CN102621451A - Distribution line single-phase grounding fault detecting method and system based on instantaneous signal method - Google Patents
Distribution line single-phase grounding fault detecting method and system based on instantaneous signal method Download PDFInfo
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- CN102621451A CN102621451A CN2012100882224A CN201210088222A CN102621451A CN 102621451 A CN102621451 A CN 102621451A CN 2012100882224 A CN2012100882224 A CN 2012100882224A CN 201210088222 A CN201210088222 A CN 201210088222A CN 102621451 A CN102621451 A CN 102621451A
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- 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
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
The invention discloses a distribution line single-phase grounding fault detecting method and a system based on an instantaneous signal method. The method includes the steps of using electronic type mutual inductor for collecting instantaneous current and phase voltage of distribution lines; separating capacitance current components in the instantaneous current, determining that a single-phase grounding fault occurs to a phase line when the detected capacitance current is larger than a preset threshold value; comparing the phase voltage collected by the electric type mutual inductor, and determining that a grounding fault in the user sector occurs when the phase voltage leaps.
Description
Technical field
The present invention relates to a kind of distribution line Earth Fault Detection technology, relate in particular to a kind of distribution circuit single-phase earth fault detection method and system based on " momentary signal method ".
Background technology
The fault that electric line takes place is singlephase earth fault mostly; Because distribution mostly is a small current neutral grounding system, behind the generation singlephase earth fault, fault current is very small; Traditional zero-sequence component determining method poor sensitivity; Rate of false alarm is high, and switch can not accurately be judged fault still out-of-bounds in play, and house dog was lost efficacy.
Especially for urban distribution network; Arc suppression coil is installed in the transformer station; Be used for the capacitance current behind the compensated line generation singlephase earth fault, the zero-sequence current component after the compensation does not almost completely have, and judges that singlephase earth fault is inaccurate; Reliability is low, and can't judge fault types such as instantaneity ground connection, intermittent earth.
Summary of the invention
The object of the present invention is to provide a kind of distribution circuit single-phase earth fault detection method and system, judge problems such as inaccurate, that reliability is low with the singlephase earth fault that the solution prior art exists based on the momentary signal method.
In order to address the above problem, the distribution circuit single-phase earth fault detection method based on the momentary signal method provided by the invention may further comprise the steps: utilize electronic mutual inductor to gather the momentary current and the phase voltage of distribution line; Separate the capacitance current component in the momentary current,, then judge this phase circuit generation singlephase earth fault when the capacitance current that detects during greater than the threshold values that is provided with in advance; Relatively the phase voltage of electronic mutual inductor collection when the phase voltage sudden change, is judged earth fault in the boundary is taken place.
According to a kind of preferred implementation of above-mentioned distribution circuit single-phase earth fault detection method based on the momentary signal method, wherein, further comprising the steps of: time-delay; Whether detection of ground faults disappears for the first time then; If disappear, then be judged as transient fault, the demarcation switch of distribution line is failure to actuate; If do not disappear, then with the demarcation switch separating brake; Whether detection of ground faults disappears for the second time, if disappear, then is judged as boundary's internal fault and warning, if disappear, then with the demarcation switch reclosing.
According to a kind of preferred implementation of above-mentioned distribution circuit single-phase earth fault detection method based on the momentary signal method, wherein, the time of said time-delay is one minute.
In order to address the above problem, the distribution circuit single-phase earth fault detection system based on the momentary signal method provided by the invention comprises: electronic mutual inductor, the momentary current and the phase voltage that are used to gather distribution line; The Earth Fault Detection module is connected with said electronic mutual inductor, is used for separating the single-phase capacitive earth current of momentary current, and competitive list is capacitance current and the threshold value that is provided with in advance relatively, and judges whether to take place earth fault and output drive signal; Controller is connected with the Earth Fault Detection module with said electronic mutual inductor, is used to receive said drive signal, and according to the phase voltage of distribution line, judges whether to take place in the boundary earth fault and exports corresponding switch controlling signal; Switch main body is connected with said controller, is used for carrying out the divide-shut brake action according to the switch controlling signal of said controller output.
The present invention passes through to detect in real time the instantaneous capacitance current of three-phase distribution circuit, and utilizes other multiple momentary signals as criterion, not only can accurately judge the generation singlephase earth fault, and further the failure judgement type is also taked corresponding action whereby.It is thus clear that, the present invention not only measurement data and fault judgement accurately and reliably, and function is more comprehensive.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 the present invention is based on the distribution circuit single-phase earth fault detection system preferred embodiment of momentary signal method and the theory structure synoptic diagram of application thereof;
Fig. 2 is the FB(flow block) that the present invention is based on the distribution circuit single-phase earth fault detection method preferred embodiment of momentary signal method.
Embodiment
To combine accompanying drawing of the present invention and embodiment below, technical scheme of the present invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Fig. 1 schematically shows the structure of the distribution circuit single-phase earth fault detection system preferred embodiment that the present invention is based on the momentary signal method and when using and the relation that couples of distribution line; As shown in the figure, this preferred embodiment comprises electronic mutual inductor 8, Switch main body 7, Earth Fault Detection module 6, controller 5.Wherein, electronic mutual inductor 8 couples with three-phase distribution circuit 9, is used to gather all kinds of voltage and current signals of distribution line, comprises the momentary current signal, signals such as for example single-phase capacitive earth current, quintuple harmonics, first half-wave, electric current, phase voltage.Earth Fault Detection module 6 is connected with electronic mutual inductor 8, controller 5; Be used for separating the single-phase capacitive earth current of momentary current; Competitive list is capacitance current and the threshold value (for example 10A) that is provided with in advance relatively, and judges whether to take place earth fault and output drive signal.Controller 5 is connected with Earth Fault Detection module 6 with electronic mutual inductor 8; Be used to receive drive signal; And according to the phase voltage of distribution line; Judge whether to take place in the boundary earth fault and export corresponding switch controlling signal Switch main body 7 to be connected, be used for carrying out the divide-shut brake action according to the switch controlling signal of controller 5 outputs with controller 5.
In this preferred embodiment shown in Figure 1; Controller 5 required power supplys are by voltage conversion circuit 2 supplies; Voltage conversion circuit 2 is coupled between distribution line 9 and the controller 5, and it carries out processing such as transformation, rectification or filtering to the power supply that is obtained from distribution line 9, with provisioning controller 5.
Fig. 2 shows a plurality of steps of the distribution circuit single-phase earth fault detection method preferred embodiment that the present invention is based on the momentary signal method, and it can be realized by preferred embodiment shown in Figure 1.Distribution line is in normal course of operation; Spuious distributed capacitance is arranged between the line-to-ground; Electric capacity has been full of electric charge owing to cable line has high-tension electricity; When this circuit generation single-phase earthing, distributed capacitance forms discharge channel in the earth point position, in a few tens of milliseconds, forms instantaneous capacitor discharge electric current.Given this; In preferred embodiment shown in Figure 2,, utilize precision height, the fast characteristics of survey frequency scope of electronic mutual inductor 8 like step S101; With the sensor of electronic mutual inductor 8, gather the momentary current signal that single-phase earthing takes place distribution line 9 as front end.Like step 103, the momentary current signal passes to Earth Fault Detection module 6.Earth Fault Detection module 6 is made up of analog current and integrated chip; Form special filtering and detect electric current, be used for isolating the capacitance current component of the momentary current signal of single-phase earthing, utilize comparator circuit then; Compare with the threshold values that is provided with in advance; When detecting signal during greater than threshold values, Earth Fault Detection module 6 judges that singlephase earth fault possibly take place these circuits, and earth point takes place is positioned at the position of electronic mutual inductor 8 mounting points rear ends (mounting points is a front end to the direction of transformer station; Direction to power load is the rear end), otherwise return step S101.
Further, for fear of the undesired signal that causes owing to the load current fluctuation, like step S105,, need judge distribution line 9 phase voltage signal at that time.The phase voltage of ground connection phase is owing to be grounded a short circuit and can descend, even voltage is zero, but not the circuit of ground connection phase is owing to want retention wire voltage constant, and can raise.In conjunction with above the signal of detected instantaneous capacitance current, controller 5 judges that singlephase earth fault really takes place back end of line, also can be described as earth fault in the boundary takes place, otherwise return step S101.
Earth fault comprises permanent earth fault, intermittent earth fault, types such as transient earthing fault.For permanent earth fault, very harmful to operation of power networks, several kinds of earth faults in back need to report to the police, but constantly electric-examination is repaiied.Therefore, when detection of ground faults, need distinguish the type of earth fault.
For permanent earth fault; Controller can carry out breaking-closing operating by CS, confirms in order to the method for further utilizing reclosing whether earth fault takes place in play, for example; In step S107; Delayed time one minute, certainly in other embodiment of the present invention, also can delay time 30 seconds or 90 seconds etc.And in step S109, whether detection of ground faults disappears, if disappear, then gets into step S111, and controller 5 judges that this time earth fault is transient fault, and does not send control signal to Switch main body 7, and the Switch main body 7 of distribution line 9 is failure to actuate.Among the step S109, if earth fault do not disappear, then get into step S113,5 of controllers send sub-gate signal to Switch main body 7.Then in step S115, by voltage signal and current signal that controller 5 sends according to electronic mutual inductor 8, whether detection of ground faults disappears once more; If disappear, execution in step S117 then, controller 5 judges that this time earth faults are boundary's internal fault and report to the police; If do not disappear; Then execution in step S119 sends energization control signal by controller 5 to Switch main body 7, makes Switch main body 7 reclosings.
This product is a criterion with the momentary signal of electronic mutual inductor collection, utilizes it to carry out fault judgement, can accurately detect the singlephase earth fault of stake resistance≤600 Ω, and distinguishes fault still out-of-bounds in play.It is thus clear that the present invention has accurately and reliably, the advantage of complete function when detecting and handle distribution line earth fault.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention answers the protection domain of said claim to be as the criterion.
Claims (4)
1. the distribution circuit single-phase earth fault detection method based on the momentary signal method is characterized in that, may further comprise the steps:
Utilize electronic mutual inductor to gather the momentary current and the phase voltage of distribution line;
Separate the capacitance current component in the momentary current,, then judge this phase circuit generation singlephase earth fault when the capacitance current that detects during greater than the threshold values that is provided with in advance;
Relatively the phase voltage of electronic mutual inductor collection when the phase voltage sudden change, is judged earth fault in the boundary is taken place.
2. the distribution circuit single-phase earth fault detection method based on the momentary signal method according to claim 1 is characterized in that, and is further comprising the steps of:
Time-delay, whether detection of ground faults disappears for the first time then, if disappear, then is judged as transient fault, and the demarcation switch of distribution line is failure to actuate, if do not disappear, then with the demarcation switch separating brake;
Whether detection of ground faults disappears for the second time, if disappear, then is judged as boundary's internal fault and warning, if disappear, then with the demarcation switch reclosing.
3. the distribution circuit single-phase earth fault detection method based on the momentary signal method according to claim 2 is characterized in that the time of said time-delay is one minute.
4. the distribution circuit single-phase earth fault detection system based on the momentary signal method is characterized in that, comprising:
Electronic mutual inductor, the momentary current and the phase voltage that are used to gather distribution line;
The Earth Fault Detection module is connected with said electronic mutual inductor, is used for separating the single-phase capacitive earth current of momentary current, and competitive list is capacitance current and the threshold value that is provided with in advance relatively, and judges whether to take place earth fault and output drive signal;
Controller is connected with the Earth Fault Detection module with said electronic mutual inductor, is used to receive said drive signal, and according to the phase voltage of distribution line, judges whether to take place in the boundary earth fault and exports corresponding switch controlling signal;
Switch main body is connected with said controller, is used for carrying out the divide-shut brake action according to the switch controlling signal of said controller output.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149494A (en) * | 2013-02-06 | 2013-06-12 | 西安理工大学 | Three-phase power grid voltage short-circuit fault diagnosis method |
| CN103163416A (en) * | 2013-03-28 | 2013-06-19 | 瑞安电力有限责任公司 | Method and device for detecting branch circuit single phase earth faults |
| CN103558502A (en) * | 2013-11-21 | 2014-02-05 | 国家电网公司 | Single-phase earth fault detection circuit, method and system |
| CN103605357A (en) * | 2013-11-20 | 2014-02-26 | 国电南瑞科技股份有限公司 | Test system for power distribution network boundary switch control apparatus |
| CN104215929A (en) * | 2014-09-25 | 2014-12-17 | 国家电网公司 | Electronic transformer status monitor system |
| CN105162088A (en) * | 2015-10-19 | 2015-12-16 | 广东求精电气有限公司 | 10kV cable network feed line power distribution station fault automatic detection system |
| CN105372478A (en) * | 2015-09-30 | 2016-03-02 | 成都协瑞珂科技有限公司 | A distributing line transient state grounding current detection method and device |
| CN105403779A (en) * | 2015-09-29 | 2016-03-16 | 昆明理工大学 | Direct current line fault recognition method based on polar line current gradient sum |
| CN112731065A (en) * | 2020-12-31 | 2021-04-30 | 上海宏力达信息技术股份有限公司 | Single-phase earth fault studying and judging method and system for ground reference transient characteristics |
| CN112909901A (en) * | 2021-01-25 | 2021-06-04 | 南京国电南自电网自动化有限公司 | Power distribution network line adaptive reclosing method and storage medium |
| CN114002547A (en) * | 2021-10-25 | 2022-02-01 | 国网湖北省电力有限公司恩施供电公司 | Secondary multipoint earth fault judgment equipment and analysis algorithm for mutual inductor |
| CN114113747A (en) * | 2021-11-19 | 2022-03-01 | 云南电网有限责任公司电力科学研究院 | Direct current transient state step standard device of TMR sensor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59135377A (en) * | 1983-01-24 | 1984-08-03 | Fuji Electric Co Ltd | Method for evaluating grounding fault point of three- phase power transmission distribution line |
| CN1295254A (en) * | 1999-11-08 | 2001-05-16 | 赵世红 | Single-phase earthing-fault display method and instrument for power supply line |
| CN101871986A (en) * | 2009-04-23 | 2010-10-27 | 上海市南供电设计有限公司 | Method for identifying single-phase stable grounding of medium-voltage distribution network |
| CN202166711U (en) * | 2011-07-25 | 2012-03-14 | 北京瑞科思创科技有限公司 | Single-phase grounding fault detecting device of power transmission and distribution line |
| CN202533542U (en) * | 2012-03-28 | 2012-11-14 | 北京水木源华电气有限公司 | Instantaneous signal method-based power distribution line single-phase ground fault detection system |
-
2012
- 2012-03-28 CN CN201210088222.4A patent/CN102621451B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59135377A (en) * | 1983-01-24 | 1984-08-03 | Fuji Electric Co Ltd | Method for evaluating grounding fault point of three- phase power transmission distribution line |
| CN1295254A (en) * | 1999-11-08 | 2001-05-16 | 赵世红 | Single-phase earthing-fault display method and instrument for power supply line |
| CN101871986A (en) * | 2009-04-23 | 2010-10-27 | 上海市南供电设计有限公司 | Method for identifying single-phase stable grounding of medium-voltage distribution network |
| CN202166711U (en) * | 2011-07-25 | 2012-03-14 | 北京瑞科思创科技有限公司 | Single-phase grounding fault detecting device of power transmission and distribution line |
| CN202533542U (en) * | 2012-03-28 | 2012-11-14 | 北京水木源华电气有限公司 | Instantaneous signal method-based power distribution line single-phase ground fault detection system |
Non-Patent Citations (2)
| Title |
|---|
| 徐丙垠等: "小电流接地故障监测新技术", 《中国城市供电学术年会论文集 》, 1 November 2005 (2005-11-01), pages 203 - 209 * |
| 谭享波: "小电流接地系统馈线故障定位系统的研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》, no. 4, 15 December 2004 (2004-12-15) * |
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| CN103149494A (en) * | 2013-02-06 | 2013-06-12 | 西安理工大学 | Three-phase power grid voltage short-circuit fault diagnosis method |
| CN103163416A (en) * | 2013-03-28 | 2013-06-19 | 瑞安电力有限责任公司 | Method and device for detecting branch circuit single phase earth faults |
| CN103163416B (en) * | 2013-03-28 | 2015-04-01 | 国家电网公司 | Method and device for detecting branch circuit single phase earth faults |
| CN103605357A (en) * | 2013-11-20 | 2014-02-26 | 国电南瑞科技股份有限公司 | Test system for power distribution network boundary switch control apparatus |
| CN103605357B (en) * | 2013-11-20 | 2016-01-13 | 南京南瑞集团公司 | The test macro of power distribution network boundary switch control device |
| CN103558502A (en) * | 2013-11-21 | 2014-02-05 | 国家电网公司 | Single-phase earth fault detection circuit, method and system |
| CN103558502B (en) * | 2013-11-21 | 2017-05-24 | 国家电网公司 | Single-phase earth fault detection circuit, method and system |
| CN104215929A (en) * | 2014-09-25 | 2014-12-17 | 国家电网公司 | Electronic transformer status monitor system |
| CN105403779B (en) * | 2015-09-29 | 2019-01-04 | 昆明理工大学 | A kind of DC line fault recognition methods based on polar curve current gradient sum |
| CN105403779A (en) * | 2015-09-29 | 2016-03-16 | 昆明理工大学 | Direct current line fault recognition method based on polar line current gradient sum |
| CN105372478B (en) * | 2015-09-30 | 2018-08-10 | 成都协瑞珂科技有限公司 | Distribution line transient state checking for grounded current method and device |
| CN105372478A (en) * | 2015-09-30 | 2016-03-02 | 成都协瑞珂科技有限公司 | A distributing line transient state grounding current detection method and device |
| CN105162088B (en) * | 2015-10-19 | 2016-06-15 | 广东求精电气有限公司 | A kind of power distribution station automatic fault detection system of 10kV cable system feeder line |
| CN105162088A (en) * | 2015-10-19 | 2015-12-16 | 广东求精电气有限公司 | 10kV cable network feed line power distribution station fault automatic detection system |
| CN112731065A (en) * | 2020-12-31 | 2021-04-30 | 上海宏力达信息技术股份有限公司 | Single-phase earth fault studying and judging method and system for ground reference transient characteristics |
| CN112909901A (en) * | 2021-01-25 | 2021-06-04 | 南京国电南自电网自动化有限公司 | Power distribution network line adaptive reclosing method and storage medium |
| CN114002547A (en) * | 2021-10-25 | 2022-02-01 | 国网湖北省电力有限公司恩施供电公司 | Secondary multipoint earth fault judgment equipment and analysis algorithm for mutual inductor |
| CN114002547B (en) * | 2021-10-25 | 2024-02-02 | 国网湖北省电力有限公司恩施供电公司 | Equipment for judging secondary multipoint ground fault of transformer and analysis algorithm |
| CN114113747A (en) * | 2021-11-19 | 2022-03-01 | 云南电网有限责任公司电力科学研究院 | Direct current transient state step standard device of TMR sensor |
| CN114113747B (en) * | 2021-11-19 | 2024-04-09 | 云南电网有限责任公司电力科学研究院 | Direct current transient step standard of TMR sensor |
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