CN105759164B - A kind of broken neutral line detecting and localization method - Google Patents
A kind of broken neutral line detecting and localization method Download PDFInfo
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- CN105759164B CN105759164B CN201610202374.0A CN201610202374A CN105759164B CN 105759164 B CN105759164 B CN 105759164B CN 201610202374 A CN201610202374 A CN 201610202374A CN 105759164 B CN105759164 B CN 105759164B
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000004807 localization Effects 0.000 title claims abstract description 7
- 239000004020 conductor Substances 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000012423 maintenance Methods 0.000 claims abstract description 3
- 230000001131 transforming effect Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000007405 data analysis Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
Abstract
A kind of broken neutral line detecting and localization method, the method is by comparing distribution low-voltage side three-phase current unbalance rate amplitude of variation, distribution low-voltage side phase voltage value and user side magnitude of voltage size, according to three-phase current unbalance rate at different moments and the amplitude of variation size of nearly three days judges whether the neutral conductor breaks；Broken neutral line position is positioned according to taiwan area supply network topological structure, the terminal temperature difference voltage of different sections and distribution low-voltage side voltage comparable situation, GIS figures, and will determine that result is pushed to operation maintenance personnel, so as to timely processing warning information and carry out relevant repairing work.The method of the present invention is applicable in the detecting of low pressure broken neutral line and fault location.
Description
Technical field
The present invention relates to a kind of detecting of broken neutral line and localization method, belong to low-voltage circuit detection technique field.
Background technology
10kV distribution transformer winding connecting group grades are generally Dyn11 and Yyn0 types, usually based on Dyn11 types, are mostly
TT wiring patterns, and rural area low-voltage power supply system is essentially three-phase four-wire system, current supply circuit of the neutral conductor as single-phase user,
Three phase unbalance current is flowed through at connecting node, maintains neutral point potential not shift.As line operation environment complicates,
Broken neutral line happens occasionally, if the neutral conductor breaks, it would be possible to so that certain phase voltage is raised and lowered, causes user to set
Standby damage or can not normal electricity consumption, influence power supply reliability.
As intelligent electric meter covering surface constantly expands, low and medium voltage distribution network operational monitoring information will be more complete and rich
Richness, it is how possible as one kind to low pressure broken neutral line detecting fault and positioning using these magnanimity informations, so as to send out in time
Existing broken neutral line failure, improves power supply reliability and good service quality, reduces customer outage hours and loss.
The content of the invention
It is an object of the present invention to provide a kind of broken neutral line based on distribution low-voltage side and intelligent electric meter electric quantity information
Detecting and localization method, to find low pressure broken neutral line failure and abort situation in time, reduce trouble shooting time and use
Family loss, improve power supply reliability.
The technical scheme is that according to distribution transformer low side outlets phase voltage value, phase current values, low-voltage customer
The information content situations of change such as network topological diagram, user side magnitude of voltage judge low pressure broken neutral line failure, are determined by generalized information system
Position abort situation.
The method of the present invention step is as follows：
（1）Detect at distribution transformer low side outlets（Concentrator）A, each phase voltage of B, C and electric current, and calculate corresponding
Three-phase imbalance rate, the sample frequency per adjacent 2 points are identical；By result of calculation compared with the unbalance factor of last moment；
（2）Judge that broken string is possible according to comparative result, its judgment basis includes：First, distribution transformer outlet side voltage is just
Often（220±10%）；Second, the 2nd three-phase current unbalance rate of contrast present moment and the 1st three-phase current of previous moment
Unbalance factor, if the amplitude of variation of Dyn11 type distribution transformings is 40%~50% or the amplitude of variation of Yyn0 type distribution transformings is 50%~54%；
Third, compare the 3rd three-phase current unbalance rate of subsequent time, while by the same of three days nearly with the taiwan area of the 2nd unbalance factor
The value at one moment is compared, and the 3rd unbalance factor and the 2nd unbalance factor are relatively（±10%）, and the 2nd imbalance
Rate differs 40%~50% compared with history value；Meet the above three condition, then judge that the low pressure neutral conductor breaks.
（3）According to intelligent electric meter installation site, fiery point is taken with reference to user, it is inquiry taiwan area low-pressure side voltage, representative
User side（Such as head end, middle-end and terminal temperature difference）Magnitude of voltage, by its magnitude of voltage compared with outlet side magnitude of voltage, according to than
Broken string scope, and synchronous taiwan area GIS secondary network topological diagrams are progressively reduced compared with result, analyzes broken position；
（4）By above-mentioned data analysis, corresponding taiwan area low pressure broken neutral line fault warning information is pushed to O＆M
Administrative staff, so as to timely processing warning information and carry out relevant repairing work.
The phase voltage value and current value are that after being gathered by taiwan area concentrator, electricity consumption is uploaded to by wireless communications mode
Information acquisition system, monitoring system of distribution transformer extract related distribution transforming and taiwan area user related data, distribution transformer monitoring by data-interface
System is filtered out in the presence of abnormal taiwan area according to rule is studied and judged.The distribution transforming winding connecting group grade is believed by PMS2.0 accounts
Breath is associated acquisition.
The invention has the advantages that by distribution low-voltage side and intelligent electric meter electrical quantity effective information to the low pressure neutral conductor
Broken string is detected and positioned, and can not only be realized and be carried out early warning to low pressure broken neutral line online, and according to network topology
Figure and generalized information system position failure, effectively reduce the user caused by broken neutral line failure and lose, and it is reliable to improve power supply
Property and good service.
The method of the present invention is applicable in the detecting of low pressure broken neutral line and fault location.
Brief description of the drawings
Fig. 1 is detected for low pressure broken neutral line and positioning flow figure；
Fig. 2 is low-voltage circuit typical case's power supply line chart.
Embodiment
The present invention is the synthesis by comparing distribution low-voltage side outlet phase voltage, phase current, unbalance factor and user side voltage
Judge broken neutral line and break point position.
To make the above-mentioned detection method of the present invention more obvious understandable, carried out specifically below in conjunction with drawings and examples
It is bright.Fig. 1 show the flow chart of the embodiment of low pressure broken neutral line, and specific implementation step is as follows：
1st, 2 points of different time at distribution transformer low side outlets are detected（Concentrator）A, each phase voltage of B, C, three-phase
Current imbalance rate, sample frequency are one point of collection in every 5 minutes.
2nd, judge whether phase voltage is normal, in the range of 220 ± 10%.If exception occurs in phase voltage, fortune is directly pushed to
Dimension personnel verify；If phase voltage is normal, adjacent 2: 0 1st three-phase current unbalance rates and the 2nd three-phase current are calculated not
The three-phase imbalance rate amplitude of variation of balanced ratio, amplitude overrun（The excursion of Dyn11 type distribution transformings is set as 40%~
50%th, the excursion of Yyn0 types distribution transforming is set as 50%~54%）, continue to gather the three-phase current unbalance rate of subsequent time.
3rd, by the 3rd three-phase current unbalance rate of collection compared with the 2nd acquisition rate, while by the 2nd unbalance factor
Compared with the value of the synchronization of three days nearly with the taiwan area.If the 3rd unbalance factor and the 2nd unbalance factor are relatively
（±10%）, and the 2nd unbalance factor differs larger compared with history value（40%~54%）, then broken neutral line is judged；As being discontented with
Sufficient above-mentioned condition, then terminate this time to judge.
4th, by above three step, draw broken neutral line failure, then start taiwan area customer power supply network topological diagram and
GIS schemes, and gathers to have and represent latter end user's intelligent electric meter magnitude of voltage such as head end, middle-end, end.
5th, by user's magnitude of voltage of collection compared with each phase voltage in distribution low-voltage side, if the end such as head end, middle-end, end
Section user's voltage is all higher than the corresponding voltage in distribution low-voltage side, then breaks with the neutral conductor for fading to head end user segment, Fig. 2
It is I sections shown；If head end latter end user's voltage is normal, it is corresponding that latter end user's voltage such as middle-end, end is all higher than distribution low-voltage side
Voltage, then head end to the middle part neutral conductor break, II shown in Fig. 2 sections；If head end, middle-end latter end user's voltage are normal,
End latter end user voltage is more than the corresponding voltage in distribution low-voltage side, then middle part to the end segment neutral conductor is broken, Fig. 2 institutes
Show III sections.
6th, by the 5th judging result, O＆M unit operation maintenance personnel is pushed to, so as to timely processing warning information and carries out phase
The repairing work of pass.
The specific embodiment of above application is only that the principle of the present invention is illustrated, instead of all the embodiments, skill
Art personnel can divide broken string section according to on-site actual situations, quickly to search broken position.
Claims (2)
1. a kind of broken neutral line detecting and localization method, it is characterised in that the method is by comparing distribution low-voltage side three-phase
Current imbalance rate amplitude of variation, distribution low-voltage side phase voltage value and user side magnitude of voltage size, according to three-phase current unbalance
Rate is at different moments and the amplitude of variation size of nearly three days judges whether the neutral conductor breaks；According to taiwan area supply network topology
Structure, the terminal temperature difference voltage of different section and distribution low-voltage side voltage comparable situation, GIS figures position broken neutral line position
Put, and will determine that result is pushed to operation maintenance personnel, so as to timely processing and carry out relevant repairing work；The method step is such as
Under：
(1) each phase voltage of distribution low-voltage side A, B, C and electric current are detected, and calculates corresponding three-phase current unbalance rate, per adjacent
2 points of sample frequency is identical；And by result of calculation compared with the unbalance factor of last moment；
(2) judge that broken string is possible according to comparative result, its main foundation includes：First, each phase phase voltage of distribution transforming is normal；Second,
Contrast the 2nd three-phase current unbalance rate of present moment and the 1st three-phase current unbalance rate of previous moment, Dyn11 types
The amplitude of variation of distribution transforming is 40%~50% or the amplitude of variation of Yyn0 type distribution transformings is 50%~54%；Third, compare lower a period of time
The 3rd three-phase current unbalance rate carved, while by the 2nd three-phase current unbalance rate and the taiwan area synchronization of nearly three days
Value be compared, the 3rd three-phase current unbalance rate and the 2nd three-phase current unbalance rate excursion be no more than ±
10%；, and the 2nd three-phase current unbalance rate differs 40%~50% compared with the value of the taiwan area synchronization of nearly three days；
Meet the above three condition, then judge that the low pressure neutral conductor breaks；
(3) according to intelligent electric meter installation site, fiery point is taken with reference to user, it is inquiry distribution low-voltage side phase voltage, representative
Head end, middle-end and terminal temperature difference side magnitude of voltage, distribution low-voltage side phase voltage value is electric with head end, middle-end and terminal temperature difference side respectively
Pressure value is compared, and broken string scope, and synchronous taiwan area GIS secondary network topological diagrams are progressively reduced according to comparative result, is analyzed
Broken position；
(4) by above-mentioned data analysis, corresponding taiwan area low pressure broken neutral line fault warning information is pushed to operation management
Personnel, so as to timely processing warning information and carry out relevant repairing work.
2. a kind of broken neutral line detecting and localization method, distribution low-voltage side phase voltage are normal according to claim 1
Scope refers to 220V ± 10%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610202374.0A CN105759164B (en) | 2016-04-05 | 2016-04-05 | A kind of broken neutral line detecting and localization method |
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| CN201610202374.0A CN105759164B (en) | 2016-04-05 | 2016-04-05 | A kind of broken neutral line detecting and localization method |
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| CN105759164A CN105759164A (en) | 2016-07-13 |
| CN105759164B true CN105759164B (en) | 2018-05-15 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107329028A (en) * | 2017-06-01 | 2017-11-07 | 国网江西省电力公司电力科学研究院 | A kind of method for detecting of Yyn0 types distribution transforming winding connecting joint open circuit |
| CN107748315B (en) * | 2017-09-14 | 2019-09-27 | 国家电网公司 | A kind of Distribution Network Failure active forewarning method |
| CN107947963A (en) * | 2017-10-24 | 2018-04-20 | 北京天元创新科技有限公司 | A kind of alarm method and device of the network topology link based on GIS map |
| CN108333400A (en) * | 2018-03-19 | 2018-07-27 | 秦峥 | A kind of intelligent metering case and its application |
| CN108667050B (en) * | 2018-05-17 | 2024-03-22 | 福建奥通迈胜电力科技有限公司 | Voltage track array-based distribution transformer low-voltage side voltage three-phase continuous unbalance evaluation method |
| CN109061394B (en) * | 2018-09-14 | 2023-10-13 | 国网江苏省电力有限公司镇江供电分公司 | Zero line breakage alarm positioning device and method for three-phase four-wire system power supply system |
| US11585866B2 (en) | 2020-07-07 | 2023-02-21 | Honeywell International Inc. | Loss of neutral voltage connection detection |
| CN112557814A (en) * | 2020-11-27 | 2021-03-26 | 云南电网有限责任公司昆明供电局 | Method for monitoring neutral line disconnection of low-voltage distribution network |
| CN113625193A (en) * | 2021-09-16 | 2021-11-09 | 应急管理部沈阳消防研究所 | Electrical fire early warning system capable of identifying multiple electrical hidden dangers |
| CN115877129B (en) * | 2022-12-13 | 2023-11-10 | 国网湖北省电力有限公司电力科学研究院 | Low-voltage distribution network neutral line disconnection comprehensive judgment method based on current and voltage |
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Effective date of registration: 20180508 Address after: 330096 No. 88, min Qiang Road, private science and Technology Park, Nanchang, Jiangxi Co-patentee after: State Grid Corporation of China Patentee after: Power Science Research Institute of Jiangxi Electric Power Co., Ltd. Address before: 330096 No. 88, min Qiang Road, private science and Technology Park, Nanchang, Jiangxi Co-patentee before: State Grid Corporation of China Patentee before: State's net Jiangxi Province Electric power Science Academe |