CN105974284A - External insulation configuration method for EHV (extra-high voltage) icing region - Google Patents
External insulation configuration method for EHV (extra-high voltage) icing region Download PDFInfo
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- CN105974284A CN105974284A CN201610483411.XA CN201610483411A CN105974284A CN 105974284 A CN105974284 A CN 105974284A CN 201610483411 A CN201610483411 A CN 201610483411A CN 105974284 A CN105974284 A CN 105974284A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
Abstract
The invention relates to an external insulation configuration method for an EHV (extra-high voltage) icing region, and the method comprises the steps: calculating the withstand voltage of an insulator under the actual conditions according to the standard deviation of a comprehensively corrected flashover voltage and the withstand voltage of the insulator; and carrying out the configuration of the external insulation of the icing region according to the withstand voltage. The method reduces the icing flashover accidents of a power transmission line, and improves the operation stability of the power transmission line.
Description
Technical field
The present invention relates to electric power application, refer in particular to extra-high voltage Ice Area external insulating level method.
Background technology
Insulator has the anti-pollution characteristic of excellence, can remain preferable insulating properties for a long time and safe operation, be widely used in power system in filthy, high humidity environment, and the stable operation to transmission line of electricity has indispensable effect.
East China and the winter-spring season of northern territory, the most in recent years due to increasing environmental pollution, the temperature phenomenon less than 0 DEG C the most repeatedly occurs and the persistent period is long, and the water droplet in air is when 0 DEG C or lower and when insulator surface collides and freezes, icing phenomenon will be produced at insulator surface, even can form, time serious, the icicle running through whole insulator, when temperature goes back up to more than zero centigrade, icing starts to melt, the frozen water melted drops down under insulator chain edge, form continuous print frozen water stream, the icing flashover causing the insulator i.e. insulator of short circuit tripping operation brings serious infringement to transmission system.Insulator surface is by after icing, and the dielectric strength of insulator declines, and leakage distance shortens.In deicing processes, the moisture film on ice body surface or ice crystal surface can quickly dissolve the electrolyte in dunghill, and improve ice-melt water or the conductivity of ice face moisture film, cause the distortion (but also distortion that monolithic insulator surface voltage can be caused to be distributed) of insulator chain voltage's distribiuting, insulator chain two ends particularly high-voltage connection end insulator bears that voltage percent is the highest thus flashover voltage of--icing insulator string is the lowest, ultimately causes ice sudden strain of a muscle accident.China is vast in territory, and weather conditions are complicated, affected by factors such as temperature, humidity, cold and heat air and circulation, and transmission line of electricity often occurs icing phenomenon and occurs in that substantial amounts of icing flashover accident.
Summary of the invention
To this end, the technical problem to be solved is to overcome the problem of transmission line of electricity generation icing flashover accident in prior art thus provides a kind of extra-high voltage Ice Area external insulating level method that can effectively overcome icing flashover accident.
For solving above-mentioned technical problem, a kind of extra-high voltage Ice Area external insulating level method of the present invention, the flashover voltage of the insulator utilizing experiment condition to obtain calculates described insulator withstanding voltage under physical condition, comprises the steps: step S1: analyze the distribution situation of filthy composition, pollution level and the filth on--icing insulator surface according to operating insulator, not charged insulator nature ice-coating test and insulator charged natural ice-coating test；Step S2: determine insulator contamination composition, pollution degree and filthy unevenness equivalent token state in test；Step S3: described equivalent token state carry out correlation test determine the filthy composition of insulator, pollution degree, filthy unevenness and height above sea level respectively with the relation of flashover voltage, then described flashover voltage is carried out comprehensive modification；Step S4: determine the standard deviation of described insulator withstanding voltage；Step S5: according to insulator withstanding voltage under physical condition described in the standard deviation calculation of the flashover voltage after comprehensive modification and described insulator withstanding voltage；Step S6: carry out the configuration of Ice Area external insulation according to described withstanding voltage.
In one embodiment of the invention, in described step S3, analyze the filthy composition of described insulation edge sub-surface and drawn the relation of filthy composition and flashover voltage by correlation test.
In one embodiment of the invention, described filthy composition includes calcium sulfate and sodium chloride.
In one embodiment of the invention, in described step S3, carry out the covering ice for insulator flashover test of the different close condition of salt thus draw the relation of insulator dirty degree and flashover voltage.
In one embodiment of the invention, in described step S3, by the filthy distribution situation of described insulator surface and draw filthy unevenness and the relation of flashover voltage by correlation test.
In one embodiment of the invention, in described step S3, under the conditions of Different Altitude, carry out the icing flashover test of insulator thus draw the relation of height above sea level and flashover voltage.
In one embodiment of the invention, in described step S3, according to described filthy composition, pollution degree, filthy unevenness and height above sea level, the correction factor of described flashover voltage is realized the comprehensive modification of described flashover voltage.
In one embodiment of the invention, described step S4 is determined the standard deviation of described insulator withstanding voltage according to great number tested data statistical result.
In one embodiment of the invention, described step S5 also needs to the standard deviation of revised flashover voltage and described insulator withstanding voltage under comprehensive physical condition and calculates described insulator withstanding voltage under physical condition again.
In one embodiment of the invention, in described step S6, the configuration of Ice Area insulator includes the classification of insulator, material, serial type, string length and arrangement.
The technique scheme of the present invention has the advantage that compared to existing technology
Extra-high voltage Ice Area of the present invention external insulating level method, insulator withstanding voltage under physical condition described in standard deviation calculation according to the flashover voltage after comprehensive modification and described insulator withstanding voltage, so that it is determined that go out highest operating voltage, it is ensured that the stable operation of transmission line of electricity；Carry out the configuration of Ice Area external insulation according to described withstanding voltage, thus decrease the generation of powerline ice-covering flashover fault.
Accompanying drawing explanation
In order to make present disclosure be more likely to be clearly understood, below according to the specific embodiment of the present invention and combine accompanying drawing, the present invention is further detailed explanation, wherein
Fig. 1 is the flow chart of extra-high voltage Ice Area of the present invention external insulating level method.
Detailed description of the invention
Refer to shown in Fig. 1, the present embodiment provides a kind of extra-high voltage Ice Area external insulating level method, the flashover voltage of the insulator utilizing test to obtain calculates described insulator withstanding voltage under physical condition, comprises the steps: step S1: analyze the distribution situation of filthy composition, pollution level and the filth on--icing insulator surface according to operating insulator, not charged insulator nature ice-coating test and insulator charged natural ice-coating test；Step S2: determine insulator contamination composition, pollution degree and filthy unevenness equivalent token state in test；Step S3: apply described equivalent token state carry out correlation test determine the filthy composition of insulator, pollution degree, filthy unevenness and height above sea level respectively with the relation of flashover voltage, then described flashover voltage is carried out comprehensive modification；Step S4: determine the standard deviation of described insulator withstanding voltage；Step S5: according to insulator withstanding voltage under physical condition described in the standard deviation calculation of the flashover voltage after comprehensive modification and described insulator withstanding voltage；Step S6: carry out the configuration of Ice Area external insulation according to described withstanding voltage.
Above-mentioned is core technology field of the present invention, extra-high voltage Ice Area of the present invention external insulating level method, the flashover voltage of the insulator utilizing test to obtain calculates described insulator withstanding voltage under physical condition, concrete, in described step S1, analyze the distribution situation of filthy composition, pollution degree and the filth on--icing insulator surface according to operating insulator, not charged insulator nature ice-coating test and insulator charged natural ice-coating test, be conducive to analyzing filth under test conditions；In described step S2, determine insulator contamination composition, pollution degree and filthy unevenness equivalent token state in test, thus be conducive to simulating filth under experimental conditions；In described step S3, apply described equivalent token state carry out correlation test determine the filthy composition of insulator, pollution degree, filthy unevenness and height above sea level respectively with the relation of flashover voltage, then described flashover voltage is carried out comprehensive modification, draw the flashover voltage of described insulator under experiment condition；In described step S4, determine the standard deviation of described insulator withstanding voltage, thus be conducive to determining the withstanding voltage of insulator described in actual environment；In described step S5, according to insulator withstanding voltage under physical condition described in the standard deviation calculation of the flashover voltage after comprehensive modification and described insulator withstanding voltage, so that it is determined that go out highest operating voltage, it is ensured that the stable operation of transmission line of electricity；In described step S6, carry out the configuration of Ice Area external insulation according to described withstanding voltage, thus effectively reduce the generation of powerline ice-covering flashover fault.
In described step S1, the filthy situation reflecting described insulator that can be complete according to operating insulator, not charged insulator nature ice-coating test and insulator charged natural ice-coating test, is conducive to the most comprehensively analyzing the distribution situation of filthy composition, pollution level and the filth on--icing insulator surface.
In described step S2, determine insulator contamination composition, pollution degree and filthy unevenness equivalent token state in test, be conducive to simulating filth under experimental conditions by described equivalent token state.
In described step S3, according to described equivalent token state carry out correlation test determine the filthy composition of insulator, pollution degree, filthy unevenness and height above sea level respectively with the relation of flashover voltage, specifically, analyze the filthy composition of described insulation edge sub-surface, the equivalent token state of application correspondence carries out correlation test can show that the relation of filthy composition and flashover voltage, described filthy composition include calcium sulfate and sodium chloride.Carry out the covering ice for insulator flashover test of the different close condition of salt, draw the relation of insulator dirty degree and flashover voltage.By the filthy distribution situation of described insulator surface, the equivalent token state of application correspondence carries out correlation test can draw the relation of filthy unevenness and flashover voltage.Under the conditions of Different Altitude, carry out the icing flashover test of insulator, draw the relation of height above sea level and flashover voltage, so that it is determined that each factor of influence and the relation of described flashover voltage.After determining the relation of each factor of influence and described flashover voltage, in order to accurately calculate described insulator withstanding voltage under physical condition, need described flashover voltage is carried out comprehensive modification, and according to described filthy composition, pollution degree, filthy unevenness and height above sea level, the correction factor of described flashover voltage is realized the comprehensive modification of described flashover voltage.Specifically, if with U50Represent the flashover voltage after comprehensive modification, U50%Representing the flashover voltage under current altitude, K1, K2, K3, K4 represent pollution degree, filthy composition, filthy unevenness and the height above sea level correction factor to icing flashover voltage, then U respectively50=K1*K2*K3*K4*
U50% 。
Described step S4 determines the standard deviation of described insulator withstanding voltage according to great number tested data statistical result, be conducive to calculating described insulator withstanding voltage under physical condition accurately by described standard deviation, so that it is determined that go out highest operating voltage, it is ensured that the stable operation of transmission line of electricity.
Described step S5 also needs to the standard deviation of revised flashover voltage and described insulator withstanding voltage under comprehensive physical condition and calculates described insulator withstanding voltage under physical condition again.Specifically, if setting described insulator withstanding voltage under physical condition as UW, then UW=U50(1-n σ), the safety coefficient under wherein n represents insulator physical condition, by industry standard formulation, σ represents the standard deviation of withstanding voltage.
In described step S6, the configuration of Ice Area external insulation includes the classification of insulator, material, serial type, string length and arrangement, such that it is able under conditions of highest operating voltage, configure the classification of described insulator, material, serial type, string length and arrangement, it is made that contribution greatly, it is ensured that the stable operation of transmission line of electricity to reducing icing flashover accident.
To sum up, technical scheme of the present invention has the advantage that
Extra-high voltage Ice Area the most of the present invention external insulating level method, in described step S1, analyze the distribution situation of filthy composition, pollution level and the filth on--icing insulator surface according to operating insulator, not charged insulator nature ice-coating test and insulator charged natural ice-coating test, be conducive to analyzing filth under test conditions；In described step S2, determine insulator contamination composition, pollution degree and filthy unevenness equivalent token state in test, thus be conducive to simulating filth under experimental conditions；In described step S3, apply described equivalent token state carry out correlation test determine the filthy composition of insulator, pollution degree, filthy unevenness and height above sea level respectively with the relation of flashover voltage, then described flashover voltage is carried out comprehensive modification, draw the flashover voltage of described insulator under experimental condition；In described step S4, determine the standard deviation of described insulator withstanding voltage, thus be conducive to determining the withstanding voltage of insulator described in actual environment；In described step S5, according to insulator withstanding voltage under physical condition described in the standard deviation calculation of the flashover voltage after comprehensive modification and described insulator withstanding voltage, so that it is determined that go out highest operating voltage, it is ensured that the stable operation of transmission line of electricity；In described step S6, carry out the configuration of Ice Area external insulation according to described withstanding voltage, thus effectively reduce the generation of icing flashover accident.
Extra-high voltage Ice Area the most of the present invention external insulating level method, the configuration of described Ice Area external insulation includes the classification of insulator, material, serial type, string length and arrangement, such that it is able under conditions of highest operating voltage, configure the classification of described insulator, material, serial type, string length and configuration mode, it is made that contribution greatly, it is ensured that the stable operation of transmission line of electricity to reducing icing flashover accident.
Obviously, above-described embodiment is only for clearly demonstrating example, the not restriction to embodiment.For those of ordinary skill in the field, the change of other multi-form or variation can also be made on the basis of the above description.Here without also cannot all of embodiment be given exhaustive.And the obvious change thus extended out or variation still in the protection domain of the invention among.
Claims (10)
1. an extra-high voltage Ice Area external insulating level method, the flashover voltage of the insulator utilizing test to obtain calculates described insulator withstanding voltage under physical condition, it is characterised in that comprise the steps:
Step S1: analyze the distribution situation of filthy composition, pollution level and the filth on--icing insulator surface according to operating insulator, not charged insulator nature ice-coating test and insulator charged natural ice-coating test；
Step S2: determine insulator contamination composition, pollution degree and filthy unevenness equivalent token state in test；
Step S3: apply described equivalent token state carry out correlation test determine the filthy composition of insulator, pollution degree, filthy unevenness and height above sea level respectively with the relation of flashover voltage, then described flashover voltage is carried out comprehensive modification；
Step S4: determine the standard deviation of described insulator withstanding voltage；
Step S5: according to insulator withstanding voltage under physical condition described in the standard deviation calculation of the flashover voltage after comprehensive modification and described insulator withstanding voltage；
Step S6: carry out the configuration of Ice Area external insulation according to described withstanding voltage.
Extra-high voltage Ice Area the most according to claim 1 external insulating level method, it is characterised in that: in described step S3, analyze the filthy composition of described insulation edge sub-surface and drawn the relation of filthy composition and flashover voltage by correlation test.
Extra-high voltage Ice Area the most according to claim 2 external insulating level method, it is characterised in that: described filthy composition includes calcium sulfate and sodium chloride.
Extra-high voltage Ice Area the most according to claim 1 external insulating level method, it is characterised in that: in described step S3, carry out the covering ice for insulator flashover test of the different close condition of salt thus draw the relation of insulator dirty degree and flashover voltage.
Extra-high voltage Ice Area the most according to claim 1 external insulating level method, it is characterised in that: in described step S3, by the filthy distribution situation of described insulator surface and draw filthy unevenness and the relation of flashover voltage by correlation test.
Extra-high voltage Ice Area the most according to claim 1 external insulating level method, it is characterised in that: in described step S3, under the conditions of Different Altitude, carry out the icing flashover test of insulator thus draw the relation of height above sea level and flashover voltage.
7. according to extra-high voltage Ice Area external insulating level method any one of in claim 1 to 6, it is characterized in that: in described step S3, according to described filthy composition, pollution degree, filthy unevenness and height above sea level, the correction factor of described flashover voltage is realized the comprehensive modification of described flashover voltage.
Extra-high voltage Ice Area the most according to claim 1 external insulating level method, it is characterised in that: described step S4 is determined the standard deviation of described insulator withstanding voltage according to great number tested data statistical result.
Extra-high voltage Ice Area the most according to claim 1 external insulating level method, it is characterised in that: described step S5 also needs to the standard deviation of revised flashover voltage and described insulator withstanding voltage under comprehensive physical condition and calculates described insulator withstanding voltage under physical condition again.
Extra-high voltage Ice Area the most according to claim 1 external insulating level method, it is characterised in that: in described step S6, the configuration of Ice Area insulator includes the classification of insulator, material, serial type, string length and arrangement.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610483411.XA CN105974284A (en) | 2016-06-27 | 2016-06-27 | External insulation configuration method for EHV (extra-high voltage) icing region |
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| CN201610483411.XA CN105974284A (en) | 2016-06-27 | 2016-06-27 | External insulation configuration method for EHV (extra-high voltage) icing region |
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