CN102928739A - Method and system used for locating power grid single-phase ground faults and based on wireless sensor network - Google Patents
Method and system used for locating power grid single-phase ground faults and based on wireless sensor network Download PDFInfo
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Abstract
The invention discloses a method used for locating power grid single-phase ground faults and based on a wireless sensor network and belongs to the technical field of power distribution network single-phase ground fault diagnosis. The method is applicable to a 3-60 kv neutral point non-effective grounded power distribution network. The method includes that a wireless sensor network node arranged on a power distribution line is used for collecting phase current data and sending the phase current data to a data management node, the data management node sums three-phase instantaneous current to obtain zero-sequence current; and a fault area is determined according to an online location fault criterion, namely phase difference of a front zero-sequence current phase and a rear zero-sequence current phase of a fault point is 180 degrees. The invention further provides a system used for locating the power grid single-phase ground faults and based on the wireless sensor network. The method and system guarantees the reliability of data transmission, improves accuracy of fault location, and solves problems in the prior art.
Description
Technical field
The invention belongs to one-phase earthing failure in electric distribution network diagnostic techniques field, relate in particular to a kind of electric network single-phase earth fault localization method and system based on wireless sensor network.
Background technology
China 3～60kv power distribution network extensively adopts the neutral non-effective grounding mode, belongs to small current neutral grounding system, and the fault overwhelming majority of small current neutral grounding system is singlephase earth fault, and singlephase earth fault is topmost fault type.In case the generation singlephase earth fault, traditional artificial line walking is not only wasted time and energy, and the operation of need to operating a switch in a large number, and the normal operation of electrical network and safety in production are brought very large inconvenience.Therefore, after fault occurs, the position of the localization of faults as soon as possible.It is more accurate to locate, and fault is got rid of rapider, more is conducive to guarantee the safe and reliable operation of electrical network.
The one-phase earthing failure in electric distribution network localization method mainly contains injecting signal, impedance method and traveling wave method at present.Because during distribution generation singlephase earth fault, fault-signal is faint, be difficult to identification, and distribution network line branch is many, complex structure generally mostly is tree topology, has brought very large difficulty to localization of fault, and locating accuracy and bearing accuracy are not high.
Summary of the invention
The object of the invention is to, propose a kind of electric network single-phase earth fault localization method and system based on wireless sensor network, in order to solve existing one-phase earthing failure in electric distribution network locating accuracy and the not high problem of precision.
To achieve these goals, the technical scheme of the present invention's proposition is that a kind of one-phase earthing failure in electric distribution network localization method based on wireless sensor network is characterized in that described method comprises:
Step 1: on distribution network line, every setpoint distance an observation station is set, at each power distribution network branch road an aggregation node is set;
Step 2: at each observation station place, access wireless sensor network node at three-phase line respectively, three wireless sensor network nodes gather respectively the current data of three-phase line;
Step: 3: from three wireless sensor network nodes of each observation station, select a wireless sensor network node as the data management node; For each observation station, wireless sensor network node sends the current data of the corresponding phase circuit that gathers separately to the data management node, thereby obtains the current data of the three-phase line of each observation station;
Step 4: the data management node of each observation station obtains the zero-sequence current of each observation station to the current data addition of the three-phase line of residing observation station;
Step 5: the data management node judges whether the zero-sequence current of residing observation station surpasses setting threshold, if surpass setting threshold, then execution in step 6; Otherwise the wireless sensor network node that accesses on the three-phase line of each observation station continues to gather the current data of three-phase line;
Step 6: the data management node sends to aggregation node with the zero-sequence current of residing observation station, and triggers the data management node of adjacent observation station, and the data management node that makes adjacent observation station is sent to aggregation node with the zero-sequence current of adjacent observation station;
Step 7: aggregation node is the zero-sequence current phase place of two adjacent observation stations relatively, if the zero-sequence current phase differential of two adjacent observation stations is 180 °, judges that then singlephase earth fault occurs between these two adjacent observation stations.
A kind of single-phase grounding fault positioning based on wireless sensor network, it is characterized in that described system comprises 2 wireless sensor network nodes and 1 the data management node that is linked into each observation station, be arranged on 1 aggregation node on each power distribution network branch road, 2 wireless sensor network nodes of each observation station link to each other by the data management node of communication with this observation station of access, and each data management node links to each other with aggregation node on this power distribution network branch road by communication;
2 wireless sensor network nodes that are linked into each observation station are respectively applied to measure the current data of the two-phase circuit of this observation station, and the data that record are sent to the data management node of the same observation station of access;
The data management node that is linked into each observation station is used for measuring the current data of the other phase circuit of this observation station, and receives the current data of the two-phase circuit of 2 wireless sensor network nodes transmissions that access same observation station; Also be used for the current data addition with the three-phase line of this observation station, obtain the zero-sequence current of observation station, and when the zero-sequence current of this observation station surpasses setting threshold, the zero-sequence current of this observation station is sent to aggregation node;
Aggregation node is used for receiving the zero-sequence current of adjacent observation station, and the zero-sequence current phase place of two adjacent observation stations of comparison, if the zero-sequence current phase differential of two adjacent observation stations is 180 °, judge that then singlephase earth fault occurs between these two adjacent observation stations.
Described wireless sensor network node comprises current transformer, signal condition unit, processor, power amplifier, Power supply module and wireless communication module; Current transformer, signal condition unit, processor, power amplifier link to each other in turn with wireless communication module; The Power supply module links to each other with processor;
One phase circuit of described current transformer access observation station is used for gathering the momentary current data on this phase circuit;
Described signal condition unit is used for the momentary current data that gather are carried out signal condition;
Described processor is used for the current data after the conditioning is carried out the A/D sampling, and stores;
Described power amplifier is used for the circuit data of A/D sampling is amplified processing;
The current data that described wireless communication module is used for will amplifying after processing sends to the data management node;
Described Power supply module is used to processor that work capacity is provided.
The present invention can determine single-phase grounding fault point position rapidly and accurately, and fault transient component and the steady-state component of eliminating reality easily loaded, the impact of transformer non-ideal characteristic; And, adopt cheaply wireless sensor network node, can also greatly save system cost.
Description of drawings
Fig. 1 is the arrangement figure of wireless sensor network node on distribution line;
Fig. 2 calculates the zero-sequence current schematic diagram;
Fig. 3 is the wireless sensor network node structural drawing.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that, following explanation only is exemplary, rather than in order to limit the scope of the invention and to use.
In three-phase radial distribution networks as shown in Figure 1, every the distance (usually at 500m) of setting observation station is set.Every circuit branch arranges an aggregation node.In each observation station, access respectively wireless sensor network node on A, B, the C three-phase line, the little box indicating among Fig. 1 is installed in the wireless sensor network node on the power circuit, numeral observation period.At each observation station place, the wireless sensor network node on A, B, the C three-phase line is in turn as the data management node.Can select first the wireless sensor network node on the A phase circuit to serve as the data management node, when the wireless sensor network node on the A phase circuit breaks down, served as by the wireless sensor network node of B phase again, served as by the wireless senser of C phase again when the wireless sensor network node on the B phase circuit breaks down.
Wireless sensor network node is responsible for gathering the current data of every phase, and mails to the data management node.The task of data management node not only gathers this phase current data, and receives the current data from other two-phases, and it is carried out aggregation process.The 1st observation station, the three-phase wireless sensor network node records A, B, the C three-phase current is respectively I1_A, I1_B and I1_C.The wireless sensor network node that accesses mutually as A is during as the data management node, and the B phase sends to the data management node with C node mutually with current value I 1_B and I1_C.At the data management node, as shown in Figure 2, addition can get zero-sequence current value, i.e. I01=I1_A+I1_B+I1_C to the three-phase electricity flow valuve.Equally, in observation station 2, to three-phase current I2_A, the I2_B and the I2_C addition that record, the zero-sequence current value that can get observation station 2 places is I02=I2_A+I2_B+I2_C.By that analogy, can get the zero-sequence current at each observation station place.After the data management node calculates the zero-sequence current of residing observation station, whether the zero-sequence current of judging residing observation station surpasses setting threshold, if surpass setting threshold, then the data management node sends to aggregation node with the zero-sequence current of residing observation station, and triggering the data management node of adjacent observation station, the data management node that makes adjacent observation station is sent to aggregation node with the zero-sequence current of adjacent observation station;
Aggregation node is collected the information of the data management node of each observation station, issues the fault management center after gathering.Aggregation node can be served as by the data management node at observation station place, except having data management function, the most important thing is to have the GSM/GPRS module, and the mode by GPRS links to each other with the fault management center.In the neutral non-effective grounding power distribution network, when the phase phasic difference of the zero-sequence current of two adjacent observation stations that receive when aggregation node is 180 °, can determine that then singlephase earth fault necessarily occurs between these two adjacent observation stations.After judging that singlephase earth fault occurs, aggregation node is to the position of fault management center report earth fault generation.If aggregation node finds that the phase place of all zero-sequence currents in this zone is identical, the zero-sequence current phase information of all observation stations will be uploaded.At the fault management center, according to the topological structure of power distribution network, search the observation station of 180 ° of the zero-sequence current phase phasic differences of adjacent observation station, and then definite fault zone.
Wireless sensor network node as shown in Figure 2, its master controller chip adopts the CC2530 of TI company, this wireless sensor network node carries out the A/D sampling by the momentary current data on the current transformer collection distribution line through giving CC2530 after the signal condition module.The CC2530 processor is responsible for controlling the operation of whole sensor node, the data that the data that Storage and Processing itself gathers and other node are sent; Power amplifier (PA) carries out power amplification to the data that CC2530 will send, and the multiple of CC2530 energy power ratio control amplifier; The energy supply module adopts lithium battery and the powering mode of responding to the power taking complementation for sensor node provides operation required energy.
The above; only for the better embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (3)
1. one-phase earthing failure in electric distribution network localization method based on wireless sensor network is characterized in that described method comprises:
Step 1: on distribution network line, every setpoint distance an observation station is set, at each power distribution network branch road an aggregation node is set;
Step 2: at each observation station place, access wireless sensor network node at three-phase line respectively, three wireless sensor network nodes gather respectively the current data of three-phase line;
Step: 3: from three wireless sensor network nodes of each observation station, select a wireless sensor network node as the data management node; For each observation station, wireless sensor network node sends the current data of the corresponding phase circuit that gathers separately to the data management node, thereby obtains the current data of the three-phase line of each observation station;
Step 4: the data management node of each observation station obtains the zero-sequence current of each observation station to the current data addition of the three-phase line of residing observation station;
Step 5: the data management node judges whether the zero-sequence current of residing observation station surpasses setting threshold, if surpass setting threshold, then execution in step 6; Otherwise the wireless sensor network node that accesses on the three-phase line of each observation station continues to gather the current data of three-phase line;
Step 6: the data management node sends to aggregation node with the zero-sequence current of residing observation station, and triggers the data management node of adjacent observation station, and the data management node that makes adjacent observation station is sent to aggregation node with the zero-sequence current of adjacent observation station;
Step 7: aggregation node is the zero-sequence current phase place of two adjacent observation stations relatively, if the zero-sequence current phase differential of two adjacent observation stations is 180 °, judges that then singlephase earth fault occurs between these two adjacent observation stations.
2. single-phase grounding fault positioning based on wireless sensor network, it is characterized in that described system comprises 2 wireless sensor network nodes and 1 the data management node that is linked into each observation station, be arranged on 1 aggregation node on each power distribution network branch road, 2 wireless sensor network nodes of each observation station link to each other by the data management node of communication with this observation station of access, and each data management node links to each other with aggregation node on this power distribution network branch road by communication;
2 wireless sensor network nodes that are linked into each observation station are respectively applied to measure the current data of the two-phase circuit of this observation station, and the data that record are sent to the data management node of the same observation station of access;
The data management node that is linked into each observation station is used for measuring the current data of the other phase circuit of this observation station, and receives the current data of the two-phase circuit of 2 wireless sensor network nodes transmissions that access same observation station; Also be used for the current data addition with the three-phase line of this observation station, obtain the zero-sequence current of observation station, and when the zero-sequence current of this observation station surpasses setting threshold, the zero-sequence current of this observation station is sent to aggregation node;
Aggregation node is used for receiving the zero-sequence current of adjacent observation station, and the zero-sequence current phase place of two adjacent observation stations of comparison, if the zero-sequence current phase differential of two adjacent observation stations is 180 °, judge that then singlephase earth fault occurs between these two adjacent observation stations.
3. system according to claim 1 is characterized in that described wireless sensor network node comprises current transformer, signal condition unit, processor, power amplifier, Power supply module and wireless communication module; Current transformer, signal condition unit, processor, power amplifier link to each other in turn with wireless communication module; The Power supply module links to each other with processor;
One phase circuit of described current transformer access observation station is used for gathering the momentary current data on this phase circuit;
Described signal condition unit is used for the momentary current data that gather are carried out signal condition;
Described processor is used for the current data after the conditioning is carried out the A/D sampling, and stores;
Described power amplifier is used for the circuit data of A/D sampling is amplified processing;
The current data that described wireless communication module is used for will amplifying after processing sends to the data management node;
Described Power supply module is used to processor that work capacity is provided.
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Cited By (16)
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| CN103529357A (en) * | 2013-08-02 | 2014-01-22 | 吉林省电力有限公司长春供电公司 | Method for determining section of single-phase ground fault of 10kV power distribution system |
| CN103743998A (en) * | 2013-12-23 | 2014-04-23 | 华北电力大学（保定） | Cross correlation coefficient-based distribution network single-phase grounding fault positioning method and system |
| CN104076249A (en) * | 2014-07-15 | 2014-10-01 | 国家电网公司 | Three-phase three-winding transformer one-phase ground fault coverage diagnostic method |
| CN104375055A (en) * | 2013-08-15 | 2015-02-25 | 通用电气公司 | Fault locating device and method of power distribution network |
| CN104569729A (en) * | 2015-01-29 | 2015-04-29 | 深圳市科陆电子科技股份有限公司 | Fault indicator based power distribution network single-phase earth fault detection method and fault indicator based power distribution network single-phase earth fault detection system |
| CN105388391A (en) * | 2014-08-28 | 2016-03-09 | 通用电气公司 | systems and methods for identifying fault location using distributed communication |
| CN106997020A (en) * | 2017-03-20 | 2017-08-01 | 中国石油大学(华东) | A kind of cable distributor track network fault positioning method based on forward-order current fault component phase bit comparison |
| CN107167709A (en) * | 2017-07-07 | 2017-09-15 | 吉林大学 | A kind of electric network fault localization method and alignment system |
| CN107991579A (en) * | 2017-11-27 | 2018-05-04 | 国网山东省电力公司聊城供电公司 | A kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system, localization method and its realize system |
| CN109713654A (en) * | 2019-02-13 | 2019-05-03 | 云南电网有限责任公司电力科学研究院 | The positioning and guard method of distributed flexible ground fault based on controllable voltage source |
| CN109844549A (en) * | 2016-10-11 | 2019-06-04 | 国际商业机器公司 | Calculating equipment and/or non-volatile memory device based on heat analysis reconfigure |
| CN112083284A (en) * | 2020-09-07 | 2020-12-15 | 昆明理工大学 | Method for identifying fault section and fault branch of collecting line of wind power plant based on zero sequence current phase difference |
| CN112415325A (en) * | 2020-10-22 | 2021-02-26 | 中国矿业大学 | Single-phase earth fault section identification method based on edge calculation |
| CN112986754A (en) * | 2021-05-11 | 2021-06-18 | 国网江西省电力有限公司电力科学研究院 | Small current grounding system fault identification method and device based on data driving |
| CN113109733A (en) * | 2021-03-23 | 2021-07-13 | 兰州资源环境职业技术学院 | Overhead cable short circuit grounding fault detection system based on wireless sensor network |
| CN116165427A (en) * | 2023-02-17 | 2023-05-26 | 山东国信电力科技有限公司 | Power distribution low-voltage transformer area topology signal identification circuit and identification method |
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| CN103529357A (en) * | 2013-08-02 | 2014-01-22 | 吉林省电力有限公司长春供电公司 | Method for determining section of single-phase ground fault of 10kV power distribution system |
| CN104375055B (en) * | 2013-08-15 | 2017-05-17 | 通用电气公司 | Fault locating device and method of power distribution network |
| CN104375055A (en) * | 2013-08-15 | 2015-02-25 | 通用电气公司 | Fault locating device and method of power distribution network |
| CN103743998A (en) * | 2013-12-23 | 2014-04-23 | 华北电力大学（保定） | Cross correlation coefficient-based distribution network single-phase grounding fault positioning method and system |
| CN104076249A (en) * | 2014-07-15 | 2014-10-01 | 国家电网公司 | Three-phase three-winding transformer one-phase ground fault coverage diagnostic method |
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| CN104569729A (en) * | 2015-01-29 | 2015-04-29 | 深圳市科陆电子科技股份有限公司 | Fault indicator based power distribution network single-phase earth fault detection method and fault indicator based power distribution network single-phase earth fault detection system |
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| CN106997020B (en) * | 2017-03-20 | 2020-01-07 | 中国石油大学(华东) | Cable distribution looped network fault positioning method based on positive sequence current fault component phase comparison |
| CN107167709A (en) * | 2017-07-07 | 2017-09-15 | 吉林大学 | A kind of electric network fault localization method and alignment system |
| CN107991579A (en) * | 2017-11-27 | 2018-05-04 | 国网山东省电力公司聊城供电公司 | A kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system, localization method and its realize system |
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| CN112083284A (en) * | 2020-09-07 | 2020-12-15 | 昆明理工大学 | Method for identifying fault section and fault branch of collecting line of wind power plant based on zero sequence current phase difference |
| CN112083284B (en) * | 2020-09-07 | 2021-10-12 | 昆明理工大学 | Method for identifying fault section and fault branch of current collecting line of wind power plant |
| CN112415325A (en) * | 2020-10-22 | 2021-02-26 | 中国矿业大学 | Single-phase earth fault section identification method based on edge calculation |
| CN113109733A (en) * | 2021-03-23 | 2021-07-13 | 兰州资源环境职业技术学院 | Overhead cable short circuit grounding fault detection system based on wireless sensor network |
| CN113109733B (en) * | 2021-03-23 | 2023-12-15 | 兰州资源环境职业技术学院 | Overhead cable short-circuit ground fault detection system based on wireless sensor network |
| CN112986754A (en) * | 2021-05-11 | 2021-06-18 | 国网江西省电力有限公司电力科学研究院 | Small current grounding system fault identification method and device based on data driving |
| CN116165427A (en) * | 2023-02-17 | 2023-05-26 | 山东国信电力科技有限公司 | Power distribution low-voltage transformer area topology signal identification circuit and identification method |
| CN116165427B (en) * | 2023-02-17 | 2023-08-11 | 山东国信电力科技有限公司 | Power distribution low-voltage transformer area topology signal identification circuit and identification method |
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Application publication date: 20130213 |