CN205157709U - Single -phase ground connection route selection system of dispatch end undercurrent - Google Patents
Single -phase ground connection route selection system of dispatch end undercurrent Download PDFInfo
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- CN205157709U CN205157709U CN201520967486.6U CN201520967486U CN205157709U CN 205157709 U CN205157709 U CN 205157709U CN 201520967486 U CN201520967486 U CN 201520967486U CN 205157709 U CN205157709 U CN 205157709U
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Abstract
The application discloses single -phase ground connection route selection system of dispatch end undercurrent, this system are applied to the small current neutral grounding sys tem of neutral point through arc suppressing coil ground connection. This system at first monitors the zero -sequence voltage of respectively being qualified for the next round of competitions, judges the earth fault that is qualified for the next round of competitions when taking place the boosting, obtains the zero sequence current who respectively is qualified for the next round of competitions this moment again to carry out the comparison to each zero sequence current, therefrom confirm the biggest zero sequence current, then judge the biggest being qualified for the next round of competitions of zero sequence current and be qualified for the next round of competitions for the trouble that takes place earth fault. Because this system can have the trouble that breaks down through zero -sequence voltage and zero sequence current snap judgments and is qualified for the next round of competitions, and need not to carry out manual work through the method of " draw send " and investigate, so can make the troubleshooting who transports the dimension personnel and can quicken the circuit to can reduce to have a power failure the economic loss that causes, guaranteed the continuous power supply to the power consumer.
Description
Technical field
The application relates to technical field of electric power, more particularly, relates to a kind of dispatching terminal small area analysis single-phase grounding selecting system.
Background technology
Along with the development of electrical network, the safe operation of electrical network becomes the focus of concern, and any primary fault of electric system will inevitably cause the loss that cannot estimate, and how to process the information of acquisition accurately, fix a breakdown in time, become the key point that power system stability is run.In addition people have higher requirement to the safe operation of electrical network and the reliability of power supply, when electric system is broken down, need staff to locate accurately, recover the stable operation of electrical network by the fastest speed.
In China, 6 ~ 35kV medium voltage distribution network system major part adopts neutral point not direct grounding way, is called small current neutral grounding system.The probability that singlephase earth fault occurs in power distribution network accounts for 80% of fault total amount.In small current neutral grounding system, single-phase earthing threatens little to electrical network, can continue operation 1 ~ 2h.Along with the development of power grid construction, power distribution network transmission line of electricity is more and more longer, and cable application gets more and more, and the ground capacitance of circuit is increased.If only adopt isolated neutral mode, then the short-circuit current increase of trouble spot can be unfavorable for arc extinguishing, and the threat larger to apparatus insulated formation.So the distribution network system neutral point mode of connection of China has: isolated neutral mode, Neutral Point Through Low Resistance mode, neutral by arc extinction coil grounding mode.The electric current when access of arc suppression coil and resistance reduces one-way earth fault, also reduces and utilizes these quantity of information to select sensitivity and the selectivity of faulty line device, have impact on the reliability of power supply.
Present stage, during small current neutral grounding system generation singlephase earth fault, the main methods of regulation and control end is that each outlet on the abnormal bus of relevant voltage is drawn in examination.According to earthing wire-selecting table, according to " drawing one to send one ", the principle of carrying out one by one, determine faulty line.In this process, the repeatedly repetitive operation of uncontinuity and the power equipment switch that power consumer is powered certainly will be caused.And it is large by the impact of the factor such as skill level, the smooth level of open3000 system cloud gray model, the unimpeded degree of information channel of human users.Along with society and expanding economy, people require higher to the continuity of electric power supply, how when system generation single-phase earthing, determine faulty line fast and accurately, to the eliminating accelerating line fault, improve operational reliability, reduce because have a power failure the mixed economy loss caused, ensure the continuous power supply to power consumer, have a very important role.
Utility model content
In view of this, the application provides a kind of dispatching terminal small area analysis single-phase grounding selecting method and system, for determining the faulty line in the small current neutral grounding system of neutral by arc extinction coil grounding rapidly and accurately, process as early as possible according to determination result to enable operation maintenance personnel, to reduce the economic loss caused that has a power failure, ensure the continuous power supply to power consumer.
To achieve these goals, the existing scheme proposed is as follows:
A kind of dispatching terminal small area analysis single-phase grounding selecting system, is applied to the small current neutral grounding system of neutral by arc extinction coil grounding, comprises:
For obtaining the residual voltage acquisition device of the residual voltage of each outlet of described small current neutral grounding system;
For when described residual voltage raises, obtain the zero-sequence current acquisition device of the zero-sequence current of each described outlet of described small current neutral grounding system;
Being connected with described residual voltage acquisition device, described zero-sequence current acquisition device respectively, for comparing each described zero-sequence current, therefrom determining that the maximum described outlet of described zero-sequence current is the processor of described fault outlet.
Optionally, described residual voltage acquisition device comprises multiple voltage sensor.
Optionally, described zero-sequence current acquisition device comprises multiple current sensor.
Optionally, also comprise:
Be connected with described module, for storing the data memory module of described zero-sequence current and described residual voltage.
Optionally, also comprise:
Be connected with described processor, for sending the telemechanical communication module of the failure message of the described fault outlet of reflection to the master control system of control station.
Optionally, also comprise:
Be connected with described processor, for showing the display module of the failure message reflecting described fault outlet.
As can be seen from above-mentioned technical scheme, this application discloses a kind of dispatching terminal small area analysis single-phase grounding selecting system, this system is applied to the small current neutral grounding system of neutral by arc extinction coil grounding.First this system monitors the residual voltage of each outlet, outlet earth fault is judged when voltage occurring and raising, now obtain the zero-sequence current of each outlet again, and each zero-sequence current is compared, therefrom determine maximum zero-sequence current, then judge that the maximum outlet of zero-sequence current is as the fault outlet that earth fault occurs.Because native system can judge the fault outlet of breaking down fast by residual voltage and zero-sequence current, and manually investigate without the need to the method by " drawing to give ", therefore, it is possible to enable operation maintenance personnel accelerate the failture evacuation of circuit, thus can reduce to have a power failure cause economic loss, ensure that continuous power supply to power consumer.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structured flowchart of a kind of dispatching terminal small area analysis single-phase grounding selecting system that Fig. 1 provides for the embodiment of the present application;
The structured flowchart of a kind of dispatching terminal small area analysis single-phase grounding selecting system that Fig. 2 provides for another embodiment of the application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Embodiment one
The structured flowchart of a kind of dispatching terminal small area analysis single-phase grounding selecting system that Fig. 1 provides for the embodiment of the present application.This system is applied to the small current neutral grounding system of neutral by arc extinction coil grounding.Specifically comprise residual voltage acquisition device 10, zero-sequence current acquisition device 20 and processor 30, processor 30 is connected with residual voltage acquisition device 10, zero-sequence current acquisition device 20 respectively.
Residual voltage acquisition device 10, for when small current neutral grounding system runs, gathers the residual voltage of each outlet be connected on bus at any time and outputs to processor 30.Be specially and be judged to be that residual voltage raises when residual voltage is more than or equal to 15 volts and is continued above 1 minute.
Zero-sequence current acquisition device 20 is for gathering the zero-sequence current of each outlet and outputting to processor 30.
When residual voltage raises, to start to raise the zero-sequence current that route protection unit that the moment is connected with bus for fault moment begins through gathers each cycle of each outlet 2 ~ 3.
Processor 30 is for sorting the multiple zero sequence electric power obtained, and the zero-sequence current that therefrom current value is maximum, in general, the maximum outlet of zero-sequence current is the fault outlet of breaking down.
As can be seen from technique scheme, present embodiments provide a kind of dispatching terminal small area analysis single-phase grounding selecting system, this system is applied to small current neutral grounding system.First this system monitors the residual voltage of each outlet, outlet earth fault is judged when voltage occurring and raising, now obtain the zero-sequence current of each outlet again, and therefrom search the maximum zero-sequence current of current value, and judge that the maximum outlet of zero-sequence current is as the fault outlet of breaking down.Because native system can judge the fault outlet of breaking down fast by residual voltage and zero-sequence current, and manually investigate without the need to the method by " drawing to give ", therefore, it is possible to enable operation maintenance personnel accelerate the failture evacuation of circuit, thus can reduce to have a power failure cause economic loss, ensure that continuous power supply to power consumer.
Embodiment two
The structured flowchart of a kind of dispatching terminal small area analysis single-phase grounding selecting system that Fig. 2 provides for another embodiment of the application.
As shown in Figure 2, the present embodiment has set up data storage device 40, telemechanical communicator 50 and display device 60 on the basis of a upper embodiment.Processor 30 is connected with data storage device 40, telemechanical communicator 50, display device 60 respectively.
Memory storage 40 is for storing the zero-sequence current and residual voltage that detect.Telemechanical communicator 50 is for sending the failure message of faults outlet to the master control system of control station.Display device 60, for showing the failure message of faults outlet on the spot, can make operation maintenance personnel directly obtain failure message.
In addition, native system also comprises the working power (not shown) for powering to each operational module.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the application.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. a dispatching terminal small area analysis single-phase grounding selecting system, is applied to the small current neutral grounding system of neutral by arc extinction coil grounding, it is characterized in that, comprising:
For obtaining the residual voltage acquisition device of the residual voltage of each outlet of described small current neutral grounding system;
For when described residual voltage raises, obtain the zero-sequence current acquisition device of the zero-sequence current of each described outlet of described small current neutral grounding system;
Being connected with described residual voltage acquisition device, described zero-sequence current acquisition device respectively, for comparing each described zero-sequence current, therefrom determining that the maximum described outlet of described zero-sequence current is the processor of described fault outlet.
2. dispatching terminal small area analysis single-phase grounding selecting system as claimed in claim 1, it is characterized in that, described residual voltage acquisition device comprises multiple voltage sensor.
3. dispatching terminal small area analysis single-phase grounding selecting system as claimed in claim 1, it is characterized in that, described zero-sequence current acquisition device comprises multiple current sensor.
4. the dispatching terminal small area analysis single-phase grounding selecting system as described in any one of claims 1 to 3, is characterized in that, also comprise:
Be connected with described module, for storing the data memory module of described zero-sequence current and described residual voltage.
5. dispatching terminal small area analysis single-phase grounding selecting system as claimed in claim 4, is characterized in that, also comprise:
Be connected with described processor, for sending the telemechanical communication module of the failure message of the described fault outlet of reflection to the master control system of control station.
6. dispatching terminal small area analysis single-phase grounding selecting system as claimed in claim 4, is characterized in that, also comprise:
Be connected with described processor, for showing the display module of the failure message reflecting described fault outlet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520967486.6U CN205157709U (en) | 2015-11-27 | 2015-11-27 | Single -phase ground connection route selection system of dispatch end undercurrent |
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| CN201520967486.6U CN205157709U (en) | 2015-11-27 | 2015-11-27 | Single -phase ground connection route selection system of dispatch end undercurrent |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167692A (en) * | 2017-05-22 | 2017-09-15 | 南方电网科学研究院有限责任公司 | Fault line selection device and method for arc suppression coil grounding system |
| CN107843809A (en) * | 2017-10-30 | 2018-03-27 | 国网湖南省电力公司 | The earthing wire-selecting method differentiated based on zero sequence |
| CN109031044A (en) * | 2018-08-09 | 2018-12-18 | 国网浙江省电力有限公司温州供电公司 | A kind of dispatching terminal substation low current single-phase earthing automatic route selection method |
| CN113156331A (en) * | 2021-01-07 | 2021-07-23 | 胜业电气股份有限公司 | Ground fault line selection method based on discrete Frechettdistance |
| WO2023060705A1 (en) * | 2021-10-15 | 2023-04-20 | 贵州电网有限责任公司 | Bus/line grounding line selection alternate removal method based on scada data |
-
2015
- 2015-11-27 CN CN201520967486.6U patent/CN205157709U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167692A (en) * | 2017-05-22 | 2017-09-15 | 南方电网科学研究院有限责任公司 | Fault line selection device and method for arc suppression coil grounding system |
| CN107167692B (en) * | 2017-05-22 | 2019-06-04 | 南方电网科学研究院有限责任公司 | Fault line selection device and method for arc suppression coil grounding system |
| CN107843809A (en) * | 2017-10-30 | 2018-03-27 | 国网湖南省电力公司 | The earthing wire-selecting method differentiated based on zero sequence |
| CN109031044A (en) * | 2018-08-09 | 2018-12-18 | 国网浙江省电力有限公司温州供电公司 | A kind of dispatching terminal substation low current single-phase earthing automatic route selection method |
| CN109031044B (en) * | 2018-08-09 | 2024-02-02 | 国网浙江省电力有限公司温州供电公司 | Small-current single-phase grounding automatic line selection method for dispatching-end transformer substation |
| CN113156331A (en) * | 2021-01-07 | 2021-07-23 | 胜业电气股份有限公司 | Ground fault line selection method based on discrete Frechettdistance |
| WO2023060705A1 (en) * | 2021-10-15 | 2023-04-20 | 贵州电网有限责任公司 | Bus/line grounding line selection alternate removal method based on scada data |
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