路器 QF;
6)启动直流融冰装置 DI, 将直流电流升至输电线路 TL的设计融冰电流, 等候 A和 B相导线覆冰脱落, 即采用 "一去一回"直流融冰模式实现 A和 B相 导线串联融冰, 完成 A和 B相线路融冰后闭锁直流融冰装置 DI;
7)直流融冰装置 DI闭锁后启动融冰模式切换逻辑, 断开直流侧转换刀闸 S3, 闭合直流侧转换刀闸 S2和 S4, 即使得 Sl、 S2和 S4闭合, S3断开, 进入 "二去一回"直流融冰模式, 即 A和 B相导线并联后再与 C相导线串联;
8)启动直流融冰装置 DI, 将直流电流升至输电线路 TL的设计融冰电流, 等候 C相导线覆冰脱落, 完成 C相导线融冰后闭锁直流融冰装置 DI;
9) 断开直流融冰装置 DI交流侧断路器 QF和隔离刀闸 K;
10) 断开直流侧转换开关 Sl、 S2和 S4, 确认 Sl、 S2、 S3和 S4断开;
11 ) P站断开输电线路 TL与直流融冰装置 DI连接的融冰接入刀闸 SA, Q 站断开与输电线路 TL连接的融冰短接刀闸 SC,即输电线路 TL退出融冰状态, 进入冷备用状态;
12)将输电线路 TL转换为热备用状态,即 P站合上输电线路 TL与 P站母 线连接的隔离刀闸 KA, B站合上与相应母线连接的隔离刀闸 KB;
13)将输电线路 TL转换为运行状态,即 A站合上输电线路 TL与 P站母线 连接的断路器 QFA后, Q站合上与相应母线连接的断路器 QFB。
本发明与现有技术相比, 具有如下特点:
1) 本发明操作方便, 无需人工现场接线, 无需使用工具, 节省人力物力, 同时避免了人工接线时可能带来的人身伤害。
2) 本发明大大縮短融冰时的线路停运时间, 本发明中的方法可将一条
500kV线路总融冰时间控制在 4小时内。 通过倒闸操作动作完成融冰 装置的接入和断开, 线路不存在转检修时间, 大大提高融冰效率。
3) 本发明可靠性高。 人工临时接线, 可能由于不合理操作导致接入可靠 性得不到保证, 使得融冰无法顺利进行, 采用本方案实现自动接入, 可靠性大大提高。
4) 本发明的融冰方法使用的主要设备为一组与融冰线路连接融冰接入刀 闸和一组融冰短接刀闸, 采用三个单柱单臂垂直伸缩式隔离刀闸或单 柱双臂垂直伸缩式隔离刀闸实现, 占地较小, 在已建好的变电站实施 改造工程时, 一般无需进行新的征地, 具备较好的实施可行性。 附图说明 附图 1为全过程利用倒闸操作实施的输电线路融冰系统示意图; 附图 2为单柱单臂垂直伸縮式隔离刀闸正视示意图; 附图 3为单柱单臂垂直伸缩式隔离刀闸侧视示意图; 附图 4为单柱双臂垂直伸縮式隔离刀闸正视图示意图; 附图 5为单柱双臂垂直伸缩式隔离刀闸侧视图示意图; 附图 6 为融冰短接刀闸采用三个单柱单臂垂直伸缩式隔离刀闸低压侧短接 示意图;
附图 7 为融冰短接刀闸采用三个单柱双臂垂直伸縮式隔离刀闸低压侧短接 示意图;
附图 8 为本发明全过程利用倒闸操作实施的输电线路融冰系统的融冰方法 示意图。
具体实施方式
本发明的全过程利用倒闸操作实施的输电线路融冰系统,包括直流融冰装 置 DI, 直流侧转换刀闸 Sl、 S2、 S3和 S4, 融冰母线 DB, 融冰接入刀闸 SA, 需要融冰输电线路 TL, 融冰短接刀闸 SC, 以及直流融冰装置 DI与及其所在变 电站 P站内母线连接的断路器 QF、 隔离刀闸 K, 输电线路 TL与 Ρ站交流母线 连接的断路器 QFA、 隔离刀闸 KA, 输电线路 TL与另一变电站 Q站相应交流母 线连接的断路器 QFB、 隔离刀闸 KB, 直流侧转换刀闸 SI和 S2的一端短接后与 直流融冰装置 DI负极相连, 直流侧转换刀闸 S3和 S4—端短接后与直流融冰 装置 DI正极相连; 直流侧转换刀闸 S1另一端与融冰母线 DB中的 A相连接, 直流侧转换刀闸 S2和 S3另一端短接后与融冰母线 DB中的 B相连接, 直流侧 转换刀闸 S4另一端与融冰母线 DB中的 C相连接; 融冰接入刀闸 SA的低压侧 与融冰母线 DB连接, 融冰接入刀闸 SA的高压侧与输电线路 TL连接; 融冰短 接刀闸 SC的低压侧短接, 融冰短接刀闸 SC的高压侧与输电线路 TL连接。 上述输电线路 TL与直流融冰装置 DI的连接和隔离通过融冰接入刀闸 SA 和融冰短接刀闸 SC实现。
上述直流融冰装置 DI采用两个六脉动桥串联结构时两桥中点为直流融冰 系统的唯一接地点,采用单个六脉动桥或用两个六脉动桥并联结构时直流融冰 系统无接地点。
上述融冰接入刀闸 SA和融冰短接刀闸 SC采用三个单柱单臂垂直伸缩式隔 离刀闸或单柱双臂垂直伸缩式隔离刀闸构成。
上述融冰短接刀闸 SC中三个垂直伸缩式刀闸的低压端短接, 融冰接入刀 闸 SA中的三个垂直伸缩式刀闸的低压接线端不短接。
上述融冰接入刀闸 SA和融冰短接刀闸 SC采用的垂直伸缩式刀闸包括高压 支持绝缘瓷瓶 1、低压支持绝缘瓷瓶 2、操作绝缘瓷瓶 3、垂直开启式主刀闸 4、 静触头 5、 动触头 6、 均压环 7、 高压接线端子板 8、 低压接线端子板 9、 主刀 闸电动操作机构 10;所述高压支持绝缘瓷瓶 1的顶端与均压环 7的底面固定导 电连接; 所述高压支持绝缘瓷瓶 1的顶面固定安装有高压接线端子板 8, 均压 环 7的底面还固定安装有静触头 5,且静触头 5、高压接线端子板 8及均压环 7 之间为导电连接; 低压支持绝缘瓷瓶 2与操作瓷瓶 3等高、相互平行且上端相 连;所述低压支持绝缘瓷瓶 2顶端固定连接有所述低压接线端子板 9与垂直开 启式主刀闸 4, 低压接线端子板 9与所述的垂直开启式主刀闸 4下端之间为可 导电固定连接,垂直开启式主刀闸 4顶端与所述动触头 6之间为可导电固定连 接; 主刀闸电动操作机构 10与垂直开启式主刀闸 4之间通过操作瓷瓶 3传动 连接; 所述垂直开启式主刀闸 4伸展后的长度能使动触头 6与静触头 5接触, 所述垂直开启式主刀闸 4未伸展时动触头 6与静触头 5之间的距离满足动触头 6与静触头 5之间的绝缘水平与融冰线路电压等级所要求的电力开关设备断口 的绝缘水平相同。
上述融冰接入刀闸 SA和融冰短接刀闸 SC的低压支持绝缘瓷瓶 2和操作绝 缘瓷瓶 3的绝缘水平相同,高压支持绝缘瓷瓶 1的绝缘水平远高于低压支持绝 缘瓷瓶 2和操作绝缘瓷瓶 3的绝缘水平。
上述高压支持绝缘瓷瓶 1的长度满足高压支持绝缘瓷瓶 1的绝缘水平与融 冰线路 TL电压等级所要求的对地绝缘水平相同; 所述低压支持绝缘瓷瓶 2和 操作绝缘瓷瓶 3的长度满足其绝缘水平与直流融冰装置融冰母线 DB电压等级 所要求的对地绝缘水平相同。
上述融冰短接刀闸 SC中的三个垂直伸缩式刀闸的低压接线端子板 9通过 连接母排 11和 12连接。
本发明全过程利用倒闸操作实施的输电线路融冰系统的融冰方法,包括如 下步骤:
1 ) 将需要融冰的输电线路 TL转换为热备用状态, 即 P站断开输电线路 TL与 P站母线连接的断路器 QFA, 断开与 B站相应母线连接的断路器 QFB;
2 )将需要融冰的输电线路 TL转换为冷备用状态, 即 P站断开输电线路 TL与 P站母线连接的隔离刀闸 KA,断开与 B站相应母线连接的隔离刀闸 KB;
3 ) P站合上输电线路 TL与直流融冰装置 DI连接的融冰接入刀闸 SA, Q 站合上与输电线路连接的融冰短接刀闸 SC, 即输电线路 TL退出冷备用状态, 进入融冰状态;
4) 合上直流侧转换刀闸 S1和 S3, 确认 S2和 S4断开;
5)合上直流融冰装置 DI交流侧隔离刀闸 K和断路器 QF;
6)启动直流融冰装置 DI, 将直流电流升至输电线路 TL的设计融冰电流, 等候 A和 B相导线覆冰脱落, 即采用 "一去一回"直流融冰模式实现 A和 B相 导线串联融冰, 完成 A和 B相线路融冰后闭锁直流融冰装置 DI;
7)直流融冰装置 DI闭锁后启动融冰模式切换逻辑, 断开直流侧转换刀闸 S3, 闭合直流侧转换刀闸 S2和 S4, 即使得 Sl、 S2和 S4闭合, S3断开, 进入
"二去一回"直流融冰模式, 即 A和 B相导线并联后再与 C相导线串联;
8)启动直流融冰装置 DI, 将直流电流升至输电线路 TL的设计融冰电流, 等候 C相导线覆冰脱落, 完成 C相导线融冰后闭锁直流融冰装置 DI; 9) 断开直流融冰装置 DI交流侧断路器 QF和隔离刀闸 K;
10) 断开直流侧转换开关 Sl、 S2和 S4, 确认 Sl、 S2、 S3和 S4断开;
11 ) P站断开输电线路 TL与直流融冰装置 DI连接的融冰接入刀闸 SA, Q 站断开与输电线路 TL连接的融冰短接刀闸 SC,即输电线路 TL退出融冰状态, 进入冷备用状态;
12)将输电线路 TL转换为热备用状态,即 P站合上输电线路 TL与 P站母 线连接的隔离刀闸 KA, B站合上与相应母线连接的隔离刀闸 KB;
13)将输电线路 TL转换为运行状态,即 A站合上输电线路 TL与 P站母线 连接的断路器 QFA后, Q站合上与相应母线连接的断路器 QFB。

Claims

1、 全过程利用倒闸操作实施的输电线路融冰系统, 其特征在于包括直流 融冰装置 DI, 直流侧转换刀闸 Sl、 S2、 S3和 S4, 融冰母线 DB, 融冰接入刀闸 SA, 需要融冰输电线路 TL, 融冰短接刀闸 SC, 以及直流融冰装置 DI与及其所 在变电站 P站内母线连接的断路器 QF、 隔离刀闸 K, 输电线路 TL与 Ρ站交流 母线连接的断路器 QFA、 隔离刀闸 KA, 输电线路 TL与另一变电站 Q站相应交 流母线连接的断路器 QFB、 隔离刀闸 KB, 直流侧转换刀闸 SI和 S2的一端短接 后与直流融冰装置 DI负极相连, 直流侧转换刀闸 S3和 S4—端短接后与直流 融冰装置 DI正极相连; 直流侧转换刀闸 S1另一端与融冰母线 DB中的 A相连 接, 直流侧转换刀闸 S2和 S3另一端短接后与融冰母线 DB中的 B相连接, 直 流侧转换刀闸 S4另一端与融冰母线 DB中的 C相连接; 融冰接入刀闸 SA的低 压侧与融冰母线 DB连接, 融冰接入刀闸 SA的高压侧与输电线路 TL连接; 融 冰短接刀闸 SC的低压侧短接,融冰短接刀闸 SC的高压侧与输电线路 TL连接。
2、根据权利要求 1所述的全过程利用倒闸操作实施的输电线路融冰系统, 其特征在于上述输电线路 TL与直流融冰装置 DI的连接和隔离通过融冰接入 刀闸 SA和融冰短接刀闸 SC实现。
3、根据权利要求 1所述的全过程利用倒闸操作实施的输电线路融冰系统, 其特征在于上述直流融冰装置 DI采用两个六脉动桥串联结构时两桥中点为直 流融冰系统的唯一接地点,采用单个六脉动桥或用两个六脉动桥并联结构时直 流融冰系统无接地点。
4、根据权利要求 1所述的全过程利用倒闸操作实施的输电线路融冰系统, 其特征在于上述融冰接入刀闸 SA和融冰短接刀闸 SC采用三个单柱单臂垂直伸 缩式隔离刀闸或单柱双臂垂直伸缩式隔离刀闸构成。
5、根据权利要求 1所述的全过程利用倒闸操作实施的输电线路融冰系统, 其特征在于上述融冰短接刀闸 SC中三个垂直伸缩式刀闸的低压端短接, 融冰 接入刀闸 SA中的三个垂直伸缩式刀闸的低压端不短接。
6、 根据权利要求 1至 5所述的全过程利用倒闸操作实施的输电线路融冰 系统,其特征在于上述融冰接入刀闸 SA和融冰短接刀闸 SC采用的垂直伸缩式 刀闸包括高压支持绝缘瓷瓶(1 )、低压支持绝缘瓷瓶(2)、操作绝缘瓷瓶(3)、 垂直开启式主刀闸 (4)、 静触头 (5)、 动触头(6)、 均压环(7)、 高压接线端 子板 (8)、 低压接线端子板 (9)、 主刀闸电动操作机构 (10); 所述高压支持 绝缘瓷瓶(1 ) 的顶端与均压环(7) 的底面固定导电连接; 所述高压支持绝缘 瓷瓶(1 ) 的顶面固定安装有高压接线端子板(8), 均压环(7) 的底面还固定 安装有静触头 (5), 且静触头(5)、 高压接线端子板(8)及均压环(7)之间 为导电连接; 低压支持绝缘瓷瓶 (2) 与操作瓷瓶 (3)等高、 相互平行且上端相 连; 所述低压支持绝缘瓷瓶(2)顶端固定连接有所述低压接线端子板(9)与 垂直开启式主刀闸(4), 低压接线端子板(9)与所述的垂直开启式主刀闸(4) 下端之间为可导电固定连接, 垂直开启式主刀闸(4)顶端与所述动触头 (6)之 间为可导电固定连接; 主刀闸电动操作机构(10)与垂直开启式主刀闸 (4) 之 间通过操作瓷瓶(3)传动连接; 所述垂直开启式主刀闸 (4)伸展后的长度能 使动触头 (6) 与静触头 (5) 接触, 所述垂直开启式主刀闸 (4) 未伸展时动 触头 (6)与静触头(5)之间的距离满足动触头(6) 与静触头 (5)之间的绝 缘水平与融冰线路电压等级所要求的电力开关设备断口的绝缘水平相同。
7、 根据权利要求 1至 5所述的全过程利用倒闸操作实施的输电线路融冰 系统,其特征在于上述融冰接入刀闸 SA和融冰短接刀闹 SC的低压支持绝缘瓷 瓶 (2) 和操作绝缘瓷瓶 (3) 的绝缘水平相同, 高压支持绝缘瓷瓶 (1 ) 的绝 缘水平远高于低压支持绝缘瓷瓶(2) 和操作绝缘瓷瓶(3) 的绝缘水平。
8、 根据权利要求 1至 5所述的全过程利用倒闸操作实施的输电线路融冰 系统, 其特征在于上述高压支持绝缘瓷瓶 (1 ) 的长度满足高压支持绝缘瓷瓶
( 1 )的绝缘水平与融冰线路 TL电压等级所要求的对地绝缘水平相同; 所述低 压支持绝缘瓷瓶(2)和操作绝缘瓷瓶(3) 的长度满足其绝缘水平与直流融冰 装置融冰母线 DB电压等级所要求的对地绝缘水平相同。
9、 根据权利要求 1至 5所述的全过程利用倒闸操作实施的输电线路融冰 系统, 其特征在于融冰短接刀闸 SC中的三个垂直伸缩式刀闸的低压接线端子 板 ( 9)通过连接母排 (11)和 ( 12 ) 连接。
10、全过程利用倒闸操作实施的输电线路融冰系统的融冰方法, 包括如下 步骤:
1 ) 将需要融冰的输电线路 TL转换为热备用状态, 即 P站断开输电线路 TL与 P站母线连接的断路器 QFA, 断开与 B站相应母线连接的断路器 QFB;
2 ) 将需要融冰的输电线路 TL转换为冷备用状态, 即 P站断开输电线路 TL与 P站母线连接的隔离刀闸 KA,断开与 B站相应母线连接的隔离刀闸 KB;
3 ) P站合上输电线路 TL与直流融冰装置 DI连接的融冰接入刀闸 SA, Q 站合上与输电线路连接的融冰短接刀闸 SC, 即输电线路 TL退出冷备用状态, 进入融冰状态;
4) 合上直流侧转换刀闸 S1和 S3, 确认 S2和 S4断开;
5) 合上直流融冰装置 DI交流侧隔离刀闸 K和断路器 QF;
6)启动直流融冰装置 DI, 将直流电流升至输电线路 TL的设计融冰电流, 等候 A和 B相导线覆冰脱落, 即采用 "一去一回 "直流融冰模式实现 A和 B相 导线串联融冰, 完成 A和 B相线路融冰后闭锁直流融冰装置 DI;
7)直流融冰装置 DI闭锁后启动融冰模式切换逻辑, 断开直流侧转换刀闸 S3, 闭合直流侧转换刀闸 S2和 S4, 即使得 Sl、 S2和 S4闭合, S3断开, 进入
"二去一回"直流融冰模式, 即 A和 B相导线并联后再与 C相导线串联;
8)启动直流融冰装置 DI, 将直流电流升至输电线路 TL的设计融冰电流, 等候 C相导线覆冰脱落, 完成 C相导线融冰后闭锁直流融冰装置 DI;
9) 断开直流融冰装置 DI交流侧断路器 QF和隔离刀闸 K;
10) 断开直流侧转换开关 Sl、 S2和 S4, 确认 Sl、 S2、 S3和 S4断开;
11 ) P站断开输电线路 TL与直流融冰装置 DI连接的融冰接入刀闸 SA, Q 站断开与输电线路 TL连接的融冰短接刀闸 SC,即输电线路 TL退出融冰状态, 进入冷备用状态; 12)将输电线路 TL转换为热备用状态,即 P站合上输电线路 TL与 P站母 线连接的隔离刀闸 KA, B站合上与相应母线连接的隔离刀闸 KB;
13)将输电线路 TL转换为运行状态,即 A站合上输电线路 TL与 P站母线 连接的断路器 QFA后, Q站合上与相应母线连接的断路器 QFB。
PCT/CN2012/000740 2011-08-25 2012-05-28 全过程利用倒闸操作实施的输电线路融冰系统及其方法 WO2013026253A1 (zh)

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