CN103022992A - Feeder ground positioning method based on dispersion zero sequence voltage detection - Google Patents
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Abstract
本发明公开了一种基于分散零序电压检测的馈线接地定位方法,通过利用馈线自动化系统实现线路接地故障的处理,所述的方法包括:故障监测;故障跳闸:出线断路器保护跳闸,分段开关分闸,FTU上传信号;故障定位:通过零序电压的检测,判断故障区间;故障隔离,故障点两端开关闭锁;恢复供电:排除接地故障点后,再控制闭锁的分段开关合闸,恢复故障区的供电。本发明处理线路接地时,可以迅速定位接地区间并且自动隔离,不需要人员到现场排查整条线路,有效减少人力及资源消耗,便于故障检修人员对故障点的及时排除,不仅有效保障了线路维修人员和线路设备的安全,同时降低了线路停电时间及对停电用户造成的损失,大大提高了供电的可靠性。
The invention discloses a feeder grounding positioning method based on decentralized zero-sequence voltage detection. The grounding fault processing of the line is realized by using the feeder automation system. The method includes: fault monitoring; fault tripping: outgoing line circuit breaker protection tripping, segment The switch opens, and the FTU uploads the signal; Fault location: through the detection of zero-sequence voltage, the fault area is judged; Fault isolation, the switch at both ends of the fault point is locked; Power supply restoration: After the ground fault point is eliminated, then the blocked section switch is controlled to close , to restore power to the faulty area. When the invention handles the grounding of the line, it can quickly locate the grounding area and automatically isolate it. It does not require personnel to go to the site to check the entire line, effectively reducing manpower and resource consumption, and is convenient for troubleshooting personnel to eliminate the fault point in time, which not only effectively guarantees line maintenance. The safety of personnel and line equipment, while reducing the power outage time of the line and the loss caused by power outage users, greatly improves the reliability of power supply.
Description
技术领域technical field
本发明涉及配电网馈线自动化领域,具体地说是一种基于分散零序电压检测的馈线接地定位方法。The invention relates to the field of distribution network feeder automation, in particular to a feeder grounding positioning method based on decentralized zero-sequence voltage detection.
背景技术Background technique
据统计,10kV线路发生单相接地的故障占到线路故障的30%以上,线路发生单相接地时危害较大,具体体现在以下方面:According to statistics, single-phase grounding faults on 10kV lines account for more than 30% of line faults. Single-phase grounding of lines is more harmful, specifically reflected in the following aspects:
(1)危害变电设备。10kV配电线路发生单相接地故障后,电压互感器铁心饱和,励磁电流增加,如果长时间运行,将烧毁电压互感器。也可能产生几倍于正常电压的谐振过电压,危及变电设备的绝缘,严重者使变电设备绝缘出穿,造成更大事故。(1) Hazardous substation equipment. After a single-phase ground fault occurs on a 10kV distribution line, the iron core of the voltage transformer is saturated, and the excitation current increases. If it is operated for a long time, the voltage transformer will be burned. It may also generate a resonant overvoltage several times higher than the normal voltage, endangering the insulation of the substation equipment, and in severe cases, the insulation of the substation equipment will break through, causing even greater accidents.
(2)危害配电设备。单相接地故障发生后,可能产生间歇性弧光接地,造成谐振过电压,过电压将进一步使线路上的绝缘子绝缘击穿,造成严重的短路事故。同时可能烧毁配电变压器,使线路上的避雷器、熔断器绝缘击穿、烧毁,严重者可能发生电气火灾。(2) Hazardous power distribution equipment. After a single-phase ground fault occurs, intermittent arcing may occur, resulting in resonant overvoltage. The overvoltage will further cause insulation breakdown of the insulator on the line, resulting in a serious short circuit accident. At the same time, the distribution transformer may be burned, causing the lightning arrester and fuse insulation on the line to break down and burn out. In severe cases, an electrical fire may occur.
(3)危害配电网。严重的单相接地故障,可能破坏区域电网系统稳定,造成更大事故,影响供电的可靠性。(3) Harm the distribution network. Serious single-phase ground faults may destroy the stability of the regional power grid system, cause greater accidents, and affect the reliability of power supply.
(4)危害人身安全。对于导线落地这一类单相接地故障,对于行人和线路巡视人员,可能发生人为触电伤亡事故。(4) Endangering personal safety. For single-phase ground faults such as the grounding of conductors, human-induced electric shock casualties may occur for pedestrians and line inspectors.
(5)影响线损。发生单相接地故障时,由于配电线路接地直接或间接对大地放电,将造成较大的电能损耗。(5) Affect line loss. When a single-phase ground fault occurs, because the grounding of the distribution line directly or indirectly discharges the ground, it will cause a large power loss.
目前,10KV馈电线路接地时,传统处理方式是停掉接地线路,采用人工方式排查线路接地点,往往需要较长的时间和大量的人力和物力,造成线路长时间停电及资源浪费。At present, when the 10KV feeder line is grounded, the traditional treatment method is to stop the grounding line and manually check the grounding point of the line, which often takes a long time and a lot of manpower and material resources, resulting in long-term power outages and waste of resources.
发明内容Contents of the invention
本发明提供了一种基于分散零序电压检测的馈线接地定位方法,有效解决了处理线路接地费时费力、影响供电的问题。The invention provides a feeder grounding positioning method based on decentralized zero-sequence voltage detection, which effectively solves the problems of time-consuming and labor-intensive processing of line grounding and affecting power supply.
为了解决上述问题,本发明采用以下技术方案:基于分散零序电压检测的馈线接地定位方法,通过利用馈线自动化系统实现线路接地故障的处理,其特征在于,In order to solve the above problems, the present invention adopts the following technical solutions: a feeder grounding positioning method based on decentralized zero-sequence voltage detection, and realizes the processing of line grounding faults by using the feeder automation system, which is characterized in that,
所述馈线自动化系统包括:The feeder automation system includes:
在每个变电站的输出端设置一个变电站出线断路器,且所述的每个变电站控制一条配电线路;A substation outlet circuit breaker is set at the output end of each substation, and each substation controls a power distribution line;
不同的配电线路之间通过联络开关连接,所述联络开关在常态下处于打开状态;Different power distribution lines are connected through a tie switch, and the tie switch is in an open state under normal conditions;
在配电主干线路上设置有若干分段开关,所述的每个分段开关处均安装一个具备零序电压检测功能的FTU,且所述的分段开关与配电自动化主站形成通信连接;Several subsection switches are arranged on the power distribution main line, and an FTU with zero-sequence voltage detection function is installed at each subsection switch, and the subsection switch forms a communication connection with the distribution automation master station ;
所述的方法包括以下过程:The described method includes the following processes:
故障监测,所述故障跳闸的过程为:变电站出线断路器实时监测线路接地是否发生故障;Fault monitoring, the process of fault tripping is: the outlet circuit breaker of the substation monitors in real time whether the line grounding is faulty;
故障跳闸,所述故障跳闸的过程为:当线路上某点发生线路接地故障时,变电站出线断路器检测到线路接地故障,保护动作跳闸,线路上所有分段开关均因失压而分闸,与此同时,故障线路上的FTU检测到零序电压,并通过分段开关上传到配电自动化主站;Fault tripping, the process of fault tripping is: when a line grounding fault occurs at a certain point on the line, the circuit breaker of the substation outgoing line detects the line grounding fault, the protection action trips, and all the section switches on the line are opened due to voltage loss, At the same time, the FTU on the faulty line detects the zero-sequence voltage and uploads it to the distribution automation master station through the sub-section switch;
故障定位,所述故障定位的过程为:经过设定时间后,变电站出线断路器自动合闸,故障线路上的分段开关会按距离变电站由近及远的顺序,以设定时间为时限依次合闸,在分段开关合闸的同时,分段开关上的FTU得电工作,检测线路中是否存在零序电压,当某一个FTU检测到零序电压时,该FTU所在的分段开关自动闭锁,并向主站系统发出信息,定位出故障区间为闭锁分段开关的后端;Fault location, the process of fault location is: after the set time, the substation outgoing line circuit breaker will automatically close, and the section switches on the faulty line will be in the order of distance from the substation from near to far, with the set time as the time limit. Closing, when the section switch is closed, the FTU on the section switch is energized to work, and detects whether there is zero-sequence voltage in the line. When a certain FTU detects zero-sequence voltage, the section switch where the FTU is located automatically Block and send information to the main station system to locate the fault zone as the back end of the block switch;
故障隔离,所述故障隔离的过程为:在故障区前端的分段开关闭锁后,再经过设定时间后,故障区后端的分段开关或联络开关因失压维持闭锁状态,实现对故障区的隔离;Fault isolation, the process of fault isolation is: after the section switch at the front end of the fault area is locked, and after the set time, the section switch or contact switch at the back end of the fault area maintains a locked state due to voltage loss, realizing the fault area isolation;
恢复供电,所述的恢复供电过程为:线路维护人员到故障停电区间查找并排除接地故障点后,再控制闭锁的分段开关合闸,恢复故障区的供电。Restoring power supply, the process of restoring power supply is as follows: after the line maintenance personnel search and eliminate the grounding fault point in the fault power outage area, then control the closed section switch to close and restore the power supply in the fault area.
进一步地,上述方法所述的设定时间为7秒。Further, the setting time described in the above method is 7 seconds.
进一步地,上述方法所述的恢复供电过程中,当故障区后端为分段开关时,联络开关会在第一次跳闸后进入倒计时时间,倒计时时间结束后联络开关自动闭合,实现另一端变电站对故障区后端部分的供电。Further, in the process of restoring power supply described in the above method, when the rear end of the fault area is a section switch, the tie switch will enter the countdown time after the first trip, and the tie switch will automatically close after the countdown time ends, realizing the substation at the other end. Power supply to the rear part of the fault zone.
进一步地,上述方法所述的倒计时时间为45秒。Further, the countdown time described in the above method is 45 seconds.
进一步地,上述方法所述的恢复供电过程中,可以通过远程遥控和现场手动操作两种方式中的一种实现闭锁分段开关的合闸。Further, in the process of restoring the power supply described in the above method, the closing of the blocking section switch can be realized through one of two ways of remote control and on-site manual operation.
本发明的有益效果是:本发明处理线路接地时,可以迅速定位接地区间并且自动隔离,不需要人员到现场排查整条线路,有效减少人力及资源消耗,便于故障检修人员对故障点的及时排除,不仅有效保障了线路维修人员和线路设备的安全,同时降低了线路停电时间及对停电用户造成的损失,大大提高了供电的可靠性。The beneficial effects of the present invention are: when the present invention handles the grounding of the line, it can quickly locate the grounding area and automatically isolate it, without the need for personnel to go to the site to check the entire line, effectively reducing manpower and resource consumption, and facilitating the timely troubleshooting of fault points by troubleshooting personnel , not only effectively guarantee the safety of line maintenance personnel and line equipment, but also reduce the power outage time of the line and the losses caused by power outage users, and greatly improve the reliability of power supply.
附图说明Description of drawings
图1是本发明的流程示意图;Fig. 1 is a schematic flow sheet of the present invention;
图2是本发明一种实施例的线路示意图。Fig. 2 is a schematic circuit diagram of an embodiment of the present invention.
具体实施方式Detailed ways
如图1所示,该发明的一种基于分散零序电压检测的馈线接地定位方法,它通过利用馈线自动化系统实现线路接地故障的处理。As shown in Figure 1, the invention provides a feeder ground fault location method based on distributed zero-sequence voltage detection, which realizes the processing of line ground faults by utilizing the feeder automation system.
所述馈线自动化系统包括:The feeder automation system includes:
在每个变电站的输出端设置一个变电站出线断路器,且所述的每个变电站控制一条配电线路;A substation outlet circuit breaker is set at the output end of each substation, and each substation controls a power distribution line;
不同的配电线路之间通过联络开关连接,所述联络开关在常态下处于打开状态;Different power distribution lines are connected through a tie switch, and the tie switch is in an open state under normal conditions;
在配电主干线路上设置有若干分段开关,所述的每个分段开关处均安装一个具备零序电压检测功能的FTU,且所述的分段开关与配电自动化主站形成通信连接;Several subsection switches are arranged on the power distribution main line, and an FTU with zero-sequence voltage detection function is installed at each subsection switch, and the subsection switch forms a communication connection with the distribution automation master station ;
所述的方法包括以下过程:The described method includes the following processes:
故障监测,所述故障跳闸的过程为:变电站出线断路器实时监测线路接地是否发生故障;Fault monitoring, the process of fault tripping is: the outlet circuit breaker of the substation monitors in real time whether the line grounding is faulty;
故障跳闸,所述故障跳闸的过程为:当线路上某点发生线路接地故障时,变电站出线断路器检测到线路接地故障,保护动作跳闸,线路上所有分段开关均因失压而分闸,与此同时,故障线路上的FTU检测到零序电压,并通过分段开关上传到配电自动化主站;Fault tripping, the process of fault tripping is: when a line grounding fault occurs at a certain point on the line, the circuit breaker of the substation outgoing line detects the line grounding fault, the protection action trips, and all the section switches on the line are opened due to voltage loss, At the same time, the FTU on the faulty line detects the zero-sequence voltage and uploads it to the distribution automation master station through the sub-section switch;
故障定位,所述故障定位的过程为:经过7秒后,变电站出线断路器自动合闸,故障线路上的分段开关会按距离变电站由近及远的顺序,以7秒为时限依次合闸,在分段开关合闸的同时,分段开关上的FTU得电工作,检测线路中是否存在零序电压,当某一个FTU检测到零序电压时,该FTU所在的分段开关自动闭锁,并向主站系统发出信息,定位出故障区间为闭锁分段开关的后端;Fault location, the process of fault location is: after 7 seconds, the substation outlet circuit breaker will automatically close, and the subsection switches on the faulty line will be closed sequentially according to the order of distance from the substation from near to far, taking 7 seconds as the time limit , while the section switch is closed, the FTU on the section switch is powered on to detect whether there is a zero-sequence voltage in the line. When a certain FTU detects the zero-sequence voltage, the section switch where the FTU is located is automatically blocked. And send a message to the main station system to locate the fault zone as the back end of the blocking section switch;
故障隔离,所述故障隔离的过程为:在故障区前端的分段开关闭锁后,再经过7秒后,故障区后端的分段开关或联络开关因失压维持闭锁状态,实现对故障区的隔离;Fault isolation, the process of fault isolation is: after the segment switch at the front end of the fault area is locked, after 7 seconds, the segment switch or contact switch at the rear end of the fault area maintains a locked state due to pressure loss, so as to realize the isolation of the fault area. isolation;
恢复供电,所述的恢复供电过程为:线路维护人员到故障停电区间查找并排除接地故障点后,再通过远程遥控和现场手动操作两种方式中的一种实现闭锁分段开关的合闸,恢复故障区的供电。Restoring the power supply, the process of restoring the power supply is: after the line maintenance personnel go to the fault power outage section to find and eliminate the ground fault point, and then realize the closing of the blocking section switch by means of remote control and on-site manual operation, Restore power to the faulty area.
进一步的,所述的恢复供电过程中,当故障区后端为分段开关时,联络开关会在第一次跳闸结束45秒后自动闭合,实现另一端变电站对故障区后端部分的供电。Further, in the process of restoring power supply, when the back end of the fault area is a section switch, the tie switch will be automatically closed 45 seconds after the first trip, so as to realize the power supply of the substation at the other end to the back end of the fault area.
图2是本发明一种实施例的线路示意图。如图2所示,一个典型10kV联络线路的接线图,K为变电站出线断路器,K1、K2、K3为分段开关,T为联络开关,FTU1、FTU2、FTU3是具备零序电压检测功能的FTU,假设接地点发生A点,处理过程如下:Fig. 2 is a schematic circuit diagram of an embodiment of the present invention. As shown in Figure 2, the wiring diagram of a typical 10kV tie line, K is the substation outlet circuit breaker, K1, K2, K3 is the section switch, T is the tie switch, FTU1, FTU2, FTU3 are equipped with zero-sequence voltage detection function FTU, assuming that point A occurs at the grounding point, the processing process is as follows:
1)发生接地时,K检测到线路接地故障,保护动作跳闸,K1、K2、K3均因失压而分闸;同时,线路上的FTU1、FTU2、FTU3检测到零序电压异常并上传至主站;1) When grounding occurs, K detects the line grounding fault, the protection action trips, and K1, K2, and K3 all open due to voltage loss; at the same time, FTU1, FTU2, and FTU3 on the line detect abnormal zero-sequence voltage and upload it to the main stand;
2)7秒后,K自动合闸,14秒后,K1合闸,FTU1得电后检测零序电压,由于没有出现零序电压信号异常,合闸正常;2) After 7 seconds, K automatically closes, and after 14 seconds, K1 closes, and FTU1 detects the zero-sequence voltage after it is powered on. Since there is no abnormal zero-sequence voltage signal, the closing is normal;
3)21秒后,K2合闸,FTU2得电后检测零序电压,出现零序电压信号异常,合闸异常,K2闭锁,定位故障区位于K2后端;3) After 21 seconds, K2 is closed, and the zero-sequence voltage is detected after FTU2 is powered on. The zero-sequence voltage signal is abnormal, the closing is abnormal, K2 is blocked, and the fault location is located at the rear end of K2;
4)28秒后,K3失压,未检测到电流,仍然处于闭锁状态,实现故障区隔离;4) After 28 seconds, K3 loses voltage, no current is detected, and it is still in the locked state, realizing the isolation of the fault area;
5)45秒后,T闭合,另一端变压器给K3和T之间的线路供电;5) After 45 seconds, T is closed, and the transformer at the other end supplies power to the line between K3 and T;
6)调度人员通知线路维护人员到故障停电区间查找接地故障点,由于故障已被隔离,处于停电状态,维护人员也不会有工作的危险,线路维护人员查找到故障点并维修排除后,通知调度人员远方遥控FTU2合闸或维护人员本地操作合闸,恢复停电区间的供电。6) The dispatcher informs the line maintenance personnel to find the ground fault point in the fault power outage section. Since the fault has been isolated and the power is cut off, the maintenance personnel will not be in danger of working. After the line maintenance personnel find the fault point and repair and eliminate it, notify Dispatchers remotely close the FTU2 switch or maintenance personnel close the switch locally to restore the power supply in the blackout section.
以上所述只是本发明的优选实施方式,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,还可以做出若干改进和润饰,这些改进和润饰也被视为本发明的保护范围。The above is only a preferred embodiment of the present invention. For those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered as the present invention. protection scope of the invention.
Claims (5)
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CN103746353A (en) * | 2013-12-31 | 2014-04-23 | 宏秀电气有限公司 | Self-healing control system of intelligent distribution network and working method thereof |
CN103792465A (en) * | 2013-12-24 | 2014-05-14 | 中国矿业大学 | Power distribution network one-phase grounding fault location method based on zero sequence voltage |
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CN105137294B (en) * | 2015-09-25 | 2018-08-31 | 国网山东省电力公司济南供电公司 | A kind of voltage-type distribution system single phase earthing troubleshooting methodology |
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CN109061378A (en) * | 2018-06-09 | 2018-12-21 | 广西电网有限责任公司电力科学研究院 | Small current neutral grounding system ground fault checks method |
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