CN103245885B - Power failure instruction and the status monitoring logic judging method of integration - Google Patents
Power failure instruction and the status monitoring logic judging method of integration Download PDFInfo
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- CN103245885B CN103245885B CN201310153298.5A CN201310153298A CN103245885B CN 103245885 B CN103245885 B CN 103245885B CN 201310153298 A CN201310153298 A CN 201310153298A CN 103245885 B CN103245885 B CN 103245885B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000012544 monitoring process Methods 0.000 title claims abstract description 21
- 230000010354 integration Effects 0.000 title claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims description 24
- 239000010949 copper Substances 0.000 claims description 24
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 15
- 150000001879 copper Chemical class 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 6
- 238000012806 monitoring device Methods 0.000 claims description 4
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Abstract
The present invention relates to power failure instruction and the status monitoring logic judging method of integration, step (1) adopts pick-up unit to carry out, and uses MSP430F149 single-chip microcomputer, and monitoring input value is less than 5% of busbar rated voltage, opens as fault detect; (2) the current value of current transformer is converted into magnitude of voltage, every 4ms gathers once, gathers 100 times altogether; Every 10 samplings, as one group, use least square method, calculate a slope value K; (3) adjacent two K values compared, rate of change is greater than X, be then considered as current break, is true fault; Rate of change is less than X, be then considered as electric current gradual change, is the anti-power transmission fault of motor; Using single-chip microcomputer one road I/O interface as output, connect fault detector display panel, when true fault being detected, I/O exports high level, control panel report to the police; (5), by two temperature sensor access two-way A/D interfaces, export digital value by single-chip microcomputer, show temperature of cable junction by the digital display screen on panel.The breakdown judge logic of this method is changed to some extent, can mask two kinds of false faults, serve great function to the true(-)running of power distribution automation.<!--1-->
Description
Technical field
The invention belongs to distribution network technical field of automation, relate to the Real-Time Monitoring of the identification of electrical equipment fault high reliability and power equipment hidden danger, especially a kind of power failure instruction and status monitoring logic judging method of integration.
Background technology
Fault detector is as a kind of important tool of searching trouble spot on power circuit, very extensive in power industry application.Fault detector, by detecting the outlet at distribution line failure electric current indication fault place, branch and section, provides great convenience to trouble-shooting.Although developed country's power distribution automation level is very high, the major way searching distribution line failure still relies on fault detector.But there is following defect in existing fault detector: 1, the working power problem of fault detector, the working power of traditional fault detector has two kinds of modes, the first uses lithium battery to provide power supply, battery electric quantity can use 3-4 usually, exceed battery to occur tenure of use not work or the situation such as fault misdescription, bring impact to the operation of intelligent distribution network, and controller switching equipment quantity is ten hundreds of, very huge, change the thing that battery is again a time and effort consuming.The second is the current draw working power utilizing an electrical network circuit, and this kind of working power needs the electric current on a circuit can not be less than its minimum working current, but just can not use on some little lines branch and the less circuit of load.2, the mistake action and rejecting action problem of fault detector, the indicator accuracy current for short trouble can not reach 100%, misoperation sometimes, reason mainly contains: when a equipment normally runs, because the cyclization on circuit, solution also operate and the switching of the large load equipment in electricity consumption side, suddenly produce dash current sometimes, cause fault detector misoperation; B motor feedback power transmission problem, when being namely short-circuited, motor can not stall at once, transfers generator to the loop power transmission that short dot is formed by motor, or the discharge and recharge of capacitor and the stream of falling power transmission that produces, and electric current moment amplitude is very large, decays to zero subsequently.Due to previous substation exit circuit breaker trip, indicator experiences electric current again, voltage all reduces to zero, similar with fault current, causes the fault detector of non-faulting branched line or load-side to indicate wrong.This is current still indeterminable problem; The traditional fault detector of c can only detection line fault, does not possess status monitoring function.
Along with the development of intelligent grid, the status monitoring of power distribution network more and more comes into one's own, become distribution future developing trend when accident does not occur with regard to discovering device potential safety hazard, but existing fault detector can only detect the generation of fault by excess current etc., can not discovering device hidden danger., fault detector, current transformer, electrification display, the equipment such as cable end temperature measurement module construction, install loaded down with trivial details.And conventional electrical distribution automatic improving, in order to remote measurement amounts such as the electric current on detection line, voltage, temperature, needs to install numerous mutual inductor, sensor on cable.In addition, in completed region of the city to distribution network transform, the power off time of permission is very limited, need Fast Installation automation equipment, therefore install on cable, connect a large amount of mutual inductor, sensor device, not only step is very loaded down with trivial details, easily make mistakes, also take on-the-spot power off time in a large number.So existing power distribution automation renovation technique is not enough to some extent.
Summary of the invention
The object of the invention is to the weak point overcoming original technology, a kind of power failure instruction and status monitoring logic judging method method of integration are provided, electric current when this device breaks down according to cable on cable and the Changing Pattern of voltage, failure judgement position; Simultaneously bonding state monitoring concept, can some potential safety hazards of existing when running of checkout equipment.
The technical scheme that technical solution problem of the present invention adopts is:
Power failure instruction and the status monitoring logic judging method of integration, step is:
(1) adopt pick-up unit to carry out, use MSP430F149 single-chip microcomputer, operating voltage 2.7---3.6V, first by potential indicator voltage access single-chip microcomputer first via A/D input interface, monitoring input value is less than 5% of busbar rated voltage, opens as fault detect;
(2) the current value of current transformer is converted into magnitude of voltage, input single-chip microcomputer second road A/D input interface, when detecting unlatching, every 4ms gathers once, gathers 100 times altogether; Every 10 samplings, as one group, use least square method, calculate a slope value K;
(3) adjacent two K values compared, rate of change is greater than X, be then considered as current break, is true fault; Rate of change is less than X, be then considered as electric current gradual change, is the anti-power transmission fault of motor;
Using single-chip microcomputer one road I/O interface as output, connect fault detector display panel, when true fault being detected, I/O exports high level, control panel report to the police;
(5), by two temperature sensor access two-way A/D interfaces, export digital value by single-chip microcomputer, show temperature of cable junction by the digital display screen on panel.
And described monitoring device comprises copper bar, temperature sensor, current transformer, Luo-coil, band point indicator and DTU, display panel, and this copper bar is a cylindrical copper bar, and its outer rim is coated with insulation sheath; The copper bar of the upper termination switch cubicle of this copper bar, lower terminated cable also uses king bolt nut screwing clamping respectively, the upper/lower terminal of copper bar installs two temperature sensors respectively, there are a Luo-coil and a voltage sensor in middle part, this copper bar is also provided with a potential indicator, outside whole device, is set with an insulation crust.
And the temperature sensor installed of described copper bar and each coil, its wiring to be received in inner terminal block and is drawn, outside dress aviation plug.
Advantage of the present invention and good effect are:
1, this method is by secondary monitoring equipment and the integrated module of primary equipment, only simple for structure primary equipment need be electrically connected when mounted, and not need the secondary device of in-site installation complexity again, save a large amount of power failure transformation time; Solve the inconvenience that fault detector needs to change battery simultaneously, connect direct supply in station, namely can ensure that fault detector runs well for a long time.
2, the breakdown judge logic of this method is changed to some extent, can mask two kinds of false faults, serve great function to the true(-)running of power distribution automation.
3, this method solves conventional failure indicator and can only gather cable short circuit or earth fault, the hidden danger closely do not caused can not be connected by monitoring cable joint, whether can not have the generation of shelf depreciation by monitoring cable near joints, can make equipment when for breaking down, the accident that prevents is in possible trouble.
4, present method solves the difficult problem that when power distribution automation station is transformed, erecting equipment is loaded down with trivial details, solve the inconvenience of measurement, monitoring device installation, save the power failure transformation time, bring huge social and economic benefits.
Accompanying drawing explanation
Fig. 1 is parts connection diagram of the present invention.
Embodiment:
For content of the present invention, Characteristic can be understood further, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows.It should be noted that, the present embodiment is descriptive, is not determinate, can not limit protection scope of the present invention thus.
First power failure instruction and the state monitoring apparatus of the integration that monitoring method of the present invention adopts is described, comprise copper bar 10, temperature sensor 2(8), current transformer 12, Luo-coil 11, band point indicator 9 and DTU, display panel 6, this copper bar is a cylindrical copper bar, and its outer rim is coated with insulation sheath; The upper end 1 of this copper bar connects the copper bar of switch cubicle, lower end 7 connects cable, and use king bolt nut (the present embodiment accompanying drawing does not illustrate) to tighten respectively, the upper/lower terminal of copper bar installs two temperature sensors respectively, there are a Luo-coil and a voltage sensor in middle part, this copper bar is also provided with a potential indicator, outside whole device, is set with an insulation crust 3.
The temperature sensor installed of copper bar and each coil, its wiring to be received in inner terminal block 5 and is drawn, outside dress aviation plug, grafting when being convenient to in-site installation.
This device the breakdown judge logical method of taking electric current making alive compound to judge, step is:
1, MSP430F149 single-chip microcomputer 4, operating voltage 2.7---3.6V is used.First by potential indicator voltage access single-chip microcomputer first via A/D input interface, monitoring input value, is less than the 5%(busbar decompression of busbar rated voltage), open as fault detect.
2, the current value of current transformer is converted into magnitude of voltage, input single-chip microcomputer second road A/D input interface, when detecting unlatching, every 4ms gathers once, gathers 100 times altogether.Every 10 samplings, as one group, use least square method, calculate a slope value K.
3, adjacent two K values compared, rate of change is greater than X, be then considered as current break, is true fault; Rate of change is less than X, be then considered as electric current gradual change, is the anti-power transmission fault of motor.
4, using single-chip microcomputer one road I/O interface as output, connect fault detector display panel, when true fault being detected, I/O exports high level, control panel report to the police.
5, by two temperature sensor access two-way A/D interfaces, export digital value by single-chip microcomputer, show temperature of cable junction by the digital display screen on panel.
Claims (2)
1. the power failure of integration indicates and status monitoring logic judging method, it is characterized in that: adopt monitoring device to carry out, described monitoring device comprises copper bar, temperature sensor, current transformer, Luo-coil, potential indicator and DTU, display panel, this copper bar is a cylindrical copper bar, and its outer rim is coated with insulation sheath; The copper bar of the upper termination switch cubicle of this copper bar, lower terminated cable also uses king bolt nut screwing clamping respectively, the upper/lower terminal of copper bar installs two temperature sensors respectively, there are a Luo-coil and a current transformer in middle part, this copper bar is also provided with a potential indicator, be set with an insulation crust outside whole device, the step of described method is:
(1) use MSP430F149 single-chip microcomputer, operating voltage 2.7-3.6V, first by potential indicator voltage access single-chip microcomputer first via A/D input interface, monitoring input value is less than 5% of busbar rated voltage, opens as fault detect;
(2) the current value of current transformer is converted into magnitude of voltage, input single-chip microcomputer second road A/D input interface, when detecting unlatching, every 4ms gathers once, gathers 100 times altogether; Every 10 samplings, as one group, use least square method, calculate a slope value K;
(3) adjacent two K values compared, rate of change is greater than X, be then considered as current break, is true fault; Rate of change is less than X, be then considered as electric current gradual change, is the anti-power transmission fault of motor;
Using single-chip microcomputer one road I/O interface as output, connect fault detector display panel, when true fault being detected, I/O exports high level, control panel report to the police;
(5), by two temperature sensor access two-way A/D interfaces, export digital value by single-chip microcomputer, show temperature of cable junction by the digital display screen on panel.
2. the power failure of integration according to claim 1 indicates and status monitoring logic judging method, it is characterized in that: the temperature sensor that described copper bar is installed and Luo-coil, its wiring to be received in inner terminal block and is drawn, outside dress aviation plug.
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| CN108227678A (en) * | 2018-01-04 | 2018-06-29 | 广东电网有限责任公司电力科学研究院 | A kind of power distribution network no-voltage fault diagnostic method and device based on metering automation system |
| CN111679156A (en) * | 2020-07-31 | 2020-09-18 | 国网内蒙古东部电力有限公司呼伦贝尔供电公司 | Voltage fault time estimation method based on sine voltage signal slope |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1144338A (en) * | 1995-08-28 | 1997-03-05 | 北京科锐创新电力技术有限公司 | Method for detecting short-circuit fault current path and indicator |
| CN101329381A (en) * | 2008-07-28 | 2008-12-24 | 庞元俊 | Method for detecting short circuit fault with current change rate |
| CN202153249U (en) * | 2011-05-31 | 2012-02-29 | 安徽科大智能电网技术有限公司 | Overhead line fault indicator |
| CN102570611A (en) * | 2012-01-19 | 2012-07-11 | 深圳吉天广通科技有限公司 | Real-time bus working state monitoring method and intelligent bus system |
| CN202797504U (en) * | 2012-09-25 | 2013-03-13 | 江苏香江科技股份有限公司 | Multifunctional bus connector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011029480A1 (en) * | 2009-09-11 | 2011-03-17 | Abb Research Ltd | Fault current limitation in dc power transmission systems |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1144338A (en) * | 1995-08-28 | 1997-03-05 | 北京科锐创新电力技术有限公司 | Method for detecting short-circuit fault current path and indicator |
| CN101329381A (en) * | 2008-07-28 | 2008-12-24 | 庞元俊 | Method for detecting short circuit fault with current change rate |
| CN202153249U (en) * | 2011-05-31 | 2012-02-29 | 安徽科大智能电网技术有限公司 | Overhead line fault indicator |
| CN102570611A (en) * | 2012-01-19 | 2012-07-11 | 深圳吉天广通科技有限公司 | Real-time bus working state monitoring method and intelligent bus system |
| CN202797504U (en) * | 2012-09-25 | 2013-03-13 | 江苏香江科技股份有限公司 | Multifunctional bus connector |
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