CN106782941A - A kind of method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System - Google Patents
A kind of method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System Download PDFInfo
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- CN106782941A CN106782941A CN201611198910.0A CN201611198910A CN106782941A CN 106782941 A CN106782941 A CN 106782941A CN 201611198910 A CN201611198910 A CN 201611198910A CN 106782941 A CN106782941 A CN 106782941A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/50—Insulators or insulating bodies characterised by their form with surfaces specially treated for preserving insulating properties, e.g. for protection against moisture, dirt, or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
- H01B19/04—Treating the surfaces, e.g. applying coatings
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- Organic Insulating Materials (AREA)
Abstract
The present invention relates to a kind of method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System, the method is in confined reaction room, in at suitable temperature and pressure condition, fluorination treatment is carried out to epoxy insulation using the gaseous mixture or fluorine gas and the gaseous mixture of indifferent gas of fluorine gas and nitrogen, the fluorinated layer of the keys of F containing C is formed on epoxy insulation surface, is used to improve the resistance to discharge performance of epoxy insulation.Compared with prior art, the inventive method processing step is simple, and controllability is good, and financial cost is low, and can in batches, equably be modified the epoxy insulator with arbitrary shape and size, be particularly suitable for commercial applications.
Description
Technical field
The invention belongs to high voltage gas insulation technology field, epoxy is exhausted in being related to one kind for improving Electrode in Gas Insulated System
The method of the resistance to discharge performance of edge.
Background technology
Polymer insulator has been subjected to the improvement and development of decades, today in raw material, formula and manufacturing process
Accepted extensively by market.Especially epoxy insulation is not only widely used in both outdoors and indoors High-Voltage Insulation, Er Qiexian
Modern closed gas insulation system, such as the institute used in gas-insulated switchgear (GIS) and gas insulated power pipeline (GIL)
There is insulator to be benzvalene form or column epoxy insulation.This is attributed to polymer insulation has than traditional ceramics and glass insulation
Many advantages, such as insulating properties that have had and adaptability, simple manufacturing process, it is lightweight and easily transport and installation,
Not cracky.Due to prominent electrical insulating property, arc extinguishing ability and chemical stability, nontoxicity, SF6It is these high voltage gases
The most frequently used gas-insulated medium in insulation system and high voltage gas-blast circuit breaker.On the other hand, with SF6High greenhouse effects
Compare, N2It is typical, cheap environment-friendly gas, and people are had now found that in SF6In be mixed into the N of proper proportion2, will not
Interfere significantly on the insulating properties of Electrode in Gas Insulated System.However, compared with ceramics and glass insulation, polymer insulation uses process
In, because the factors such as electric discharge are easy to aging, degraded, the especially generation of edge flashing or arc accident, it is easier to cause polymerization
Seriously degraded or the carbonization of thing insulating surface, loses its insulating properties, and has to be changed.This can not only bring directly
Economic loss, and because power-off may then cause great indirect economic loss.Therefore, resistance to electric discharge ablation ability is polymerization
One of most important performance of thing insulation.
The content of the invention
The purpose of the present invention is exactly to provide a kind of process is simple for the defect for overcoming above-mentioned prior art to exist, and is only changed
Become the physical chemical characteristicses on epoxy insulation top layer without changing other any body characteristicses and characteristic, can significantly be carried under fluorination conditions wide
The method of the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System high.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System, the method is in confined reaction
In room, at suitable temperature and pressure condition, fluorine gas and the gaseous mixture or fluorine gas and the gaseous mixture pair of indifferent gas of nitrogen are used
Epoxy insulation carries out fluorination treatment, and the top layer (fluorinated layer) containing C-F keys is formed on epoxy insulation surface, is used to improve epoxy exhausted
The resistance to discharge performance of edge.
The temperature of described confined reaction room is -120 DEG C of room temperature, and pressure is 0.1-2bar.
Used as preferred technical scheme, the temperature of described confined reaction room is 50-80 DEG C, and pressure is 0.3-1bar.
The volumn concentration that described fluorine gas accounts for reactive mixed gas is 2-50%.
Used as preferred technical scheme, the volumn concentration that described fluorine gas accounts for reactive gaseous mixture is 10-20%.
Described reactive mixed gas are preferably fluorine gas and nitrogen mixture.
Insulating gas in described Electrode in Gas Insulated System includes SF6Or N2In one or two.
The time of described fluorination treatment is 10min-24h.
Used as preferred technical scheme, the time of described fluorination treatment is 30min-2h.
In the present invention, fluorination treatment is carried out to epoxy insulation using the reactive mixed gas containing fluorine gas, it is exhausted in epoxy
The thickness that edge surface forms the top layer (fluorinated layer) containing C-F keys is 0.3-2 μm.
Mentality of designing of the invention is in closed reative cell, at certain temperature and reaction pressure, using containing one
Determine the reactive gaseous mixture of fluorine gas volumetric concentration, fluorination treatment epoxy insulation regular hour.Due to the top layer quilt of epoxy insulation
Fluorination, so as to form with certain thickness fluorinated layer (containing the top layer of C-F keys), epoxy modified by this invention is exhausted
Edge, in SF6Gas, N2Gas or SF6/N2Resistance to discharge capability (or resistance to electric discharge ablation number of times) in gaseous mixture has been respectively increased 1.5~
2.5 times, 9.0~14.0 times or 3.0~14.5 times (depend on fluorination conditions and SF6And N2The mixed proportion of gas).
Compared with prior art, the invention has the characteristics that：
1) present invention only changes epoxy exhausted using a kind of process is simple, technology maturation, extremely effective gas-phase modification method
The physical chemical characteristicses on edge top layer, do not change its any body characteristics and characteristic, and different from " physics coating ", the top layer of the fluorination with not
The interior interlayer of fluorination is the entirety of one " organic (chemistry) is combined "；
2) the inventive method is used, epoxy insulation during Electrode in Gas Insulated System can be significantly increased under fluorination conditions wide
Resistance to discharge capability, applied widely, practicality is good；
3) processing step is simple, and controllability is good, and financial cost is low, can in batches, equably be modified with arbitrary shape and chi
Very little epoxy insulator, is particularly suitable for commercial applications.
Brief description of the drawings
Fig. 1 is the epoxy insulation gas phase fluorination processing system schematic diagram of the inventive method；
Fig. 2 be through the inventive method (embodiment 1) before modified after epoxy insulation decay ATR-FTIR compose；
Fig. 3 is the section electron microscopic mirror image through the modified epoxy insulation of the inventive method (embodiment 1)；
Fig. 4 be through the inventive method (embodiment 1) before modified after epoxy insulation surface electronic microscopic iage；
Fig. 5 is the finger electrodes and sample schematic diagram used by resistance to discharge test in following embodiments；
Fig. 6 be through the inventive method (embodiment 3) before modified after 7 epoxy insulations in SF6Flashover voltage is exchanged in gas
With the change of flashover number of times；
Fig. 7 be through the inventive method (embodiment 3) before modified after epoxy insulation surface with SF6Flashover number of times is exchanged in gas
Typical change.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Referring initially to Fig. 1.The process is simple of the inventive method, it is only necessary to epoxy insulation is placed in fluorination room, in " invention
Gas phase fluorination treatment is carried out to it under illustrated fluorination conditions wide in content ".
Refer to Fig. 2~Fig. 4.The resistance to discharge capability of insulating materials depends on its chemical composition and structure.The inventive method
Substitution and the addition to double bond in top layer by fluorine atom to hydrogen atom and other groups in epoxy insulation top layer, in epoxy
Insulation top layer in form the singly-bound (C-F keys) of " most strong " in organic chemistry, while change epoxy insulation top layer chemistry and
Physical arrangement, the purpose of its resistance to discharge performance is improved so as to reach.In the present invention, the reactive gaseous mixture containing fluorine gas is used
Body carries out fluorination treatment to epoxy insulation, and the thickness for foring the top layer (fluorinated layer) containing C-F keys on epoxy insulation surface is
0.3-2μm。
Described in embodiment in detailed following article, and shown by the typical consequence (embodiment 3) of Fig. 6 and Fig. 7, with without
The modified epoxy insulation in the inventive method top layer is compared, using the modified epoxy insulation of the inventive method, in SF6Gas, N2Gas or
SF6/N2The resistance to discharge capability number of times of ablation (can be resistant to electric discharge) in gaseous mixture be respectively increased 1.5~2.5 times, 9.0~14.0
Times or 3.0~14.5 times (depend on fluorination conditions and SF6And N2The mixed proportion of gas).Therefore, the inventive method is to extension gas
The service life effect is significant of epoxy insulation in insulation system, with obvious actual application value.
Hereinafter each implementation of the cited method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System
Example, as shown in figure 5, using identical stainless steel finger electrodes and the thick epoxy insulation sheet specimens of 2.5mm.Epoxy insulation piece
The fluorination treatment of shape sample is in confined reaction room, at suitable temperature and pressure condition, to use delivery of fluorine/nitrogen gaseous mixture
Carry out.When resistance to discharge capability experiment is carried out, SF in stainless steel close test storehouse6Gas, N2The pressure of the gaseous mixture of gas or both is equal
It is 1bar.N2The flashover test of gas is in the way of direct current, linear boosting, and SF6Gas or SF6/N2Flashover test in gaseous mixture,
By the way of exchange, linear boosting.
Embodiment 1
The fluorination treatment condition of epoxy insulation：The temperature of confined reaction room is 55 DEG C, and pressure is 1bar.Fluorine gas accounts for reactivity
The volumn concentration of mixed gas is 12.5%, and the time of fluorination treatment is 30min.
Resistance to electric discharge ablation situation：Concrete outcome is as shown in table 1, through the fluorinated modified epoxy insulation in the top layer, in N2In gas
Average resistance to electric discharge ablation ability (number of times) improve 11.3 times with unfluorinated epoxy insulation compared with, and mean direct flashover is electric
Pressure improves 14.1%, in SF6Average resistance to electric discharge ablation ability (number of times) in gas is improved compared with unfluorinated epoxy insulation
2.0 times, and averagely exchange flashover voltage and do not change significantly.
Embodiment 2
The fluorination treatment condition of epoxy insulation：The temperature of confined reaction room is 25 DEG C, and pressure is 0.1bar.Fluorine gas accounts for reaction
Property mixed gas volumn concentration be 50%, time of fluorination treatment is 4h.
Resistance to electric discharge ablation situation：Concrete outcome is as shown in table 1, through the fluorinated modified epoxy insulation in the top layer, in N2In gas
Average resistance to electric discharge ablation ability (number of times) improve 10.8 times with unfluorinated epoxy insulation compared with, and mean direct flashover is electric
Pressure improves 5.0%, in SF6Average resistance to electric discharge ablation ability (number of times) in gas improves compared with unfluorinated epoxy insulation
1.5 times, and averagely exchange flashover voltage and do not change significantly.
Embodiment 3
The fluorination treatment condition of epoxy insulation：The temperature of confined reaction room is 85 DEG C, and pressure is 1bar.Fluorine gas accounts for reactivity
The volumn concentration of mixed gas is 12.5%, and the time of fluorination treatment is 30min.
Resistance to electric discharge ablation situation：Concrete outcome is as shown in table 1, through the fluorinated modified epoxy insulation in the top layer, in N2In gas
Average resistance to electric discharge ablation ability (number of times) improve 12.0 times with unfluorinated epoxy insulation compared with, and mean direct flashover is electric
Pressure improves 19.8%, in SF6Average resistance to electric discharge ablation ability (number of times) in gas is improved compared with unfluorinated epoxy insulation
2.2 times, and averagely exchange flashover voltage and do not change significantly.
Embodiment 4
The fluorination treatment condition of epoxy insulation：The temperature of confined reaction room is 25 DEG C, and pressure is 0.5bar.Fluorine gas accounts for reaction
Property mixed gas volumn concentration be 25%, time of fluorination treatment is 2h.
Resistance to electric discharge ablation situation：Concrete outcome is as shown in table 1, through the fluorinated modified epoxy insulation in the top layer, in N2In gas
Average resistance to electric discharge ablation ability (number of times) improve 11.5 times with unfluorinated epoxy insulation compared with, and mean direct flashover is electric
Pressure improves 5.9%, in SF6Average resistance to electric discharge ablation ability (number of times) in gas improves compared with unfluorinated epoxy insulation
1.6 times, and averagely exchange flashover voltage and do not change significantly.
Embodiment 5
The fluorination treatment condition of epoxy insulation：The temperature of confined reaction room is 120 DEG C, and pressure is 2bar.Fluorine gas accounts for reaction
Property mixed gas volumn concentration be 2%, time of fluorination treatment is 10min.
Resistance to electric discharge ablation situation：Concrete outcome is as shown in table 1, through the fluorinated modified epoxy insulation in the top layer, in N2In gas
Average resistance to electric discharge ablation ability (number of times) improve 10.0 times with unfluorinated epoxy insulation compared with, and mean direct flashover is electric
Pressure improves 13.0%, in SF6Average resistance to electric discharge ablation ability (number of times) in gas is improved compared with unfluorinated epoxy insulation
1.5 times, and averagely exchange flashover voltage and do not change significantly.
Embodiment 6
The fluorination treatment condition of epoxy insulation：The temperature of confined reaction room is 100 DEG C, and pressure is 1.5bar.Fluorine gas is accounted for instead
The volumn concentration of answering property mixed gas is 5%, and the time of fluorination treatment is 15min.
Resistance to electric discharge ablation situation：Concrete outcome is as shown in table 1, through the fluorinated modified epoxy insulation in the top layer, in N2In gas
Average resistance to electric discharge ablation ability (number of times) improve 11.0 times with unfluorinated epoxy insulation compared with, and mean direct flashover is electric
Pressure improves 12.3%, in SF6Average resistance to electric discharge ablation ability (number of times) in gas is improved compared with unfluorinated epoxy insulation
1.6 times, and averagely exchange flashover voltage and do not change significantly.
Embodiment 7
The fluorination treatment condition of epoxy insulation：The temperature of confined reaction room is 15 DEG C, and pressure is 1bar.Fluorine gas accounts for reactivity
The volumn concentration of mixed gas is 15%, and the time of fluorination treatment is 24h.
Resistance to electric discharge ablation situation：Concrete outcome is as shown in table 1, through the fluorinated modified epoxy insulation in the top layer, in N2In gas
Average resistance to electric discharge ablation ability (number of times) improve 13.5 times with unfluorinated epoxy insulation compared with, and mean direct flashover is electric
Pressure improves 6.7%, in SF6Average resistance to electric discharge ablation ability (number of times) in gas improves compared with unfluorinated epoxy insulation
2.5 times, and averagely exchange flashover voltage and do not change significantly.
The unfluorinated epoxy insulation of table 1 and embodiment 1-7 fluorinated epoxy insulation, in N2Gas and SF6Average resistance to electric discharge in gas
Ablation number of times and average flashover severity voltage
Embodiment 8
The fluorination treatment condition of epoxy insulation：The temperature of confined reaction room is 95 DEG C, and pressure is 1.5bar.Fluorine gas accounts for reaction
Property mixed gas volumn concentration be 8%, time of fluorination treatment is 20min.
In SF6/N2Volume ratio is 1:4、1:1 or 4:Resistance to electric discharge ablation situation in 1 mix insulation gas：Concrete outcome is such as
Shown in table 2, average resistance to electric discharge ablation ability (number of times) through the fluorinated modified epoxy insulation in the top layer is exhausted with unfluorinated epoxy
Edge is compared and has been respectively increased 11.4,6.8 or 3.8 times, and is averagely exchanged flashover voltage and do not changed significantly.
Embodiment 9
The fluorination treatment condition of epoxy insulation：The temperature of confined reaction room is 65 DEG C, and pressure is 0.2bar.Fluorine gas accounts for reaction
Property mixed gas volumn concentration be 35%, time of fluorination treatment is 2h.
In SF6/N2Volume ratio is 1:4、1:1 or 4:Resistance to electric discharge ablation situation in 1 mix insulation gas：Concrete outcome is such as
Shown in table 2, average resistance to electric discharge ablation ability (number of times) through the fluorinated modified epoxy insulation in the top layer is exhausted with unfluorinated epoxy
Edge is compared and has been respectively increased 10.8,6.1 or 3.2 times, and is averagely exchanged flashover voltage and do not changed significantly.
Embodiment 10
The fluorination treatment condition of epoxy insulation：The temperature of confined reaction room is 120 DEG C, and pressure is 0.1bar.Fluorine gas is accounted for instead
The volumn concentration of answering property mixed gas is 50%, and the time of fluorination treatment is 12h.
In SF6/N2Volume ratio is 1:4、1:1 or 4:Resistance to electric discharge ablation situation in 1 mix insulation gas：Concrete outcome is such as
Shown in table 2, average resistance to electric discharge ablation ability (number of times) through the fluorinated modified epoxy insulation in the top layer is exhausted with unfluorinated epoxy
Edge is compared and has been respectively increased 10.1,5.9 or 3.2 times, and is averagely exchanged flashover voltage and do not changed significantly.
Embodiment 11
The fluorination treatment condition of epoxy insulation：The temperature of confined reaction room is 15 DEG C, and pressure is 2bar.Fluorine gas accounts for reactivity
The volumn concentration of mixed gas is 2%, and the time of fluorination treatment is 24h.
In SF6/N2Volume ratio is 1:4、1:1 or 4:Resistance to electric discharge ablation situation in 1 mix insulation gas：Concrete outcome is such as
Shown in table 2, average resistance to electric discharge ablation ability (number of times) through the fluorinated modified epoxy insulation in the top layer is exhausted with unfluorinated epoxy
Edge is compared and has been respectively increased 13.7,8.1 or 4.5 times, and is averagely exchanged flashover voltage and do not changed significantly.
The unfluorinated epoxy insulation of table 2 and embodiment 8-11 fluorinated epoxy insulation, in SF6/N2It is average in mix insulation gas
Resistance to electric discharge ablation number of times and average flashover severity voltage
The above-mentioned description to embodiment is to be understood that and use invention for ease of those skilled in the art.
Person skilled in the art obviously can easily make various modifications to these embodiments, and described herein general
Principle is applied in other embodiment without by performing creative labour.Therefore, the invention is not restricted to above-described embodiment, ability
Field technique personnel announcement of the invention, does not depart from improvement that scope made and modification all should be of the invention
Within protection domain.
Claims (9)
1. a kind of method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System, it is characterised in that the method is
In confined reaction room, at suitable temperature and pressure condition, fluorine gas and the gaseous mixture or fluorine gas and indifferent gas of nitrogen are used
Gaseous mixture fluorination treatment is carried out to epoxy insulation, epoxy insulation surface formed the fluorinated layer containing C-F keys, be used to improve ring
The resistance to discharge performance of oxygen insulation.
2. a kind of method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System according to claim 1,
Characterized in that, the temperature of described confined reaction room is -120 DEG C of room temperature, pressure is 0.1-2bar.
3. a kind of method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System according to claim 2,
Characterized in that, the temperature of described confined reaction room is 50-80 DEG C, pressure is 0.3-1bar.
4. a kind of method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System according to claim 1,
Characterized in that, the volumn concentration that described fluorine gas accounts for reactive mixed gas is 2-50%.
5. a kind of method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System according to claim 4,
Characterized in that, the volumn concentration that described fluorine gas accounts for reactive mixed gas is 10-20%.
6. a kind of method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System according to claim 5,
Characterized in that, described reactive mixed gas are preferably the gaseous mixture of fluorine gas and nitrogen.
7. a kind of method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System according to claim 1,
Characterized in that, the time of described fluorination treatment is 10min-24h.
8. a kind of method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System according to claim 7,
Characterized in that, the time of described fluorination treatment is 30min-2h.
9. a kind of method for improving the resistance to discharge performance of epoxy insulation in Electrode in Gas Insulated System according to claim 1,
Characterized in that, the insulating gas in described Electrode in Gas Insulated System includes SF6Or N2In one or two.
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