CN109507541B - Power transmission line state judgment method based on historical data analysis - Google Patents
Power transmission line state judgment method based on historical data analysis Download PDFInfo
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 21
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- 238000007405 data analysis Methods 0.000 title claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 230000007613 environmental effect Effects 0.000 claims abstract description 6
- 238000009413 insulation Methods 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 claims description 22
- 230000002354 daily effect Effects 0.000 claims description 21
- 238000009825 accumulation Methods 0.000 claims description 6
- 238000012935 Averaging Methods 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 4
- 230000003203 everyday effect Effects 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 239000012212 insulator Substances 0.000 description 6
- 238000009833 condensation Methods 0.000 description 5
- 230000005494 condensation Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
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- 238000007418 data mining Methods 0.000 description 2
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- 238000003912 environmental pollution Methods 0.000 description 1
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Abstract
The invention discloses a power transmission line state judgment method based on historical data analysis, which is characterized in that historical data of leakage current monitoring is deeply analyzed, environmental information is combined, the insulation state of a power transmission line is researched and judged, and support is provided for decision making of operators; determining a basic time unit, and analyzing the change process of the real-time measured electrical parameters; the electric state change rule of the power transmission line is obtained by analyzing the composition form of each basic time unit identification unit and the average line, and the historical working state of the line is obtained by analyzing. The method can be used for judging and early warning the fault of the power transmission circuit.
Description
Technical Field
The invention belongs to the field of electric power, and relates to a power transmission line state judgment method based on historical data.
Background
In recent years, informatization of the power industry has been greatly developed, power data resources have rapidly increased, and how to store and apply the data is a difficult problem for power companies; on the other hand, the data has great utilization value, the self management and operation level of the power grid can be improved to a new level, even fundamental change is generated, more and better services can be provided for government departments, industries and broad users, and conditions are provided for power companies to expand a plurality of value-added services. The data mining based on historical data is to mine potential knowledge from data on the basis of a simple data query function and provide support for decision making, and the main tasks of the data mining are association analysis, classification, prediction of time sequence patterns, deviation analysis and the like, and are key steps of knowledge discovery.
After years of treatment, the pollution flashover prevention and control work of the power transmission line in China has achieved obvious effect. However, as the problem of environmental pollution in local areas increases, pollution flashover accidents still occur frequently. The leakage current on the surface of the insulator is an electrical characteristic quantity which can comprehensively represent the pollution degree and the damp condition on the surface of the insulator and is closely related to the pollution flashover process. The leakage current is used as a research means to evaluate the external insulation state, and the method has important significance for the insulation state monitoring work of the power transmission line.
Disclosure of Invention
The invention aims to provide a power transmission line state judgment method based on historical data analysis.
The purpose of the invention is realized by the following technical scheme:
a power transmission line state judgment method based on historical data analysis is characterized in that: through analyzing historical data of leakage current monitoring, and combining environmental information, the insulation state of the power transmission line is researched and judged, and support is provided for decision making of operators; the method comprises the following specific steps:
determining a basic time unit, and analyzing the change process of the real-time measured electrical parameters; the following data are extracted from the real-time surface conductivity measured continuously per elementary time unit:
σo: electrical measurements at a first fixed time per elementary time unit;
σc: electrical measurements at a second fixed time per elementary time unit;
σmax: a real-time electrical measurement maximum for each fundamental time unit;
σmin: each radicalThe minimum value of the real-time electrical measurement value of the time unit;
σave: a real-time electrical measurement average for each elementary time unit;
will sigmao，σc，σmax，σminRepresented in the same identification cell; first sigmaoAnd σcThe part between them is drawn as a rectangle; if σ iscHigher than σoThen, it is represented by a filled rectangle; otherwise, the hollow rectangle is used for representing; using thinner lines to divide sigmamaxAnd σminRespectively connected with the entities;
each basic time unit identification unit will have two basic forms, namely an increase type and a decrease type; in special cases, square-above radio, i.e. σ, occursmaxAnd σcEqual, rectangular lower bound, i.e. sigmaoAnd σminEqual, rectangular shape with only one segment left, i.e. sigmaoAnd σoAn equality condition;
real-time surface conductivity average σ from each elementary time unitaveCalculating to obtain different average lines, wherein the drawing method comprises the steps of averaging the average values of a plurality of previous monitors again and connecting the average values;
the electric state change rule of the power transmission line is obtained by analyzing the composition form of each basic time unit identification unit and the average line, and the historical working state of the line is obtained by analyzing.
According to the invention, through deep analysis of historical data of leakage current monitoring and combination of environmental information, the insulation state of the power transmission line can be researched and judged, and support is provided for decision making of operators. The invention can be used for judging and early warning the fault of the power transmission circuit.
Drawings
Fig. 1a is a schematic diagram of the growth in daily data units in the present invention.
FIG. 1b is a schematic diagram of a reduction in daily data units in the present invention.
Fig. 2 is a schematic diagram of the cumulation in the present invention.
FIG. 3 is a schematic view of the bleed-off type of the present invention.
FIG. 4 is a schematic representation of a stabilization system according to the invention.
Detailed Description
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other cases can be obtained according to these cases without creative efforts.
And analyzing and measuring the change process of the electrical parameters in real time by taking days (24 hours) as a basic time unit. The following data were extracted from the daily continuous measurement of real-time surface conductivity:
σo: the electrical measurement value at the first fixed time every day is set as the electrical measurement value at the 8-point time;
σc: the electrical measurement value at the second fixed time every day is set as the electrical measurement value at the 18-point time;
σmax: daily real-time electrical measurement maximum;
σmin: daily real-time electrical measurement minimum;
σave: daily real-time electrical measurement averages.
Will sigmao，σc，σmax，σminAre represented in the same identification element. First sigmaoAnd σcThe part between them is drawn as a rectangle; if σ iscHigher than σoThen, it is represented by a filled rectangle; otherwise, the rectangle is indicated by the open. Using thinner lines to divide sigmamaxAnd σminRespectively connected with the entities.
In general, the daily identification element will appear in two basic forms, an increase form and a decrease form; in special cases, square-above radio (σ) occursmaxAnd σcEqual), rectangular below wireless (σ)oAnd σminEqual), rectangle has only one line segment (σ) leftoAnd σoEqual), etc.
From daily real-time surface conductivity average σaveDifferent daily average lines can be calculated, and the average value of a plurality of previous monitoring days is averaged again and connected. For example, the 5-day average line is a plot line of the previous 5-day average value. Generally, the N-day average line is plotted as:
the 5-day average line was used in this example.
By analyzing the composition form of the daily identification unit and the daily average line, the change rule of the electrical state of the power transmission line can be obtained, and the historical working state of the line is obtained through analysis.
When the historical state is judged, whether condensation occurs or not is judged according to the ambient temperature and the ambient humidity, and the condensation is used for identifying the line state.
Dew point is the temperature at which water vapor condenses into liquid dew under certain conditions of water vapor content and atmospheric pressure in the environment. When the relative humidity of the environment is 100%, the dew point temperature is the same as the ambient temperature; when the ambient relative humidity is less than 100%, the dew point is lower than the ambient temperature. The relational expression of the dew point, the relative humidity of the environment and the temperature of the environment is as follows:
wherein RH is relative humidity, in units%; t is temperature in units; dPThe dew point is in degrees Celsius.
When the ambient temperature is lower than the dew point temperature, the surface will be exposed to condensation.
Examples are as follows:
the most basic information that operators want to obtain through historical operating state analysis is whether the current line electrical condition is getting worse or better. Thus, from a state evaluation perspective, historical operating states are divided into three types: accumulation type, loss type and stable type.
1. Accumulation type
Cumulative means that the amount of fouling increases gradually over the time period analyzed. Generally, the accumulated filth has the following characteristics:
(1) the daily identification unit takes growth type as main or all growth type;
(2) the average line is mainly increased, and the primary reciprocal of the average line is basically positive;
(3) the uniform line passes through the single-day identification unit or is positioned below the identification unit.
When the daily identification unit is positioned above the average line, as shown in the figure, the adverse weather condition appears, or the filth is in the rapid accumulation process, and needs to be noticed by operators.
2. Run-off type
The run-off type means that the amount of filth gradually decreases in the analyzed time zone. Generally, the pollution loss type has the following characteristics:
(1) the daily identification unit is mainly reduced or totally reduced;
(2) the average line is mainly decreased progressively, and the primary reciprocal of the average line is basically negative;
(3) the uniform line passes through the single-day identification unit or is positioned above the identification unit.
When the daily identification unit is positioned below the average line, the situation that the filth is in the rapid loss process is usually favorable for the safe operation of the line under the condition, and the maintenance times can be reduced.
3. Stable form
When the surface contamination of the insulator is not obviously accumulated or lost, the real-time surface conductivity is not obviously changed, and the characteristic of stable contamination is shown:
(1) the growth type and the reduction type of the identification unit are mutually alternated every day;
(2) the average line is smooth, the inverse number of the average line is positive or negative, and the average value is generally small;
(3) the average line passes through substantially all of the single day identification cells.
When the characteristics of the pollution stability appear, the accumulation and the loss degree of the pollution at the moment can be judged to be equivalent, and the dynamic balance of the meteorological conditions and the certain degree of the region is formed. In such a case, the current line mode of operation may be substantially continued until a foul-accumulating condition occurs.
By utilizing environmental temperature and humidity monitoring, the surface temperature of the insulator can be calculated, and the judgment of the surface condensation state of the insulator can be realized by comparing with the environmental dew point. The condensation can cause the pollution loss on the surface of the insulator, and can be used for assisting in judging the state of the power transmission line.
Claims (1)
1. A power transmission line state judgment method based on historical data analysis is characterized in that: through analyzing historical data of leakage current monitoring, and combining environmental information, the insulation state of the power transmission line is researched and judged, and support is provided for decision making of operators; the method comprises the following specific steps:
determining a basic time unit, and analyzing the change process of the real-time measured electrical parameters; the following data are extracted from the real-time surface conductivity measured continuously per elementary time unit:
σo: electrical measurements at a first fixed time per elementary time unit;
σc: electrical measurements at a second fixed time per elementary time unit;
σmax: a real-time electrical measurement maximum for each fundamental time unit;
σmin: a real-time electrical measurement minimum for each fundamental time unit;
σave: a real-time electrical measurement average for each elementary time unit;
will sigmao，σc，σmax，σminRepresented in the same identification cell; first sigmaoAnd σcThe part between them is drawn as a rectangle; if σ iscHigher than σoThen, it is represented by a filled rectangle; otherwise, the square is used for representing(ii) a Using thinner lines to divide sigmamaxAnd σminRespectively connected with the entities;
each basic time unit identification unit will have two basic forms, namely an increase type and a decrease type; in special cases, square-above radio, i.e. σ, occursmaxAnd σcEqual, rectangular lower bound, i.e. sigmaoAnd σminEqual, rectangular shape with only one segment left, i.e. sigmaoAnd σoAn equality condition;
real-time surface conductivity average σ from each elementary time unitaveCalculating to obtain different average lines, wherein the drawing method comprises the steps of averaging the average values of a plurality of previous monitors again and connecting the average values;
obtaining the electrical state change rule of the power transmission line by analyzing the composition form of each basic time unit identification unit and the averaging line, and analyzing to obtain the historical working state of the line;
the basic unit of time is day, i.e. 24 hours, σo: the electrical measurement value of the first fixed time of each basic time unit is set as the electrical measurement value of the 8-point time; sigmac: the electrical measurement value of the second fixed time of each basic time unit is set as the electrical measurement value of the 18-point time;
from daily real-time surface conductivity average σaveCalculating to obtain different daily average lines, wherein the drawing method comprises the steps of averaging the average values of a plurality of previous monitoring days again and connecting the average values; the 5-day average line is a drawing point connecting line of the average value of the previous 5 days; the plots of the N-day average line are:
obtaining the electrical state change rule of the power transmission line by analyzing the composition forms of the daily identification unit and the daily average line, and analyzing to obtain the historical working state of the line;
the historical operating conditions are divided into three types: accumulation, loss and stabilization, wherein the accumulation has the following characteristics:
1) the daily identification unit takes growth type as main or all growth type;
2) the average line is mainly increased, and the primary reciprocal of the average line is basically positive;
3) the uniform line passes through the single-day identification unit or is positioned below the identification unit;
the run-off type has the following characteristics:
1) the daily identification unit is mainly reduced or totally reduced;
2) the average line is mainly decreased progressively, and the primary reciprocal of the average line is basically negative;
3) the uniform line passes through the single-day identification unit or is positioned above the identification unit;
the stable form has the following characteristics:
1) the growth type and the reduction type of the identification unit are mutually alternated every day;
2) the average line is smooth, the inverse number of the average line is positive or negative, and the average value is generally small;
3) the average line passes through substantially all of the single day.
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Effective date of registration: 20190829 Address after: 210000 No. 215 Shanghai Road, Nanjing, Jiangsu Province Applicant after: State Grid Jiangsu Electric Power Co., Ltd. Applicant after: Jiangsu Electric Power Information Technology Co., Ltd. Address before: 210000 No. 215 Shanghai Road, Nanjing, Jiangsu Province Applicant before: State Grid Jiangsu Electric Power Co., Ltd. Applicant before: Jiangsu Electric Power Information Technology Co., Ltd. Applicant before: Guangzhou Huazhi Electric Technology Co. Ltd. |
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