CN105974285A - Method and system for determining external insulation performance of contamination insulator under condensation condition - Google Patents
Method and system for determining external insulation performance of contamination insulator under condensation condition Download PDFInfo
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- CN105974285A CN105974285A CN201610487808.6A CN201610487808A CN105974285A CN 105974285 A CN105974285 A CN 105974285A CN 201610487808 A CN201610487808 A CN 201610487808A CN 105974285 A CN105974285 A CN 105974285A
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- insulator
- criterion
- flashover
- polluted
- fog chamber
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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
Abstract
The invention relates to a method for determining the external insulation performance of a contamination insulator under a condensation condition, and the method comprises the steps: carrying out the preprocessing of an insulator; placing the preprocessed contamination insulator in a low-temperature and low-moisture environment, so as to carry out the precooling of the contamination insulator; starting a steam generator to fill a fog room with steam, and measuring whether the steam in the fog room is saturate or not; stopping the steam generator to cut off the supply of steam to the fog room when the steam in the fog room is saturate, placing the fog room under a closed condition, and enabling the fog room to be cooled naturally, so as to enable the interior of the fog room to form a normal-temperature and high-moisture environment; placing the precooled contamination insulator in the closed fog room, and enabling the surface of the contamination insulator to be wetted uniformly, so as to form a water film; carrying out the flashover testing of the contamination insulator with the water film on the surface, thereby determining a flashover voltage under the condensation condition.
Description
Technical field
The present invention relates to analogue measurement field, and be used for determining condensation bar more particularly, to one
The method and system of the external insulation performance of Criterion of Polluted Insulator under part.
Background technology
Relatively big generally, due to the temperature difference sooner or later of the hinterland on such as Xinjiang and other places, therefore wet at air
After degree reaches certain value, bigger day and night temperature makes the steam in air produce in insulating surface condensation
Raw aqueous water.In this case, condensing condition can make insulator surface uniformly make moist, and easily
Flashover is there is with the insulator of pollution layer after causing making moist.Flashover can cause Criterion of Polluted Insulator to lose insulation
Ability.In this case, flashover normally results in than more serious accident.
For this reason, it may be necessary to carry out the pollution test of Criterion of Polluted Insulator, determine the flashover voltage of Criterion of Polluted Insulator,
Test basis is provided for realizing safe and reliable external insulation design.And polluted external insulation under the conditions of uniformly making moist
The flashover voltage of son is minimum, can simulate worst environmental condition.
Existing a kind of method for Criterion of Polluted Insulator external insulation performance test is hot mist method.Hot mist method
By using boiler heating to produce barber, and barber is passed through in fog chamber makes whole fog chamber reach
Saturated, thus the surface of Criterion of Polluted Insulator in moistening fog chamber.But, the shortcoming of hot mist method is as follows: (1)
Hot mist method makes the saturated moistening principle of polluted external insulation sub-surface except Criterion of Polluted Insulator surface temperature is less than heat
Outside the condensation that the temperature of mist is caused, the most undersized water droplet collides with polluted external insulation sub-surface
And it is attached to surface.Therefore, hot mist method can not simulate merely condensing condition.And (2) hot mist method makes
Fog chamber's temperature is higher than room temperature, it is impossible to model engineering actual operating state well.
In addition to hot mist method, existing Criterion of Polluted Insulator external insulation method for testing performance there is a method in which
For cold mist method.Cold mist method is to make water be atomized at normal temperatures by methods such as ultrasound wave.But, cold
The shortcoming of mist method is as follows: the mist temperature that (1) produces due to cold mist method and room temperature maintain an equal level, and in fog chamber
There is no temperature difference between Criterion of Polluted Insulator, therefore moisten Criterion of Polluted Insulator completely by undersized water droplet with
Polluted external insulation sub-surface collides and is attached to surface, it is impossible to simulation condensation.And (2) only water
Dripping causes cold mist method to make moist uneven with surface collision, it is impossible to obtain minimum flashover voltage.
Summary of the invention
In order in the experiment desk research condensation impact on pollution flashover voltage, need the one can
The method of the external insulation performance test of Criterion of Polluted Insulator under simulation condensing condition in the lab.Condensation is
Refer to that steam is met condensation and formed the physical process of water.In order to simulate in actual environment in test chamber
Dew condensation phenomenon, need to realize following some:
(1) the relatively low and actual environment that humidity is higher of temperature in early morning can be simulated.
(2) the sufficiently large temperature difference can be generated.
(3) can all produce condensation on the surface of Criterion of Polluted Insulator, make water with moisture film rather than water droplet
Form occurs.
(4) condensing state of Criterion of Polluted Insulator can remain to after flashover test completes.
For above-mentioned requirements, it is desirable to provide stain under a kind of simulation condensing condition used in the lab
The test method of insulator external insulation performance.
According to an aspect of the present invention, it is provided that a kind of for determining Criterion of Polluted Insulator under condensing condition
The method of external insulation performance, described method includes:
Insulator is carried out pretreatment；
Criterion of Polluted Insulator through pretreatment is placed in the environment of low temperature and low humidity with to polluted external insulation
Son carries out precooling treatment；
Start barber generator in fog chamber, be passed through barber, and the barber measured in fog chamber is
No reach saturation；
When the barber in fog chamber reaches saturation, described barber generator stops in fog chamber
It is passed through barber, and natural cooling in described fog chamber being placed in airtight condition and making fog chamber, so that
Room temperature and the environment of high humidity is formed in obtaining fog chamber；
Criterion of Polluted Insulator through precooling treatment is placed in airtight fog chamber so that Criterion of Polluted Insulator
Surface uniformly makes moist to form moisture film；And
The Criterion of Polluted Insulator to surface with moisture film carries out flashover test, so that it is determined that under condensing condition
Flashover voltage.
Preferably, described Criterion of Polluted Insulator carried out pretreatment include: Criterion of Polluted Insulator is carried out,
Make filth according to the salt density pre-set and gray density, utilize quantitative brushing method by described filthy painting
Brush polluted external insulation sub-surface, and the Criterion of Polluted Insulator having brushed filth is dried in the shade.
Preferably, described saturation be barber be full of in described fog chamber and described fog chamber relative
Humidity is more than 90%.
Preferably, the described Criterion of Polluted Insulator to surface with moisture film carries out flashover test, so that it is determined that
Flashover voltage under condensing condition includes: apply voltage at Criterion of Polluted Insulator two ends, and by described electricity
Pressure starts uniformly to raise from 0 volt until Criterion of Polluted Insulator generation flashover, magnitude of voltage when will there is flashover
As the flashover voltage under condensing condition.
Further, described Criterion of Polluted Insulator is carried out at least three flashover tests, and by described extremely
The minima at least two magnitude of voltage when there is flashover in few three flashover tests is as condensing condition
Under flashover voltage.
According to a further aspect in the invention, it is provided that a kind of for determining Criterion of Polluted Insulator under condensing condition
The system of external insulation performance, described system includes:
Pretreatment unit, carries out pretreatment to insulator；
Precooling treatment unit, is placed on the environment of low temperature and low humidity by the Criterion of Polluted Insulator through pretreatment
In so that Criterion of Polluted Insulator is carried out precooling treatment；
Barber generator, is passed through barber in fog chamber, and whether measures the barber in fog chamber
Reach saturation；When the barber in fog chamber reaches saturation, described barber generator stops
Only in fog chamber, it is passed through barber, and described fog chamber is placed in airtight condition and makes mist Indoor Natural
Cooling, so that forming room temperature and the environment of high humidity in fog chamber；
Condensing unit, is placed into the Criterion of Polluted Insulator through precooling treatment in airtight fog chamber so that
Polluted external insulation sub-surface uniformly makes moist to form moisture film；And
Power supply unit, the Criterion of Polluted Insulator to surface with moisture film carries out flashover test, so that it is determined that cold
Flashover voltage under the conditions of Ning.
Preferably, described pretreatment unit carries out pretreatment to Criterion of Polluted Insulator and includes: described pretreatment
Criterion of Polluted Insulator is carried out by unit, makes filth according to the salt density pre-set and gray density,
Utilize quantitative brushing method that described filth is brushed to polluted external insulation sub-surface, and filth will have been brushed
Criterion of Polluted Insulator dries in the shade.
Preferably, described saturation be barber be full of in described fog chamber and described fog chamber relative
Humidity is more than 90%.
Preferably, said supply unit has the Criterion of Polluted Insulator of moisture film and carries out flashover test surface,
So that it is determined that the flashover voltage under condensing condition includes: said supply unit is executed at Criterion of Polluted Insulator two ends
Making alive, and start uniformly to raise until Criterion of Polluted Insulator generation flashover from 0 volt by described voltage,
Magnitude of voltage during flashover will be occurred as the flashover voltage under condensing condition.
Further, described system carries out at least three flashover tests to described Criterion of Polluted Insulator, and
Using in described at least three flashover tests occur flashover time at least two magnitude of voltage in minima as
Flashover voltage under condensing condition.
Accompanying drawing explanation
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by:
Fig. 1 is the side of the external insulation performance for determining Criterion of Polluted Insulator according to embodiment of the present invention
The flow chart of method；
Fig. 2 is the external insulation performance for determining Criterion of Polluted Insulator according to another embodiment of the present invention
The flow chart of method；And
Fig. 3 be the external insulation performance for determining Criterion of Polluted Insulator according to embodiment of the present invention be
The structural representation of system.
Detailed description of the invention
With reference now to accompanying drawing, introduce the illustrative embodiments of the present invention, but, the present invention can be with being permitted
The most different forms is implemented, and is not limited to embodiment described herein, it is provided that these embodiments
It is in order at large and fully disclose the present invention and saturated to person of ordinary skill in the field
Pass on the scope of the present invention.For representing that the term in illustrative embodiments in the accompanying drawings is not
Limitation of the invention.In the accompanying drawings, identical cells/elements uses identical reference.
Except as otherwise noted, term used herein (including scientific and technical terminology) is to art
Technical staff has and common understands implication.Further it will be understood that with normally used dictionary
The term limited, it should be understood to that the linguistic context in field associated therewith has consistent implication, and should not
This is understood to Utopian or the most formal meaning.
Fig. 1 is the side of the external insulation performance for determining Criterion of Polluted Insulator according to embodiment of the present invention
The flow chart of method 100.Generally, in order to preferably simulation actual environment residing for Criterion of Polluted Insulator,
It is thus possible to more accurately determine the external insulation performance of Criterion of Polluted Insulator, it is desirable to be able to simulation temperature in early morning
Spend relatively low and that humidity is higher actual environment.To this end, simulated environment allows for generating sufficiently large temperature
Difference, using the basis as condensation.In this case, high humility and the big temperature difference can stained absolutely
The surface of edge all produces condensation, makes water occur with moisture film rather than form of moisture drops.Further, at mould
In near-ring border, the condensing state of Criterion of Polluted Insulator needs to remain to after flashover test completes.
For above-mentioned requirements, according to the external insulation performance of the determination Criterion of Polluted Insulator of embodiment of the present invention
Method 100 barber generator can be utilized to form saturated hot mist environment in confined space, and
And natural cooling in subsequently described fog chamber being placed in airtight condition and making fog chamber, so that shape in fog chamber
Become room temperature and the environment of high humidity.On the other hand, the Criterion of Polluted Insulator through pretreatment is entered by method 100
Row precooling treatment, and the Criterion of Polluted Insulator through precooling treatment is placed in airtight fog chamber, make
Obtain polluted external insulation sub-surface uniformly to make moist to form moisture film.Finally, method 100 has moisture film to surface
Criterion of Polluted Insulator carry out flashover test, so that it is determined that the flashover voltage under condensing condition.
According to the embodiment of the present invention, for the method determining the external insulation performance of Criterion of Polluted Insulator
100 start in step 101 place.Preferably, in step 101, insulator is carried out pretreatment.Preferably
Ground, described carry out pretreatment to insulator and includes, is first carried out insulator.Generally, to absolutely
Edge is carried out being to create more preferable initial condition.Then, in order to obtain more preferable proving ring
Border, makes filthy according to the salt density pre-set and gray density and utilizes quantitative brushing method by described
Filth is brushed to insulator surface.Finally, in order to obtain the external environment condition preferably simulating reality, will
The insulator having brushed filth dries in the shade.The salt density wherein pre-set and gray density can be to appoint
What rational numerical value, and can be determined or measure according to reality the number of Criterion of Polluted Insulator by experimenter
Obtain according to carrying out statistics.
Preferably, in step 102, the Criterion of Polluted Insulator through pretreatment is placed on low temperature and low humidity
Environment in so that Criterion of Polluted Insulator is carried out precooling treatment.Generally, in order to simulate in actual external environment condition
Condensing condition, it is necessary to simulation actual environment in polluted external insulation subenvironment.Such as, the newest
The hinterland on the ground such as the boundary temperature difference sooner or later is relatively big, therefore after air humidity reaches certain value, temperature
Rapid drawdown makes the steam in air produce aqueous water in insulating surface condensation.For this reason, it may be necessary to will pass through
The Criterion of Polluted Insulator of pretreatment carries out pre-cooling cooling process.Preferably, it will usually by through pretreatment
Criterion of Polluted Insulator is placed in the environment of low temperature and low humidity, thus realizes Criterion of Polluted Insulator is carried out pre-cooling
Process.
Preferably, in step 103, start barber generator in fog chamber, be passed through barber, and
Whether the barber measured in fog chamber reaches saturation.Wherein, barber generator can generate steaming
Steam fog, using as the basis simulating true fog environment.Preferably, fog chamber is airtight space, and
And wherein can accommodate the Criterion of Polluted Insulator etc. carrying out testing.Carry out in fog chamber generally, due to test,
Therefore the ambient condition in fog chamber just seems extremely important.Preferably, barber generator is started to mist
Room is passed through barber, and it needs to be determined that in fog chamber barber whether reach requirement.Generally, steaming
While steam fog generator is passed through barber in fog chamber, the steam bath in fog chamber can be measured in real time whether
Reach saturation.Preferably, described saturation is that barber is full of described fog chamber and described mist
Indoor relative humidity is more than 90%.One of ordinary skill in the art it will be appreciated that the present invention only
The relative humidity being full of in described fog chamber and described fog chamber by barber is to say as a example by more than 90%
Bright, it is relative that saturation can also is that barber is full of in 90% and described fog chamber of described fog chamber
Humidity is 95% etc..
Preferably, in step 104, when the barber in fog chamber reaches saturation, described steam
Fog generator stops being passed through barber in fog chamber, and described fog chamber is placed in airtight condition and makes
Natural cooling in fog chamber, so that forming room temperature and the environment of high humidity in fog chamber.Similarly, for mould
Intend the condensing condition in actual external environment condition, it is necessary to the polluted external insulation subenvironment in simulation actual environment.
When the barber in fog chamber reaches saturation, need the environment making to realize room temperature and high humidity in fog chamber.
To this end, barber generator would generally be made to stop being passed through barber in fog chamber.Subsequently, by described mist
Room be placed in airtight condition and make fog chamber in natural cooling so that the environment in fog chamber can gradually shape
Become room temperature and the environment of high humidity.
Preferably, in step 105, the Criterion of Polluted Insulator through precooling treatment is placed into airtight mist
In room so that polluted external insulation sub-surface uniformly makes moist to form moisture film.Generally, in order to staining
The surface of insulator all produces condensation, makes water occur with moisture film rather than form of moisture drops, then necessary
Meet two conditions.One of them condition is exactly, Criterion of Polluted Insulator through pretreatment and precooling treatment with
Criterion of Polluted Insulator in simulating actual conditions, and another condition is satisfactory airtight fog chamber, example
As, there is the airtight fog chamber of the environment of room temperature and high humidity.When the above two conditions are met, it is only possible to
Polluted external insulation sub-surface is made uniformly to make moist to form moisture film.
Preferably, in step 106 place, the Criterion of Polluted Insulator to surface with moisture film carries out flashover test,
So that it is determined that the flashover voltage under condensing condition.Generally, in order to determine Criterion of Polluted Insulator under condensing condition
External insulation performance, crucial step is that Criterion of Polluted Insulator is applied voltage to carry out flashover test.Its
In, the Criterion of Polluted Insulator to surface with moisture film carries out flashover test, so that it is determined that under condensing condition
Flashover voltage includes: apply voltage at Criterion of Polluted Insulator two ends, and by described voltage from the beginning of 0 volt
Uniformly raise until Criterion of Polluted Insulator generation flashover, magnitude of voltage during flashover will be occurred as condensing condition
Under flashover voltage.Additionally, in order to determine flashover voltage the most accurately, generally to continue many
Secondary test.Generally, described Criterion of Polluted Insulator is carried out at least three flashover tests, and by described extremely
The minima at least two magnitude of voltage when there is flashover in few three flashover tests is as condensing condition
Under flashover voltage.That is, repeat the above steps 101-106 at least three times, the most all obtained sudden strain of a muscle
Network voltage.Normally, using the minima in flashover voltage as flashover voltage.In order to guarantee number
According to effectively, generally to test under the same conditions, will test in above-mentioned steps 101-105
Condition keeps consistent.
Fig. 2 is the external insulation performance for determining Criterion of Polluted Insulator according to another embodiment of the present invention
The flow chart of method 200.Generally, in order to preferably simulate the reality residing for Criterion of Polluted Insulator
Environment such that it is able to more accurately determine the external insulation performance of Criterion of Polluted Insulator, it is desirable to be able to simulation
Early morning relatively low the and actual environment that humidity is higher of temperature.To this end, simulated environment allows for generating enough
The big temperature difference, using the basis as condensation.In this case, high humility and the big temperature difference can be
The surface of Criterion of Polluted Insulator all produces condensation, makes water occur with moisture film rather than form of moisture drops.Further,
In simulated environment, the condensing state of Criterion of Polluted Insulator needs to remain to after flashover test completes.
For above-mentioned requirements, according to the external insulation of the determination Criterion of Polluted Insulator of another embodiment of the present invention
The method 200 of performance can utilize barber generator to form saturated hot mist ring in confined space
Border, and natural cooling in described fog chamber being placed in airtight condition and making fog chamber, so that shape in fog chamber
Become room temperature and the environment of high humidity.On the other hand, the Criterion of Polluted Insulator through pretreatment is entered by method 200
Row precooling treatment, and the Criterion of Polluted Insulator through precooling treatment is placed in airtight fog chamber, make
Obtain polluted external insulation sub-surface uniformly to make moist to form moisture film.Finally, method 200 has moisture film to surface
Criterion of Polluted Insulator carry out flashover test, so that it is determined that the flashover voltage under condensing condition.Preferably,
Method 200 uses parallel form to carry out.Such as, as in figure 2 it is shown, step 202-203 and step
Rapid 205-206 is parallel.
According to the embodiment of the present invention, for the method determining the external insulation performance of Criterion of Polluted Insulator
200 start in step 201 place.From the beginning of step 201 place, parallel part starts.On the one hand,
In step 202, insulator is carried out pretreatment.Preferably, described insulator is carried out pretreatment bag
Include, first insulator is carried out.Generally, being carried out insulator is to create preferably
Initial condition.Then, in order to obtain more preferable experimental enviroment, according to the salt density pre-set and ash
Density makes filthy and utilizes quantitative brushing method that described filth is brushed to insulator surface.Finally,
In order to obtain the external environment condition preferably simulating reality, the Criterion of Polluted Insulator having brushed filth is carried out the moon
Dry.The salt density wherein pre-set and gray density can be any rational numerical value, and can be by
Experimenter determines or measures the data of Criterion of Polluted Insulator according to reality and carries out statistics and obtain.
Preferably, in step 203, the Criterion of Polluted Insulator through pretreatment is placed on low temperature and low humidity
Environment in so that Criterion of Polluted Insulator is carried out precooling treatment.Generally, in order to simulate in actual external environment condition
Condensing condition, it is necessary to simulation actual environment in polluted external insulation subenvironment.Such as, the newest
The hinterland on the ground such as the boundary temperature difference sooner or later is relatively big, therefore after air humidity reaches certain value, temperature
Rapid drawdown makes the steam in air produce aqueous water in insulating surface condensation.For this reason, it may be necessary to will pass through
The Criterion of Polluted Insulator of pretreatment carries out pre-cooling cooling process.Preferably, it will usually by through pretreatment
Criterion of Polluted Insulator is placed in the environment of low temperature and low humidity, thus realizes Criterion of Polluted Insulator is carried out pre-cooling
Process.
Preferably, on the other hand, step 205, start barber generator in fog chamber, be passed through steaming
Steam fog, and measure whether the barber in fog chamber reaches saturation.Wherein, barber generator
Barber can be generated, using as the basis simulating true fog environment.Preferably, fog chamber is airtight
Space, and wherein can accommodate the Criterion of Polluted Insulator etc. carrying out testing.Exist generally, due to test
Carrying out in fog chamber, therefore the ambient condition in fog chamber just seems extremely important.Preferably, steam is started
Fog generator is passed through barber in fog chamber, and it needs to be determined that in fog chamber barber whether reach requirement.
Generally, while barber generator is passed through barber in fog chamber, can measure in fog chamber in real time
Whether steam bath reaches saturation.Preferably, described saturation is that barber is full of described fog chamber
And the relative humidity in described fog chamber is more than 90%.One of ordinary skill in the art it will be appreciated that
The relative humidity that the present invention is only full of in described fog chamber and described fog chamber with barber is more than 90% to be
Example illustrates, and saturation can also is that barber is full of 90% and described fog chamber of described fog chamber
In relative humidity be 95% etc..
Then, in step 206, when the barber in fog chamber reaches saturation, described barber
Generator stops being passed through barber in fog chamber, and described fog chamber is placed in airtight condition and makes mist
Indoor Natural cools down, so that forming room temperature and the environment of high humidity in fog chamber.Similarly, in order to simulate
Condensing condition in actual external environment condition, it is necessary to the polluted external insulation subenvironment in simulation actual environment.
When the barber in fog chamber reaches saturation, need the environment making to realize room temperature and high humidity in fog chamber.
To this end, barber generator would generally be made to stop being passed through barber in fog chamber.Subsequently, by described mist
Room be placed in airtight condition and make fog chamber in natural cooling so that the environment in fog chamber can gradually shape
Become room temperature and the environment of high humidity.
Preferably, the above is the external insulation of the determination Criterion of Polluted Insulator according to another embodiment of the present invention
The parallel section of the method 200 of performance.
It follows that in step 204, the Criterion of Polluted Insulator through precooling treatment is placed into airtight mist
In room, and in step 207, polluted external insulation sub-surface uniformly makes moist to form moisture film.Generally, for
Can all produce condensation on the surface of Criterion of Polluted Insulator, make the water go out with moisture film rather than form of moisture drops
Existing, then must to be fulfilled for two conditions.One of them condition is exactly that Criterion of Polluted Insulator is through pretreatment
With precooling treatment with the Criterion of Polluted Insulator in simulating actual conditions, and another condition is satisfactory
Airtight fog chamber, such as, has the airtight fog chamber of the environment of room temperature and high humidity.When meeting above-mentioned two bar
During part, it is only possible to so that polluted external insulation sub-surface uniformly makes moist to form moisture film.
Preferably, in step 208 place, the Criterion of Polluted Insulator to surface with moisture film carries out flashover test,
So that it is determined that the flashover voltage under condensing condition.Generally, in order to determine Criterion of Polluted Insulator under condensing condition
External insulation performance, crucial step is that Criterion of Polluted Insulator is applied voltage to carry out flashover test.Its
In, the Criterion of Polluted Insulator to surface with moisture film carries out flashover test, so that it is determined that under condensing condition
Flashover voltage includes: apply voltage at Criterion of Polluted Insulator two ends, and by described voltage from the beginning of 0 volt
Uniformly raise until Criterion of Polluted Insulator generation flashover, magnitude of voltage during flashover will be occurred as condensing condition
Under flashover voltage.Additionally, in order to determine flashover voltage the most accurately, generally to continue many
Secondary test.Generally, described Criterion of Polluted Insulator is carried out at least three flashover tests, and by described extremely
The minima at least two magnitude of voltage when there is flashover in few three flashover tests is as condensing condition
Under flashover voltage.That is, repeat the above steps 202-208 at least three times, the most all obtained sudden strain of a muscle
Network voltage.Normally, using the minima in flashover voltage as flashover voltage.In order to guarantee number
According to effectively, generally to test under the same conditions, will test in above-mentioned steps 202-207
Condition keeps consistent.
Fig. 3 be the external insulation performance for determining Criterion of Polluted Insulator according to embodiment of the present invention be
The structural representation of system 300.Generally, in order to preferably simulate the reality residing for Criterion of Polluted Insulator
Environment such that it is able to more accurately determine the external insulation performance of Criterion of Polluted Insulator, it is desirable to be able to simulation
Early morning relatively low the and actual environment that humidity is higher of temperature.To this end, simulated environment allows for generating enough
The big temperature difference, using the basis as condensation.In this case, high humility and the big temperature difference can be
The surface of Criterion of Polluted Insulator all produces condensation, makes water occur with moisture film rather than form of moisture drops.Further,
In simulated environment, the condensing state of Criterion of Polluted Insulator needs to remain to after flashover test completes.
For above-mentioned requirements, according to the external insulation for determining Criterion of Polluted Insulator of embodiment of the present invention
The system 300 of performance can utilize barber generator to form saturated hot mist ring in confined space
Border, and natural cooling in subsequently described fog chamber being placed in airtight condition and making fog chamber, so that mist
Indoor formation room temperature and the environment of high humidity.On the other hand, system 300 is by staining absolutely through pretreatment
Edge carries out precooling treatment, and the Criterion of Polluted Insulator through precooling treatment is placed into airtight fog chamber
In so that polluted external insulation sub-surface uniformly makes moist to form moisture film.Finally, surface is had by system 300
The Criterion of Polluted Insulator having moisture film carries out flashover test, so that it is determined that the flashover voltage under condensing condition.
According to the embodiment of the present invention, system 300 includes: pretreatment unit 301, precooling treatment
Unit 302, barber generator 303, condensing unit 304 and power supply unit 305.Preferably,
Pretreatment unit 301 carries out pretreatment to insulator.Preferably, described insulator is carried out pretreatment
Including, first insulator is carried out.Generally, being carried out insulator is to create more preferably
Initial condition.Then, in order to obtain more preferable experimental enviroment, according to the salt density pre-set and
Gray density makes filthy and utilizes quantitative brushing method that described filth is brushed to insulator surface.Finally,
In order to obtain the external environment condition preferably simulating reality, the insulator having brushed filth is dried in the shade.
The salt density wherein pre-set and gray density can be any rational numerical value, and can be by testing
Personnel determine or measure the data of insulator according to reality and carry out statistics and obtain.
Preferably, precooling treatment unit 302 Criterion of Polluted Insulator through pretreatment is placed on low temperature and
So that Criterion of Polluted Insulator is carried out precooling treatment in the environment of low humidity.Generally, in order to simulate actual external rings
Condensing condition in border, it is necessary to the polluted external insulation subenvironment in simulation actual environment.Such as, all
The hinterland temperature difference sooner or later such as Xinjiang and other places is relatively big, therefore after air humidity reaches certain value, and temperature
The rapid drawdown of degree makes the steam in air produce aqueous water in insulating surface condensation.For this reason, it may be necessary to will
Criterion of Polluted Insulator through pretreatment carries out pre-cooling cooling process.Preferably, it will usually will be through pre-place
The Criterion of Polluted Insulator of reason is placed in the environment of low temperature and low humidity, thus realizes carrying out Criterion of Polluted Insulator
Precooling treatment.
Preferably, barber generator 303 is passed through barber in fog chamber, and measures in fog chamber
Whether barber reaches saturation.Wherein, barber generator can generate barber, using as
Simulate the basis of true fog environment.Preferably, fog chamber is airtight space, and wherein can hold
Receive the Criterion of Polluted Insulator etc. carrying out testing.Carry out in fog chamber, therefore in fog chamber generally, due to test
Ambient condition just seem extremely important.Preferably, start barber generator in fog chamber, be passed through steaming
Steam fog, and it needs to be determined that in fog chamber barber whether reach requirement.Generally, at barber generator
While being passed through barber in fog chamber, whether the steam bath that can measure in fog chamber in real time reaches saturated shape
State.Preferably, described saturation be barber be full of in described fog chamber and described fog chamber relative
Humidity is more than 90%.One of ordinary skill in the art are it will be appreciated that the present invention only fills with barber
Relative humidity in full described fog chamber and described fog chamber is to illustrate as a example by more than 90%, saturated shape
State can also is that the relative humidity that barber is full of in 90% and described fog chamber of described fog chamber is 95%
Deng.
Preferably, when the barber in fog chamber reaches saturation, barber generator 303 stops
In fog chamber, it is passed through barber, and described fog chamber is placed in airtight condition and makes mist Indoor Natural cold
But, so that forming room temperature and the environment of high humidity in fog chamber.Similarly, in order to simulate actual external rings
Condensing condition in border, it is necessary to the polluted external insulation subenvironment in simulation actual environment.When in fog chamber
When barber reaches saturation, need the environment making to realize room temperature and high humidity in fog chamber.To this end, it is logical
Barber generator often can be made to stop being passed through barber in fog chamber.Subsequently, described fog chamber is placed in close
Natural cooling in closing condition and making fog chamber so that the environment in fog chamber can gradually form room temperature and
The environment of high humidity.
Preferably, the Criterion of Polluted Insulator through precooling treatment is placed into airtight mist by condensing unit 304
In room so that polluted external insulation sub-surface uniformly makes moist to form moisture film.Generally, in order to staining
The surface of insulator all produces condensation, makes water occur with moisture film rather than form of moisture drops, then necessary
Meet two conditions.One of them condition is exactly, Criterion of Polluted Insulator through pretreatment and precooling treatment with
Criterion of Polluted Insulator in simulating actual conditions, and another condition is satisfactory airtight fog chamber, example
As, there is the airtight fog chamber of the environment of room temperature and high humidity.When the above two conditions are met, it is only possible to
Polluted external insulation sub-surface is made uniformly to make moist to form moisture film.
Preferably, power supply unit 305 has the Criterion of Polluted Insulator of moisture film and carries out flashover test surface,
So that it is determined that the flashover voltage under condensing condition.Generally, in order to determine Criterion of Polluted Insulator under condensing condition
External insulation performance, crucial step is that Criterion of Polluted Insulator is applied voltage to carry out flashover test.Its
In, the Criterion of Polluted Insulator to surface with moisture film carries out flashover test, so that it is determined that under condensing condition
Flashover voltage includes: apply voltage at Criterion of Polluted Insulator two ends, and by described voltage from the beginning of 0 volt
Uniformly raise until Criterion of Polluted Insulator generation flashover, magnitude of voltage during flashover will be occurred as condensing condition
Under flashover voltage.Additionally, in order to determine flashover voltage the most accurately, generally to continue many
Secondary test.Generally, described Criterion of Polluted Insulator is carried out at least three flashover tests, and by described extremely
The minima at least two magnitude of voltage when there is flashover in few three flashover tests is as condensing condition
Under flashover voltage.
By describing the present invention with reference to a small amount of embodiment.But, those skilled in the art institute
Known, as subsidiary Patent right requirement is limited, except the present invention disclosed above other
Embodiment fall within the scope of the present invention equally.
Normally, all terms used in the claims are all according to their usual in technical field
Implication is explained, unless additionally defined clearly wherein.All of reference " one/described/should [dress
Put, assembly etc.] " be construed at least one example in described device, assembly etc. with being all opened, remove
Non-additionally clearly state.The step of any method disclosed herein all need not with disclosed accurately
Order is run, unless explicitly stated otherwise.
Claims (10)
1. for the method determining the external insulation performance of Criterion of Polluted Insulator under condensing condition, described side
Method includes:
Insulator is carried out pretreatment；
Criterion of Polluted Insulator through pretreatment is placed in the environment of low temperature and low humidity with to polluted external insulation
Son carries out precooling treatment；
Start barber generator in fog chamber, be passed through barber, and the barber measured in fog chamber is
No reach saturation；
When the barber in fog chamber reaches saturation, described barber generator stops in fog chamber
It is passed through barber, and natural cooling in described fog chamber being placed in airtight condition and making fog chamber, so that
Room temperature and the environment of high humidity is formed in fog chamber；
Criterion of Polluted Insulator through precooling treatment is placed in airtight fog chamber so that Criterion of Polluted Insulator
Surface uniformly makes moist to form moisture film；And
The Criterion of Polluted Insulator to surface with moisture film carries out flashover test, so that it is determined that under condensing condition
Flashover voltage.
Method the most according to claim 1, described carry out pretreatment to insulator and includes: to absolutely
Edge is carried out, and makes filth according to the salt density pre-set and gray density, utilizes quantitatively brushing
Described filth is brushed to insulator surface by method, and is dried in the shade by the insulator having brushed filth.
Method the most according to claim 1, described saturation is that barber is full of described fog chamber
And the relative humidity in described fog chamber is more than 90%.
Method the most according to claim 1, the described Criterion of Polluted Insulator to surface with moisture film enters
Row flashover test, so that it is determined that the flashover voltage under condensing condition includes: execute at Criterion of Polluted Insulator two ends
Making alive, and start uniformly to raise until Criterion of Polluted Insulator generation flashover from 0 volt by described voltage,
Magnitude of voltage during flashover will be occurred as the flashover voltage under condensing condition.
Method the most according to claim 4, further, carries out at least three to described insulator
Secondary flashover test, and by described at least three flashover tests occur flashover time at least two voltage
Minima in value is as the flashover voltage under condensing condition.
6. for determining a system for the external insulation performance of insulator under condensing condition, described system bag
Include:
Pretreatment unit, carries out pretreatment to insulator；
Precooling treatment unit, is placed on the environment of low temperature and low humidity by the Criterion of Polluted Insulator through pretreatment
In so that Criterion of Polluted Insulator is carried out precooling treatment；
Barber generator, is passed through barber in fog chamber, and whether measures the barber in fog chamber
Reach saturation；When the barber in fog chamber reaches saturation, described barber generator stops
Only in fog chamber, it is passed through barber, and described fog chamber is placed in airtight condition and makes mist Indoor Natural cold
But, so that forming room temperature and the environment of high humidity in fog chamber；
Condensing unit, is placed into the Criterion of Polluted Insulator through precooling treatment in airtight fog chamber so that
Polluted external insulation sub-surface uniformly makes moist to form moisture film；And
Power supply unit, the Criterion of Polluted Insulator to surface with moisture film carries out flashover test, so that it is determined that cold
Flashover voltage under the conditions of Ning.
System the most according to claim 6, Criterion of Polluted Insulator is carried out pre-by described pretreatment unit
Process includes: Criterion of Polluted Insulator is carried out by described pretreatment unit, close according to the salt pre-set
Degree and gray density make filth, utilize quantitative brushing method that described filth is brushed to polluted external insulation sub-surface,
And the Criterion of Polluted Insulator having brushed filth is dried in the shade.
System the most according to claim 6, described saturation is that barber is full of described fog chamber
And the relative humidity in described fog chamber is more than 90%.
System the most according to claim 6, said supply unit has moisture film to surface and stains
Insulator carries out flashover test, so that it is determined that the flashover voltage under condensing condition includes: described power supply is single
Unit Criterion of Polluted Insulator two ends apply voltage, and start uniformly to raise from 0 volt by described voltage until
Criterion of Polluted Insulator generation flashover, will occur magnitude of voltage during flashover as the flashover voltage under condensing condition.
System the most according to claim 9, further, described system is stained absolutely described
Edge carries out at least three flashover tests, and by when described at least three flashover tests occur flashover
At least two magnitude of voltage in minima as the flashover voltage under condensing condition.
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| CN201610487808.6A CN105974285A (en) | 2016-06-28 | 2016-06-28 | Method and system for determining external insulation performance of contamination insulator under condensation condition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108957265A (en) * | 2018-08-27 | 2018-12-07 | 云南电网有限责任公司电力科学研究院 | High condensation area insulator VFTO flashover property rate of descent experimental rig and method |
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| CN204479703U (en) * | 2015-03-30 | 2015-07-15 | 国家电网公司 | The device of a kind of simulated high-pressure climate cell natural fog |
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| CN102645618A (en) * | 2012-04-16 | 2012-08-22 | 浙江清科电力科技有限公司 | Intelligent detection method and detection system device for contaminated insulator |
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| CN108957265B (en) * | 2018-08-27 | 2024-04-09 | 云南电网有限责任公司电力科学研究院 | Device and method for testing VFTO flashover characteristic decline rate of porcelain bushing in high condensation area |
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Application publication date: 20160928 |