CN204303435U - A kind of split isolation volume enlarging high pressure power cable of the insulation that bonds - Google Patents

A kind of split isolation volume enlarging high pressure power cable of the insulation that bonds Download PDF

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CN204303435U
CN204303435U CN201420786184.4U CN201420786184U CN204303435U CN 204303435 U CN204303435 U CN 204303435U CN 201420786184 U CN201420786184 U CN 201420786184U CN 204303435 U CN204303435 U CN 204303435U
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split
cable
conductor
strands
insulated
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金金元
朱水良
岳振国
钱朝辉
陈建平
张金林
盛雪良
朱忠明
杨士东
王勤良
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ZHEJIANG MORNING CABLE CO Ltd
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Abstract

本实用新型公开了一种粘结绝缘的分体隔离增容高压电力电缆,包括电缆外层和设于电缆外层中心的电缆芯,所述电缆芯由多个分割股块组成,所述分割股块由多条铜导线组成,所述分割股块呈扇形,多个分割股块环绕电缆中心形成一个整圆并包覆半导电包带,所述各分割股块之间设有绝缘纸,所述铜导线外包覆绝缘粘结胶。本实用新型将大截面导体电缆芯分割成彼此绝缘的几部分分割导体,在绞合前的每根铜导线上涂覆一层绝缘粘结胶,最大限度地减轻因集肤效应引起的导体交流电阻增大,有效地减小导体的损耗发热,增加导体的载流量,起到节能的效果。

The utility model discloses a bonded and insulated split isolation capacity-increasing high-voltage power cable, which comprises a cable outer layer and a cable core arranged in the center of the cable outer layer. The cable core is composed of a plurality of split strands, and the split The strands are composed of multiple copper wires, the split strands are fan-shaped, and the multiple split strands surround the center of the cable to form a complete circle and cover the semi-conductive tape. There is insulating paper between the split strands, The copper wire is covered with insulating adhesive glue. The utility model divides the large-section conductor cable core into several parts which are insulated from each other, and coats a layer of insulating adhesive on each copper wire before twisting, so as to reduce the conductor AC caused by the skin effect to the greatest extent. The increase in resistance can effectively reduce the loss and heat generation of the conductor, increase the current carrying capacity of the conductor, and achieve the effect of energy saving.

Description

一种粘结绝缘的分体隔离增容高压电力电缆A bonded and insulated split-isolation capacity-increasing high-voltage power cable

技术领域technical field

本实用新型涉及电力电缆技术。The utility model relates to the technology of power cables.

背景技术Background technique

目前国内外超高压、大容量输送电力,多采用1000mm2、1200mm2甚至更大截面到2500mm2的电缆,此种大截面电缆导体运行时内部极易产生涡流,导致导体温度上升,造成能量损耗。这是由于交流系统中集肤效应的存在,导致导体中的载流量并不是随电缆导体截面的增大而成正比例增加,而是当导体直径增大到一定程度时,集肤效应严重,导致导体的交流有效电阻即交流电阻会明显大于其直流电阻,因而单靠增大截面也就失去了其实用性和经济性。集肤效应会在每根导线中产生涡流,而且邻近效应也会在每根导线中产生涡流。因此,实际情况下不仅每根导线中存在涡流,导线间若未绝缘,导线间也会存在涡流。对电缆线路来说,集肤效应和邻近效应的存在将使电缆线芯的交流电阻增大,从而使电缆的允许载流量减小,也就是电缆浪费了很大部分输送电流。At present, for ultra-high voltage and large-capacity power transmission at home and abroad, cables with a cross-section of 1000mm 2 , 1200mm 2 or even larger to 2500mm 2 are mostly used. The conductors of such large cross-section cables are prone to eddy currents during operation, which will cause the temperature of the conductor to rise and cause energy loss. . This is due to the existence of the skin effect in the AC system, the current carrying capacity in the conductor does not increase proportionally with the increase of the cable conductor cross section, but when the conductor diameter increases to a certain extent, the skin effect is serious, resulting in The AC effective resistance of the conductor, that is, the AC resistance, will be significantly greater than its DC resistance, so simply increasing the cross-section will lose its practicality and economy. Skin effect produces eddy currents in each wire, and proximity effect also produces eddy currents in each wire. Therefore, in reality, not only does eddy current exist in each wire, but also eddy current exists between wires if they are not insulated. For cable lines, the existence of skin effect and proximity effect will increase the AC resistance of the cable core, thereby reducing the allowable carrying capacity of the cable, that is, the cable wastes a large part of the transmission current.

实用新型内容Utility model content

本实用新型所要解决的技术问题就是提供一种粘结绝缘的分体隔离增容高压电力电缆,最大限度地减轻因集肤效应引起的导体交流电阻增大,有效地减小导体的损耗发热,增加导体的载流量。The technical problem to be solved by the utility model is to provide a bonded and insulated split isolation and capacity-increasing high-voltage power cable, which can minimize the increase in the conductor AC resistance caused by the skin effect and effectively reduce the loss and heat generation of the conductor. Increase the ampacity of the conductor.

为解决上述技术问题,本实用新型采用如下技术方案:一种粘结绝缘的分体隔离增容高压电力电缆,包括电缆外层和设于电缆外层中心的电缆芯,所述电缆芯由多个分割股块组成,所述分割股块由多条铜导线组成,所述分割股块呈扇形,多个分割股块环绕电缆中心形成一个整圆并包覆半导电包带,所述各分割股块之间设有绝缘纸,所述铜导线外包覆绝缘粘结胶。In order to solve the above-mentioned technical problems, the utility model adopts the following technical scheme: a bonded and insulated split isolation capacity-increasing high-voltage power cable, which includes a cable outer layer and a cable core located at the center of the cable outer layer, and the cable core is composed of multiple The split strands are composed of multiple copper wires. The split strands are fan-shaped. The multiple split strands surround the center of the cable to form a complete circle and cover the semi-conductive tape. The split strands Insulating paper is arranged between the strands, and the copper wire is covered with insulating adhesive.

优选的,所述扇形的分割股块设有5个。Preferably, there are five fan-shaped split strands.

优选的,所述电缆外层从中心向外侧依次包括半导电内屏蔽、绝缘层、半导电外屏蔽、半导电缓冲阻水带、铝护套、沥青防腐层、外护套、导电层。Preferably, the outer layer of the cable includes a semi-conductive inner shield, an insulating layer, a semi-conductive outer shield, a semi-conductive buffer water-blocking tape, an aluminum sheath, an asphalt anti-corrosion layer, an outer sheath, and a conductive layer from the center to the outside.

优选的,所述电力电缆的截面积≥1000mm2Preferably, the cross-sectional area of the power cable is ≥1000mm 2 .

本实用新型为了最大限度地减轻因集肤效应引起的导体交流电阻增大,有效地减小导体的损耗发热,增加导体的载流量,将大截面导体电缆芯分割成彼此绝缘的几部分即形成分割导体,通过选择分割导体最佳结构,选择了有利于结构稳定的扇形股块通过预扭的5分割结构,这是最稳定结构。In order to minimize the increase of the conductor AC resistance caused by the skin effect, effectively reduce the loss and heat generation of the conductor, and increase the carrying capacity of the conductor, the utility model divides the conductor cable core with a large cross-section into several parts insulated from each other to form Split conductor, by selecting the best structure of the split conductor, the fan-shaped strands that are conducive to structural stability are selected through the pre-twisted 5-split structure, which is the most stable structure.

为了进一步降低大截面高压电缆的能量损耗,提高电缆的载流量,导体结构中每根导线均绝缘。因为超大截面电缆导体如采用绞合压紧结构,导电在输电过程中的集肤效应系数将达到54%;而若采用分割导体结构(分体隔离铜导体),集肤效应系数则会下降至26%;若分割导体结构中每根导线均绝缘(防涡流集中效应类的绝缘结构),导体的电热损耗则减小至8%。因此在绞合前的每根铜导线上涂覆一层绝缘粘结胶,该粘结胶粘结强度高,韧性好,在经过紧压绞合后,粘结胶不会开裂脱落,扇形预扭导体绞合采用分层和多轧辊逐层紧压的方法,粘结胶始终粘附的导体表面不会脱落和裂开。In order to further reduce the energy loss of large-section high-voltage cables and increase the carrying capacity of the cables, each conductor in the conductor structure is insulated. Because if the super-large cross-section cable conductor adopts a twisted and compacted structure, the skin effect coefficient of the conduction in the power transmission process will reach 54%; and if the split conductor structure (split isolated copper conductor) is used, the skin effect coefficient will drop to 26%; if each wire in the split conductor structure is insulated (insulation structure to prevent eddy current concentration effect), the electric heat loss of the conductor is reduced to 8%. Therefore, a layer of insulating adhesive is coated on each copper wire before stranding. The adhesive has high bonding strength and good toughness. Twisted conductor stranding adopts the method of layering and multi-roller pressing layer by layer, and the surface of the conductor that the adhesive glue always adheres to will not fall off or crack.

由于分割导体结构中每根导线均绝缘(防涡流集中效应类的绝缘结构),导体的电热损耗则减小至8%。分割导体表面光滑圆整,最大限度地减轻因集肤效应引起的导体交流电阻增大,有效地减小导体的损耗发热,增加导体的载流量,起到节能的效果。Since each wire in the split conductor structure is insulated (insulation structure for preventing eddy current concentration effect), the electric heat loss of the conductor is reduced to 8%. The surface of the divided conductor is smooth and round, which minimizes the increase in the AC resistance of the conductor caused by the skin effect, effectively reduces the loss and heat generation of the conductor, increases the carrying capacity of the conductor, and has the effect of saving energy.

在电缆铝套外涂覆沥青防腐层前预热电缆铝套,可避免因高压电缆的铝套温度过低而引起的沥青结块、沥青漏涂等现象。Preheating the cable aluminum sheath before coating the asphalt anti-corrosion layer on the outer surface of the cable aluminum sheath can avoid the phenomenon of asphalt agglomeration and asphalt leakage caused by the low temperature of the aluminum sheath of the high-voltage cable.

外护套挤包工艺设计采用双层共挤技术,外护套和导电层同时挤出。由于采用了双层共挤技术,导电层厚度均匀,与电缆护套粘结性能好,保证了外护套直流耐压性能的可靠性,而传统的工艺导电层采用石墨涂层,敷设时易脱落,污染生产和敷设现场环境。The outer sheath extrusion process design adopts double-layer co-extrusion technology, and the outer sheath and the conductive layer are extruded at the same time. Due to the double-layer co-extrusion technology, the thickness of the conductive layer is uniform, and the bonding performance with the cable sheath is good, which ensures the reliability of the DC withstand voltage performance of the outer sheath. However, the conductive layer of the traditional process uses graphite coating, which is easy to lay. Falling off, polluting the production and laying site environment.

附图说明Description of drawings

下面结合附图和具体实施方式对本实用新型作进一步描述:Below in conjunction with accompanying drawing and specific embodiment the utility model is further described:

图1为本实用新型电力电缆截面结构图。Fig. 1 is a cross-sectional structure diagram of a power cable of the present invention.

具体实施方式Detailed ways

一种粘结绝缘的分体隔离增容高压电力电缆,包括电缆外层和设于电缆外层中心的电缆芯,所述电缆芯由多个分割股块组成,所述分割股块由多条铜导线1组成,所述分割股块呈扇形,多个分割股块环绕电缆中心形成一个整圆并包覆半导电包带4,所述各分割股块之间设有绝缘纸3,所述铜导线外包覆绝缘粘结胶2,该电力电缆的截面积≥1000mm2A bonded and insulated split isolation capacity-increasing high-voltage power cable, comprising a cable outer layer and a cable core arranged in the center of the cable outer layer, the cable core is composed of a plurality of split strands, and the split strands are composed of a plurality of Composed of copper wire 1, the split strands are fan-shaped, a plurality of split strands surround the center of the cable to form a full circle and cover the semi-conductive tape 4, insulating paper 3 is arranged between the split strands, and the The copper wire is covered with insulating adhesive 2, and the cross-sectional area of the power cable is ≥1000mm 2 .

具体的,绝缘纸采用皱纹绝缘纸,所述扇形的分割股块设有5个。所述电缆外层从中心向外侧依次包括半导电内屏蔽5、绝缘层6、半导电外屏蔽7、半导电缓冲阻水带8、铝护套9、沥青防腐层10、外护套11、导电层12。Specifically, the insulating paper is crepe insulating paper, and there are five fan-shaped split strands. The outer layer of the cable includes a semi-conductive inner shield 5, an insulating layer 6, a semi-conductive outer shield 7, a semi-conductive buffer water-blocking tape 8, an aluminum sheath 9, an asphalt anti-corrosion layer 10, an outer sheath 11, Conductive layer 12.

为了最大限度地减轻因集肤效应引起的导体交流电阻增大,有效地减小导体的损耗发热,增加导体的载流量,就要将大截面导体分割成彼此绝缘的几部分即形成分割导体。本实用新型采用的解决方案,通过选择分割导体最佳结构,进一步降低大截面高压电缆的能量损耗,提高电缆的载流量,导体结构中每根导线均绝缘。因为超大截面电缆导体如采用绞合压紧结构,导电在输电过程中的集肤效应系数将达到54%;而若采用分割导体结构(分体隔离铜导体),集肤效应系数则会下降至26%。In order to minimize the increase in the AC resistance of the conductor caused by the skin effect, effectively reduce the loss and heat generation of the conductor, and increase the carrying capacity of the conductor, it is necessary to divide the large cross-section conductor into several parts that are insulated from each other to form a split conductor. The solution adopted by the utility model further reduces the energy loss of the large-section high-voltage cable by selecting the optimal structure of the divided conductor, and improves the carrying capacity of the cable, and each wire in the conductor structure is insulated. Because if the super-large cross-section cable conductor adopts a twisted and compacted structure, the skin effect coefficient of the conduction in the power transmission process will reach 54%; and if the split conductor structure (split isolated copper conductor) is used, the skin effect coefficient will drop to 26%.

若分割导体结构中每根导线均绝缘(防涡流集中效应类的绝缘结构),导体的电热损耗则减小至8%。因此在确定分割导体的结构时,本实用新型选择了有利于结构稳定的扇形股块通过预扭的5分割结构,这是本实用新型设计的最稳定结构。为此,在绞合前的每根铜导线上涂覆一层绝缘粘结胶,该粘结胶粘结强度高,韧性好,在经过紧压绞合后,粘结胶不会开裂脱落。由于涂覆一层绝缘粘结胶,分割导体结构中每根导线均绝缘(防涡流集中效应类的绝缘结构),导体的电热损耗则减小至8%。分割导体表面光滑圆整,最大限度地减轻因集肤效应引起的导体交流电阻增大,有效地减小导体的损耗发热,增加导体的载流量,起到节能的效果;扇形预扭导体绞合采用分层和多轧辊逐层紧压的方法,粘结胶始终粘附的导体表面不会脱落和裂开,绝缘涂覆层能适合在交联生产过程中硫化300℃高温不变性,能适合电缆在最高90℃时的正常运行状态。If each wire in the divided conductor structure is insulated (insulation structure to prevent eddy current concentration effect), the electric heat loss of the conductor is reduced to 8%. Therefore, when determining the structure of the segmented conductor, the utility model has selected the fan-shaped strands that are conducive to structural stability through the pre-twisted 5-segment structure, which is the most stable structure designed by the utility model. For this reason, a layer of insulating adhesive glue is coated on each copper wire before stranding. The adhesive glue has high bonding strength and good toughness, and the adhesive glue will not crack and fall off after being squeezed and twisted. Due to the coating of a layer of insulating adhesive, each wire in the divided conductor structure is insulated (insulation structure for preventing eddy current concentration effect), and the electric heat loss of the conductor is reduced to 8%. The surface of the divided conductor is smooth and round, which minimizes the increase in the AC resistance of the conductor caused by the skin effect, effectively reduces the loss and heat generation of the conductor, increases the carrying capacity of the conductor, and has the effect of saving energy; the fan-shaped pre-twisted conductor is stranded Using the method of layering and multi-roller pressing layer by layer, the conductor surface that the adhesive glue always adheres to will not fall off or crack, and the insulating coating layer can be vulcanized at a temperature of 300°C during the cross-linking production process. The normal operating state of the cable at a maximum temperature of 90°C.

分割导体的成缆工序与常规大截面导体成缆方式相同,主要工艺流程包括如下步骤:铜导体连退拉丝——导线清洗——绝缘粘结胶涂覆及烘干——扇形股块绞合——分割导体成缆——交联三层共挤——烘房脱气——缓冲带绕包——挤包铝护套——涂覆沥青防腐层——挤包外护套和导电层——测试。The cabling process of split conductors is the same as that of conventional large-section conductors. The main process includes the following steps: Copper conductor continuous drawing-wire cleaning-insulation adhesive coating and drying-sector strand stranding ——Split conductors into cables——Cross-linked three-layer co-extrusion——Drying room degassing——Wrapping buffer tape——Extruded aluminum sheath——Coating bitumen anti-corrosion layer——Extruding outer sheath and conductive layer --test.

此外,在铝护套外涂覆沥青防腐层前预热铝护套,可避免因高压电缆的铝套温度过低而引起的沥青结块、沥青漏涂等现象;外护套挤包工艺设计采用双层共挤技术,外护套和导电层同时挤出,使导电层挤包厚度均匀,与电缆护套粘结性能好,保证了外护套直流耐压性能的可靠性,而传统的工艺导电层采用石墨涂层,敷设时易脱落,污染生产和敷设现场环境,具有环保效果。In addition, preheating the aluminum sheath before coating the aluminum sheath with an asphalt anti-corrosion layer can avoid the phenomenon of asphalt agglomeration and asphalt leakage caused by the low temperature of the aluminum sheath of the high-voltage cable; the outer sheath extrusion process design Using double-layer co-extrusion technology, the outer sheath and the conductive layer are extruded at the same time, so that the thickness of the conductive layer is uniform, and the bonding performance with the cable sheath is good, ensuring the reliability of the DC withstand voltage performance of the outer sheath, while the traditional one The conductive layer of the process is coated with graphite, which is easy to fall off during laying, polluting the production and laying site environment, and has an environmental protection effect.

Claims (3)

1.一种粘结绝缘的分体隔离增容高压电力电缆,包括电缆外层和设于电缆外层中心的电缆芯,所述电缆芯由多个分割股块组成,所述分割股块由多条铜导线组成,其特征在于:所述分割股块呈扇形,多个分割股块环绕电缆中心形成一个整圆并包覆半导电包带,所述各分割股块之间设有绝缘纸,所述铜导线外包覆绝缘粘结胶。1. A bonded and insulated split isolation capacity-increasing high-voltage power cable, comprising a cable outer layer and a cable core located at the center of the cable outer layer, the cable core is composed of a plurality of split strands, and the split strands are composed of Composed of a plurality of copper wires, characterized in that: the split strands are fan-shaped, a plurality of split strands surround the center of the cable to form a complete circle and cover the semi-conductive tape, and insulating paper is arranged between the split strands , the copper wire is covered with an insulating adhesive. 2.根据权利要求1所述的一种粘结绝缘的分体隔离增容高压电力电缆,其特征在于:所述扇形的分割股块设有5个。2. The bonded and insulated split-isolation and capacity-increasing high-voltage power cable according to claim 1, wherein there are five fan-shaped split strands. 3.根据权利要求1所述的一种粘结绝缘的分体隔离增容高压电力电缆,其特征在于:所述电力电缆的截面积≥1000mm23 . The bonded and insulated split-isolation and capacity-increasing high-voltage power cable according to claim 1 , wherein the cross-sectional area of the power cable is ≥1000 mm 2 .
CN201420786184.4U 2014-12-12 2014-12-12 A kind of split isolation volume enlarging high pressure power cable of the insulation that bonds Expired - Lifetime CN204303435U (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104575824A (en) * 2014-12-12 2015-04-29 浙江晨光电缆股份有限公司 Fission isolation capacity-increasing high voltage power cable with high bonding insulation and manufacturing method
CN118969385A (en) * 2024-10-17 2024-11-15 穿越电缆集团有限公司 A high voltage special-shaped conductor power cable

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104575824A (en) * 2014-12-12 2015-04-29 浙江晨光电缆股份有限公司 Fission isolation capacity-increasing high voltage power cable with high bonding insulation and manufacturing method
CN118969385A (en) * 2024-10-17 2024-11-15 穿越电缆集团有限公司 A high voltage special-shaped conductor power cable
CN118969385B (en) * 2024-10-17 2025-01-10 穿越电缆集团有限公司 High-voltage special-shaped conductor power cable

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