CN106645870A - Tunnel cable grounding current safety alarm expert analysis method - Google Patents
Tunnel cable grounding current safety alarm expert analysis method Download PDFInfo
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- CN106645870A CN106645870A CN201611082788.0A CN201611082788A CN106645870A CN 106645870 A CN106645870 A CN 106645870A CN 201611082788 A CN201611082788 A CN 201611082788A CN 106645870 A CN106645870 A CN 106645870A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0046—Arrangements for measuring currents or voltages or for indicating presence or sign thereof characterised by a specific application or detail not covered by any other subgroup of G01R19/00
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Abstract
The invention discloses a tunnel cable grounding current safety alarm expert analysis method. The tunnel cable grounding current safety alarm expert analysis method includes setting alarm threshold values and filtering conditions in a monitoring platform; loading serial numbers and name information of monitoring terminals in the monitoring platform; dividing grounding current abnormalities into three categories including jumping abnormality, absolute value abnormality and inter-phase comparison abnormality; sequentially judging whether grounding current acquired by the monitoring terminals are abnormal or not; filtering current abnormality analysis results and alarm when all the filtering conditions are met; outputting the filtered grounding current abnormality analysis results in the monitoring platform. The tunnel cable grounding current safety alarm expert analysis method has the advantages that alarm analysis of the tunnel grounding current can be achieved, so that current abnormalities can be monitored effectively; through the set threshold values of the filtering conditions of the abnormal current, the abnormal current meeting the filtering conditions can be alarmed, false alarm is prevented and alarm accuracy is improved.
Description
Technical field
The present invention relates to the discriminatory analysis method with the presence or absence of exception of earth current, especially cable in a kind of tunnel
Earth current safe early warning specialist analytical method.
Background technology
The high-tension cable laid in electric power tunnel is the lifeblood in city.Once undesirable's illegal invasion and to earth cable
Implement destruction or larceny, temperature of cable junction will be caused to raise, and then cable connector may be caused to explode, give state's family property
Product brings heavy losses, or even the life for threatening construction or attendant.
Therefore, electric power enterprise it is highly desirable when earth cable is destroyed, theft or during ANOMALOUS VARIATIONS (mutation), monitoring is
System can send alarm signal to operator on duty in time by the on line real time to earth current and connector temperature, remind
Operator on duty and attendant start relevant treatment prediction scheme, it is to avoid life and property loss.
For during earth current accident analysis in prior art, peak period and low-valley interval are used to normal electric current
Situation considers not enough, easily produces wrong report；And anomaly analysis are not comprehensive not to be judged to the abnormal conditions of three-phase current.
Whether existing earth current failure analysis methods reach threshold value simply by record fault current frequency of abnormity
Wrong report is prevented, Rule of judgment is simple, and misinformation probability is high.
The content of the invention
In order to solve the above problems, the present invention provides a kind of earth current safe early warning analysis expert side of cable in tunnel
Method, can effectively detect current anomaly situation, and simultaneously for the current anomaly for persistently occurring early warning is analyzed；And can
The impact that current noise and accidental current fluctuation are caused to analysis result is rejected, the generation of early warning result wrong report is reduced.
To achieve these goals, the present invention is adopted the following technical scheme that：
The earth current safe early warning specialist analytical method of cable, comprises the following steps in a kind of tunnel：
Step 1：Alarm threshold value and filter condition are set in monitor supervision platform；Wherein, alarm threshold value includes saltus step exception
The abnormal threshold value of the abnormal threshold value of threshold value, absolute value, alternate contrast, filter condition has three to be included:Continuously generate abnormal secondary
Number, abnormal current duration, the contrast of time period；
Step 2：Numbering, the name information of each monitor terminal are loaded in monitor supervision platform；
Step 3：The current value of cable and during collection in the tunnel that monitor supervision platform real-time reception is gathered by each monitor terminal
Between；
Step 4：Earth current is anomaly divided into into three classes：Saltus step is abnormal, absolute value is abnormal and alternate contrast is abnormal；Successively
The earth current for judging each monitor terminal collection whether there is above-mentioned exception；
Step 5：Current anomaly analysis result in step 4 is filtered, is specifically included：Continuously generating frequency of abnormity is
It is no reach given threshold, abnormal current duration whether reach given threshold, with the presence or absence of current value phase in same time period
Together；When above-mentioned filter condition is satisfied by, warning is produced；
Step 6：Earth current anomaly analysis result in monitor supervision platform after output filtering.
Further, in the step 4, earth current is anomaly divided into into three classes：Saltus step exception, absolute value exception and phase
Between contrast it is abnormal；
(1) saltus step exception：The electric current value changes within setting time that judgement is received, the adjacent electric current electricity for receiving twice
Flow valuve rate of change is then judged as that saltus step is different beyond the positive change rate threshold value of setting or beyond inverse change rate threshold value
Often；
(2) absolute value exception：Whether the current value that judgement is received every time is beyond the threshold value for setting, if exceeding threshold value
Then it is judged as absolute value exception；
(3) alternate contrast is abnormal：The ratio of maximum current and minimum current in the three-phase current for receiving is judged, if described
Threshold value exceedes the threshold value of setting, then be judged as that alternate contrast is abnormal.
Further, in the step 5,
(1) continuously generate whether frequency of abnormity reaches given threshold：Judge whether abnormal current value meets continuous appearance, and
And continuously there is the number of times that frequency of abnormity reaches setting；If be unsatisfactory for, current anomaly is filtered；
(2) the abnormal current duration whether reach given threshold：Judge whether the time that abnormal current persistently occurs reaches
The duration threshold of setting is arrived, if be unsatisfactory for, current anomaly is filtered；
(3) it is identical with the presence or absence of current value in same time period：Whether judge in the in the past number of days of setting in the identical period
There is current value identical with present current value, if there is identical current value, then current anomaly is filtered.
Beneficial effects of the present invention：
1st, by the enforcement of the present invention, it is possible to achieve the early warning analysis to tunnel grounding electric current, electric current is effectively detected different
Reason condition.Simultaneously being directed to the current anomaly for persistently occurring is analyzed early warning.
2nd, by " continuous occurrence number " and " continue time of origin " condition judgment, current noise and accidental can be rejected
The impact that current fluctuation is caused to analysis result, reduces the generation of early warning result wrong report.
3rd, by " contrast of time period " condition judgment, can't the peak of daily normal electricity consumption, low-valley interval is this
The change of normality is mistaken for current anomaly change.
Description of the drawings
Fig. 1 is the earth current security early-warning analysis overall flow figure of the present invention；
Illustrate in Fig. 2 and whether continuously occur the schematic diagram that carries out abnormal judgement to electric current.
Specific embodiment
Below in conjunction with the accompanying drawings the invention will be further described with embodiment.
The earth current safe early warning specialist analytical method of cable is realized in monitor supervision platform in the tunnel of the present invention, is monitored
Platform communicates with each monitor terminal, and monitor terminal can gather the earth current value of tunnel cable and record acquisition time.
The invention discloses in a kind of tunnel cable earth current safe early warning specialist analytical method, as shown in figure 1, bag
Include：
Step 1：Alarm threshold value and filter condition are set in monitor supervision platform；Wherein, alarm threshold value includes saltus step exception
The abnormal threshold value of the abnormal threshold value of threshold value, absolute value, alternate contrast, filter condition presence three is abnormal secondary including continuously generating
Number, abnormal current duration, the contrast of time period；
Step 2：Numbering, the name information of each monitor terminal are loaded in monitor supervision platform；
Step 3：The current value of cable and during collection in the tunnel that monitor supervision platform real-time reception is gathered by each monitor terminal
Between；
Step 4：Earth current is anomaly divided into into three classes：Saltus step is abnormal, absolute value is abnormal and alternate contrast is abnormal；Successively
The earth current for judging each monitor terminal collection whether there is above-mentioned exception；
Step 5：Current anomaly analysis result in step 4 is filtered, is specifically included：Continuously generating frequency of abnormity is
It is no reach given threshold, abnormal current duration whether reach given threshold, with the presence or absence of identical in passing setting number of days
Current value is identical with present current value in period；When above-mentioned filter condition is satisfied by, warning is produced；
Step 6：Earth current anomaly analysis result in monitor supervision platform after output filtering.
In the present invention, the earth current safe early warning specialist analytical method of cable includes two parts：
Part I is that the detection to current anomaly judges, including current-jump judges extremely, absolute value judges extremely, phase
Between contrast is abnormal judges.Detecting any one current anomaly will enter into Part II.
Part II is that current anomaly analysis result is filtered, and real alarm condition is detected after filtration
Process, prevent wrong report.Part II includes abnormal continuous occurrence number, continues time of origin, time period contrast.Meet simultaneously with
To report to the police, otherwise analysis result is normal to upper three filter condition analysis results.
1st, the current anomaly that the following is Part I judges：
(1) saltus step exception：Change is beyond rising rate of change (S) or declines rate of change (X).Judge present current value and upper
Whether the current value rate of change of primary current value contrast exceedes rate of change.
(2) absolute value exception：Judge whether current value exceedes maximum (Max) or less than minimum of a value (Min).
(3) alternate contrast is abnormal：The ratio of maximum current and minimum current in the three-phase current for receiving is judged, if A phases
Electric current is maximum, and B items electric current is minimum, then A just compares with the ratio of B item electric currents with threshold value, and it is alternate right to be taken as beyond threshold value
Than exception.
2nd, the following is the filtering screening to abnormal current of Part II：
(1) continuous occurrence number：Judge whether abnormal current value meets continuous appearance, and continuously occur reaching setting
Number of times.Filtered if being unsatisfactory for.
(2) time of origin is continued：The time that abnormal current persistently occurs.The duration of setting is not met just by mistake
Filter.
(3) time period contrast：Judge in the same time in the number of days of setting with the presence or absence of current value and current flow
Value is identical, is filtered if identical.
Current fluctuation once in a while is probably that the current noise for gathering causes.This will not be impacted to cable operation, we
Can certainly be a kind of failure because this is not the current noise of collection causing more concerned with the continuous abnormal fluctuation for persistently occurring
Cause current anomaly.
But, if only focusing on the lasting time of origin of unusual fluctuations, it is possible it be merely creating abnormal current twice, only
It is that interval time twice is long；If only focusing on the continuous occurrence number of unusual fluctuations, it is possible it simply when of short duration
It is interior to there occurs repeatedly.
The present invention weighs continuous occurrence number and lasting time of origin simultaneously, is different in the range of certain hour in order to focus on
The number of times that often electric current is produced, i.e.,：The density that abnormal current occurs.If density is beyond our expection (threshold value), just this
Plant abnormal current and be judged as alarm status.The generation of wrong report can be so reduced, the accuracy of judged result is improved.
By the screening of above filter condition, accidental current anomaly situation can be filtered away.But normality (continues
Occur) current anomaly running status can be monitored, and by " contrast of time period " condition judgment, can't be
The peak of normal electricity consumption, the change of this normality of low-valley interval daily is mistaken for current anomaly change.
Illustrate in Fig. 2 to whether electric current the abnormal sliding window schematic diagram for being judged continuously occurs.
(1) continuous occurrence number condition judgment
If continuous occurrence number is m, then sliding window length is m+1.When new current value A is received, sliding window
Then mouth is compared judgement toward the lattice of front slide one to the current value of window ranges.
A () is directed to current break exception：
Adjacent current in window ranges is compared, if continuous m adjacent current value forward direction compares (or reversely compared
Compared with) ratio be both greater than mutated threshold value, then meet continuous occurrence number condition.
B () is transfinited exception for electric current：
Electric current in window ranges and the threshold value that transfinites are compared, the threshold value if continuous m primary currents value both greater than transfinites, that
Meet continuous occurrence number condition.
C () is abnormal for the alternate contrast of electric current：It is respectively compared any two of three-phase current.
The ratio of maximum current in three-phase current and minimum current is calculated, if occurring maximum current and most for continuous m time
The ratio of small current just meets continuous occurrence number condition beyond the situation of threshold value.
The adjacent time interval of current receiv twice can not exceed 1 hour, otherwise the current value in window ranges be emptied, directly
Judge again to filling up again after window.
(2) continue time of origin to judge
Analysis expert software records sliding window first time detect abnormal current time be T1, timer initiation meter
When, if sliding window still detects abnormal current presence after the T2 times, and meet T2-T1 continuing more than setting
Cumulative time, then just meet the condition that abnormal current persistently occurs.
(3) time period contrast judges
Analysis expert software records sliding window is T1 in the time that first time detects abnormal current, is then checked previous
Abnormal current change record of it the T1 periods either with or without same type.If there is record, when continuing T1 with the previous day again
Section contrast, if having ANOMALOUS VARIATIONS to record in N days of setting, this ANOMALOUS VARIATIONS for being judged as electric current belongs to normality change
Process.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to present invention protection model
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (3)
1. in a kind of tunnel cable earth current safe early warning specialist analytical method, it is characterized in that, comprise the following steps：
Step 1：Alarm threshold value and filter condition are set in monitor supervision platform；Wherein, alarm threshold value include the abnormal threshold value of saltus step,
The abnormal threshold value of the abnormal threshold value of absolute value, alternate contrast, filter condition has three to be included continuously generating frequency of abnormity, exception
Current duration, the contrast of time period；
Step 2：Numbering, the name information of each monitor terminal are loaded in monitor supervision platform；
Step 3：The current value and acquisition time of cable in the tunnel that monitor supervision platform real-time reception is gathered by each monitor terminal；
Step 4：Earth current is anomaly divided into into three classes：Saltus step is abnormal, absolute value is abnormal and alternate contrast is abnormal；Judge successively
The earth current of each monitor terminal collection whether there is above-mentioned exception；
Step 5：Current anomaly analysis result in step 4 is filtered, is specifically included：Continuously generate whether frequency of abnormity reaches
Whether reach given threshold to given threshold, abnormal current duration, with the presence or absence of in passing setting number of days in the identical period
Current value is identical with present current value；When above-mentioned filter condition is satisfied by, warning is produced；
Step 6：Earth current anomaly analysis result in monitor supervision platform after output filtering.
2. in a kind of tunnel as claimed in claim 1 cable earth current safe early warning specialist analytical method, it is characterized in that,
In the step 4, earth current is anomaly divided into into three classes：Saltus step is abnormal, absolute value is abnormal and alternate contrast is abnormal；
(1) saltus step exception：The current value rate of change within setting time that judgement is received, the adjacent electric current for receiving electric current twice
Value changes rate is then judged as saltus step exception beyond the positive change rate threshold value of setting or beyond inverse change rate threshold value；
(2) absolute value exception：Whether the current value that judgement is received every time is sentenced beyond the threshold value for setting if beyond threshold value
Break as absolute value exception；
(3) alternate contrast is abnormal：The ratio of maximum current and minimum current in the three-phase current for receiving is judged, if the threshold value
More than the threshold value of setting, then it is judged as that alternate contrast is abnormal.
3. in a kind of tunnel as claimed in claim 1 cable earth current safe early warning specialist analytical method, it is characterized in that,
In the step 5,
(1) continuously generate whether frequency of abnormity reaches given threshold：Judge whether abnormal current value meets continuous appearance, and connect
It is continuous the number of times that frequency of abnormity reaches setting occur；If be unsatisfactory for, current anomaly is filtered；
(2) the abnormal current duration whether reach given threshold：Judge whether the time that abnormal current persistently occurs reaches
The duration threshold of setting, if be unsatisfactory for, current anomaly is filtered；
(3) it is identical with the presence or absence of current value in same time period：Judge whether deposited in the same time within the time period of setting
Identical with present current value in current value, if there is identical current value, then current anomaly is filtered.
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| CN108318779A (en) * | 2017-12-26 | 2018-07-24 | 国网河北省电力有限公司景县供电分公司 | Line fault monitoring method, device, computer readable storage medium and equipment |
| CN109309376A (en) * | 2017-07-26 | 2019-02-05 | 新特能源股份有限公司 | Reduction furnace power ground protective device and method |
| CN109959862A (en) * | 2019-03-12 | 2019-07-02 | 杭州长川科技股份有限公司 | A kind of integrated circuit test device real time temperature monitoring system and method |
| CN110647093A (en) * | 2019-11-13 | 2020-01-03 | 上海迈内能源科技有限公司 | Intelligent monitoring system and monitoring method for power system based on big data analysis |
| CN111383427A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | LNA (Low noise amplifier) equipment and alarm method thereof |
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| CN111868648A (en) * | 2018-03-14 | 2020-10-30 | It空间株式会社 | Accurate pre-maintenance method for driving part |
| CN111868650A (en) * | 2018-03-14 | 2020-10-30 | It空间株式会社 | Accurate pre-maintenance method for driving part |
| CN111868649A (en) * | 2018-03-14 | 2020-10-30 | It空间株式会社 | Accurate pre-maintenance method for driving part |
| WO2021036466A1 (en) * | 2019-08-30 | 2021-03-04 | 北京国双科技有限公司 | Processing method and apparatus for edge device, storage medium and processor |
| CN113189503A (en) * | 2021-01-28 | 2021-07-30 | 南斗六星系统集成有限公司 | Multi-stage fault early warning method and system for battery of electric vehicle |
| CN114566878A (en) * | 2022-03-08 | 2022-05-31 | 东营金丰正阳科技发展有限公司 | Intelligent fire-fighting electrical control equipment for oil field and control method thereof |
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| US11030887B2 (en) | 2018-03-14 | 2021-06-08 | Its Co., Ltd. | Precise predictive maintenance method for driving unit |
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