96 results about "Salt deposit density" patented technology

The invention relates to a pollution flashover index forecasting method for a regional power grid, belonging to the technical field of transmission and distribution monitoring. The method of the invention comprises the following steps: (1) forecasting the current value of the equivalent salt deposit density in real time by an insulator surface equivalent salt deposit density forecasting model; (2) forecasting pollution flashover critical voltage by an insulator pollution flashover critical voltage forecasting model; (3) forecasting the insulator pollution flashover index of the power grid by a pollution flashover graded forecasting and prewarning model; and (4) judging the state. The invention has the advantages of providing a multivariable equivalent salt deposit density time sequence forecasting model based on phase space reconstruction, solving by a supporting vector machine model, solving the forecasting problem under the conditions of small sample of equivalent salt deposit density data and noise, and improving the forecasting prediction.

The invention discloses a method for safe region evaluation of the filthy degree of an electric transmission line insulator. At present, most electric transmission line operation and maintenance units directly adopt an equivalent salt deposit density comparison method which has certain limitations. According to the method for safe region evaluation of the filthy degree of the electric transmission line insulator, through statistics and analysis of the distribution rule of dust density / equivalent salt deposit density ratios of the hot-line work insulator, the quantization relationship between the flashover voltage and the equivalent salt deposit density and dust density of the surface of the hot-line work insulator is obtained through experimental investigation; factors such as flashover voltage with 50% flashover probability, insulator serial type and the highest operation voltage of a transmission line are considered comprehensively, a safe region graph of the filthy degree of the electric transmission line insulator is drawn, and then the safety regions of various filthy degrees are obtained; the influence of the equivalent salt deposit density and dust density of the surface of the insulator are considered comprehensively, the structural type difference of insulators is considered, and therefore safe region evaluation of the filthy degree of the electric transmission line insulator can be achieved more accurately and visually.

The invention relates to a configuration method of a high-voltage transmission line insulator, belonging to the technical field of transmission line insulation design of a power system. The method comprises the steps as follows: firstly, a mapping table is established according to the existing experience or the corresponding standards, thereby estimating the string length of the insulator to be selected, wherein the insulator is needed in line design; the insulator to be configured is chosen according to the string length of the insulator in the mapping table and mechanical requirements; for a specific insulator to be configured, the salt deposit density of the operated insulator is calculated and the pollution flashover voltage is acquired by the data of the pollution test; in consideration of revisions of a plurality of affection factors, the withstand voltage of the insulator to be configured is calculated and the string length of the insulator is determined according to the target voltage of the line to be designed; and finally, the string length and the string length threshold in the mapping table are calibrated, thereby determining final insulation configuration result. The method realizes two functions of insulator type selecting and size configuration and directly uses the results of the pollution test to calculate, so as to ensure the precision and reliability of insulator configuration to meet the requirements on line pollution outer insulation design.

Contamination monitoring of high voltage insulators provides a system and method producing an early predictor for high voltage insulator failure, allowing repairmen to either already be on site when a high voltage insulator fails in order to expedite repair time, or allowing repair and / or replacement of a faulty insulator before the failure actually occurs. The system and method provide transmission of an alarm signal when contaminant levels (such as equivalent salt deposit density (ESDD) levels) formed on a high voltage insulator exceed pre-selected threshold values, indicating the likelihood of high voltage insulator failure.

The invention discloses a method for testing natural pollution characteristics of a high-voltage external-insulation device. The method comprises the following steps of: acquiring to-be-tested natural pollution on the high-voltage external-insulation device; testing equivalent salt deposit density and dust density to the to-be-tested natural pollution; testing at least one of the to-be-tested natural pollution: pollution ingredient, pollution granularity, pollution morphology, pollution thermal weight and pollution infrared spectroscopy. In the scheme, the pollution level can be confirmed by testing equivalent salt deposit density and dust density of the natural pollution; at least one of ion, concentration, particle granularity, topographic characteristics, heat stability, chemical bond information or functional group information included in the natural pollution can be obtained by testing at least one of pollution ingredient, pollution granularity, pollution morphology, pollution thermal weight and pollution infrared spectroscopy, so that the natural pollution characteristics on the device surface can be comprehensively tested.

The invention provides a method for measuring equivalent salt deposit density of a high-voltage insulator. The method comprises the following steps of uniformly dividing the surface of a high-voltage insulator needing to be detected into multiple regions, selecting any measurement point in each one of the multiple regions, eliminating hydrophobicity of the measurement points, spraying a water film on the measurement points without hydrophobicity, measuring local surface conductivity of the measurement points, calculating average local surface conductivity by the local surface conductivity of the measurement points, and calculating equivalent salt deposit density of the high-voltage insulator by the average local surface conductivity. The method realizes measurement of equivalent salt deposit density of a high-voltage insulator having a strong-hydrophobicity surface without destroy on an insulator dirt layer structure. Through the method, a researcher can carry out long-term measurement of the same measurement points. The method is convenient for summarization of a dirt accumulation law, avoids errors caused by other methods in transport and improves measurement accuracy.

The invention discloses a post insulator contamination degree recognition method. The post insulator contamination degree recognition method comprises the following steps of 1 periodically monitoring and storing a leakage current amplitude of a post insulator and temperature, humidity and rainfall of an environment; 2 selecting multiple leakage current amplitude data and multiple environment humidity data in an effective time period, substituting the data into a model formula (shown in the description) and obtaining a first characteristic coefficient a and a second characteristic coefficient b through model formula fitting, wherein Im represents the leakage current amplitude, RH represents environment humidity, the first characteristic coefficient a is greater than 0, and the second characteristic coefficient b is greater than 0; 3 substituting the second characteristic coefficient b into a pre-equivalent salt deposit density prediction model and a contamination degree prediction model to obtain the equivalent salt deposit density and the contamination degree of the surface of the insulator corresponding to the second characteristic coefficient b. By means of the post insulator contamination degree recognition method, accuracy is high, a monitoring device is simple, real-time online monitoring can be achieved, reduction of power system working amount is facilitated, and contamination flashover risk is reduced.

The invention discloses a metal dust pollution on-line monitoring device for an insulator. The metal dust pollution on-line monitoring device for an insulator comprises a state monitoring device, a wind speed and wind direction sensor, a rainfall sensor and a temperature and humidity sensor, wherein the wind speed and wind direction sensor, the rainfall sensor and the temperature and humidity sensor are connected with the state monitoring device; the state monitoring device includes a microcontroller, a data storage unit and a dust concentration sensor; the data storage unit and the dust concentration sensor are connected with the microcontroller; the state monitoring device is also connected with a system power supply and a GPRS / 3G communication module; the GPRS / 3G communication module is connected with a background monitoring center and the system power supply; and the wind speed and wind direction sensor, the rainfall sensor and the temperature and humidity sensor are connected with the microcontroller. The metal dust pollution on-line monitoring device for an insulator solves the problems that a leakage current method in the prior art is easily interfered by electromagnetism so that misdeclaration and declaration failure is easy to occur, or a fiber salt deposit density monitoring method cannot reflect the accumulated degree of metal dust for the special environment of steel works, and cannot accurately monitor the pollution degree of an insulator of the steel works. The invention discloses a monitoring method by using the metal dust pollution on-line monitoring device for an insulator.

The invention discloses a method for researching the pollution flashover characters of natural pollutant retention insulators by considering pollution conversion coefficient. In the conventional method, as for a charged insulator string acquired on a same base iron tower, a part of insulators are selected to be subjected to a pollution degree test, other insulators are subjected to a pollution flashover voltage test, and data analysis is carried out on the basis; and the conventional method has certain limitation. The method for researching the pollution flashover characters of the natural pollutant retention insulator is characterized by comprising the following steps of: separating the natural pollutant retention insulators acquired from the same base iron tower into two parts, wherein one part is used for the test analysis of surface equivalent salt deposit density and dust density, and the other part is used for a pollution flashover test; for considering the loss of partial pollutants positioned on the surfaces of the insulators in a pollution flashover process, correcting the pollution degree test data of the insulators after the insulators are subjected to the pollution flashover test; and carrying out regression analysis on the data of pollution flashover voltage, equivalent salt deposit density, whole wafer dust density and the equivalent salt deposit density ratio of upper and lower surfaces on the basis. In the invention, the functional relationship of the pollution flashover voltage of a natural pollutant retention insulator string and the surface pollution degree of the insulators can be more effectively obtained.

The invention discloses a monitoring apparatus of a nearby environment of a power transmission line. The monitoring apparatus is characterized in that the monitoring apparatus is constructed in such a way that a shooting probe and a multispectral infrared radar are respectively accessed to a monitoring host, and the monitoring host, after filtering a high-temperature infrared radiation source and the narrow waveband of background radiation, determines the existence of a forest fire in a surrounding environment through image analyzing; the monitoring host is connected with an air suction pipe through a cloud chamber, performs humidifying heating sampling on surrounding air, counts the quantity of drops in a unit area and gives an early warning when the quantity exceeds a preset threshold value; and the monitoring host is simultaneously connected with a light sensor for measuring a quartz rod in the atmosphere and measuring loss of luminous energy, and calculates salt deposit density. According to the invention, a potential mountain fire hidden risk and an existing mountain fire condition around the power transmission line are predicted in advance, through capturing near-distance space fire information of the power transmission line, a first point is timely discovered, power is actively cut off for avoiding a fire, and tripping events due to the mountain fire can be reduced.

The invention relates to an analyzing and processing method for test data of manual pollution flashover of an insulator based on a steady regression algorithm. At present, the least square method used to determine the flashover voltage is only adaptive to the condition that test data dependency is higher, and easy to exaggerate the influence of a singular value in the test data, thereby increasing the statistic error, so that the regression equation is short of steadiness. The invention provides the analyzing and processing method for test data of manual pollution flashover of the insulator. The method is characterized by comprising the steps of: solving a regression coefficient by a reweighted least square iterative algorithm according to the salt deposit density, and ash density on the surface of the insulator and the voltage test data of the pollution flashover; adopting the weighting function in iterative calculation, wherein the weighting coefficient is the residual function iterated last time so as to reduce the influence of the singular value on the regression coefficient; and mapping a salt density influence characteristic index and an ash density influence characteristic index by the regression coefficient and predicting the pollution flashover voltage of the insulator. The method provided by the invention improves the predicting precision of the pollution flashover voltage and effectively eliminates the interference of abnormal data.

The invention discloses a method for analyzing and simulating the degree of contamination in regions where power transmission and transformation equipment operates. The method for simulating contamination in regions where power transmission and transformation equipment operates comprises the following steps: step 1, selecting suspension insulators and collecting natural contamination in a to-be-analyzed area; step 2, separately subjecting collected natural contamination to testing of equivalent salt deposit density and non-soluble deposit density and to analysis of soluble ion components; step3, according to the analysis results of soluble ion components, selecting corresponding salt for cooperation with diatomite to prepare contamination liquid; step 4, adjusting the salinity of the contamination liquid, staining a test insulator, and making the equivalent salt deposit density and non-soluble deposit density of surface contamination of the test insulator to reach the equivalent saltdeposit density and non-soluble deposit density mentioned in the step 2 respectively so as to prepare simulated contamination.

The invention discloses a distributed optical fiber equal salt deposit density sensor and a sensing method thereof. The distributed optical fiber equal salt deposit density sensor comprises a light transmitting unit, a light modulating unit, a light receiving unit and a signal processing unit; integral information of the equal salt deposit density strength in areas where sensing optical fibers pass can be obtained by using the distributed optical fiber equal salt deposit density sensor according to the invention to perform one measurement, and the sensor has long system monitor range and high positioning accuracy. Simultaneously, the invention further provides a sensing method of the distributed optical fiber equal salt deposit density sensor, which includes simple steps and can conveniently measure the distribution information of the equal salt deposit density strength in target areas.

The invention discloses a method for measuring operating insulator contamination degree. The method includes: using alcohol containing absorbent cotton to scrub the foulant on the upper surface and lower surface of an insulator; determining the amount of distilled water or deionized water for washing the absorbent cotton, performing water equipartition to wash the absorbent cotton so as to reduce absorbent cotton foulant residue, and placing the foul solution in a foul solution memory; fully stirring the foul solution, and controlling the stirring time at 10min-30min; drying and weighing the filter paper used in filtration; filtering the foul solution with a filter unit, taking the filtered clear solution, and measuring the electric conductivity of the filtered clear solution to obtain the equivalent salt deposit density of the insulator; drying the filter paper, and weighing the dried filter paper, thus obtaining the insulator non-soluble deposit density. The method is simple, and employs the alcohol containing absorbent cotton to sample the insulator surface foulant. The absorbent cotton is washed repeatedly by water to reduce the absorbent cotton foulant residue, thus ensuring measurement precision. A vacuum pump is utilized to increase the foul solution filtration rate, thereby greatly reducing the foulant filtration time.

The invention discloses a method for measuring the contamination degree of the surface of an electric power insulator. The method comprises the following steps: scrubbing and sampling contaminants on the surface of the insulator with a cleaning and sampling cloth, weighing to obtain a mass difference m1 before and after sampling with the cleaning and sampling cloth, immersing the contaminant-contained sampling cloth after sampling into deionized water to dissolve soluble contaminants, measuring the conductivity of the resulting contaminant-containing deionized solution, converting to a soluble contaminant mass m2, converting to a salt deposit density, calculating to obtain the insoluble contaminant mass m1-m2, and converting to a dust density to obtain the contamination degree of the surface of the electric power insulator. Compared with the prior art, the method of the invention breaks measuring sequences of traditional measuring methods, uses drying and weighing to substitute filtering and drying in the traditional methods, and has the advantages of effective reduction of sampling and measuring errors, sampling and measuring period shortening, and convenience for grasp and popularization.

The invention relates to an insulator pollution degree evaluation method based on meteorological data statistics. The method is characterized by comprising the steps of 1, meteorological data statistics; 2, pollution accumulation process division; 3, salt deposit density change calculation; 4, pollution grade evaluation. The feasible and effective pollution degree evaluation method is provided for an electric transmission line insulator which lacks an online pollution monitoring device and is located in a high-pollution area, and the method is of great practical significance in anti-pollution flashover measure formulation and implementation based on the insulator pollution degree.

The invention discloses a converter station valve hall operation environment early warning method based on a time sequence and transverse comparison, and relates to the technical field of DC power transmission, and the method comprises the steps: obtaining historical environment parameters in a valve hall, and enabling the environment parameters to comprise but not to be limited to temperature, humidity, PM2.5 and salt deposit density; constructing a prediction model based on the valve hall environment parameter time sequence; training the prediction model according to the historical environment parameters; collecting environmental parameters in the current valve hall, and sending the environmental parameters to the prediction model to obtain environmental parameters at the next moment; carrying out early warning according to the obtained environmental parameters at the next moment; adopting a plurality of sensors in a converter valve hall to collect temperature and humidity of the valve hall, particles and pollution degree of the surface of a circuit board card. On the basis of online monitoring of the valve hall environment, analysis of monitoring data is performed, the valve hall environment is predicted by adopting a time sequence algorithm, and meanwhile, valve hall environment parameters at multiple positions are compared, so that the hidden danger of stable growth of themonitoring data can be further discovered.

The invention discloses a power transmission line fault monitoring device and method, and can carry out comprehensive monitoring on a fault state of a power transmission line. The device comprises a mountain fire monitoring unit, an ice coating monitoring unit, a dirty monitoring unit, a conductor galloping monitoring unit and a monitoring main station, wherein the mountain fire monitoring unit isused for monitoring whether an abnormal heat source exists in a power transmission line passage and tower region, if yes, timely carrying out fire extinguishing, and uploading monitored data to the monitoring main station; the ice coating monitoring unit is used for monitoring conductor tension and meteorological environment data near the line and uploading the monitored data and data monitored by the conductor galloping monitoring unit to the monitoring main station; the dirty monitoring unit is used for detecting equivalent salt deposit density data of an insulator of the power transmissionline and uploading the monitored data to the monitoring main station; the conductor galloping monitoring unit is used for monitoring galloping information of the line and transmitting the galloping information to the ice coating monitoring unit; and the monitoring main station is used for receiving the data monitored by the mountain fire monitoring unit, the ice coating monitoring unit, the dirtymonitoring unit and the conductor galloping monitoring unit and carrying out analysis on a condition of the power transmission line

The invention discloses an equivalent salt deposit density (ESDD) prediction and early warning system for a power insulator surface contaminant, which comprises four function units of a genetic algorithm training unit, a BP (Back Propagation) neural network training unit, a genetic BP neural network predication unit and an early warning unit. The genetic algorithm is good at global search, the BP neural network is good at local search, and thus, when the genetic algorithm and the BP algorithm are combined, the prediction accuracy can be improved, and the algorithm convergence rate is improved. The genetic algorithm firstly optimizes the initial weight of the neural network, good search space is positioned, and the BP algorithm is then adopted to search the optimal value in the small space. The application conditions are wide, the system can be applied to insulators of any types and is not influenced by different contaminant accommodation features due to different insulator types, and the prediction method and the early warning system can realize insulator ESDD prediction, and give contaminant flashover and early warning signals.

The invention discloses a measuring method and device for insulator surface equivalent salt deposit density. The method comprises steps as follows: S1, a pulse laser source is focused on the dirty surface of a to-be-detected insulator, the laser source emits laser with the pulse width smaller than or equal to 20 ns to induce dirty substances on the surface of the insulator to form plasma, and spectrum information emitted by the plasma in an expansion cooling process is acquired; S2, a relation model between the density of ions in common soluble salt in dirt on the insulator surface and spectral features after laser excites to generate plasma is established; S3, spectral information acquired in S1 is input into the relation model in S2, and the ion composition of the dirt substances on the surface of the to-be-detected insulator and ion density of various ions are analyzed; S4, the equivalent salt deposit density of the dirt substances is calculated according to the ion density of various ions. With the adoption of the measuring method and device, sampling while power outage is not required, and online measurement of dirt components and the equivalent salt deposit density can be realized.

The invention relates to an intelligent insulator salt deposit density online monitoring device. The device is structurally characterized in that an acquiring terminal is connected with a power supply, the acquiring terminal is used for analyzing and comparing acquired data, working out a measuring result and transmitting the measuring result to a data receiving working station or appointed mobile phone through a public mobile network; and the data receiving working station is connected to an MIS (Management Information System) network. The intelligent insulator salt deposit density online monitoring device has the beneficial effects of intelligently monitoring salt deposit density of an insulator in real time, immediately transmitting detection data to a working station database, and bringing the convenience for inquiry of an MIS computer through the MIS network. The problems of inaccurate and non-immediate measuring data, and the like of the existing insulator salt deposit density offline measurement are solved.

The invention discloses a transmission line area pollution severity characterization method. By adopting the method, the influence of environmental factors to the surface pollution and flashover characteristic of an insulator can be considered more comprehensively. On the basis of the clean fog effect, the influence of electrical conductivity fog to flashover voltage is considered, and the action result and original surface salt deposit density are combined as equivalent salt deposit density which is used as the basis of pollution severity classification. According to the classification method of the invention, electrical conductivity fog weather which is more and more frequent recently is considered as an environmental characteristic, and insulation configuration is arranged on the basis. Therefore, the occurrence of flashover accidents caused by sudden bad weather can be effectively reduced, and the safe and stable operation of the power grid is enhanced.

The invention discloses an insulator surface equivalent salt deposit density prediction system and method; the system comprises an original data acquisition unit, an adaptive variation particle swarm unit, a generalized regression nerve network prediction unit, an ESDD prediction output unit and an ESDD early warning unit; the collected insulator surface equivalent salt deposit density data and local meteorology data are inputted into the adaptive variation particle swarm unit; the adaptive variation particle swarm searches the generalized regression nerve network optimal smooth factor value in a global solution space, and outputs the factor value to the generalized regression nerve network prediction unit; the generalized regression nerve network prediction unit builds a prediction model according to the inputted optimal smooth factor value, the insulator surface equivalent salt deposit density data and local meteorology data, thus predicting the insulator surface equivalent salt deposit density; the ESDD prediction output unit outputs an ESDD value predicted by the model, thus providing references for power transmission line operation personnel; the ESDD early warning unit determines whether a preset graded early warning threshold is reached or not, and sends an early warning signal if needed.

The invention discloses a method for determining an effective utilization coefficient of a creep distance of a composite insulator. At present, the method for the effective utilization coefficient of the creep distance of the composite insulator does not consider a non-uniform characteristic of natural dirt retention of a control insulator and has a certain limitation. According to the method, by analyzing characteristics of equivalent salt deposit density and equivalent non-soluble deposit density of the upper and lower surfaces, subjected to the natural dirt retention, of the composite insulator and the control insulator, a dirt retention ratio of the composite insulator to the control insulator subjected to the natural dirt retention is obtained; according to a manual withstand pollution test result, flashover voltage characteristics of the composite insulator and the control insulator are obtained; and according to corresponding flashover voltages under different dirt retention conditions, the effective utilization coefficient of the creep distance of the composite insulator is obtained. According to the method, the influence of salt deposit density, non-soluble deposit density and dirt retention non-uniformity of the natural dirt retention of the insulator on the flashover voltage is considered, so that the effective utilization coefficient of the creep distance is ensured to be correctly calculated.

The invention discloses an electric insulator cleaning device which comprises a water channel, a connecting rod, a limiting column, a tension spring, an electric cleaning head, a flexible shaft, an electric cleaning arm, a stepping motor, a cleaning joint seat and an arm connection joint seat. One end of the connecting rod is fixed on the upper edge of the water channel, the limiting column is arranged on the upper edge of the water channel and located at the other end of the connecting rod, the rod body of the connecting rod is fixedly connected with one end of the tension spring, the other end of the tension spring is fixed on the upper edge of the water channel, the tension spring enables the connecting rod to be tightly attached to the limiting column, the electric cleaning head is connected with a cleaning joint above the water channel through the flexible shaft, the electric cleaning arm is arranged on the upper portion of the cleaning joint seat, and the stepping motor is used for driving the electric cleaning arm to rotate. The electric insulator cleaning device can clean an insulator and collect dirt on the surface of the cleaning head, salt deposit density of an insulator can be obtained and used for assessing the insulating property of the insulator of an electrical power system in a regional environment and the safety performance of a power grid, and the electric insulator cleaning device has good application prospects.

The invention relates to a method for determining the pollution grade change of a power grid theory. The method comprises the following steps: determining the air quality index P of power grid pollution area flashover features; determining an ESDD (Equivalent Salt Deposit Density); and reckoning a pollution grade change situation of the power grid theory in real time. The method considers that atmospheric pollutants in each area have certain difference and the influence degrees of SO2, NO2 and PM10 in the atmospheric pollutants in each area can not be identical, the method makes correction suggestions for an empirical formula, which is given by certain scientific research institution, between a salt density value and an atmospheric quality index, and main pollutant PM2.5 in the atmospheric pollution in recent years are brought into the empirical formula. An atmospheric environment parameter independent term including PM2.5 is established, an independent term selection method and principle are put forward to obtain the method for determining the pollution grade change of the power grid theory by the atmospheric environment parameters including PM2.5 and the like in real time.

The invention relates to a suspension device of an equivalent salt deposit density insulator. The suspension device comprises an equivalent salt deposit density insulator suspension plate and a fixing bolt assembly, the equivalent salt deposit density insulator suspension plate is of an integrally-formed n-shaped structure, a lifting lug is arranged on the upper portion of the equivalent salt deposit density insulator suspension plate, a suspension hole used for suspending an insulator string is formed in the lower portion of the equivalent salt deposit density insulator suspension plate, a plurality of transversely through fixing holes are formed in the middle of the equivalent salt deposit density insulator suspension plate, and the fixing bolt assembly is fixed in the corresponding fixing holes so that the equivalent salt deposit density insulator suspension plate and an iron tower crossarm can be relatively fixed. The application method includes the step that the fixing bolt assembly is combined with the corresponding fixing holes to be fixed. Compared with the prior art, the suspension device and the application method have the advantages that galvanized parts are adopted, strength is high, and corrosion resistance is good; the suspension device can be used for iron tower crossarms of various specifications, can be flexibly adjusted according to situations, and is convenient to use and firm and reliable in connection; the lifting lug is arranged on upper portion of the suspension plate, so that installation and adjustment are facilitated; machining is convenient, manufacturing cost is low, the labor intensity of operating personnel can be relieved, installation efficiency is improved, application prospects are broad, and promotion value is enormous.

The invention discloses a direct-current transmission conductor dirt evaluation method and system. Particulate matter will attract charged ions to become new charged corpuscles, and consequently an ion flow field of a direct-current transmission conductor becomes more complicated. The evaluation method comprises the steps that a to-be-evaluated conductor is selected, and air pollution indexes in atransmission conductor area and rainfall meteorological data in a corresponding time period in a to-be-evaluated conductor area are collected; for a whole dirt accumulation process, an accumulation-cleaning model is adopted to calculate the accumulation condition of pollution particles around the conductor on the conductor; the accumulation condition obtained through calculation is substituted into the accumulation-cleaning model, and a conductor dirt cleaning condition in the corresponding time period is obtained and converted into equivalent salt deposit density; and the equivalent salt deposit density is compared with standard salt deposit density, and the dirty level of the current direct-current transmission conductor is judged. According to the direct-current transmission conductordirt evaluation method and system, the changing condition of the ion flow field on the surface of the conductor is calculated through the air pollution indexes and the meteorological data and then converted into the changing condition of equivalent salt deposit density, and therefore the dirty condition of the conductor is judged.

The invention discloses a revise method for a polluted area distribution map of a composite insulator based on equivalent salt deposit density. The composite insulator comprises raw materials in parts by weight: 120-150 parts of chlorinated polyethylene rubber, 12-15 parts of a curing agent, 3-5 parts of an oxidant 1010, 5-8 parts of zinc stearate, 3-5 parts of an adjustor and 3-5 parts of a flame retardant. The composite insulator further comprises 5-8 parts of a functional material which comprises coco fatty acid diethanol amide and hydrogen peroxide. The invention discloses the composite insulator which is good in texture toughness, good in insulating property and long in service life and a detection method for equivalent salt deposit density. The insulator has excellent hydrophobicity, hydrophobic migration, high mechanical strength, good wear resistance and external destruction resistance, and can be used for satisfying the processing and operating requirements of the insulator.