CN101585943A - Cable semi-conductive shielding material and preparation method thereof - Google Patents
Cable semi-conductive shielding material and preparation method thereof Download PDFInfo
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- CN101585943A CN101585943A CNA2009100533132A CN200910053313A CN101585943A CN 101585943 A CN101585943 A CN 101585943A CN A2009100533132 A CNA2009100533132 A CN A2009100533132A CN 200910053313 A CN200910053313 A CN 200910053313A CN 101585943 A CN101585943 A CN 101585943A
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Abstract
The invention provides a cable semi-conductive shielding material which belongs to the field of electric cable fabrication technique and a preparation method thereof, and the components of the material and the content thereof are as follows: ethylene-vinyl acetate copolymer or linear low density polyethylene 100 proportion by weight, black carbon 10-50 proportion by weight, anti-oxidant 0.1-5 proportion by weight as well as cross linker 0.1-5 proportion by weight. The method provided by the invention can effectively inhibit accumulation of space charges in insulation material, and improves electric field threshold value of injected space charge, which reduces insulation material electric conductivity increased effect induced by space charge-limited current (SCLC), and the electric field distortion rate in XLPE is only 14-19% under -60kV/mm extra electric field for 60 minutes.
Description
Technical field
What the present invention relates to is the shielding material in a kind of cable technology field and preparation method thereof, specifically is a kind of cable semi-conductive shielding material and preparation method thereof.
Background technology
High voltage dc transmission technology because have that withstand voltage height, transmission capacity are big, transmission of electricity density height, loss is little, the life-span is long and fed distance be not subjected to capacitive current characteristics such as restriction, in electrical power trans mission/distribution system, more and more adopted.Adopt plastics can make cable have the favorable mechanical performance, and running maintenance is convenient as the insulating material of cable, acid-and base-resisting, advantage such as anticorrosive, so the direct current plastic cable will replace the more direct current paper oil insulation cable of present use gradually.Under higher DC electric field, the space-charge effect in the plastic material with and the variation of specific conductivity be its principal element of restriction as high-voltage DC cable insulating material.In power cable, for prevent to insulate and conductor between and shelf depreciation takes place in the space between insulation and the external shielding layer, adopt semi-conductive shielding material at each interlayer, simultaneously because it can reduce the potential gradient of stranded conductor surface and metal screen layer inside, thereby make the electric field distribution on the cable insulation even, reduce the electric stress in the insulation layer, and can keep the insulation surfaces externally and internally closely to contact, thereby prevent stranded conductor and Surface Insulation generation corona discharge; It can also prevent to cause that because of conductor is overheated insulating damages when short circuit.The interface that semi-conductive shielding material and cable insulation form is one of the principal element that influences the electric property of cable insulation.Adopt different materials as semi-conductive shielding material, because its work function difference, can influence electric charge from the injection of electrode to insulating material, thus influence in the insulating material space-charge effect with and specific conductivity.There were a lot of scholars to be devoted to the research of high voltage direct current cable semi-conductive shielding material in recent years abroad, Japanese scholar arranged, suppressed the effect that the space electric charge gathers in the insulating material thereby reach by in semiconductive material, adding zeolite; Also there is Japanese scholar to realize the inhibition that space electric charge in the insulating material is gathered by the method that adopts the multiwalled semiconductive material.
Find through retrieval prior art, the article An Investigation of theInfluence of Semiconductive Electrode Materials in the ac breakdown andthe Charge accumulation in XLPE that people such as E.J.Kim and D.H.Park delivers on 1998 AnnualReport.Conference on Flectrical Insulation and Dielectric Phenomena (electric insulation and dielectric medium annual report meeting 1998) (research of the influence that the semiconduction electrode materials gathers alternating current breakdown and the space charge of XLPE) points out, when the content by control crosslinking method of semiconductive material and linking agent can influence it as electrode, the amount that insulating material volume inside electric charge gathers.The article Electrodes andCharge Injection in Low-density Polyethylene (space charge in electrode and the new LDPE (film grade) injects) that people such as G.Chen and T.Y.G.Tay is published in IEEE Transaction on Dielectrics andElectrical Insulation (IEEE electric insulation and dielectric medium journal) calendar year 2001 points out, adopt gold electrode (gold-plated), can suppress the injection in new LDPE (film grade) of electronics and hole effectively to semiconductive material.By giving semiconductive material gold-plated, though can well reduce the space charge in the insulating material, economy is relatively poor, and considers difficult the realization from the cable manufacturing process aspect.
Further in the retrieval, find that people such as D.Fabiani and G.C.Montanari were published among the article Polymeric HVDC Cable Design and Space ChargeAccumulation.Part 1:Insulation/Semicon Interface (design of polymkeric substance high voltage direct current cable is gathered first part with space charge: insulation and semiconductive interface) of IEEETransaction on Dielectrics and Electrical Insulation (IEEE electric insulation and dielectric medium journal) in 2007 and point out that semi-conductive shielding material is bigger to the variable effect of electric charge injection threshold value and specific conductivity in the insulating material, adopt the lower semiconductive material of activation energy can improve the threshold value that space charge injects effectively in insulating material, and the space charge limited current (SCLC) in the restriction insulating material.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of cable semi-conductive shielding material and preparation method thereof is provided, by adopting different organic materialss as base mateiral, and the carbon black of the different performance index of mixing, reach the space charge that suppresses in the cable insulation material and gather and reduce its specific conductivity, prepare the purpose of the stronger semi-conductive shielding material that can be used for the high voltage direct current plastic cable of a kind of economy.
The present invention is achieved by the following technical solutions:
The component and the content thereof that the present invention relates to cable semi-conductive shielding material are: ethene-vinyl acetate copolymer (EVA) or linear low density polyethylene (LLDPE) 100 weight parts, carbon black 10-50 weight part, oxidation inhibitor 0.1-5 weight part and linking agent 0.1-5 weight part.
The melting index of described ethene-vinyl acetate copolymer is 150-400g/10min, and density is less than 0.96g/cm
3, the content of vinyl acetate is 28%.
The melting index of described linear low density polyethylene is 1-10g/10min, and density is less than 0.92g/cm
3
Described carbon black is common graphitized carbon black or superconduction carbon black, and this sooty carbon black particle particle diameter is 15-30nm, and the BET specific surface area is 125-1000m
2/ g.
Described linking agent is oxidation dicumyl, di-t-butyl peroxide, 2,5-dimethyl-2,5-two (t-butyl peroxy)-acetylene or 2,5-dimethyl-2,5 two (t-butyl peroxy)-hexane tertiary butyl hydrogen.
Described oxidation inhibitor is antioxidant 1010 or antioxidant 300.
The present invention relates to the preparation method of cable semi-conductive shielding material, may further comprise the steps:
The first step, with the carbon black of the oxidation inhibitor of the linear low density polyethylene of 100 weight parts or ethene-vinyl acetate copolymer, 0.1-5 weight part and 10-50 weight part together put into Banbury mixer mixing carry out mixing;
Describedly mixingly be meant that in temperature be under the environment of 373K-378K mixing 10-15 minute.
In second step, insulation behind the 0.1-5 parts by weight of cross-linking agent adding Banbury mixer is mixing, obtain high voltage direct current cable and partly lead the shielding electric material.
Described insulation is mixing to be meant under the temperature of 373K-378K mixing 10-15 minute.
The present invention effectively suppresses gathering of space electric charge in the insulating material, and improve the electric field threshold value that space charge injects, the effect that the insulating material specific conductivity that reduction space charge limited current (SCLC) causes increases, making alive is after 60 minutes under-60kV/mm extra electric field, there is the space charge of more amount to inject in the cable insulation XLPE, because the electric field distortion rate that space charge causes has reached 40%; Adopt the conductive doped carbon black of EVA as semi-conductive shielding material, the quantity of electric charge that injects in the XLPE obviously reduces, under-60kV/mm extra electric field making alive after 60 minutes XLPE internal electric field aberration rate only be 14%; Adopt LLDPE doping superconduction carbon black as semi-conductive shielding material, the quantity of electric charge that injects in the XLPE also reduces to some extent, under-60kV/mm extra electric field making alive after 60 minutes XLPE internal electric field aberration rate only be 19%.
Description of drawings
Fig. 1. the embodiment of the invention 1 material is as semi-conductive shielding material, pressurization space charge and distribution map of the electric field in the insulating material XLPE in the time of 60 minutes under-60kV/mm extra electric field;
Wherein: a is a distribution of space charge, and b is an electric field distribution.
Fig. 2. the embodiment of the invention 2 materials are as semi-conductive shielding material, pressurization space charge and distribution map of the electric field in the insulating material XLPE in the time of 60 minutes under-60kV/mm extra electric field;
Wherein: a is a distribution of space charge, and b is an electric field distribution.
Fig. 3. the embodiment of the invention 3 materials are as semi-conductive shielding material, pressurization space charge and distribution map of the electric field in the insulating material XLPE in the time of 60 minutes under-60kV/mm extra electric field;
Wherein: a is a distribution of space charge, and b is an electric field distribution.
Fig. 4. the logarithmic curve chart of current density and extra electric field.
Embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
With 50 gram doping carbon black concentration is that the new LDPE (film grade) and 0.5 of 30%wt restrains antioxidant 1010 to put into the Haake torque rheometer mixing, melting temperature is 378K, mixing time is 10 minutes, again 1.15 gram dicumyl peroxides were put into the Haake torque rheometer mixing 10 minutes, melting temperature remains on 378K.Postmenstruation, crosslinking Treatment obtained a kind of semi-conductive shielding material that can be used for the high voltage direct current plastic cable.
Embodiment 2
With 35 gram ethene-vinyl acetate copolymers, 2 gram antioxidant 1010s, to put into the Haake torque rheometer mixing for 15 gram graphitized carbon blacks, melting temperature is 378K, mixing time is 10 minutes, again 1.15 gram dicumyl peroxides were put into the Haake torque rheometer mixing 10 minutes, melting temperature remains on 378K.Postmenstruation, crosslinking Treatment obtained a kind of semi-conductive shielding material that can be used for the high voltage direct current plastic cable.
Embodiment 3
With 35 gram linear low density polyethylenes, 0.5 gram antioxidant 1010, that 15 gram superconduction carbon blacks are put into the Haake torque rheometer is mixing, melting temperature is 378K, mixing time is 15 minutes, again 1.15 gram dicumyl peroxides were put into the Haake torque rheometer mixing 15 minutes, melting temperature remains on 378K.Again postmenstruation crosslinking Treatment, obtain a kind of semi-conductive shielding material that can be used for the high voltage direct current plastic cable.
Adopt the prepared material of above embodiment 1-3 as semi-conductive shielding material, measure insulating material XLPE under the extra electric field of-60kV/mm pressurization in the time of 60 minutes space charge and electric field distribution respectively as Fig. 1, Fig. 2, shown in Figure 3:
Under-60kV/mm external electric field, adopt the prepared material of embodiment 1, the injection of the like charges of more amount is all arranged near the both sides (A is an anode, and B is a negative electrode) of anodic-cathodic in the XLPE, the maximum value of XLPE internal electric field is-8.396 * 10
7V/mm, the electric field distortion rate is 40%;
Adopt the prepared material of embodiment 2, the quantity of electric charge that injects in the XLPE is less, has only very small amount of negative like charges to inject near a side of negative electrode, and the maximum value of XLPE internal electric field is-6.842 * 10
7V/mm, the electric field distortion rate is 14%;
Adopt the prepared material of embodiment 3, the quantity of electric charge that injects in the XLPE is also less, and the maximum value of XLPE internal electric field is-7.141 * 10
7V/mm, the electric field distortion rate is 19%.Adopt the prepared material of the present invention can significantly reduce electric field distortion in the plastic insulation XLPE as semi-conductive shielding material.
Adopt the prepared material of above embodiment 1-3 as semi-conductive shielding material, measure insulating material XLPE under same electric field not, the logarithmic curve of current density and extra electric field as shown in Figure 4.Be respectively at extra electric field-10kV/mm ,-20kV/mm and-30kV/mm electric field under, the material that adopts embodiment 2 and embodiment 3 is as semi-conductive shielding material, the current density of the XLPE that flows through is less.
Claims (9)
1, a kind of cable semi-conductive shielding material, it is characterized in that the component of this material and content thereof are: ethene-vinyl acetate copolymer or linear low density polyethylene 100 weight parts, carbon black 10-50 weight part, oxidation inhibitor 0.1-5 weight part and linking agent 0.1-5 weight part.
2, cable semi-conductive shielding material according to claim 1 is characterized in that, the melting index of described ethene-vinyl acetate copolymer is 150-400g/10min, and density is less than 0.96g/cm
3, the content of vinyl acetate is 28%.
3, cable semi-conductive shielding material according to claim 1 is characterized in that, the melting index of described linear low density polyethylene is 1-10g/10min, and density is less than 0.92g/cm
3
4, cable semi-conductive shielding material according to claim 1 is characterized in that, described carbon black is common graphitized carbon black or superconduction carbon black, and this sooty carbon black particle particle diameter is 15-30nm, and the BET specific surface area is 125-1000m
2/ g.
5, cable semi-conductive shielding material according to claim 1 is characterized in that, described linking agent is oxidation dicumyl, di-t-butyl peroxide, 2,5-dimethyl-2,5-two (t-butyl peroxy)-acetylene or 2,5-dimethyl-2,5 two (t-butyl peroxy)-hexane tertiary butyl hydrogen.
6, cable semi-conductive shielding material according to claim 1 is characterized in that, described oxidation inhibitor is antioxidant 1010 or antioxidant 300.
7, a kind of preparation method of cable semi-conductive shielding material according to claim 1 is characterized in that, may further comprise the steps:
The first step, with the carbon black of the oxidation inhibitor of the linear low density polyethylene of 100 weight parts or ethene-vinyl acetate copolymer, 0.1-5 weight part and 10-50 weight part together put into Banbury mixer mixing carry out mixing;
In second step, insulation behind the 0.1-5 parts by weight of cross-linking agent adding Banbury mixer is mixing, obtain high voltage direct current cable and partly lead the shielding electric material.
8, the preparation method of cable semi-conductive shielding material according to claim 1 according to claim 7 is characterized in that, describedly mixingly is meant that in temperature be under the environment of 373K-378K mixing 10-15 minute.
9, the preparation method of cable semi-conductive shielding material according to claim 1 according to claim 7 is characterized in that, described insulation is mixing to be meant under the temperature of 373K-378K mixing 10-15 minute.
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