CN103941126A - Thermal convection test method and system for composite insulator containing artificial defects - Google Patents
Thermal convection test method and system for composite insulator containing artificial defects Download PDFInfo
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- CN103941126A CN103941126A CN201410168337.3A CN201410168337A CN103941126A CN 103941126 A CN103941126 A CN 103941126A CN 201410168337 A CN201410168337 A CN 201410168337A CN 103941126 A CN103941126 A CN 103941126A
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- 239000012212 insulator Substances 0.000 title claims abstract description 94
- 239000002131 composite material Substances 0.000 title claims abstract description 93
- 230000007547 defect Effects 0.000 title claims abstract description 24
- 238000010998 test method Methods 0.000 title claims abstract description 18
- 239000000523 sample Substances 0.000 claims abstract description 98
- 239000003822 epoxy resin Substances 0.000 claims abstract description 35
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 30
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 14
- 239000004945 silicone rubber Substances 0.000 claims abstract description 13
- 238000009826 distribution Methods 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims abstract description 5
- HPDFFVBPXCTEDN-UHFFFAOYSA-N copper manganese Chemical compound [Mn].[Cu] HPDFFVBPXCTEDN-UHFFFAOYSA-N 0.000 claims description 48
- 238000012360 testing method Methods 0.000 claims description 29
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 238000012546 transfer Methods 0.000 claims description 19
- 239000004020 conductor Substances 0.000 claims description 18
- 238000003860 storage Methods 0.000 claims description 16
- 238000009529 body temperature measurement Methods 0.000 claims description 11
- 238000004804 winding Methods 0.000 claims description 11
- 229920006335 epoxy glue Polymers 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000009933 burial Methods 0.000 claims description 5
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 6
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 210000005056 cell body Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
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- 238000011105 stabilization Methods 0.000 description 1
- 238000005486 sulfidation Methods 0.000 description 1
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention provides a thermal convection test method and a system for a composite insulator containing artificial defects, wherein the test method comprises the following steps: fixedly embedding a temperature measuring probe in the composite insulator, and enabling the temperature measuring probe to be positioned on an interface of the silicone rubber sheath and the epoxy resin core rod; a direct-current constant-voltage source is adopted to supply power to the resistive defects of the composite insulator; in the power supply process, the temperature measuring probe is used for detecting the internal temperature of the composite insulator in real time, the internal defect temperatures under different currents are recorded, and meanwhile, an infrared temperature measuring device is used for shooting and recording the surface temperature distribution condition of the composite insulator; and (4) the recorded data is sorted and analyzed to obtain the relation between the external surface temperature rise and the internal actual temperature rise of the composite insulator. The invention adopts the temperature measuring probe capable of heating and a special fixing method, can realize reliable connection strength, insulation strength and heating power, and finally ensures the accuracy of measurement.
Description
Technical field
The present invention relates to the detection technique field of composite insulator, relate in particular to a kind of thermal convection test method and system of the composite insulator containing artifacts.
Background technology
Composite insulator, because its quality is light, pollution flashover performance is good, and the feature such as cracky, does not replace traditional glass and electric porcelain insulator gradually, is widely applied in electric system.As the key equipment of electrical network, the Stability and dependability of composite insulator operation has directly affected the safety of whole electrical network.Existing operating experience shows, although composite insulator overall operation is all right, still has part composite insulator to occur accident.In order effectively to avoid composite insulator to occur and serious fault, cause huge economic loss, getting up early monitoring means is essential.Infrared temperature-test technology is as the very extensive and easy and simple to handle measure of one application, and the company of being powered is widely used in online detection the in scene of composite insulator.
The heat that the electric discharge phenomena that infrared detection technology may occur by facilities for observation inside are accumulated carrys out the ruuning situation of judgment device, existing research shows, when composite insulator inside, especially high-pressure side, occur when partial discharge phenomenon or when conductive defect, composite insulator will obviously generate heat, and in the time that internal temperature reaches 200 DEG C, silastic material will occur deteriorated, although temperature is only to cause a parameter of inherent vice, electric discharge also can cause inner deteriorated, but the violent intensity of electric discharge still exists and necessarily contacts with internal temperature, therefore we are necessary the actual temperature rise of inside to study.
In the time that local defect appears in composite insulator inside, the material local conductivity of fault location changes, and then the phenomenon such as guiding discharge and the increase of Leakage Current density, thereby may cause hot accumulation.And first heat is propagated the mode by heat conduction in plug and silicon rubber to all directions, in material, set up the temperature field of Gradient Descent, it is mainly determined by the coefficient of heat conductivity of silastic material (silicone rubber) and glass fiber reinforced epoxy resin (FRP)., also there is heat transfer free convection process in the jacket surface of being simultaneously concerned about the most at us, air flows through silastic material surface and the energy exchange processes that causes, is determined by convection transfer rate.Determining of convection transfer rate cannot lean on theoretical method directly to obtain conventionally, and the factor that affects it is very many, mainly comprises flow velocity, the physical property of air, the shape of sheath heating surface, size and relative position etc.The free-convection factor of air is roughly between 1～10 (W × m-2 × K-1).Conventionally adopt test method to determine the convection transfer rate under concrete condition, and with respect to convection heat transfer, the heat that radiation is distributed, far away for little, is therefore ignored.
For better explanation, while there is temperature rise in composite insulator inside, the relation of its outside surface temperature rise (being the result of infrared viewing) and inner actual temperature rise, need to carry out thermal convection test, and the thermal convection test method that needleless generates heat to composite insulator internal point defect now.
Summary of the invention
The thermal convection test method and the system that the object of the present invention is to provide a kind of composite insulator containing artifacts, can draw the outside surface temperature rise of composite insulator and the relation of inner actual temperature rise exactly.
The object of the invention is to be achieved through the following technical solutions.
The thermal convection test method that the present invention proposes a kind of composite insulator containing artifacts, described composite insulator comprises epoxy resin plug and silicone rubber jacket, the method comprises:
One temperature probe is fixedly embedded in to the inside of described composite insulator, and is located on the interface of silicone rubber jacket and epoxy resin plug;
Adopt the resistive defect power supply of DC constant voltage source to composite insulator; In the process of power supply, utilize described temperature probe to detect in real time the internal temperature of composite insulator, record the inherent vice temperature under different electric currents, use infrared temperature measurement apparatus to take situation the record of the surface temperature distribution of composite insulator simultaneously;
Recorded data is carried out to finishing analysis, draw the outside surface temperature rise of described composite insulator and the relation of inner actual temperature rise.
Preferably, said method also comprises: in the time of each measurement, all record temperature and the relative humidity of current environment, and recorded stream is crossed the electric current of composite insulator and reached the stable time.
Preferably, described temperature probe comprises thermopair, insulating tape, manganese-copper filament and two heating wire electric power conductors and a thermopair transfer wire, and its preparation method is:
Apply epoxy glue on the surface of described thermopair, by the anti-insulating tape surface that is bonded at thermopair so that its toughness one side outwardly;
Be individual layer interval on the surface of described insulating tape and be wound around described manganese-copper filament;
The upper and lower side of described manganese-copper filament is welded respectively to described thermopair and the welding of thermopair transfer wire with two heating wire electric power conductors.
Preferably, the spacing d between adjacent two row's manganese-copper filaments is no more than 0.5mm; The coiling length of described manganese-copper filament be greater than thermopair total length 80%; The degree of tilt α of the winding of described manganese-copper filament is less than 30 °.
Preferably, the described method that temperature probe is fixedly embedded in to described composite insulator inside is:
By after the polishing of epoxy resin plug, offer storage tank from its surperficial one end to testing desired location;
Temperature probe is placed in to described storage tank;
To injection ring epoxy resins in described storage tank, utilize this epoxy resin that described temperature probe is fixed;
The epoxy resin plug of fixedly burying underground after temperature probe is put into mould, and injection forms silicone rubber jacket.
Preferably, the described epoxy resin that utilizes by method fixing temperature probe is:
First be coated with a small amount of epoxy resin at the burial place of temperature probe temperature probe is fixed, and make the surface of temperature probe just expose notch;
After treating described a small amount of epoxy resin cure, more a large amount of epoxy resin is injected to storage tank, make it be full of whole storage tank;
Described a large amount of epoxy resin is dried, scrape off the cured epoxy resin that overflows storage tank, and the surface of temperature probe is exposed in air.
Preferably, the burial place of described temperature probe is positioned under the 3rd full skirt of silicone rubber jacket of composite insulator.
Preferably, in the time of injection ring epoxy resins, two heating wire electric power conductors of described temperature probe are distributed in to the both sides of storage tank bottom and make that it does not contact with each other, thermopair transfer wire cloth is in the centre of storage tank bottom.
The thermal convection pilot system that the invention allows for a kind of composite insulator containing artifacts, comprising: temperature probe, constant voltage source, reometer, temperature display watch, infrared temperature measurement apparatus;
Described temperature probe, is fixedly embedded in the inside of composite insulator, detects for the inherent vice temperature to composite insulator;
Described constant voltage source, is connected to described temperature probe, is the resistive defect power supply of composite insulator for adopting DC constant voltage source;
Described reometer, is connected between constant voltage source and temperature probe, for showing in real time current size of current;
Described temperature display watch, is connected to described temperature probe, for showing in real time the inherent vice temperature of the detected composite insulator of temperature probe;
Infrared temperature measurement apparatus, measures in real time for the surface temperature distribution situation to composite insulator.
Preferably, described temperature probe comprises thermopair, insulating tape, manganese-copper filament and two heating wire electric power conductors and a thermopair transfer wire;
Described insulating tape is by the anti-surface that is affixed on thermopair of epoxy glue;
Described manganese-copper filament is individual layer and interval and is wound in the outside surface of insulating tape;
First end, the other end that wherein one end of a heating wire electric power conductor is connected to manganese-copper filament are connected to constant voltage source, and one end of another root heating wire electric power conductor is connected to the second end of manganese-copper filament, the other end is connected to constant voltage source through reometer;
One end of described thermopair transfer wire connects thermopair, the other end is connected to described temperature display watch.
Compared with prior art, beneficial effect is in the present invention:
1) temperature probe that the present embodiment provides, is ensureing on the basis of intensification, temp sensing function, can guarantee that volume reaches minimum.Use little probe first can reduce comparatively really the inner composite insulator that has heating defect on actual track, avoid causing because probe is excessive jacket thickness to cross thin or plug effective diameter minimizing, thereby affect the accuracy of test findings, little probe can also reduce the probability damaging when sheath injection forms simultaneously.
2) provide enough strength of joint, when injection, temperature and air pressure higher (100 atmospheric pressure, more than 150 DEG C), if method of attachment is not good, very easily cause the broken string of inner lead, thereby cause whole sample fails.And the preparation experience of 15 samples shows, use this kind of fixing means, can effectively avoid inner broken string, and through the thermal convection test of 1 month, its switching performance was still good.
3) provide enough dielectric strengths, effectively solved on the basis of guarantee strength of joint, on little probe, connected up, and sample still can ensure enough dielectric strengths under the bad working environments through injection.The preparation of 15 samples shows, uses this kind of fixing means, can effectively avoid inner short circuit, and through the thermal convection test of 1 month, its insulating property were still good.
4) can be for thermal convection test provides enough heating powers, existing now showing with regard to result, there is adstante febre in composite insulator inside, its defect bulk temperature can reach more than 200 DEG C, thereby silastic material is damaged.Therefore,, when thermal convection test, defect temperature should reach 200 degrees Celsius.This fixing means can obtain the high temperature heating defect of 200 DEG C.
5) thermometric is accurate, uses this fixing means, manganese-copper filament by tight winding of single layer on thermopair surface, simultaneously, be wound around area larger, therefore, under final thermal equilibrium state, the temperature error that the temperature of manganese-copper filament and thermopair record is minimum, and in 200 DEG C, its error is less than 0.5 DEG C.This can bring great convenience for further interpretation.
6) operation is simple, with low cost.In the market, there is no the intensification temperature probe for composite insulator thermal convection test, use the probe of this fixing means fabrication and installation, performance parameter meets testing requirements completely, and with low cost, easy and simple to handle, without Special Training.In addition, fixing means and method for embedding do not affect the overall flow that composite insulator injection is produced, and can not affect the production schedule of relevant producer.
7) Test Condition Requirements is low, and the sample that uses this fixing means to prepare, in the time carrying out thermal convection test, only needs 18V direct supply.Defect inner heat temperature can reach 200 DEG C, all can test in most of laboratories.
Brief description of the drawings
Fig. 1 is the structural representation of temperature probe in the embodiment of the present invention.
Fig. 2 is the manufacture method process flow diagram of temperature probe in the embodiment of the present invention.
Fig. 3 is the thermal convection test system architecture figure containing artifacts composite insulator in the embodiment of the present invention.
Fig. 4 is the thermal convection test method process flow diagram containing artifacts composite insulator in the embodiment of the present invention.
Fig. 5 be in the embodiment of the present invention temperature probe at the fixing means process flow diagram of composite insulator inside.
Fig. 6 is the structural representation of burying the plug after temperature probe in the embodiment of the present invention underground.
Embodiment
Core concept of the present invention is: a temperature probe that can heat up is put into the silicone rubber jacket of composite insulator and the interface of epoxy resin plug, simultaneously use outside infrared temperature measurement apparatus to carry out the measurement of temperature, thus the relation of its outside surface temperature rise and inner actual temperature rise when obtaining composite insulator inside and occurring temperature rise.
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to shown in Fig. 1, the temperature probe 1 that can heat up in the present embodiment mainly comprises thermopair 11, insulating tape 12, manganese-copper filament 13 and wire 14.
Wherein, insulating tape 12 is by the anti-surface that is affixed on thermopair 11 of epoxy glue; The tight individual layer of manganese-copper filament 13 and interval are wound on insulating tape 12; Wire 14 has three wires, is respectively two heating wire electric power conductors and a thermopair transfer wire, and two heating wire electric power conductors connect respectively the difference end of manganese-copper filament 13, and thermopair transfer wire connects thermopair 11.
Refer to shown in Fig. 2, the manufacture method of the temperature probe 1 that can heat up in the present embodiment is specially:
201, the thermopair 11 of selecting suitable types, its temperature-measuring range should be greater than 300 DEG C, and size should be as far as possible little, recommends: 30*5*2.5mm.
202, apply epoxy glue on thermopair 11 surfaces, and by anti-insulating tape 12 surface that is bonded at thermopair 11, make its toughness one side outwardly.
203, select manganese-copper filament 13, closely on the insulating tape 12 of winding of single layer on thermopair 11.
On the one hand, because heating power is directly proportional to the coiling length of manganese-copper filament, in order, under less electric current, to provide enough heating powers, therefore the coiling length of manganese-copper filament is answered long enough, the winding that manganese-copper filament should be close as far as possible, and winding degree of tilt should be less.And on the other hand, in order to ensure between mutually insulated, manganese-copper filament should not touch mutually, manganese-copper filament must winding of single layer, this has just limited the maximum possible coiling length of manganese-copper filament.Meanwhile, in order to make the temperature measurement result of probe as far as possible close to the actual temperature of manganese-copper filament, should be large as far as possible by the thermopair area that manganese-copper filament was wound around.Therefore the following method of recommend adoption is wound around in this enforcement, the probe that uses this canoe to obtain, its manganese-copper filament temperature and measured temperature are in 250 DEG C, error is less than ± and 0.5 DEG C: selecting diameter is enamel-cover manganese-copper filament 13 (approximately 120 Ω/m) of 0.07mm, closely on the insulating tape 12 of winding of single layer on thermopair 11, when winding, manganese-copper filament 13 can not be overlapped, and the two spacing d that arrange between manganese-copper filaments 13 should not exceed 0.5mm; In addition, on thermopair 11, the coiling length of manganese-copper filament 13 should be greater than 80% (L1/L2 > 0.8) of thermopair 11 total lengths, and the degree of tilt α of winding should be less than 30 °.
204, use electric soldering iron by upper and lower side joint and the wire bonds of manganese-copper filament 13.
The principle of work of the above-mentioned temperature probe heating up 1: use direct supply to apply voltage to manganese-copper filament 13 two ends, under the effect of ohm effect, manganese-copper filament 13 will generate heat, due to manganese-copper filament 13 be wrapped in thermopair 11 surface and with its close contact, therefore, can use thermopair 11 to read the actual temperature of manganese-copper filament 13, and due to the heating of manganese-copper filament 13, the bulk temperature of temperature probe 1 also will raise, thereby the inherent vice of testing for thermal convection provides thermal source.
Refer to Fig. 3, the thermal convection pilot system that contains the composite insulator 0 of artifacts in the present embodiment comprises: temperature probe 1, constant voltage source 2, reometer 3, temperature display watch 4, the infrared temperature measurement apparatus 5 that can heat up.
Wherein, the temperature probe 1 that can heat up, is fixedly embedded in composite insulator 0 inside, for composite insulator 0 inherent vice temperature is detected.
Constant voltage source 2, its one end is connected to a heating wire electric power conductor of temperature probe 1 through reometer 3, the other end is connected directly to another root heating wire electric power conductor of temperature probe 1, is the resistive defect power supply of composite insulator 0 for adopting DC constant voltage source.
Reometer 3, is connected between a heating wire electric power conductor of constant voltage source 2 and temperature probe 1, in order to the current size of current of real-time demonstration.
Temperature display watch 4, is connected to the thermopair transfer wire of temperature probe 1, in order to the internal temperature of the detected composite insulator 0 of real-time demonstration temperature probe 1.
Infrared temperature measurement apparatus 5, for measuring in real time the temperature of composite insulator 0 outside.
Refer to shown in Fig. 4, in the present embodiment, apply said system and carry out the method for thermal convection test and be:
The temperature probe 1 that 401, can heat up is fixedly embedded in the inner relevant position of composite insulator 0, on the interface of silicone rubber jacket and epoxy resin plug.
402, application constant voltage source 2 adopts the resistive defect power supply of DC constant voltage source to composite insulator 0; In the process of power supply, utilization is positioned at inner temperature probe 1 internal temperature of composite insulator 0 is detected in real time, record the inherent vice temperature under different electric currents, use infrared temperature measurement apparatus 5 to take situation the record of the surface temperature distribution of composite insulator 0 simultaneously.
403, current temperature and the relative humidity of equal recording laboratory in the time of each measurement, and recorded stream is crossed the electric current of composite insulator 0 and is reached the stable time, and should be not less than 90 minutes this stabilization time.
404, recorded data is carried out to finishing analysis, can draw the outside surface temperature rise of the composite insulator 0 that contains artifacts and the relation of inner actual temperature rise.
In above-mentioned test, need to study the relation of heating defect position and outside infrared result, therefore, temperature probe 1 need to accurately be embedded in the inner relevant position of composite insulator 0.But in injection process, cavity atmospheric pressure can reach 100 atmospheric pressure, and in sulfidation subsequently, composite insulator 0 internal temperature can reach 150-160 DEG C.Because air pressure inside is higher, the impact to sample while therefore injection is larger, and for the accuracy of experimental study, should use as far as possible with the similar material of composite insulator material and be fixed, and temperature is higher in the time of injection, common glue can volatilize, and viscosity declines., because probe is less, and be connected with 3 fine rules, connecting portion is comparatively fragile meanwhile, need be in the situation that ensureing to insulate, and the connection that ensures each position is not insulated sub injection process and destroys, and therefore needs temperature probe 1 to adopt special fixing means.
Refer to Fig. 5, in the present embodiment, temperature probe 1 in the fixing method in the inner relevant position of composite insulator 0 is:
501, first by after plug polishing, then at mandrel surface fluting, groove width 6mm, the degree of depth is 5mm, and groove is opened from plug one end to experiment desired location, and determine by different testing requirementss this position, recommends to be embedded under the 3rd full skirt of composite insulator sheath.
502, temperature probe 1 is put into the groove of mandrel surface, first be coated with a small amount of epoxy resin by fixing temperature probe 1 at burial place, and make the surface of temperature probe 1 just expose notch, to ensure that temperature probe 1 is positioned on the interface of plug and sheath after injection moulding.
503, spend 12 hours, after treating epoxy resin cure, a large amount of epoxy resin is inserted, be full of whole cell body.Note, in the time of injection ring epoxy resins, by the both sides of the heating wire electric power conductor distributing slot bottom of temperature probe 1 and make that it does not contact with each other, the centre of thermopair transfer wire cloth bottom cell body as far as possible.
504, use air dryer, on 130 DEG C, dry at least 2 hours.
505, use pocket knife carefully to scrape off and overflow epoxy resin groove, curing, and manganese-copper filament 13 is exposed in air completely.
506, plug is put into mould, inject and form silicone rubber jacket.Now, the structure that is fixed with the plug after temperature probe 1 as shown in Figure 6.
Adopt the advantage of above-mentioned temperature probe and fixing means to be:
1) temperature probe that the present embodiment provides, is ensureing intensification, on the basis of temp sensing function, can guarantee that volume reaches minimum.Use little probe first can reduce comparatively really the inner composite insulator that has heating defect on actual track, avoid causing because probe is excessive jacket thickness to cross thin or plug effective diameter minimizing, thereby affect the accuracy of test findings, little probe can also reduce the probability damaging when sheath injection forms simultaneously.
2) provide enough strength of joint, when injection, temperature and air pressure higher (100 atmospheric pressure, more than 150 DEG C), if method of attachment is not good, very easily cause the broken string of inner lead, thereby cause whole sample fails.And the preparation experience of 15 samples shows, use this kind of fixing means, can effectively avoid inner broken string, and through the thermal convection test of 1 month, its switching performance was still good.
3) provide enough dielectric strengths, this fixing means has effectively solved on the basis of guarantee strength of joint, connect up, and sample still can ensure enough dielectric strengths under the bad working environments through injection on little probe.The preparation of 15 samples shows, uses this kind of fixing means, can effectively avoid inner short circuit, and through the thermal convection test of 1 month, its insulating property were still good.
4) can be for thermal convection test provides enough heating powers, existing now showing with regard to result, there is adstante febre in composite insulator inside, its defect bulk temperature can reach more than 200 DEG C, thereby silastic material is damaged.Therefore,, when thermal convection test, defect temperature should reach 200 degrees Celsius.This fixing means can obtain the high temperature heating defect of 200 DEG C.
5) thermometric is accurate, uses this fixing means, manganese-copper filament by tight winding of single layer on thermopair surface, simultaneously, be wound around area larger, therefore, under final thermal equilibrium state, the temperature error that the temperature of manganese-copper filament and thermopair record is minimum, and in 200 DEG C, its error is less than 0.5 DEG C.This can bring great convenience for further interpretation.
6) operation is simple, with low cost.In the market, there is no the intensification temperature probe for composite insulator thermal convection test, use the probe of this fixing means fabrication and installation, performance parameter meets testing requirements completely, and with low cost, easy and simple to handle, without Special Training.In addition, fixing means and method for embedding do not affect the overall flow that composite insulator injection is produced, and can not affect the production schedule of relevant producer.
7) Test Condition Requirements is low, and the sample that uses this fixing means to prepare, in the time carrying out thermal convection test, only needs 18V direct supply.Defect inner heat temperature can reach 200 DEG C, all can test in most of laboratories.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a thermal convection test method that contains the composite insulator of artifacts, described composite insulator comprises epoxy resin plug and silicone rubber jacket, it is characterized in that, the method comprises:
One temperature probe is fixedly embedded in to the inside of described composite insulator, and is located on the interface of silicone rubber jacket and epoxy resin plug;
Adopt the resistive defect power supply of DC constant voltage source to composite insulator; In the process of power supply, utilize described temperature probe to detect in real time the internal temperature of composite insulator, record the inherent vice temperature under different electric currents, use infrared temperature measurement apparatus to take situation the record of the surface temperature distribution of composite insulator simultaneously;
Recorded data is carried out to finishing analysis, draw the outside surface temperature rise of described composite insulator and the relation of inner actual temperature rise.
2. the thermal convection test method of the composite insulator containing artifacts as claimed in claim 1, it is characterized in that, the method also comprises: in the time of each measurement, all record temperature and the relative humidity of current environment, and recorded stream is crossed the electric current of composite insulator and reached the stable time.
3. the thermal convection test method of the composite insulator containing artifacts as claimed in claim 1, it is characterized in that, described temperature probe comprises thermopair, insulating tape, manganese-copper filament and two heating wire electric power conductors and a thermopair transfer wire, and its preparation method is:
Apply epoxy glue on the surface of described thermopair, by the anti-insulating tape surface that is bonded at thermopair so that its toughness one side outwardly;
Be individual layer interval on the surface of described insulating tape and be wound around described manganese-copper filament;
The upper and lower side of described manganese-copper filament is welded respectively to described thermopair and the welding of thermopair transfer wire with two heating wire electric power conductors.
4. the thermal convection test method of the composite insulator containing artifacts as claimed in claim 3, is characterized in that, the spacing d between adjacent two row's manganese-copper filaments is no more than 0.5mm; The coiling length of described manganese-copper filament be greater than thermopair total length 80%; The degree of tilt α of the winding of described manganese-copper filament is less than 30 °.
5. the thermal convection test method of the composite insulator containing artifacts as described in as arbitrary in claim 1 to 4, is characterized in that, the described method that temperature probe is fixedly embedded in to described composite insulator inside is:
By after the polishing of epoxy resin plug, offer storage tank from its surperficial one end to testing desired location;
Temperature probe is placed in to described storage tank;
To injection ring epoxy resins in described storage tank, utilize this epoxy resin that described temperature probe is fixed;
The epoxy resin plug of fixedly burying underground after temperature probe is put into mould, and injection forms silicone rubber jacket.
6. the thermal convection test method of the composite insulator containing artifacts as claimed in claim 5, is characterized in that, the described epoxy resin that utilizes by method fixing temperature probe is:
First be coated with a small amount of epoxy resin at the burial place of temperature probe temperature probe is fixed, and make the surface of temperature probe just expose notch;
After treating described a small amount of epoxy resin cure, more a large amount of epoxy resin is injected to storage tank, make it be full of whole storage tank;
Described a large amount of epoxy resin is dried, scrape off the cured epoxy resin that overflows storage tank, and the surface of temperature probe is exposed in air.
7. the thermal convection test method of the composite insulator containing artifacts as claimed in claim 5, is characterized in that, the burial place of described temperature probe is positioned under the 3rd full skirt of silicone rubber jacket of composite insulator.
8. the thermal convection test method of the composite insulator containing artifacts as claimed in claim 5, it is characterized in that, in the time of injection ring epoxy resins, two heating wire electric power conductors of described temperature probe are distributed in to the both sides of storage tank bottom and make that it does not contact with each other, thermopair transfer wire cloth is in the centre of storage tank bottom.
9. a thermal convection pilot system that contains the composite insulator of artifacts, is characterized in that, this system comprises: temperature probe, constant voltage source, reometer, temperature display watch, infrared temperature measurement apparatus;
Described temperature probe, is fixedly embedded in the inside of composite insulator, detects for the inherent vice temperature to composite insulator;
Described constant voltage source, is connected to described temperature probe, is the resistive defect power supply of composite insulator for adopting DC constant voltage source;
Described reometer, is connected between constant voltage source and temperature probe, for showing in real time current size of current;
Described temperature display watch, is connected to described temperature probe, for showing in real time the inherent vice temperature of the detected composite insulator of temperature probe;
Infrared temperature measurement apparatus, measures in real time for the surface temperature distribution situation to composite insulator.
10. the thermal convection pilot system of the composite insulator containing artifacts as claimed in claim 9, is characterized in that, described temperature probe comprises thermopair, insulating tape, manganese-copper filament and two heating wire electric power conductors and a thermopair transfer wire;
Described insulating tape is by the anti-surface that is affixed on thermopair of epoxy glue;
Described manganese-copper filament is individual layer and interval and is wound in the outside surface of insulating tape;
First end, the other end that wherein one end of a heating wire electric power conductor is connected to manganese-copper filament are connected to constant voltage source, and one end of another root heating wire electric power conductor is connected to the second end of manganese-copper filament, the other end is connected to constant voltage source through reometer;
One end of described thermopair transfer wire connects thermopair, the other end is connected to described temperature display watch.
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