特高压输电线路负序方向纵联保护的研究 范子杰
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特高压输电线路负序方向纵联保护的研究
范子杰
高压
输电
线路
方向
联保
研究
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特高压输电线路负序方向纵联保护的研究 范子杰,特高压输电线路负序方向纵联保护的研究,范子杰,高压,输电,线路,方向,联保,研究
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华北电力大学科技学院毕业设计(论文)任务书所在系别 电力工程系 专业班号 电气07k7 学生姓名 范子杰 指导教师签名 审批人签字 毕业设计(论文)题目 特高压输电线路负序方向纵联保护的研究 年 月 日一、毕业设计(论文)主要内容1. 熟悉特高压输电及负序方向纵联保护的发展现状和历史。2. 了解特高压输电输电线路分布电容、非周期分量和高频分量的特点。3. 研究适用于特高压输电线路负序方向纵联保护原理,提出适用于特高压输电线路的主保护配置方案。4. 翻译相关的外文文献二、基本要求1. 遵守学校规章制度和毕业设计期间的管理规定，按时认真完成文献综述、开题报告、中期检查、毕业设计内容研究、论文撰写和答辩等环节；2. 毕业论文的撰写应符合华北电力大学本科毕业设计（论文）规定、规范(2006年修订)和华北电力大学毕业论文（设计说明书）的撰写规范及要求(2006年修订)。论文应有中文和英文摘要，有一定字数的文献综述；3. 翻译一篇不少于3000汉字的外文文献，翻译资料作为毕业设计（论文）附件附录单独装订成册。三、设计(论文)进度序号设计项目名称完成时间备注1查阅资料并进行文献翻译，完成开题报告设计开始后的1-3周2熟悉特高压输电及方向纵联保护的发展现状和历史。4-5周3了解特高压输电输电线路分布电容、非周期分量和高频分量的特点。6-7周4研究适用于特高压输电线路负序方向纵联保护原理,提出适用于特高压输电线路的主保护配置方案。8-10周5撰写论文11周以后设计(论文)预计完成时间： 年 月 日四、参考资料及文献1 张保会,尹项根.电力系统继电保护.北京：中国电力出版社,2005.2 毛和君,王立民.特高压输电线路的特点及其继保研究.中国科技信息，2007 .19. 3 薛士敏.特高压输电线路方向纵联保护:博士学位论文.天津:天津大学,2008.4 贺家李,李永丽,郭征,李斌.特高压输电线继电保护配置方案的探讨.天津电力技术.2003(2/3合刊):31-49.5 薛士敏,贺家李,李永丽.特高压输电线路分布电容对负序方向纵联保护的影响.电网技术.2008.9. 6 薛士敏,贺家李,李永丽.特高压输电线路负序方向纵联保护.电力系统自动化.2007.9.25 7 周金辉.特高压输电线能量方向纵联保护.天津:天津大学,2007.8 电机工程学报，电网技术,电力系统自动化等杂志相关文献.五、附录华北电力大学科技学院毕 业 设 计（论 文）开 题 报 告学生姓名： 范子杰 班级： 电气07K7 所在系别： 电力工程系 所在专业： 电自 设计（论文）题目：特高压输电线路负序方向纵联保护的研究 指导教师： 李婷 2011年 3月 10日毕 业 设 计（论 文）开 题 报 告一、结合毕业设计（论文）课题情况，根据所查阅的文献资料，每人撰写不低于2000字的文献综述。（另附）二、本课题要研究或解决的问题和拟采用的研究手段（途径）：上世纪七十年代，世界上很多国家在建成 750kV 等级的电网后即开始研究、建设特高压交流输电线。根据负荷增长的需要，在前苏联（80 年代）和日本（90年代）已分别建成 1150kV 和 1000kV 特高压输电线。我国装机容量居世界第二位，但电网却相对薄弱，这大大降低了电力系统运行的安全性和稳定性，因此建设更高电压等级的输电线不但具有巨大的经济效益，也是建设安全、稳定的全国统一电网所必需的。然而建设安全、稳定的全国统一电网，其最重要的是保证其输电线路的安全运行，这就需要结合现有条件与国内外先进的技术与经验，找出一个适合我国大型特高压输电网的继电保护方式。本课题所要研究的内容就是特高压输电线路中方向纵联保护原理及应用。通过查找文献资料法，熟悉方向纵联保护原理，采用MATLAB仿真特高压输电线路，并通过部分继电保护整定计算验证该原理。 三、指导教师意见：1 对“文献综述”的评语： 2对学生前期工作情况的评价（包括确定的研究方法、手段是否合理等方面）：指导教师： 年 月 日 0-7803-9514-X/06/$20.00 2006 IEEE ICIEA 2006 Discussion on Power System Dual-configuration Relay Protection Scheme on EHV Networks Hui Xiao, Xuebin Wu, Lixing Zhou, Xiangjun Zeng College of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha, Hunan Province, 410077, P. R. China, E-mail: xiaofei93 Abstract According to the twenty-five instructions about anti-accident measure and the technical code for relaying protection and security automatic equipment, the principle and significance of dual-configuration relay protection on EHV networks is put forward. The characteristics of dual-configuration relay protection in several aspects are researched and analyzed, such as DC power supply, alternating current, alternating current voltage, transmission channel and so on. And some methods to solve the problems are present. Specific aspects of dual-configuration of relay protection are discussed and counter measures are proposed. It has great significance to provide high security and stability for power system.1 Index Terms: redundant sets of protection, witching, pressure escapement, protection configuration, and dual-configuration relay protection. 1 Introduction At present, EHV networks continuously develop and networks frame has been strengthened more. With the rapidly development of computer technology and communications technology, the technology of relay protection in power system have developed with high speed. According to desire of the technical code for relaying protection and security automatic equipment, the main protection of 500kV network all adopts dual-configuration relay protection 1. According to the conditions of network practice running and the development of the technology of relay protection in future, it will contribute to the development of relay protection in EHV networks. The dual-configuration of microcomputer protective means the protective device and the secondary circuit wiring are dually configured and installed in respective This work was supported in part by Hong Kong Polytechnic University Research Grant GYC52, National Natural Science Foundation of China 50207001, Natural Science Foundation of China (60474070) and Hunan Provincial National Science Foundation of China (04JJ3031). Hui Xiao is with the College of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha, Hunan Province, 410077, P. R. China (e-mail: xiaofei93). cubicles. Every protection cubicle should be independently and completely wired according to single-disposition. Only one protection cubicle is added for dual-configuration 2. The own anti-trip of circuit breaker and the secondary wiring of two tripping coils are applied to implement the compliant complement wiring for dual-configuration. In the same protection cubicle, one group of voltage transformer and current transformer shall be adopted for main and back microcomputer integrative protection or main and back microcomputer dividual protection. The dual-configuration protective device lectotype should be consistent in the design of a power plant or substation. There are two principles for the configuration of protection. Firstly, any power equipment should be operated under protection of relay protection. Secondly, any power equipment should be protected with two sets of complete relay protection devices to control respectively two absolute special breakers. 2 Two sets of relay protection devices separately control two breakers in order to regards as the reliable redundant devices. As one set of protection devices or one breaker fail in operation, the other one will reliably and securely cut the fault parts. It often adopts near back-up protection as the line relay protection for EHV networks. That is, when the fault components relay protection refuses action, the redundant one will do it. If the breaker refuses action, the glitch protection devices will start-up to cut every breaker of power supply that connected with the same bus with fault components. 2 Analyse on dual-configuration protection actuality According to the dual-configuration relay protection principle, equipment and transmission line over 220kV should fit out two sets of independent protection devices 3. It is requirement that hasnt public pack between the two sets of protection devices 5. However, there are some aspects between the two sets of protection devices should be improved. 2.1 Problem of DC source and the improving methods It is definitely pointed out in “anti-accident measure” that, take one set of trip winding in breaker for instance, it is demanded that DC source by AC voltage switched, of which breaker protection and the first set of protection should come from the primary DC, and that of breaker operating power supply and the redundant protection should come from the secondary DC 4. But two loops DC is not completely separated; if breaker voltage closedown loop is realized in operate case between breaker control loops which adopt two trip winding. Xuji Electric Company produces ZFZ-12S operation case as an example is given. It is observed from Fig.1 (only one phase of two tripping circuit separate phases output is displayed) that pressure blocking relay 1YJJ supply source origin from and segment direct current inter-switching public source. But according to “anti-accident measure”, in order to prevent from direct current disappear by public circuit short cut, it is should not adopt loss voltage automatic switch direct current 1. Therefore it is often make the public direct current origin from segment current in practice implement. It is short connect 4D1 and 4D7, short connect 4D61 and 4D67, and cut 1JJ between them. But 1YJJ winding will loss magnetism when segment direct current disappeared. It also makes 1YJJ2 ordinary opening point which series in the second tripping circuit (between 4D5 and 4D6) cut off and then the current disappear. So the second tripping circuit has no effect on the circuit. Therefore, some methods should be taken to improve them. One method is that, it can be increased one pressure relay 1YJJin operate case, take pressure tripping point from breaker box and connect to 1YJJ. Because 1YJJorigin from segment direct current (between 4D5 and 4D65), 1YJJ2 is replaced by ordinary open point 1YJJ and series in the second tripping circuit (between 4D5 and 4D65) in order to realize pressure blocking. The conclusion is that tripping exit is not affected whatever power source disappear. Another method is that, at present, breaker outfit have on perfect pressure tripping circuit in new transformer substation GIS primary equipment, so press-tripping circuit in operate case can be cancelled. At the same time 4D1, 4D3, 4D5 and 4D6 points are parallel and YJJ point is short cut. Therefore, the problem can be solved. There are same problems for NanRui CZX-12 operating case. 4 4DK14DK2 4YJJ 4DK24DK1TJ1TJ2DLDL+KM I+KM II4D14D54D71R4D102R4D581YJJ1YJJ4YJJ-KM II -KM I4D654D611JJ31JJ42JJ1JJ1YJJ14D31YJJ24D6Protection exit1TXJTBJ2TXJTBJTQ1TQ2Breaker outfit1JJ11JJ24D67 Fig.1. ZFZ-12 separated case operate pressure blocking and tripping circuit 2.2 Problem of AC voltage and the improving methods It is regulated by the twenty-five instructions about anti-accident measure and the technical code for relaying protection and security automatic equipment that AC voltage and AC current of two segment protection equipments of Dual-configuration scheme should be origin from in dependent winding of potential transformer and current transformer. The protection scope should be overlapped to avoid blind spots. In protection scheme practice, the two AC voltage of segment protect ion is take from a winding of potential transformer and isnt divided. Whats more, in transformer substation of double bus connection, the switch principle of bus AC secondary voltage is adopt direct current middle relay control manner (It is showed as Fig.2 and Fig.3). 13 KM-KM1ZKK1ZKKIGIIG IGIIG IGWJIGWJmicrobuses and fuseYH disconnect switch reaction relay IYH disconnect switch reaction relay II Fig.2.principle of double-buses TV disconnect switch reset A601B601C601ZKKZKKZKKA602B602C6021GWJ1GWJ1GWJA630B630C630N600Sa630L630Sa601L601Sa6021GWJ1GWJ1YMa1YMb1YMc1YMNSaYMYML Fig.3. The connection chart of the AC microbuses of bus There are also some limitations upon AC voltage switch principle. It is specific point out in “anti-accident measure in middle of Chinese power networks” that TV AC switch box dont permit adopting the service connection matter by one public direct current fuse in order to prevent the direct current fuse fusion, cause all AC voltage circuits which connect with the same bus disappeared. It also cause direction and distance protection refusing operate and glitch fault. TV AC switch circuit that controlled by direct current mid-relay should notice the problem. In this switch matter, when the direct current source of TV AC switch disappeared or TV switch contact failure, the same two voltage-grading buses will loss voltage. The directional protection of two segment protections will refuse to operate when AC voltage disappear. Further more, it cant start-up the protection to clear faults. If the system fault happened, it will cause large network accident. Therefore, the TV switch principle needs improve. The methods are as following. One method is make two-position relay as switch relay. The method has been wildly used in transmission line and component protection of Xuji, NanRui and other companys. It is that use normal open contact of disconnect switch to initiate and retain relay-acting winding. Assistant normal close contact initiate revert winding, in order to avoid AC loss voltage caused by direct current disappear or TV disconnect switch assistant contact error.4 The other method adopt another improve method (shown as Fig.4 and Fig.5). That is increasing a mid-relay in every bus switch loop (at busis 2GWJ, at bus is 2GWJ). And direct control power supply of the increasing mid-relay 2GWJ and 2GWJorigin from another direct microbus, and connect normal open contact 2GWJ and 2GWJ with 1GWJ and 1GWJin parallel. AC voltage microbuses will not loss voltage when one of the direct current disappears by chance. KMI-KMI1ZKK1ZKKIGIIG IGIIG IGWJIGWJ Fig.4. Principle of double-buses TV secondary switch () KMII-KMII2ZKK2ZKKIGIIG IGIIG 2GWJ2GWJCome from the TV of bus bar I Come from the TV of bus bar II Fig.5. Principle of double-buses TV secondary switch () Zero sequence direction components, which are made of exterior open-delta voltage 3U0 and 3I0, have caused a mass of error and refuse. The settling method adopts itself 3U0, and dont use TV thrice exterior open-delta voltage. So expert suggest if is can change three-circuit TV rated voltage from 100 V to 57V. Thus TV can provide two dependent protecting secondary circuits. The two protection of Dual-configuration relay protection can use dependent circuit of TV according to the twenty-five instructions about anti-accident measure and the technical code for relaying protection and security automatic equipment. 2.3 Problem of AC current and the improving methods Dual-configuration protection requires that different current transformer serves the two-segment protection. It is easily realized 6. All of current transformer with voltage equal or above 220kV have 5 or above 5 secondary winding. It can avoid die section protection of absolute damage cause by seeper in TA. 2.4 Actuality and improve of transmission channel It is required for dual-configuration relay protection to make two carrier-pilot protections have independent transmission channel. But there are some problems in practice protection devices. Take permission carrier-pilot protection for example, it may be occur refuse operate in phases faults, when the two channels both adopt phase-to-phase power line carrier transmission. Therefore the method should be improved by using one carrier channel and one microwave or optical fiber channel 2. 3 Conclusions With the development of power system, the requirement of relay protection reliability is higher and higher. Therefore, Dual-configuration protection is very important part. We should take some measures to improve and renovate dual-configuration protection, in order to insure reliability and security of power system. The functions of dual-configuration protection is to assure that one failure
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