CN104732058B - A kind of appraisal procedure of various dimensions transmission facility state - Google Patents

Abstract

The present invention first establishes a state evaluation model of power transmission equipment with a multi-layer structure, and establishes a special evaluation time period and a special line section. Then, the cumulative deduction method is used as the basic scoring method for each parameter in the evaluation model, and the actual weight and actual deduction value of each parameter are given in combination with the evaluation period and evaluation section. Finally, according to the parameter score value, the score value of each sub-component, tower section, and whole of the power transmission equipment is calculated in turn, and the overall status of the power transmission equipment is comprehensively judged by combining the two dimensions of the evaluation period and the evaluation section. The present invention integrates information of three dimensions of line score, time and space, and the state evaluation method is comprehensive and expandable, and the final multi-dimensional evaluation conclusion is close to the real operating state of the power transmission equipment.

Description

A method for evaluating the state of multi-dimensional power transmission equipment

technical field

The invention relates to a method for evaluating the status of multi-dimensional power transmission equipment.

Background technique

The safety of power transmission equipment is the basis for safe, reliable and stable operation of the power grid. Effective and accurate assessment, diagnosis and prediction of equipment status will not only directly affect subsequent risk assessment and maintenance decisions, but also improve power supply reliability and power grid operation. An important way to the level of intelligence.

Due to the wide distribution area of power transmission equipment, numerous sub-components, and the large impact of natural environment, the state evaluation of power transmission equipment faces the difficulty of comprehensiveness and accuracy. To conduct a comprehensive and accurate state assessment, it is necessary to integrate multi-source heterogeneous information such as equipment state information, power grid operation information, and environmental state information, combined with the historical, current, and future states of power equipment, through certain standards and intelligent evaluation methods. State assessment results.

At present, the state evaluation research on power transmission equipment at home and abroad is mainly reflected in the following two aspects: 1. Monitoring technology based on electrical or mechanical parameters of power transmission equipment (such as measuring wire tension and inclination to realize wire icing monitoring, measuring insulator salt Contamination monitoring of insulators through density and leakage current), through some macro state analysis based on a single or a small number of parameters, such as tower inclination, anti-theft and other parameters to evaluate the state of the tower, and to evaluate the state of the wire according to icing, wind deviation, galloping, etc. . 2. Based on the mathematical evaluation model (such as fuzzy mathematical model, combined weighting model, gray comprehensive evaluation model, etc.), comprehensively evaluate the status of equipment according to various aspects of information such as rated service life, load conditions, test information, and ambient temperature. The above two aspects of research are unable to scientifically grasp the overall health status and state development trend of power transmission equipment.

In terms of the prior art of the state evaluation method, the widely used method is the accumulative deduction method. The calculation process is to describe the deduction weight and deduction value of each parameter of the equipment under different deterioration degrees by combining various information such as the operation status of the equipment over the years, routine tests, inspections, operating conditions, and online monitoring, and then calculate The deduction value of the overall equipment and refer to the score table to evaluate the operation status of the equipment. At present, the cumulative deduction method is used as the primary evaluation method in the transmission equipment evaluation guidelines, industry standards and other relevant normative documents of the State Grid and China Southern Power Grid. The classification is finer, which is convenient for digital management, but the standard does not take absolute consideration into the ambiguity and uncertainty of the state quantity.

Contents of the invention

The invention evaluates the output line in multiple dimensions from the aspects of state quantity score, evaluation time period and evaluation section, and establishes a state evaluation method of power transmission equipment that integrates three dimensions of state, time, and space. The present invention first establishes a state evaluation model of power transmission equipment with a multi-layer structure, and establishes a special evaluation time period and a special line section. Then, the cumulative deduction method is used as the basic scoring method for each parameter in the evaluation model, and the actual weight and actual deduction value of each parameter are given in combination with the evaluation period and evaluation section. Finally, according to the parameter score value, the score value of each sub-component, tower section, and whole of the power transmission equipment is calculated in turn, and the overall status of the power transmission equipment is comprehensively judged by combining the two dimensions of the evaluation period and the evaluation section.

The method for evaluating the state of variable weight fuzzy power transmission equipment based on combined weighting according to the present invention includes the following steps:

Step S1, establishing a state evaluation model of power transmission equipment with a multi-layer structure, and establishing a state evaluation parameter system;

Step S2, describes the evaluation method and deduction standard of each parameter, defines the special evaluation time period and special route section, and establishes the calculation of the actual weight of each parameter and the actual deduction value based on the two dimensions of evaluation time period and evaluation section method;

In step S3, the score values of each sub-component, tower section, and whole of the power transmission equipment are sequentially calculated according to the parameter score values, and the overall status of the power transmission equipment is comprehensively evaluated in combination with the two dimensions of the evaluation period and the evaluation section.

In the above method for assessing the status of power transmission equipment, the step S1 includes:

Based on the principles of comprehensiveness and scalability of the state evaluation of power transmission equipment, a state evaluation model with a multi-layer architecture is established as shown in Figure 1. The state evaluation model is divided into three evaluation layers: transmission equipment components, tower sections, and overall lines. The power transmission equipment component layer divides the power transmission equipment into 9 parts, and the evaluation parameters of each part are shown in Table 1; the tower segment layer is composed of the evaluation of each base tower segment, and the status of each component in the adjacent tower segment Interaction; the overall line layer refers to the evaluation of the entire transmission line, which combines the status information of each sub-component and tower section with multi-dimensional information such as evaluation time period and section, and finally realizes the comprehensive evaluation of the line.

Table 1 State evaluation parameters of each sub-component

In the above method for assessing the status of power transmission equipment, the step S2 includes:

The evaluation method and deduction standard of each parameter are described, and the special evaluation period and special line section of the line are established according to the fault distribution, external force, and environmental distribution of the line. In the deduction standard of parameters, the actual weight of each parameter and the calculation method of the actual deduction value are established in combination with the actual evaluation period and evaluation section.

1) Establish scoring methods and deduction criteria for each parameter

The parameters mentioned above refer to all the status evaluation parameters in Table 1. The parameters are obtained by integrating existing guidelines, industry standards, specifications, etc., and the acquisition methods of parameter data are routine inspections.

The scoring method for each parameter uses the cumulative deduction method. Firstly, establish the score range of equipment operation status, the full score is 100 points, 0 points means that the equipment needs to be repaired immediately, and 100 points means that the equipment is operating normally and does not need to be repaired. According to the degree of influence of the state quantity on the safe operation of the equipment, the equipment state is divided into four levels, indicating that the influence is small to large, and the weights are set to 1, 2, 3, 4 respectively, and the deterioration degree of the state quantity is also divided into four levels from light to heavy Level 4, the corresponding basic deduction points are 2, 4, 6, and 8 points, and the deduction value is equal to the weight of the state quantity multiplied by the deduction value.

2) Establish special time periods and special sections for status evaluation of power transmission equipment

During the operation of power transmission equipment, due to its wide distribution area, the impact of external force and natural environment is complex and changeable. Therefore, the influence of time and space position should be considered in the evaluation. Through the statistical analysis of the fault distribution, external force and environmental distribution of the line over the years, the special evaluation time period and special line section of the transmission equipment are established.

The special evaluation period includes the period of frequent lightning strikes (March to September), the period of frequent mountain fires (September to January of the next year), the period of frequent ice covering (November to February of the next year), and the period of frequent typhoons ( June to October), period of frequent bird damage (September to November), period of frequent external damage (September to November).

Special evaluation sections include frequent lightning strikes, frequent mountain fires, frequent icing, frequent typhoons, frequent bird damage, and frequent external damage. The special evaluation sections have different geographical locations according to the different evaluation lines. Taking the lines under the jurisdiction of China Southern Power Grid as an example, the areas with frequent lightning strikes are under the jurisdiction of Guangzhou Bureau, Baise Bureau, Wuzhou Bureau, and Liuzhou Bureau. Mountain fires frequently occur The section is under the jurisdiction of Liuzhou Bureau and Tianshengqiao Bureau, the section with frequent icing is under the jurisdiction of Guiyang Bureau, Tianshengqiao Bureau, and Nanning Bureau, the section with frequent typhoons is under the jurisdiction of Guangzhou Bureau, Guiyang Bureau, and Wuzhou Bureau, and frequent bird damage The section is under the jurisdiction of Qujing Bureau, and the section with frequent external damage is under the jurisdiction of Guangzhou Bureau and Guiyang Bureau.

3) Calculate the actual weight and deduction value of each parameter

1. The score system and weight division of each parameter in the normal time period and section

Under normal time periods and sections, based on national standards, industry standards, and state evaluation guidelines of the State Grid and China Southern Power Grid, the weight division and deduction criteria for each parameter are obtained.

2. The score system and weight division of each parameter in a special time period or special section

2.1 Special evaluation period

When the parameter is in the special evaluation period, the deduction standard is the same as in the normal period and section, but the weight of the parameter and the deduction value should be multiplied by the special factor on the basis of the normal period.

The specific formula is as follows:

λ ₂ =α ₁ *λ ₁

Among them: λ ₁ is the weight of the state quantity in the normal period, λ ₂ is the weight of the state quantity in the special period, and α ₁ is the coefficient factor in the special period.

K ₂ =α ₁ *K ₁

Among them: K ₁ is the basic deduction value of state quantity in normal time period, K ₂ is the basic deduction value of state quantity in special time period, and α ₁ is the coefficient factor in special time period.

The distribution function of the coefficient factor α is obtained from the statistics of the number of monthly occurrences of line faults and defects over the years, and different special periods correspond to different distribution functions.

2.1.1 Period of frequent icing

The icing of transmission lines mainly occurs from November to February of the next year, especially in the winter and late spring when the icing frequency is the highest. January and December are the months with the lowest average temperature in almost all ice-covered areas, but the humidity is relatively small, so the line is less icy than November and February.

The coefficient factor α obeys the normal distribution of N(12, 2), the formula is:

Wherein, x is the month (in January of the next year, x=13). Its value is shown in the figure below, and the value of the coefficient factor α can be obtained according to the time period of the state evaluation, so as to calculate the weight and deduction value of the state quantity in a special time period. Since the influence of special periods is considered in state evaluation, the α value between November and February of the next year is obtained from the figure, and the α value of other months is taken as 1.

2.1.2 Lightning-frequent periods

In my country, lightning mostly occurs in summer, late spring and early summer, and late summer and early autumn (May to September), but the possibility of frequent lightning in other seasons is not ruled out, especially in the south. The uplifting movement of the airflow is obvious, and it is easy to produce strong convective weather such as thunder and lightning.

The coefficient factor α obeys the t distribution of t(3), the formula is:

Its value is shown in the figure below. Since only the influence of special time periods is considered in the evaluation, the α value between May and September is obtained from the figure, and the α value of other months is taken as 1.

2.1.3 Period of frequent wildfires

The environmental conditions of wildfires are closely related to the vegetation, surrounding environment, terrain and personnel activities in the route passage. Autumn and early winter (September to January) are periods when wildfires frequently occur. This is because the weather is dry and windy. At this time, it is easy for farmers to burn wasteland, resulting in a high incidence of wildfires. From the statistical data of mountain fire tripping accidents in various regions, Guizhou and Yunnan are high-incidence areas for line trips caused by mountain fires, and the lines under the jurisdiction of Liuzhou Bureau and Guizhou Bureau are key mountain fire prevention areas.

The coefficient factor α obeys the weibull distribution of weib(1,1.2), the formula is:

α ₁ (x)=1.2(x-11) ^0.2 exp(-(x-11) ^1.2 )

Its value is shown in the figure below. Since only the influence of special time periods is considered in the evaluation, the α value between September and January of the next year is obtained from the figure, and the α value of other months is taken as 1.

2.1.4 Typhoon frequent period

Most typhoons in the northern hemisphere occur from June to October. The coefficient factor α obeys the beta distribution of beta(2,5), x represents the month, and the formula is:

Its value is shown in the figure below. Since only the influence of special time periods is considered in the evaluation, the α value between June and October is obtained from the figure, and the α value of other months is taken as 1.

2.1.5 Bird damage and frequent external force periods

Bird damage and external forces frequently occur from September to November. The coefficient factor α obeys the distribution of cauchy(8,1),

Its value is shown in the figure below. Since only the impact of special time periods is considered in the evaluation, the α value between September and November is obtained from the figure, and the α value of other months is taken as 1.

2.2 Special Evaluation Section

When the parameter is in the special evaluation section, the deduction standard is the same as in the normal period and section, but the weight of the parameter and the deduction value should be multiplied by the special factor on the basis of the normal period.

The specific formula of the weight of the state quantity is

λ ₃ =α ₂ *λ ₁

Among them: λ ₁ is the weight of the state quantity in the normal period, λ ₃ is the weight of the state quantity in the special section, and α ₂ is the coefficient factor of the special section.

The specific formula for the deduction value of the state quantity is

K ₃ =α ₂ *K ₁

Among them: K ₁ is the deduction value of state quantity in normal time period, K ₃ is the deduction value of state quantity in special time period, and α ₂ is the coefficient factor of special section.

The value of the coefficient factor _α2 is obtained from the statistical analysis of the fault point density in the fault-prone area. According to the statistics of the geographical location of the fault in the fault-prone area over the years (in the figure. is the fault point), the center of the fault-prone area is is the density center O, and the fault point density function φ centered on O is obtained, and φ is a normal distribution function, which is recorded as φ～N(μ ₂ , δ ₂ ² ).

The density function φ indicates that the farther away from the density center, the sparser the distribution of fault points, and the smaller the probability of line failure. Different special sections correspond to different coefficient factor α distribution functions.

2.2.1 Icing frequent section

The ice-covered frequent areas are the areas under the jurisdiction of Guiyang Bureau, Tianshengqiao Bureau, and Nanning Bureau. The coefficient factor α obeys the normal distribution of N(0, 1.63), and the formula is

Where x represents the distance between the geographic location of the parameter to be evaluated and the center of the special section (in km). The value of α is shown in the figure below. Since only the influence of special time periods is considered in the evaluation, the value of α is obtained from the figure when x is between 0 and 30km, and the value of α is 1 when x is greater than 30km.

2.2.2 Segments with frequent lightning strikes

The areas with frequent lightning strikes are the areas under the jurisdiction of Guangzhou Bureau, Baise Bureau, Wuzhou Bureau, and Liuzhou Bureau. The coefficient factor α obeys the exponential distribution, and the formula is

Where x represents the distance between the geographic location of the parameter to be evaluated and the center of the special section (in km). The value of α is shown in the figure below. As x increases, the value of α gradually tends to 1.

2.2.3 Segments with frequent wildfires

The area with frequent mountain fires is the area under the jurisdiction of Liuzhou Bureau and Tianshengqiao Bureau. The coefficient factor α obeys the f distribution of f(2, 5), and the formula is

Where x represents the distance between the geographic location of the parameter to be evaluated and the center of the special section (in km). The value of α is shown in the figure below. As x increases, the value of α gradually tends to 1.

2.2.4 Typhoon-frequent areas

The typhoon-frequent section is under the jurisdiction of Guangzhou Bureau and Nanning Bureau, and the coefficient factor α obeys the gamma distribution of gamma(1,2), the formula is

Where x represents the distance between the geographic location of the parameter to be evaluated and the center of the special section (in km). Where x represents the distance between the geographic location of the parameter to be evaluated and the center of the special section (in km). The value of α is shown in the figure below. As x increases, the value of α gradually tends to 1.

2.2.5 Areas where bird damage and external damage frequently occur

The area with frequent mountain fires is the area under the jurisdiction of Liuzhou Bureau and Tianshengqiao Bureau. The coefficient factor α obeys the chi-square distribution of chi2(4), and the formula is

Where x represents the distance between the geographic location of the parameter to be evaluated and the center of the special section (in km). The value of α is shown in the figure below. As x increases, the value of α gradually tends to 1.

2.3 The parameters to be evaluated are in a special period and a special section at the same time

When the parameter to be evaluated is in a special time period or a special section at the same time, its coefficient factors α ₁ and α ₂ corresponding to the special time period and special section are calculated respectively,

α＝α ₁ ·α ₂

The product of α ₁ and α ₂ is used as the actual coefficient factor α to calculate the actual weight and actual deduction value.

In the above method for assessing the status of power transmission equipment, the step S3 includes:

According to the parameter score value, the score value of each sub-component, tower section and the whole of the power transmission equipment is calculated in turn, and the overall status of the power transmission equipment is comprehensively judged by combining the two dimensions of the evaluation period and the evaluation section.

1) Calculate the score value of each sub-component of each base tower segment

The total score for each sub-component of each base tower segment is 100 points, and the total deduction limit for each sub-component is 100 points. According to the evaluation method and deduction standard of each parameter in step S2, the calculation process of the score value of each sub-component of each base tower section is as follows:

Point deduction value B for a single parameter

B=K×Z

Among them: K is the basic deduction value of the state quantity, and Z is the weight value of the state quantity. Select the corresponding weight and deduction value according to the actual status evaluation time and evaluation route. When it is in the normal time period and section, K and Z are obtained according to the deduction standard in the existing State Grid and South Grid status evaluation guidelines; When in the special evaluation period or special evaluation section, K and Z are obtained according to the calculation method of the actual weight and the actual basic deduction value in step S2.

The deduction value Y of each sub-component of each base tower segment

Among them: X is the number of deducted state quantity items for each sub-component of each base section, and B is the deduction value of each state quantity.

The score value Q of each sub-component of each base segment

Q=100-Y

2) Calculate the total score of each base segment

The evaluation of the tower position section is composed of the sub-component evaluation of the tower position section, and the evaluation steps are as follows:

The weighted score value R of each sub-component of each base section

R=Q×P

Among them: Q is the calculated score of the sub-component, and P is the weight of the sub-component.

The total score S of each base segment

Among them: R1~R8 are the weighted score values of the 8 sub-components in each base tower section.

3) Calculate the overall score of the line

Overall score O for line subcomponents:

Among them: N is the number of tower sections with points deducted for this line, and Q is the score value of the corresponding sub-components in the tower sections with points deducted for this line.

Overall score T of the line:

Among them: N is the number of tower sections with points deducted on this line, and S is the score value of the tower sections with points deducted on this line.

4) Evaluate the overall status of power transmission equipment

According to the multi-dimensional evaluation criteria, the overall state of the line is comprehensively judged according to the three dimensions of evaluation time period, geographical section of the line, and the overall score of the line. The evaluation principles are:

1. Under normal circumstances, the line evaluation grade is given according to the line evaluation status score table;

According to the calculated overall score T of the line, the overall state of the line is obtained. The score ranges of various evaluation states of the line are shown in Table 3.

2. Table 3 Score range table for the overall evaluation status of the line

Score 100～95 85～95 (inclusive) 75～85 (inclusive) 75 (inclusive) or less evaluation status normal status attention state Abnormal state serious state

2. When the evaluation of the line is in a special time period or a special section, increase the weight and deduction value of the abnormal state quantity, and reduce the evaluation of the tower section by one level if necessary.

The overall evaluation of the line in the special evaluation period or special evaluation section is divided into the following situations:

a. When the total score T of the route is normal or in a state of attention and the conditions listed in Table 4 do not appear, the overall evaluation of the route is in a normal state;

b. When all sub-components are scored as normal or paying attention, but one of the conditions listed in Table 4 occurs, the overall evaluation of the line is abnormal.

c. When any line has 5 or more tower sections, the score is in the state of attention, regardless of the score of the sub-components of the line and the total score of the line, the overall evaluation of the line is in the state of attention.

d. When any line has 3 bases and above tower sections, the score is abnormal, regardless of the score of the sub-components of the line and the total score of the line, the overall evaluation of the line is abnormal.

e. When any line has 1 base and above tower sections, the score is serious, regardless of the score of the sub-components of the line and the total score of the line, the overall evaluation of the line is serious.

Table 4 List of abnormal states in special time periods and sections of the line

Description of drawings

Figure 1 shows the status evaluation model of power transmission equipment.

Fig. 2 is the function distribution diagram of the coefficient factor α in the period of frequent icing in the special evaluation period.

Figure 3 is a function distribution diagram of the coefficient factor α in the period of frequent lightning in the special evaluation period.

Figure 4 is a function distribution diagram of the coefficient factor α under the period of frequent wildfires in the special evaluation period.

Figure 5 is a function distribution diagram of the coefficient factor α in the typhoon-frequent period in the special evaluation period.

Figure 6 is a function distribution diagram of the coefficient factor α under the period of frequent bird damage and external force in the special evaluation period.

Figure 7 is a geographical distribution map of faults over the years in areas where faults frequently occur.

Fig. 8 is a function distribution diagram of the coefficient factor α in the ice-covered frequent section in the special evaluation section.

Fig. 9 is a function distribution diagram of the coefficient factor α in the lightning strike frequent section in the special evaluation section.

Figure 10 is a function distribution diagram of the coefficient factor α under the mountain fire frequent section in the special evaluation section.

Figure 11 is a function distribution diagram of the coefficient factor α in the typhoon-frequent section in the special evaluation section.

Figure 12 is a function distribution diagram of the coefficient factor α in the special evaluation section in the section where bird damage and external force damage frequently occur.

Figure 13 is an overall block diagram of multi-dimensional evaluation.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

According to the multi-dimensional evaluation method of the present invention, the status evaluation of the 500kV transmission line Guishan Line A under the China Southern Power Grid is carried out, and the results of the multi-dimensional status evaluation are verified in combination with actual operating conditions. Some inspection records of this section of the transmission line are shown in Table 5:

Table 5 Inspection records of transmission lines

The state evaluation parameter system of this section transmission line is as shown in table 1, and its state comment set is V={good, general, attention, serious}, the state evaluation process of this transmission line according to the state evaluation method of the present invention is as follows:

1. Calculate the score value of the sub-components

According to the inspection record and the parameter deduction standard of component wires, it is assumed that the deduction points should be 4 points, 5 points and 5 points during the normal evaluation period.

(1) Since December is a period of frequent icing, the weights and deductions of parameters related to icing should be multiplied by coefficient factors on the basis of normal periods. The coefficient factor α ₁ corresponding to the frequent icing period obeys the distribution of N(12, 2), and the formula is:

Wherein, x is the month (in January of the next year, x=13). The value of α ₁ is shown in the figure below, and the value of the coefficient factor α can be obtained according to the time period of the state evaluation, so as to calculate the weight and deduction value of the state quantity in a special time period.

Since the state evaluation time is December, it can be obtained from the figure that the value of the coefficient factor α1 is _1.2 .

(2) The #230-#231 tower section of Guishan Jia Line is in the ice-covered frequent section, so the weight and deduction value of the parameters related to ice-covered should be multiplied by the coefficient factor on the basis of the normal time period. The coefficient factor _α2 corresponding to the icing frequent section obeys the distribution of N(0, 1.63), and the formula is:

Where x represents the distance between the geographic location of the parameter to be evaluated and the center of the special section (in km). The value of α ₂ can be read directly from the figure. The distribution of the coefficient factor α ₂ shows that the farther away from the center of the special section, the closer the value of the coefficient factor α ₂ is to 1. When the distance from the center of the special section is greater than 30km, The values of α ₂ are all 1.

Since the tower section #230-#231 of the Guishanjia Line is 23km away from the center of the ice-covered section, the value of _α2 is directly read as 1.05 from the figure.

(3) When the degraded parameter is in the special evaluation period or special evaluation section at the same time, the coefficient factor with a larger value is substituted into the calculation formula of the actual weight, so the actual coefficient factor α=1.2.

Calculate the actual weight and actual basic deduction value of the three degraded parameters, as shown in Table 6 below:

Table 6 Parameter deduction value

The calculated total penalty for the wires of the part is 80.6, so the wires are given a score of 19.4.

According to inspection records, there is no deduction of points for other components, so the score for other components is 100 points.

2. Calculate the score value of the tower segment

The weight and score of each sub-component are weighted to obtain the total score value of the base tower segment, as shown in Table 7 below:

Table 7 Scores of each sub-component

sequence Parts Subcomponent weight (P) Score by component Weighted by component 1 Base 0.1 100 10 2 tower 0.1 100 10 3 guide, ground 0.2 19.4 3.88 4 insulator 0.15 100 15 5 Goldware 0.15 100 15 6 G 0.1 100 10 7 Affiliated Facilities 0.1 100 10 8 channel environment 0.1 100 10

Therefore, the score of the #230~#231 tower section of Guishan Jia Line is S=84.

3. Calculate the overall score of the line

Guishan Jia Line #228～#231, which are adjacent to the 4 base tower sections, all have similar inspection phenomena. Similarly, the scores of these 4 base tower sections are all 84 points.

According to the formula for calculating the overall score of the line, the total score of the line is T=84.

4. Comprehensively judge the overall status of power transmission equipment

First of all, combined with the total score of 84 points and the status score table, it can be judged that the line is in an "abnormal" state.

Secondly, since the Guishan Line A is in a special evaluation period (the period of frequent icing), and the degraded conductors are in the special evaluation section (the section of frequent icing), the three factors of line score, time and space should be combined. Dimensions evaluate the power transmission equipment as a whole. Corresponding to the evaluation principle in step S3 that "when any line has 3 bases and above tower sections, the score is in an abnormal state, regardless of the score of the sub-components of the line and the total score of the line, the overall evaluation of the line is in an abnormal state." The line is in an "abnormal" state.

Finally, it is concluded that the state evaluation result of the transmission line is "abnormal", indicating that the state quantity of the line has deteriorated slightly, and the overall performance of the operating state is not good. We should pay close attention to its subsequent state development and arrange maintenance as soon as possible.

The actual situation of this section of the transmission line is: at that time, it was snowing heavily in winter, and the thickness of the ice coating on the transmission line was close to the design value. The section of wire has previously been repaired with respect to splicing fittings and repairing broken strands of the wire. Based on the above actual conditions, it can be judged that some important state quantities of this section of the transmission line have approached or slightly exceeded the standard value, and the operation should be monitored, and maintenance needs to be arranged as soon as possible. This is consistent with the conclusions drawn by the evaluation method in the present invention.

5. Comparison with the evaluation results of other methods

If only the deduction value of the line under normal time period is considered, and the two dimensions of time period and section are not comprehensively evaluated, the score of the wire part is: Q=100-(4×4+4×5+4× 5) = 44

The tower segment score is: S＝88.8

The total score of the line is: S＝88.8

According to the total score of the line, the conclusion is that the power transmission equipment is in the "attention" state, and only needs to pay attention to its operation in real time, and maintain it regularly according to the plan. Obviously, this conclusion is inconsistent with the actual situation. Therefore, through the comparison of the two methods, using the multi-dimensional analysis method can more objectively reflect the impact of some parameters of the transmission equipment deviating from the normal value on the overall state than only considering the line score, and the evaluation results will be closer to the actual operating state.

Claims (3)

1. a kind of appraisal procedure of various dimensions transmission facility state, this method comprise the following steps：

Step S1, establish the state evaluation model with multi-layer framework, asserted state evaluating system；

Step S2, defines the special evaluation period and special track section, combining assessment period and the two dimensions of track section are true Each parameter actual weight and actual deduction of points value are found；

Step S3, each sub-unit of transmission facility, tower position section, line are calculated according to the actual weight of parameter and actual deduction of points value successively The overall score value in road, and the integrality of the two dimension Comprehensive Evaluation transmission facilities of combining assessment period and evaluation section；

Characterized in that, special evaluation period and special track section are defined, when the evaluation of circuit is to be in special evaluation When section or special track section, increase and abnormal quantity of state weight and deduction of points value occur, the step S2 is specifically：

1. by the distribution of circuit failure over the years, external force, environment be distributed statistical analysis, when establishing the special evaluation of transmission facility Section and special track section；

The described special evaluation period refers to that thunderbolt take place frequently period, the icing of period, mountain fire that take place frequently takes place frequently period, typhoon when taking place frequently Section, bird pest take place frequently the period, external force destroy take place frequently the period；

Described special track section refers to that thunderbolt section, mountain fire take place frequently section, the typhoon of section, icing that take place frequently that take place frequently takes place frequently area Take place frequently section, external force of section, bird pest is destroyed and taken place frequently section；

2. determined according to country and professional standard under normal evaluation period and normal evaluation section in state evaluation parameter system Each parameter evaluation criterion, the coefficient factor of special evaluation period and the coefficient factor of special track section are set；

3. calculate the special quantity of state weight evaluated under the period and quantity of state deduction of points value, formula substantially is as follows：

λ₂=α₁*λ₁

In formula：λ₁For quantity of state weight under the normal evaluation period, λ₂For quantity of state weight under the special evaluation period；

K₂=α₁*K₁

In formula：K₁Quantity of state deduction of points value substantially, K under regular time periods₂For quantity of state deduction of points value substantially under the special evaluation period；α₁For The coefficient factor of special evaluation period, its distribution function drawn by the statistics of line fault over the years, defect monthly frequency, The different special evaluation periods correspond to different distribution functions；

4. calculate quantity of state weight under special track section and quantity of state deduction of points value, formula substantially is as follows：

λ₃=α₂*λ₁

In formula：λ₃For quantity of state weight under special track section；

K₃=α₂*K₁

In formula：K₃For the deduction of points value substantially of quantity of state under special track section；α₂For the coefficient factor of special track section, it is distributed Function is shown that different special track sections correspond to different distribution letters by the statistical analysis of failure dot density in Frequent Troubles region Number；

5. the quantity of state weight and quantity of state deduction of points value substantially simultaneously under special evaluation period and special track section are calculated, it is public Formula is as follows：

λ=α * λ₁

In formula：λ is quantity of state weight under special evaluation period and special track section；

K=α * K₁

In formula：K is quantity of state deduction of points value substantially under special evaluation period and special track section；Actual coefficients factor-alpha=α₁*α₂。

2. the appraisal procedure of transmission facility state according to claim 1, it is characterised in that described in the step S1 State evaluation model be by transmission facility part, overall three analysis levels of tower position section and circuit, and appraisal of equipment period and The dimensional information of device space position two is formed；

Described state evaluation parameter system is made up of component layer and parameter layer, component layer be divided into basis, shaft tower, wire, absolutely 8 edge, gold utensil, earthing or grounding means, affiliated facility, channel environment parts, parameter layer are parameter corresponding to each part, altogether 54 It is individual.

3. the appraisal procedure of transmission facility state according to claim 1, it is characterised in that the step S3 includes：

Theoretical with multi dimensional analysis, combined circuit entirety score, evaluation period, these three dimension Comprehensive Evaluations of track section are defeated The integrality of electric equipment；Under normal circumstances according to abnormality in the overall score value of circuit and circuit particular time, section List provides circuit integrality grade, when circuit is in special evaluation period or special track section, considers to go out in circuit The quantity of state that now deteriorates and the more base tower position sections for considering adjacent appearance degradation phenomena, and circuit integrality grade is reduced, It is in particular in：

A. when the overall score value of circuit shows as normal or attention state and is not in the presence of in table 4 listed, then this bar line The road overall evaluation is normal condition；

B. when all sub-units are scored at normal or attention state, but it is in the presence of in table 4 one of listed, then this circuit is whole Body is evaluated as abnormality；

C. when any circuit has 5 bases and above tower position section is scored at attention state, no matter circuit sub-unit score and circuit it is total It is scored at how many, the circuit overall evaluation is attention state；

D. when any circuit has 3 bases and above tower position section is scored at abnormality, no matter circuit sub-unit score and circuit it is total It is scored at how many, the circuit overall evaluation is abnormality；

E. when any circuit has 1 base and above tower position section is scored at severe conditions, no matter circuit sub-unit score and circuit it is total It is scored at how many, the circuit overall evaluation is severe conditions；

Abnormal state list in the circuit particular time of table 4, section