CN106153097A - --icing insulator string icing degree characterizing method - Google Patents

--icing insulator string icing degree characterizing method Download PDF

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Publication number
CN106153097A
CN106153097A CN201610480318.3A CN201610480318A CN106153097A CN 106153097 A CN106153097 A CN 106153097A CN 201610480318 A CN201610480318 A CN 201610480318A CN 106153097 A CN106153097 A CN 106153097A
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China
Prior art keywords
insulator
icing
bridge joint
degree
ice
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CN201610480318.3A
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CN106153097B (en
Inventor
于昕哲
周军
姜艺楠
刘博�
徐跃能
邓禹
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shanxi Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shanxi Electric Power Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00Measuring or testing not otherwise provided for
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/08Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness

Abstract

The present invention relates to--icing insulator string icing degree characterizing method, according to the described iced insulator described covering ice for insulator bridge joint degree relative change rate of conversion, being corrected described covering ice for insulator bridge joint degree relative change rate then in conjunction with running environment, the ice covering thickness finally according to the covering ice for insulator bridge joint degree relative change rate after correction and described wire determines described covering ice for insulator bridge joint degree.The present invention is by ice covering thickness and the iced insulator of the described wire of measurement thus converses the icing bridge joint degree of described insulator, the problem that can not directly monitor described covering ice for insulator bridge joint degree when overcoming actual track monitoring, Efficient Characterization covering ice for insulator degree.

Description

--icing insulator string icing degree characterizing method
Technical field
The present invention relates to electric power application, refer in particular to--icing insulator string icing degree characterizing method.
Background technology
According to the general thought of State Grid Corporation of China's development extra-high voltage bulk transmission grid, by building the state of higher voltage grade Family's electrical network, promotes, across the great Qu two things diametrically opposed to each other across basin and larger range of most optimum distribution of resources, to meet the national economic development Need.It is long that super extra-high voltage alternating current-direct current transmission line of electricity has line route, passes through the feature of area surroundings complicated condition, can not keep away Exempt from through valley, the geographical environment of the various complexity such as river, microclimate, and the meteorological condition district that glaze and heavy snow etc. are severe Territory, and transmission line of electricity is while facing air and environmental pollution, also will be in the face of certain High aititude problem.Power transmission line Road icing and heavy snow phenomenon are one of the problems that have to consider of transmission line of electricity external insulation design, domestic and international longtime running and design Experience also indicates that, the external insulation reliability re-covering ice/snow district has become as the key factor of ultra-high-tension power transmission line external insulation design, Need to consider that the resistance to ice of insulator dodges/avenge sudden strain of a muscle ability when design.
The ice formation of China is generally according to the ice covering thickness on wire as according to dividing, and ice thickness reaches more than 20mm and attaches most importance to Ice formation, 10-20mm is middle ice formation, is light ice formation less than 10mm.Surpass UHV transmission line constructive accounting according to China, be less than Under the conditions of 10mm icing, insulation configuration considers according to filth insulation tolerance level.But Field Research result shows, one A little areas have occurred that the covering ice for insulator flashover fault under the conditions of the light icing of wire 5-10mm, such as some shaft tower icing flashover After fault occurs, find that fault area wire icing thickness measurements is only about 5mm, and insulator chain defines more serious Bridge joint.The visible possibility only carrying out external insulation design existence configuration deficiency according to filth insulation tolerance level, and to wire The observation of ice covering thickness and insulator chain icing bridge joint situation also illustrates that wire icing thickness can not with the icing on insulator The most of equal value, it is also possible to cause insulator chain seriously to be bridged by icing under conditions of the light ice covering thickness of wire.But in reality During path monitoring, owing to cannot directly monitor described covering ice for insulator bridge joint degree, the most all by detecting described wire Ice covering thickness judges whether described insulator occurs flashover fault, causes still there is the risk that icing flashover accident occurs.
Summary of the invention
To this end, the technical problem to be solved is to overcome insulator generation icing flashover accident in prior art Problem thus a kind of--icing insulator string icing degree characterizing method that can be prevented effectively from icing flashover accident is provided.
For solving above-mentioned technical problem, a kind of--icing insulator string icing degree characterizing method of the present invention, wherein said Insulator is connected with wire, and its step is as follows: step S1: measure ice covering thickness and the iced insulator of described wire;Step S2: root According to the described iced insulator described covering ice for insulator bridge joint degree relative change rate of conversion;Step S3: combine described in running environment exhausted The type of edge, pollution degree and working voltage, be corrected the relative change rate of described covering ice for insulator bridge joint degree;Step S4: determine described insulator according to the ice covering thickness of the covering ice for insulator bridge joint degree relative change rate after correction and described wire Icing bridge joint degree.
In one embodiment of the invention, described step S2 is described wire and insulator to be carried out under equivalent environment Icing is tested.
In one embodiment of the invention, when carrying out icing experiment, described wire and insulator are seated in artificial gas Wait in room, thick with wire icing by adjusting described covering ice for insulator bridge joint degree under ambient temperature and injection flow rate simulation varying environment The relation of degree.
In one embodiment of the invention, when carrying out icing experiment, covering ice for insulator bridge joint degree under charged condition is compared Relative change rate with not charged under the conditions of the relation of covering ice for insulator bridge joint degree relative change rate.
In one embodiment of the invention, when carrying out icing experiment, the covering ice for insulator at icing initial stage under charged condition Bridge joint degree relative change rate with not charged under the conditions of covering ice for insulator bridge joint degree relative change rate close.
In one embodiment of the invention, when carrying out icing experiment, the covering ice for insulator in icing mid-term under charged condition Bridge joint degree relative change rate with not charged under the conditions of covering ice for insulator bridge joint degree relative change rate have gap, according to insulator surface Described covering ice for insulator bridge joint degree relative change rate is corrected by pollution degree, icing water conductivity, each factor of electric pressure.
In one embodiment of the invention, utilize when described covering ice for insulator bridge joint degree relative change rate being corrected Correction factor can accurately draw covering ice for insulator bridge joint degree relative change rate under charged condition.
In one embodiment of the invention, described correction factor is close, voltage close with salt, grey and icing water conductivity The function that multiple factors are relevant.
In one embodiment of the invention, in described step S2, described covering ice for insulator bridge joint degree relative change rate with Described iced insulator is power function relationship.
In one embodiment of the invention, in described step S4, exhausted by after correcting of described covering ice for insulator bridge joint degree Edge icing bridge joint degree relative change rate determines with the product of described wire icing thickness.
The technique scheme of the present invention has the advantage that compared to existing technology
--icing insulator string icing degree characterizing method of the present invention, utilizes covering ice for insulator bridge joint degree relative change rate to carry out table Levy the relation of insulator bridge joint degree and wire icing thickness, and covering ice for insulator bridge joint degree relative change rate is close about icing The power function of degree, the present invention is by ice covering thickness and the iced insulator of the described wire of measurement thus converses covering of described insulator Ice bridge degree of connecing, the problem that can not directly monitor described covering ice for insulator bridge joint degree when overcoming actual track monitoring, effectively keep away Exempt from the generation of icing flashover accident.
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--icing insulator string icing degree characterizing method of the present invention;
Fig. 2 is the schematic diagram of icing of the present invention experiment.
Detailed description of the invention
Refer to shown in Fig. 1, the present embodiment provides a kind of--icing insulator string icing degree characterizing method, wherein said absolutely Edge is connected with wire, and its step is as follows: step S1: measure ice covering thickness and the iced insulator of described wire;Step S2: according to The described iced insulator described covering ice for insulator bridge joint degree relative change rate of conversion;Step S3: combine and insulate described in running environment Type, pollution degree and the working voltage of son, is corrected the relative change rate of described covering ice for insulator bridge joint degree;Step S4: determine described insulator according to the ice covering thickness of the covering ice for insulator bridge joint degree relative change rate after correction and described wire Icing bridge joint degree.
Above-mentioned is core technology field of the present invention,--icing insulator string icing degree sign side of the present invention Method, wherein said insulator is connected with wire, in described step S1, measures ice covering thickness and the iced insulator of described wire;Institute State in step S2, according to the described iced insulator described covering ice for insulator bridge joint degree relative change rate of conversion, due to same icing ring Under border, described iced insulator is certain, therefore according to the iced insulator under different condition and described covering ice for insulator bridge joint degree phase The relation of rate of change just can be set up functional relationship between the two;In described step S3, insulate in conjunction with described in running environment Type, pollution degree and the working voltage of son, is corrected the relative change rate of described covering ice for insulator bridge joint degree, thus has It is beneficial to the icing degree of--icing insulator string in simulation actual motion environment;In described step S4, according to the insulator after correction Covering ice for insulator in same icing environment can be bridged by the ice covering thickness of icing bridge joint degree relative change rate and described wire Degree converts, so that it is determined that described covering ice for insulator bridge joint degree, the present invention by measure described wire ice covering thickness and Iced insulator thus converse the icing bridge joint degree of described insulator, can not directly monitor described when overcoming actual track monitoring The problem of covering ice for insulator bridge joint degree, effectively characterizes the covering ice for insulator order of severity, has evaded icing flashover accident and sent out Raw risk.
In this enforcement, described step S2 is that described wire and insulator are carried out under equivalent environment icing experiment.Specifically , as in figure 2 it is shown, described wire 11 and insulator 12 are seated in phjytotron 13, wherein said wire 11 with described absolutely Edge 12 is in parallel, and the lower end of described phjytotron 13 is provided with sleeve pipe 14, by conductor and described wire 11 in described sleeve pipe 14 It is connected, in described phjytotron 13, is additionally provided with shower nozzle 15, can be that indoor precipitation is lowered the temperature, by adjusting by described shower nozzle 15 Described covering ice for insulator bridge joint degree and the relation of wire icing thickness under indoor environment temperature and injection flow rate simulation varying environment.
In this enforcement, owing to iced insulator ρ described under identical conditions is certain, close according to icing under different condition for this The relation of degree ρ and described covering ice for insulator bridge joint degree relative change rate K can set up functional relationship between the two.Especially by reality Testing available, described covering ice for insulator bridge joint degree relative change rate K and described iced insulator ρ is power function relationship, uses formula table It is shown as K=C ρn;Wherein C with n is for the constant relevant to insulator type and environmental factors.
Above-mentioned carry out be uncharged icing experiment, for verifying this rule effectiveness under charged condition, also need into The charged ice-coating test of row, and the not charged ice-coating test Comparative result that will carry out under result of the test and the same terms.Specifically, enter During the experiment of row icing, compare under charged condition covering ice for insulator bridge joint degree relative change rate and not charged under the conditions of covering ice for insulator The relation of bridge joint degree relative change rate.Wherein, described covering ice for insulator bridge joint degree relative change rate is divided under charged condition and covering The ice initial stage, icing mid-term, icing three phases stationary stage.Wire described in the icing initial stage and described insulator start to grow ice Insult, experiment shows: described covering ice for insulator bridge joint degree relative change rate with not charged under the conditions of covering ice for insulator bridge joint degree relative Rate of change is close.Icing mid-term, the electric field distortion caused due to sleet growth makes to discharge in high field intensity region, these districts Territory sleet growth is slowed down, and experiment shows: covering ice for insulator bridge joint degree relative change rate described in this stage and not charged icing condition Lower covering ice for insulator bridge joint degree relative change rate has gap, relative change rate now need to according to pollution severity of insulators degree, cover The factors such as frozen water electrical conductivity, electric pressure are corrected.Specifically, according to pollution severity of insulators degree, icing water conductivity, electricity Pressure each factor of grade described covering ice for insulator bridge joint degree relative change rate is corrected, generally utilize correction factor can standard Really draw covering ice for insulator bridge joint degree relative change rate under charged condition, be formulated as: K=C ρnM, wherein said correction system The function that number M is close to salt (ESDD), ash multiple factors such as close (NSDD), voltage U and icing water conductivity σ are relevant, by public affairs Formula is expressed as: M=f(U, σ, NSDD, ESDD ...).For icing stationary stage, due to described wire and the ice slush of described insulator No longer changing, experiment shows: described covering ice for insulator bridge joint degree has reached degree of saturation, and covering ice for insulator bridge joint degree is no longer with institute State the increase of wire icing thickness and increase.
In order to verify the relation to covering ice for insulator bridge joint degree S described under different temperatures Yu described wire icing thickness D, Carry out icing experiment under the conditions of not charged, draw through experiment: described covering ice for insulator bridge joint degree S and described wire icing thickness D linearly relation with increase, and along with the decline of temperature, described wire icing thickness D declines the most therewith, thus correspondence described absolutely Icing bridge joint degree S is the lowest for edge.Drawn by experiment: along with the decline of temperature, described wire and the surface of described insulator simultaneously Iced insulator declines.For described covering ice for insulator bridge joint degree S is carried out quantitatively characterizing with wire icing thickness D relation, if described Covering ice for insulator bridge joint degree relative change rate is K, then be expressed as with formula: K=△ S/ △ D.
For simulated field running environment, need to combine the type of insulator described in running environment, pollution degree and fortune The factors such as row voltage, are corrected the relative change rate of described covering ice for insulator bridge joint degree, thus are more beneficial for making icing exhausted The icing degree of edge substring is closer to actual motion environment.In described step S4, for the covering ice for insulator bridge joint degree S after correction Determined by the product of described covering ice for insulator bridge joint degree relative change rate K and described wire icing thickness D.
To sum up, technical scheme of the present invention has the advantage that
--icing insulator string icing degree characterizing method the most of the present invention, wherein said insulator is connected with wire, described step In rapid S1, measure ice covering thickness and the iced insulator of described wire;In described step S2, according to the conversion of described iced insulator Covering ice for insulator bridge joint degree relative change rate, owing under same icing environment, described iced insulator is certain, therefore according to not The relation of the iced insulator under the conditions of Tong and described covering ice for insulator bridge joint degree relative change rate just can set up letter between the two Number relation;In described step S3, in conjunction with type, pollution degree and the working voltage of insulator described in running environment, to described The relative change rate of covering ice for insulator bridge joint degree is corrected, and is conducive to the covering of--icing insulator string in simulation actual motion environment Ice degree;In described step S4, according to the covering ice for insulator bridge joint degree relative change rate after correction and the icing of described wire Thickness can bridge degree to the covering ice for insulator in same icing environment and convert, so that it is determined that described covering ice for insulator bridge joint Degree, the present invention is by ice covering thickness and the iced insulator of the described wire of measurement thus converses the icing bridge joint of described insulator Degree, the problem that can not directly monitor described covering ice for insulator bridge joint degree when overcoming actual track monitoring, effectively characterize The covering ice for insulator order of severity.
--icing insulator string icing degree characterizing method the most of the present invention, described step S2 is by described wire and insulation Son carries out icing experiment under equivalent environment, by adjusting under artificial climate indoor environment temperature and injection flow rate simulation varying environment Described covering ice for insulator bridge joint degree and the relation of wire icing thickness.
Obviously, above-described embodiment is only for clearly demonstrating example, the not restriction to embodiment.For For those of ordinary skill in the field, the change of other multi-form can also be made on the basis of the above description or become Dynamic.Here without also cannot all of embodiment be given exhaustive.And the obvious change thus extended out or change Move among still in the protection domain of the invention.

Claims (10)

1. a--icing insulator string icing degree characterizing method, wherein said insulator is connected with wire, and its step is as follows:
Step S1: measure ice covering thickness and the iced insulator of described wire;
Step S2: according to the described iced insulator described covering ice for insulator bridge joint degree relative change rate of conversion;
Step S3: combine the type of insulator described in running environment, pollution degree and working voltage, to described covering ice for insulator The relative change rate of bridge joint degree is corrected;
Step S4: determine institute according to the ice covering thickness of the covering ice for insulator bridge joint degree relative change rate after correction and described wire State covering ice for insulator bridge joint degree.
--icing insulator string icing degree characterizing method the most according to claim 1, it is characterised in that: described step S2 is Described wire and insulator are carried out icing experiment under equivalent environment.
--icing insulator string icing degree characterizing method the most according to claim 2, it is characterised in that: carry out icing experiment Time, described wire and insulator are seated in phjytotron, by adjusting ambient temperature and injection flow rate simulation varying environment Under the relation of described covering ice for insulator bridge joint degree and wire icing thickness.
4. according to the--icing insulator string icing degree characterizing method described in Claims 2 or 3, it is characterised in that: carry out icing During experiment, compare under charged condition covering ice for insulator bridge joint degree relative change rate with not charged under the conditions of covering ice for insulator bridge joint degree The relation of relative change rate.
--icing insulator string icing degree characterizing method the most according to claim 4, it is characterised in that: carry out icing experiment Time, under charged condition the covering ice for insulator bridge joint degree relative change rate at icing initial stage with not charged under the conditions of covering ice for insulator bridge joint Relative change rate is close for degree.
--icing insulator string icing degree characterizing method the most according to claim 4, it is characterised in that: carry out icing experiment Time, under charged condition the covering ice for insulator bridge joint degree relative change rate in icing mid-term with not charged under the conditions of covering ice for insulator bridge joint Degree relative change rate have gap, according to pollution severity of insulators degree, icing water conductivity, each factor of electric pressure to described absolutely Edge icing bridge joint degree relative change rate be corrected.
--icing insulator string icing degree characterizing method the most according to claim 6, it is characterised in that: to described insulator Icing bridge joint degree relative change rate utilizes correction factor can accurately draw covering ice for insulator bridge under charged condition when being corrected Degree of connecing relative change rate.
--icing insulator string icing degree characterizing method the most according to claim 7, it is characterised in that: described correction factor For the function that close, voltage close to salt, grey and the multiple factor of icing water conductivity are relevant.
--icing insulator string icing degree characterizing method the most according to claim 1, it is characterised in that: described step S2 In, described covering ice for insulator bridge joint degree relative change rate and described iced insulator are power function relationship.
--icing insulator string icing degree characterizing method the most according to claim 1, it is characterised in that: described step S4 In, described covering ice for insulator bridge joint degree is by the covering ice for insulator bridge joint degree relative change rate after correcting and described wire icing thickness Product determine.
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