CN1257593C - 电磁装置 - Google Patents
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- H01F2027/329—Insulation with semiconducting layer, e.g. to reduce corona effect
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- H01F2029/143—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias
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Abstract
一种电磁装置,其含有一产生磁场的电路,该电路包括一绕组(1)其具有至少一导电体(2)。该绕组含有一固态绝缘体(4)由外层及内层(3,5)包围,这些内、外层为等电位层及具有半导体特性。该至少一导电体(2)装设于半导体内层(3)的内部。本发明亦有关于控制电场的方法,及磁路的产生方法,以及用以形成绕组的电缆使用方法。
Description
技术领域
本发明涉及一种以电力为目的的电磁装置,其含有一产生磁场的电路,该电路包括至少一具有一绝缘系统的导电体。该电磁装置可被使用在任何电连接线上。其功率范围可从VA高至1000MVA。其主要目的是应用在高电压,可高达今日使用的最高传输电压。
本发明的第一方面,是企图使用一转动电机。该电机含有同步电机,其主要是做为连接至配电网路及输电网路等以下称为电力网路之发电机。该等同步电机亦被使用做为电动机及可供相位补偿以及电压控制,即该同步电机是作为机械性空转机。其技术领域仍包含双进给机、异步换流级联、外极心电机、同步通量电机及异步电机。
本发明的另一方面,是该电磁装置由一变压器或一电抗器所形成。变压器是被使用于所有电能的传输与分配,其任务是允许两个以上之电性系统之间电能的交换,且基于此一任务,电磁感应是以一已知方式被使用。主要使用于本发明的变压器属于所谓的电力变压器,其具有一从数百KVA高至超过1000MVA的额定功率,该额定功率含有一额定电压由3-4KV高至相当高的传输电压,400KV至800KV或更高。
虽然以下有关第二方面的已知技术的描述主要是关于电力变压器,本发明仍可应用于电抗器,如所周知,其可被设计成单相及三相电抗器。关于绝缘系统及冷却系统,原则上,电抗器及变压器具有相同实施例。因此,电抗器可采用空气绝缘、油绝缘、自身冷却及油压冷却等。虽然电抗器有一绕组(每一相)且可被设计成具有或不具有磁心,已知技术的描述仍与电抗器有相当大的关连。
该感应电磁的电路在一些实施例可以是空气环绕但包含一规定的磁心,该磁心是为叠板状、标准或定向、板状或其它形状,例如非均相或以粉末为基质、物质的、或其它可允许一交流通量的作用者,该电路亦包含一绕组。该电路常包含某种冷却系统。在转动电机的例子中,绕组可被安装于电机的定子或转子内,或者皆安装于两者内。
本发明亦包含在一电磁装置内控制电场的方法及制造磁路的方法。
背景技术
为能够解释及描述本发明,以下将讨论关于转动电机及电力变压器方面的已知技术。
转动电机
该转动电机将以同步电机举例说明。该说明的第一部分大致上是关于该电机的磁路及根据经典技术该磁路如何被组成。在大部分例子中磁路是被装设于定子,因此以下正常情况下,磁路将被当做成具有一叠板铁心(laminated core)的定子,磁路的绕组被当做成定子的绕组,及供绕组之用在叠板铁心内的凹槽将被当做定子凹槽或只是凹槽。
大部分的同步电机在转子内具有一磁场绕组,其中主通量是由直流电流所产生,以及在定子内有一交流绕组,该同步电机一般为三相设计。有时候,该等同步电机被设计成具有突状极心(salient poles)。后者在转子内具有交流绕组。
大型的同步电机的定子本体常被做成焊接结构的板钢。其叠板铁心通常由涂有清漆0.35或0.5mm的电板(electric sheet)做成。对于较大型的电机,电板是被冲制成段状,其借助于楔(wedges)/或楔形榫(dovetails)连接至定子本体。该叠板铁心是借助压力指梁及压力盘支持。
关于同步电机之绕组的冷却,可使用三种不同的冷却系统。
在气流冷却的例子中,定子绕组及转子绕组皆由流过的冷却气流冷却。冷却气流的通道位于定子叠板铁心,及转子内。为借助气流径向通风及冷却,至少用于中型及大型电机内的板状铁心被分隔成堆以使径向及轴向通风道安置于铁心内。冷却气流可由周围空气组成,但在高功率下,大致上使用一具有热交换器的闭合式冷却系统。氩气流冷却被使用于轮机发电机及大型的同步补偿器(synchronouscompensator)。该冷却方法之运作是与具有热交换的空气冷却方式一样,但可以使用氩气取代空气做为冷却剂。氩气较空气具有好的冷却容量,但其造成密封及测漏上的困难。已知使用水冷却在高功率的轮机发电机的定子绕组与转子绕组上。冷却通道成管状,装设于定子绕组之导体内。大型电机所面临的问题是其冷却不均匀,以致造成电机上的温度差异。
定子绕组是装设于板状铁心之凹槽(slots)内,该等凹槽通常具有矩形或梯形的截面积。每一绕组相包含有一些串联的线圈组且每一线图组包含一些串联的线圈。线圈的不同部分被设计成装设于定子内的线圈侧及装设于定子外部的线圈端。一线圈含有一个在高度及/或宽度上聚集一起的导体。每一导体之间有一薄绝缘体,例如是环氧树脂/玻璃纤维。
以线圈绝缘体使线圈与凹槽绝缘,也就是,绝缘体被用以对抗电机相对于接地的额定电压。至于绝缘材料,各种塑胶、清漆及玻璃纤维材料皆可被使用。通常使用所谓的云母带,是云母与硬质塑胶的混合物,其特别被制造提供抗阻以对抗可快速击穿绝缘体的局部放电。通过将云母带缠绕在线圈上数层而将绝缘体应用线圈上。该绝缘体被充填于线圈,然后线圈侧被涂上以煤碳为基质的涂料以改良线圈与连接至接地电位之周围定子的接触。
绕组的导体面积由讨论中的电流强度及使用的冷却方式所决定。导体及线圈通常为矩形以使凹槽内的导体材料量最大化。典型的线圈系由所谓的罗拔杆(Roebel bars)形成,其中某些杆可制成空心以装填冷却剂。一罗拔杆包含数个矩形、并联的铜导体,其等沿着凹槽被转成360°。环锋杆(Ringland bars)转成540°,且其它换位(transpositions)仍可能发生。换位是用以避免循环电流的发生,从磁场的观点来看,该电流产生于导体材料的截面。
基于机械性及电性的考虑,一电机无法制成任何大小。电机之功率实质上是由三个因素决定:
-绕组的导体面积。在正常操作温度下,铜,例如具有一最大值为3-3.5A/mm2。
-定子及转子材料的最大通量密度(磁通量)。
-绝缘材料的最大电场强度,即所谓的介电强度。
多相位交流绕组被设计成不是单层就是双层绕组。在单层绕组的例子中,每一凹槽仅有一个线圈侧。在双层绕组的例子中,每一凹槽有两个线圈侧。双层绕组通常被设计成菱形绕组,而单层绕组其与本发明之连接线相关,可以被设计成菱形的绕组或同心的绕组。在菱形绕组的例子中,只有一个线圈跨距(coil span)(或者可能两个线圈跨距)发生。而平坦的绕组被设计成同心绕组,也就是,具有相当大的线圈宽度变化。线圈宽度意指同一线圈中两线圈侧之间在圆形宽度之距离,不是与相关的绕组有关就是与数个中间的槽距有关。通常,不同的弦杆(chording)变体被使用,例如分数节距(fractionalpitch),其给予绕组理想的特性。绕组的形态实质上是描述凹槽内的线圈,也就是线圈侧,是如何在定子外部,即线圈端被连接在一起。
在定子的叠板铁心外部,线圈不具有经涂料半导体性质的接地电位层。线圈端通常具有电场控制,该电场控制是由所谓的可保护电晕之清漆形成,其可使径向电场转成轴向电场,其意味着线圈端的绝缘是在相对于接地的高电压发生。该情况有时候引起线圈端区域的电晕,此一电晕可能具有破坏性。在线圈端所谓的电场控制点引起转动电机的一些问题。
通常,所有巨型电机被设计成双层绕组及同样大的线圈。每一线圈装设是使得其一侧在一绕组层内及另一侧在另一绕组层内。其意指所有的线圈在线圈端互相交叉。假如使用多于两层的绕组层,这些交叉将使得绕组的运作困难且损坏线圈端。
已知同步电机/发电机与电力网路的连接须经由一Δ/Y连接的所谓的升压变压器,因为电力网路的电压通常高于转动电机的电压。与同步电机一起,该变压器因此构成一设备的整体。该变压器造成额外费用且引起系统的整体效率降低的不便。假如可以制造具相当高电压的电机,该升压的变压器将可省略。
过去数十年间,对于较高电压的转动电机其较之已往设计的转动电机的要求增加了。根据现有的技术,具有一良好线圈制造产量的同步电机其可达到的最大电压大约是25-30KV左右。
某些欲达到同步电机设计之新进展的企图被描述,特别是,刊载于J.Elektrotechnika,No.1,1970,pp.6-8,标题为“水及油冷却之轮机发电机TVM-300”之论文、U.S.4,429,244“发电机之定子“及苏俄专利文件CCCP专利955369。
描述于J.Elektrotechnika的水及油冷却同步电机欲使电压高达20KV。该论文描述一种由油/纸绝缘体可使定子完全沉浸在油里,该油在使用做为绝缘体的同时亦可做为冷却剂。为防止油从定子漏向转子,一介电油隔离环被装设于铁心的内表面。定子绕组系由具有扁圆形空心形状的导体形成,该定子绕组具有油及纸绝缘系统。线圈侧与其绝缘体通过楔(wedges)固定在矩形截面的凹槽内,至于冷却油是使用于空心导体内及定子壁内的孔洞。然而,该等冷却系统在线圈端处引起相当大数目之油及电的接头(connections)。该厚绝缘体亦造成导体曲率半径的增加,其接着增加了绕组悬垂(winding overhang)的大小。
上述美国专利是关于一同步电机之定子部件,该同步电机包含一由具有梯形槽的叠板状磁心,该等梯形槽供定子绕组用。该等凹槽系逐渐变小,因为朝往转子内部的定子的绝缘体系较小,且于转子内部的绕组部分最接近中立点(neutral point)。除此之外,该定子部含有一最接近磁心内面的介电油隔离圆柱体。该定子部其相对于不具备该环之电机可能提高磁化强度的要求。该定子绕组由浸油的电缆制成,在每一线圈层中的这些电缆具有相同直径。这些线圈层借助于凹槽内的间隔装置(spacers)互相隔开且通过楔固定。绕组特殊之处在于其含有两个串联、所谓的半绕组。该二半绕组之一安装于一绝缘套筒内部中心。定子绕组的导体由周围的油类冷却。在系统内含有大量油的不足会导致漏油的危险及因故障可能导致的相当量的清洁工作。位于凹槽外面的绝缘套筒部分具有一圆筒状部及一圆锥形端,该圆锥形端由携带电流层加强,而该位于凹槽外面的绝缘套筒部分之责任是控制电缆进入端部绕组处的电场强度。
CCCP955369明显地企图提高同步电机的额定电压,该同步电机的油冷却定子绕组含有在所有线圈层内大小一样的已知高电压电缆。该电缆系安置于定子凹槽内,该定子凹槽为圆形,于径向装设对应电缆截面积的开口及供固定填充冷却剂之用的必要空间。各个径向装设的绕组层被包围且固定在绝缘管内。绝缘隔片(insulating spacer)将这些管子固定在定子凹槽内。由于属于油冷却,故仍须一内部介电环以密封油冷却剂防止内部有空气缝隙。该设计在不同的定子凹槽之间亦展现一非常窄的径向中央部,其意指一大量的凹槽漏电磁束,此一大量的漏电磁束相当影响电机磁化强度要求。
EPRI、EL-3391研究所于1984年一篇报告中,提出无须中间变压器即可连接电机至电力网路的转动电机其可达到更高电压的电机概念。此一解决方法经调查证实可提高效率及提供相当大经济效益。在1984年开始发展发电机以便直接连接至电力网路被认为可行的主要原因是当时超导转子已被制造。超导磁场的巨大磁场容量使得使用一足够厚的空气缝隙绕组以抵抗电应力成为可能。依据设计一磁电力其具有一绕组所谓的单石圆柱体电枢(monolith cylinder armature),其中该绕组含有两个导体圆柱体,其等同心地安置在三个圆柱形绝缘壳体内且整体构造系无须齿器(teeth)而被固定在铁心上,一高电压的旋转电机被认为可直接连接至一电力网路。其解决方法在于主绝缘体必须有足够厚度以与网路对网路及网路对接地的电压相抗衡。该绝缘系统是回顾现有技术之后,经判断必须增加至一较高电压,其通常使用于电力变压器且由充满介电流体的纤维素压力板组成。此一建议性解决方法的明显不足在于除了需要一超导转子外,尚需要一非常厚的绝缘体,其增加了电机的大小。线圈端必须使用油或氟里昂绝缘及冷却以控制在端处的巨大电场。整体电机必须密封以防止液体介电质吸收大气中湿气。
依据现有的技术制造转动电机时,其绕组是使用导体与绝缘系统经数步骤制造,其中该绕组在安装在磁路之前必须预成形。绕组安装在磁路之后,须施行浸透以制备绝缘系统。
电力变压器/电抗器
为将本发明的电力变压器/电抗器放在适当的上下文关联中而能描述出本发明的新突破及其对已知技术所提供的优点,对本发明设计的电力变压器的相当完整的描述及当计算、设计、绝缘、接地、制造、使用、测试、运送等这些变压器所面临到的限制及问题在以下先予提出。
纯粹就一般观点而言,一电力变压器的首要任务系允许通常为相同频率但不同电压的两个或更多的电力系统之间电能的交换。
已知的电力变压器包含一变压器铁心,以下称做铁心,经常由定向叠板、矽铁制成。该铁心包含若干铁心柱(core limbs),这些铁心柱通过轭铁(yokes)连接在一起以形成一个或多个铁心视窗。具有该种铁心的变压器通常称做铁心变压器。这些铁心柱周围有若干绕组。该若干绕组一般称做初级、次级或控制绕组。在电力变压器的情况下,这些绕组即实际地沿着铁心柱的长度同心排列及分布。该铁心变压器通常具有圆形线圈及逐渐变小的铁心柱截面以尽可能紧密地填满线圈。
尚有其他已知的铁心设计形态,例如包含在所谓的壳状变压器的铁心。这些铁心经常被设计成具有矩形线圈及矩形铁心柱截面。
位于上述电压范围较低部分的已知电力变压器,有时被设计以空气冷却以带走无法避免的固有损失。为避免接触,及可能地降低变压器的外在磁场,通常该变压器被供以一具有通风口的外部毂体。
而大部分的已知变压器是以油冷却的。原因之一是油具有做为绝缘介质此一额外非常重要的功能。一油冷却及油绝缘的电力变压器由一外槽所包围,从以下的描述将可清楚地看出,对此将有相当高的需求。通常线圈的水冷却装置被提供。
以下之叙述大部分是关于填满油之电力变压器的。
变压器的绕组是由一若干串联线圈圈数构成的一或数个串联线圈形成。除此以外,这些线圈具有一特别装置可允许线圈端部间的转换。此一装置可设计成拨换方式(changeover),其借助于螺旋接合的帮助或更通常是借助于一特殊的可在槽附近操作的拨换开关的帮助。一变压器在电压之下产生拨换时,该拨换开关被当作一负载分接头转换器,然而在其他状态它被当作一不带电的分接头转换器。
关于高功率范围的油冷却及油绝缘电力变压器,该负载分接头转换器的断裂元件被安置在装满油的特殊容器内,该容器直接连接至变压器的外槽。该断裂元件经由一马达驱动转轴纯粹机械性操作且被安排以致在转动期间当接触是打开时可获得快速移动及当接触关闭时获得较慢移动。然而,该负载分接头转换器被装设于实际变压器的外槽。操作期间,引起电弧及电花。此导致容器内油的裂解。为获得较少电弧以致较少烟灰形成及在接触上有较少磨损,该负载分接头转换器通常连接至变压器的高电压端处。这是由于在高电压处须要被个别阻断及连接的电流与负载分接头转换器连至低电位处时的情况相比要小。对于装满油的常规电力变压器的故障统计显示出负载分接头转换器常引起故障。
在油冷却及油绝缘电力变压器的低功率范围,该负载分接头转换器及其等断裂元件皆装设于外槽内部。此意味着操作期间由电弧造成的油裂解的上述问题等影响整个油系统。
从施予或应电压观点来看,广泛言之,静态地横跨于一绕组之电压,其系被均等地分配在绕组的每一圈,也就是在所有线圈圈数上电压系相等。
然而,从电位观点来看,情况则完全不一样。绕组的一端通常接地。然而,此意指每一圈线圈的电位是由最靠近接地电位的线圈圈的实际零电位线性增加至在绕组的对应于施予电压的另一端的线圈圈电位。
此一电位分配决定了绝缘系统的组成,因为在绕组相邻的线圈圈之间及每一圈与接地间有足够的绝缘体是必要的。
个别线圈上的圈数通常被聚集成一几何上同向单元,物理上与其他线圈相界定。这些线圈之间的距离仍是由产生于线圈之间的介电应力决定。此意味着线圈间仍需要某一绝缘距离。根据上述,对于那些在局限于线圈内的电位的电场之内的其它导电物体,也需要足够的绝缘距离。
由上所述,明显地,对于个别的线圈,物理上相邻的导体元件之间内在电位差相当低,然而与其他金属体-亦包括其它线圈-的外在电压差可能相当高。该电位差是由磁感应的感应电压及电容性分配的电压所决定,该电容性分配的电压可能由变压器的外在连接线上的一外部连接电性系统所产生。这些可从外部进入的电压类型除了操作电压之外,包含闪电过电压及交换过电压。
在线圈的电流引线内,由于导体周围磁漏场的存在导致额外的耗损。为使这些耗损尽可能地降低,特别是对于高功率范围的电力变压器而言,这些导体通常被分成若干导体元件,通称为线股(strands),它们在操作间系为并联。这些线股必须根据每一线股上的感应电压尽可能为一样的模式换位,以致每一线股间的感应电压之差异尽可能小而使内在循环电流分量从损耗的角度而言降低到合理值。
依据已知技术设计变压器上,其一般目标是在所谓的变压器视窗限定面积内有数量尽可能大的导体,如通常所叙述的其充填因子尽可能高。该可获得的空间,除了导体材料外,仍包含结合于线圈的绝缘材料,部分是位于线圈之间及部分是涉及其它金属部分包括磁心。
该绝缘系统是部分在一线圈/绕组之内及部分在线圈/绕组与其它金属部件之间,其最接近个别导体元件处常被设计成固态纤维素或清漆基底之绝缘体,及在该导体元件外部设计成固态纤维素及液态,亦可能是气态的绝缘体。具有绝缘体及在此种方式上可能为拉条部件(bracing parts)的绕组提供巨大体积,其受到高电场强度的作用,此高电场强度产生于变压器的有效电磁部件内及其周围。为了能够预先决定所引起的电介质应力及冒最低故障之险以得到一注明尺寸,需要有关于绝缘材料性能的良好知识。同样重要的是获得不会改变或降低绝缘特性的周围环境。
高电压电力变压器的现阶段占优势的绝缘系统含有纤维材料做为固态绝缘体及变压器油作为液态绝缘体。该变压器的油以矿油为基础。
该变压器油具有双重功能,除了绝缘的功能之外,其可移除变压器之散热而冷却铁心、绕组等。油冷却需要一油泵浦、一外部冷却元件、一胀缩联结器等。
变压器外部连接线与直接连接的线圈/绕组之间的电连接关系,被当做是一绝缘套,用于套在经过外槽的一导电性连接接线上,该外槽在装满油的电力变压器中用以包围该变压器。该绝缘套通常是一分开固定于该外槽的分离元件,其经设计可符合外槽外面与内面的绝缘条件,同时它亦可抵抗电流负载的发生与伴生的电流力。上述关于绕组的绝缘系统的要求条件仍可应用在线圈之间、绝缘套与线圈、不同类型的交换开关及绝缘套等之间必要的内部连接线。
变压器内部所有的金属元件除了携带电流的导体外,通常为接地。依此方式,可避免一不必要的、难以控制的电位增加产生,此一电位增加是由于高电位的电流引线与接地之间电容性电压分配所引起。此一不必要的电位增加可能造成部分放电,即所谓的电晕。电晕可能在一般验收试验期间显现,其与额定数据、增加的电压及频率比较,系部分发生。电晕在操作期间可造成损坏。
在变压器的个别线圈必须具有一机械注明尺寸使其可抵抗任何应力的产生,这些应力是在短路期间电流与所导致的电流力的结果。通常,线圈系设计成所产生之电流力在每一个别线圈之内被吸收,其可能意味着线圈无法做成用于正常操作之正常功能的适当尺寸。
装满油的电力变压器的一较窄电压和功率范围内,绕组被设计成所谓的板状绕组。此即是上述的个别导体是由薄板代替的。以板片绕组的电力变压器被造成电压高达20-30kV,功率高达20-30MW。
高功率范围内的电力变压器的绝缘系统,除了需要一相当复杂的设计外,仍需要特殊制造方法以最佳方式利用该绝缘系统的特性。为获得一良好的绝缘体,该绝缘系统具有一低湿度含量,绝缘体的固体部分将以油浸透且残留气囊在固体部分的风险可减至最低。为确保起见,具有绕组的铁心降入槽之前,执行一特殊干燥及沉浸工艺。之后,变压器降入槽内,然后密封该槽。在装满油之前,放入变压器的该槽必须真空。这是通过一特殊真空处理方式达成。当槽真空时,即填满油于槽内。
为获得保证的服务寿命等,必须以真空处理方式抽真空至几乎绝对真空。因此变压器的该外槽被事先建议设计成完全真空而这使得所消耗的材料及制造时间都相当多。
假如在一装满油的电力变压器中产生放电,或者在变压器的任何部分发生局部温度的明显增加,油将裂解且气态产物溶解于油内。因此变压器通常装有监测装置用以监测溶解在油内的气体。
基于重量的考虑,大型电力变压器运送时并不装填油。原则上,变压器在顾客处的现场安装又要求采取更新真空处理方式。除此之外,这还是一个每当打开外槽以便采取某些动作或检查所应重复执行的处理过程。
明显地这些处理过程非常耗时及花钱,且占制造及检修总时间的相当一部分而在同时需要获得广泛的资源。
常规电力变压器的绝缘材料构成变压器总体积的一大部分。高功率范围的电力变压器,其油量可在数百立方米。该油与柴油具有一定的相似点,它是稀释流体,且该油显示一相当低的发火点。因此明显地,在无意的加热情况下,例如内部飞弧与最终漏油,油与纤维素构成不可忽视的火险。
再者,显然地,特别是装满油的电力变压器的情况下,存在着相当大的运送问题。此一高功率范围内的电力变压器可具有高达1千顿之总重。可以理解的是,变压器的外部设计有时必须适合于目前的运送路线,如桥梁、隧道等。
接着是有关装满油的电力变压器的已知技术概述,其可当作是常规变压器的限制与其问题来描述:
常规装满油的电力变压器
-包含一外槽,该外槽内放置一变压器,该变压器含有一具有线圈的变压器铁心、用以绝缘与冷却的油、各种机械性的拉条装置等。该外槽有相当大的机械需求,因为该外槽不装填油而安装有变压器时,能够将该外槽完全抽真空。该外槽需要非常广泛的制造及测试过程,且其外部巨大的尺寸亦造成相当的运送问题:
-通常含有一所谓的油压冷却。该油冷却方法需要一油泵装置、一外部冷却元件、一胀缩容器及一胀缩联结器等
-在变压器的外部连接线与以绝缘套形式固定于外槽的直接连接的线圈/绕组之间具有一电性连接关系。该绝缘套经设计可符合外槽外部与内部的任何绝缘体的要求。
-含有线圈/绕组,该等导体被分开成若干导体元件、线股,该等线股必须被换位使每一线股内所感应的电压尽可能相同以致每对线股之间感应电压的差异可能地小。
-含有一绝缘系统,其部分在线圈/绕组之内及部分在线圈/绕组与其他金属元件之间,该绝缘系统经设计成一以固体纤维素或清漆为底、最靠近个别导体元件的绝缘体,且于该个别导体元件绝缘系统外部,固体纤维素与一液体,亦可能是气体的绝缘体。除此之外,相当重要的是该绝缘系统显示一相当低的湿气含量;
-含有一负载分接头转换器其为一整体元件,被油包围且通常连接至变压器的高电压绕组以做为电压控制;
-含有油,其可能引起内部部分放电,所谓的电晕-负载分接头转换器的电花与其他漏油故障有关的不可忽视的火灾危险;
-通常含有一侦测装置用以监测溶解于油内的气体,其发生于油内的放电或区域性温度升高的情况下;
-含有油,在毁损或意外之情况下可导致漏油而造成广大的环境破坏。
发明内容
本发明的主要目的是提供一电磁装置,其中至少一或若干上述的缺点及其对已知技术的损害可被减低。除此之外,本发明的第二目的在于设计一种方法,其是用于为了电力目的的电磁装置的电场控制方法,及一种产生转动电机的磁路的方法。
主要目的是借助于下文的权利要求书所界定的装置来达成,然后首先是权利要求1,2,3,4及5之任何一项所界定的特征部分。
就广泛的意义而言,依据本发明的设计减少了耗损的发生,据此该装置可以较高效率操作,其原因在于本发明使得实质上包围住绝缘系统内的该导电体产生的电场成为可能。该耗损的减低致使该装置的温度降低,其减少冷却的需要及使得产生冷却的装置可以比常规方法更为简单的方式设计。
依据本发明的导电体/绝缘系统可以理解成一有弹性的电缆,其意指与至今为常规技术的预先制造的、刚性绕组相比较,在制造与安装上有实质的优点。依据本发明所使用的绝缘系统则无须使用气态与液态绝缘材料。
至于本发明做为转动电机的方面,可以以如此高电压操作该电机,所述高电压使得上述Δ/Y连接的升压变压器可以被省略。也就是,该电机可以用较已知电机明显高得多的电压操作而能够直接连接至电力网路。其意指具有转动电机的系统的投资费用明显降低,而其总效率却提高。本发明减少了绕组某些面积的电场控制方法的需要,该电场控制方法依据已知技术是必要的。进一步的优点是本发明使低磁化与过磁化的获得更为容易,该低磁化与过磁化用于降低电压与电流彼此不同步时所产生的无功效应。
至于本发明做为电力变压器/电抗器的方面,本发明,首先,减少电力变压器装满油的需要以及相关的问题与不足。
绕组的设计,其包含,一由固态绝缘材料形成的绝缘体,其沿着绕组长度的至少一部分,该绝缘体向内有一内层及向外有一外层,这些层是由半导体材料制成而使得包围住整个装置的电场在绕组里面成为可能。在此使用的固态绝缘材料指该绕组不含有液体或气体绝缘体,例如以油的形式。取而代之地,该绝缘体欲由高分子材料制造。该内层与外层亦由高分子材料形成,虽然半导体亦为一种高分子材料。
该内层与该固态绝缘体在基本上整个界面上彼此刚性连接。再者,该外层与该固态绝缘体亦在介于其间的基本上整个界面上彼此刚性连接。该内层的半导体特性使其等电位操作,据此,其向外的电场亦相等。该外层亦欲以半导体材料来制造,其至少有一导电性较高于该绝缘体的导电性致使该外层通过连接地电位或一相当的低电位可等电位运作以及实质上包围住该外层向内的该导电体产生的电场。另一方面,该外层具有一电阻率足以使该外层的电耗损降至最低。
该绝缘材料与该半导体内层及该外层之间的刚性连接在基本上整个界面上是一致的,因此没有凹处、孔洞或其他类似者产生。依据本发明所欲达到的高电压,其可能造成的电与热负载将加予绝缘材料相当的负担。已知所谓的部分放电,PD,通常造成在高电压装置的绝缘材料上的一严重问题。假如在一绝缘层上产生凹处、孔洞或其他类似者,内部电晕放电可能在高电压发生,而使该绝缘材料逐渐裂解,其结果可能是整个绝缘体破坏。此可导致该电磁装置严重故障。因此,绝缘体应为均相。
该绝缘体的内层具有一导电系数低于导电体的导电系数,但其足以使内层等电位操作,且据此,使内层外在电场相等。此结合内层与电绝缘体在基本上整个界面的刚性连接,也就是不存在有凹洞等,欲使内层的外在电场实质一致以及PD的危险降至最低。
该内层与固态电绝缘体优选由具有实质上相等的热膨胀系数的材料制造。同样地,该外层与固态绝缘体优选是尽可能具有等热膨胀系数材料。此意指内层与外层及固态电绝缘体将形成一绝缘系统,其在温度改变时如同一单体部分一样作均匀的热胀冷缩,而不会因温度改变而引起在界面上的任何破坏或瓦解。因此内层与外层及固态绝缘体之间接触面的贴近被确保并且在延长的操作期间可维持此种接触面的贴近。
在绝缘系统上的电负载降低,其导因于包围绝缘体之内与外层的半导体材料将倾向于形成基本等电位的表面,且以此方式在绝缘体内的电场将适当地相当均匀分配在整个绝缘体的厚度上。
已知,就其本身而言,有关于高电压与电能输送的输送电缆其设计具有一固态绝缘体的导电体,该固态绝缘体的内层与外层为半导体材料。关于电能的输送,长久以来系被理解为绝缘体应当无缺陷。然而,在用以输送的电压电缆内,沿着电缆的长度电势并未改变,基本上是等位能的。再者做为传输目的的高电压电缆内,由于瞬变发生,如闪电,可能产生瞬间电位差。依据本发明,依据所附的权利要求书,一柔性电缆在电磁装置上被使用做为绕组。
通过由较小的、所谓的线股(strands),其中至少有些是彼此绝缘的,在绕组内制造导电体可以达成另一改良。通过将这些线股制成具有一相当小的截面,优选近似于圆形,跨越该等线股的磁场将显示一与磁场有关的定几何形状,而且涡电流(eddy currents)的发生减至最低。
依据本发明,因此绕组优选制成电缆形状,其至少含有一导电体及先前描述的绝缘系统,该绝缘系统的内层围绕着导体的线股延伸。此一半导体内层的外部是电缆的主要绝缘体,由固态绝缘材料形成。
依据本发明的半导体外层,应当显示沿着导体等电位此一电特性。然而,该外层可能未显示一感应电流将沿着其表面流动的此一电特性,这种电流流动可能导致耗损,接着可能产生不希望的热负载。权利要求8和9所界定的内层与外层的电阻记载(在20℃)是有效的。关于半导体内层,其必须具有一足够的导电系数以确保电场的等电位,但同时该层必须具有一电阻率可确使该电场被封住,重要的是该内层使导体表面之不规则性均等化且形成一等电位表面,该等电位表面在与固态绝缘体的界面上具有一高电位面。该内层可被制成具有变化的厚度,但为确使导电体及固态绝缘体有平坦的表面,该厚度宜在0.5至1mm之间。
本发明在电磁装置上使用的这一具弹性的绕组电缆是XIPE(交联状聚乙烯)电缆或一具有EP(乙烯-丙烯)橡胶绝缘体或其他橡胶的电缆的改良,如砂钢。该项改良包含,尤指,一新设计,该新设计是关于导体的线股以及至少在某些实施例中,电缆不具备机械性保护的外壳。然而,依据本发明,可以安装一可传导的金属屏蔽物与一外炉头(outer mantel)于半导体外层的外部。该金属屏蔽物将具有一外部机械性与电性(如闪电)保护的特性。该半导体内层优选位于导电体的电位。为此目的,导电体的至少一线股将是未绝缘的及被装设以使该导电体与该半导体内层可获得一良好电接触。另一方法是不同的线股可交替地与半导体内层有电接触。
依据上述制造变压器或电抗器的电缆绕组造成在常规电力变压器/电抗器与本发明的电力变压器/电抗器之间的电场分配上极大的差异。本发明由电缆制造的绕组其无庸置疑的优点是电场被包在绕组内,因此在半导体外层的外部没有电场。由携带电流的导体所产生的电场仅发生在固态主绝缘体内。从设计观点与制造观点来看,此意味相当的优点:
-制造变压器之绕组时,无须考虑任何电场分配,且已知技术所提及线股的换位(transposition)可忽略;
-变压器的铁心设计无须考虑任何电场分配;
-绕组的电绝缘体不需要油,也就是,绕组的介质环境可为空气;
-变压器外部连接线与瞬间连接的线圈/绕组之间不需要特别的电性连接,因为该电性连接,其相反于已知的制法,与绕组为一体;
-本发明的变压器所需要的制造与测试技术与常规的电力变压器/电抗器相比更为简单,因为不需要已知技术所提及的沉浸、干燥与真空处理。此亦提供相当短的制造时间;
-通过使用本发明的绝缘体技术,发展已知变压器的磁性部件成为相当可能。
本发明应用在转动电机时,可以使在定子上的热负载明显降低。因此,电机的暂时性超负载将不太危险,且在超负载下驱动电机较长时间将不致有损毁的危险。此给予发电厂之拥有者相当益处,这些拥有者在现今操作受扰乱的情况下,被迫快速转换至其它设备以确保法律上规定的输送条件。
使用本发明的转动电机,其保养费可降低相当多,因为连接电机至电力网路时不须包括电变压与断电器于系统内。
如上述绕组电缆的半导体外层被连接至接地电位。其目的在于该外层沿着绕组电缆的整个长度须实质上保持在接地电位。将半导体外层切割成若干沿着绕组电缆长度分配的相等部分且每一个别外层部分可直接连接至接地电位。依此方式沿着绕组电缆的长度可获得较佳的一致性。
如上述固态绝缘体及内、外层可通过例如挤压,来完成。其它的技术亦为可行,例如通过喷溅物质在导体/绕组上可分别形成该等内层、外层及绝缘体。
绕组电缆较佳设计成具有圆形截面积。然而,其他的截面积依然可被采用以获致较佳的填密密度(packing density)。
为在转动电机上构建一电压,电缆以若干连续圈数装设于磁心之凹槽内。绕组可被设计成多层同心电缆绕组以减少线圈端交叉数目。电缆可设计成锥形绝缘体从而以较佳方式使用磁心,在此情况下,凹槽之形状可适合于绕组的锥形绝缘体。
本发明转动电机一极大优点是外层半导体外部的线圈端(coil-end)区域的电场趋近于零,以及在外层位于接地电位的情况下,其电场无须控制。此意味着在铁心板片内(sheets)、线圈端区域或两者之间过渡地带并无电场集中。
本发明亦有关于一种依据后附的权利要求41,用以制造磁路的方法,其中一弹性电缆被穿入转动电机的磁心凹槽内的开口内以作为绕组。因为该电缆是有弹性的,其可被弯曲,这使得一电缆长度可以若干圈的方式安置于线圈内。之后,线圈端将由电缆的弯曲区域(bendingzones)组成。电缆亦可依此方式被连接以使其特性在整个电缆长度上保持一定。此一方法较之已知技术更为简单。所谓的罗拔杆(Roebelbars)并不具弹性但须制成所希望的形状。在现今制造转动电机时,沉浸线圈亦是一非常复杂及昂贵的技术。
总而言之,因此,本发明的转动电机相对于已知的电机具有不少重要的优点。首先,它可直接连接至所有高电压形态的电力网路。在此所指的高电压是超过10KV,并且高达电力网路的电压。另一重要优点是一选择的电位,例如接地电位,沿着整个绕组一致地传导,其意味着线圈端区域可以是紧密的并且在线圈端区域的拉条装置(bracingmeans)可应用在实际的接地电位或其他被选择的电位。仍有另一重要优点是以油为基质的绝缘体及冷却系统亦在转动电机消失,这在上文关于电力变压器/电抗器的描述中已经指出。此意味着不会有密封的问题造成以及不需要上述的介电环。亦有一优点是所有的压流冷却(forced cooling)可以做成接地。
本发明提供了一种电磁装置,该电磁装置包含一个高压绕组,该高压绕组包括至少一个具有一个绝缘系统的导电体,其特征在于该绕组由一个可挠曲的高压电缆形成,并且该绕组电缆的绝缘系统包含一个由固态绝缘材料形成的电绝缘体,该绝缘体外部有一外层,此外层的导电系数大于绝缘体的导电系数,使得该外层可通过接地或连接至一个较低的电位来使其电位相等,并实质上包围住由外层内部的所述导电体所造成的电场,该绝缘系统包含一个位于绝缘体内部的内层,至少一个导电体位于内层的内部,并且该内层所具有的导电系数低于该导电体的导电系数,但足以使该内层的电位相等,并由此使该内层外部电场相等,
所述内层和外层由一种具有导电性成分的高分子材料形成。
附图说明
参考附图,以下是本发明实施例的具体说明。
附图中:
图1是经电流调整之标准电缆的部分示意图;
图2是本发明磁路的扇形/或极心螺距(sector/pole pitch)的轴端示意图;
图3是已知电力变压器/电抗器的绕组周围电场分布示意;
图4是本发明电力变压器实施例的透视图;
图5是依据图1改良之电缆构造的截面示意图,其具有若干导电体;及
图6是另一种电缆构造的截面示意图,其含有若干导电体,该等导电体是另一种组合方式。
具体实施方式
图1及图2的转动电极
依据本发明的说明可以制造磁路的重要条件是以一导电体电缆做为绕组,该导电体电缆具有一固态绝缘体,该固态绝缘体具有一介于该绝缘体与位于其内的一或多个导电体之间的半导体内层或内壳,以及具有一位于该绝缘体外部的半导体外层或外壳。这些电缆可以在其他电力工程领域,也就是电力输送,使用的标准电缆。为说明一实施例,首先对标准电缆做一简要说明。该内部携带电流的导体含有若干非绝缘线股。一半导体内层包围这些线股。一固态绝缘层包围该半导体内层。该固态绝缘层是由具有低电耗损及高击穿强度的高分子材料形成。具体例子有聚乙烯(PE)及特别是交链型聚乙烯(XLPE)以及乙烯-丙烯(EP)。该半导体外层周围可供以金属壳体及一外绝缘壳体。该半导体层由高分子材料组成,例如乙烯-共聚物,其具有一可导电的成分,如可导电的烟灰(soot)或碳烟粉(carbon black)。此种电缆以下将当做是一种电力电缆。
图1是用于转动电机的绕组的电缆的较佳实施例。图中的电缆1包含一携带电流的导电体2,该导电体2含有互相换位的非绝缘及绝缘线股。机电换位(transposed),经挤压的绝缘线股亦是可以的。这些线股可绞/或换位在复数层。该导电体周围有一半导体内层3,其接着由一均匀的固态绝缘层所包围。该绝缘层4完全不含有液体或气体绝缘材料。此一绝缘层4由一半导体外层5包围。在较佳实施例中当作绕组使用的电缆可配备金属壳体及外壳套(external sheath),但并不一定如此。为避免伴随在半导体外层5的感应电流与耗损,宜在位于由铁心板堆(sheet stack)至端部绕组的过渡地带的线圈端点切断。该切断被施行使得半导体外层5将被分割成沿着电缆分布的若干部分,该若干部分彼此完全或部分电绝缘。每一切断部分被连接至接地,因此半导体外层5在整个电缆长度内将保持或接近接地电位。此意指,在线圈端的固态绝缘绕组周围,这些可接触面,及这些使用若干时间之后变赃=脏的表面,相对于地仅具有可忽略的电位,且它们引起的电场可忽略。
为使转动电机最佳化,磁路的设计,关于凹槽及齿(teeth),具有决定性的重要性。如上述,凹槽应尽可能接近连接到线圈侧边的壳体。还希望的是每一径向方向上的这些齿尽可能地宽。这对于电机的耗损、磁化要求等最低化是很重要的。
欲达到上述的绕组的导电体,比如上述电缆,从若干观点来看,使磁心最佳化有许多可能性。以下所述,参照图2转动电机的定子内的一磁路,其显示本发明的电机的扇形/极心螺距6轴端示意图的实施例。具有转子极心的转子标示为7。通常,该定子由电板叠层的铁心(laminated core)组成,该电板叠层的铁心由连续的扇形板组成。从位于径向最外端的铁心背面8,若干齿9朝转子向内径向延伸。于该等齿之间有若干相对应的凹槽10。依据上述使用电缆11,允许用于高电压电机的凹槽深度可大于根据现有技术可能的深度。这些凹槽的截面朝转子逐渐变细,因为每一绕组层其朝往空气缝隙的电缆绝缘体的需要变得较低。从图中可明显看出,凹槽实质上由每一绕组层周围的圆形截面12组成且在这些层之间具有较窄部分13。此一凹槽截面积可当做一循环链状凹槽(cycle chain slot)。如图2的实施例,具有三种不同尺寸的电缆绝缘体的电缆被使用,这些电缆以三种相对应的尺寸长度14、15及16装设,也就是,实际上可获得一经修饰的循环链状凹槽。该图亦显示定子的齿可做成沿着整个凹槽的深度具有固定的径向宽度的形状。
在另一实施例,做为绕组使用的电缆可以是上述的常规电缆。通过拆除在适当位置的电缆金属壳及外壳,该半导体外毂即产生接地。
本发明提供许多的实施例,就绝缘体及半导体外层等而言视可获得的电缆尺寸而定。又,所谓的循环链状凹槽可被改良超过此所描述的。
如上述,磁路可位于转动电机的定子及/或转子内。然而,该磁路的设计将主要如上所述而与其是否在定子及/或转子内无关。
当缠绕时,优选使用绕组,其可为一多层、同心电缆绕组。此一绕组意味着在线圈端的交叉数目通过安置所有线圈在同一组群内,而该组群是在另一组群外部径向方向上而减至最小。此亦允许在不同凹槽的定子绕组的穿入(threading)及制造较为简单。因为本发明使用的电缆是相当容易挠曲的,该绕组可以一简单之穿入方式(threadingoperation)获得,其中该可挠曲的电缆穿入在凹槽10内的开口12中。
电力变压器/电抗器(图3及图4)
图3是常规电力变压器/电抗器的绕组周围电场分布的简化及基本的示意图,其中17是一绕组,18是一铁心以及19代表等电位线,也就是,在这样的同一条线上的电场是相等。
电位的分配决定绝缘系统的组成,因为绕组的相邻圈之间及绕组每一圈与地之间具有足够的绝缘体是必须的。该图显示绕组的上端倾向于最高绝缘负载。绕组相对于铁心的设计及位置实质上是由分布于铁心视窗上的电场分配决定。
可使用于本发明的干燥电力变压器/电抗器的绕组内的电缆已借助图1说明。该电缆,如前述,基于特别目的,例如防止在变压器/电抗器其他区域过度电应变(electrical strains),其可配备额外的外层。从几何尺度的角度来看,这些电缆将有一介于2-3000平方毫米之间的导体面积及一介于20至250毫米之间的外部电缆。
以下本发明概述中所描述的电缆所制造的电力变压器/电抗器之绕组可使用于单向、三相及多相变压器/电抗器,而与铁心的形状无关。图4的实施例显示一个三相叠层铁心变压器。该铁心,按常规方式,包含有三铁心柱(core limbs)20、21及22以及支撑轭(retaining yoke)23与24。实施例中,这些铁心柱及支撑轭具有逐渐变细的截面积。
电缆形成的绕组同心地包围这些铁心柱。明显地,图4的实施例有三个同心绕组圈25、26及27。最内层的绕组圈25可代表初级绕组,其他两个绕组圈26与27可代表次级绕组。为使该图不过于繁复,这些绕组的连接线并未示出。其他该图所显示的,具有若干不同功能的间隔杆28及29被安装于这些绕组周围的某些点上。这些间隔杆可由绝缘材料制造以供给某一间隔于这些同心绕组圈之间以作为冷却、拉条(bracing)等之用。它们亦可由导电性材料形成以成为这些绕组的接地系统部分。
其它电缆设计
图5所例示变化的电缆,其元件标号与前述相同,仅加上了表征该实施例的标号a。在该实施例中,电缆包含若干导电体2a,它们借助于绝缘体4a互相隔开。换言之,该绝缘体4a做为个别相邻导电体2a之间的绝缘体及导电体2a与周围之间的绝缘体。不同的导电体2a可以不同方式装设,此使得整个电缆有不同的截面积形状。在图5所例示的实施例中导电体2a装设在一直线上,其造成一相当平坦的电缆截面积。由此可知,电缆的截面积形状可以有很大的变化。
在图5中,假设在相邻的导电体之间存在一小于相电压的电压。更明确地说,图5的这些导电体2a被假设为在绕组内形成不同转,此意味着这些相邻导电体之间的电压相当的低。
如前述,有一半导体外层5a位于绝缘体4a的外部,其由一固态绝缘材料形成。一半导体内层3a被装设于每一导电体2a的周围,即每一导电体具有一包围其本身的半导体内层3a。这一3a层依此将尽可能与其所包围之个别导电体有相同电位。
图6中的变型采用了与上述相同的元件标号,仅加入了该实施例所特有的标号b。再者,在此例中,有若干,更明确地三个,导电体2b。相电压被假设存在于这些导体之间,即一个比图5实施例的导电体2a之间的电压明显高得多的电压。图6有一半导体内层3b,于其内安装有导电体2b。然而,每一导电体2b本身进一步由更内层30包围,其具有对应于上述内层3b的特性。每一更内层30与包围更内层30的层3b之间具有绝缘材料,依此,层3b将成为属于导电体的半导体更内层30外部的等电位层,这些更内层30被连接至个别的导电体2b,其与该导电体有相同电位。
可能的修改
明显地,本发明并不局限于上述实施例。因此,本领域的技术人员将了解在不悖离本发明的技术思想的情况下,若干细节的修改或变化是可能的。例如,本发明并不仅限于上述例示说明的特定材料。功能上相等的材料可取代之。至于本发明绝缘系统的制造,较之挤压及喷雾,只要能使各类层之间密切接触,其他技术亦为可行。再者,可以装设额外的等电位层。例如,至少一半导体等电位层可被安装于内层与外层之间的绝缘体中。
Claims (36)
1.一种电磁装置,该电磁装置包含一个高压绕组,该高压绕组包括至少一个具有一个绝缘系统的导电体,其特征在于该绕组由一个可挠曲的高压电缆形成,并且该绕组电缆的绝缘系统包含一个由固态绝缘材料形成的电绝缘体(4),该绝缘体外部有一外层(5),此外层(5)的导电系数大于绝缘体的导电系数,使得该外层可通过接地或连接至一个较低的电位来使其电位相等,并实质上包围住由外层(5)内部的所述导电体(2)所造成的电场,该绝缘系统包含一个位于绝缘体(4)内部的内层(3),至少一个导电体(2)位于内层(3)的内部,并且该内层所具有的导电系数低于该导电体的导电系数,但足以使该内层的电位相等,并由此使该内层(3)外部电场相等,
所述内层(3)和外层(5)由一种具有导电性成分的高分子材料形成。
2.如权利要求1所述的电磁装置,其特征在于该内层及/或外层(3,5)包含半导体材料。
3.如权利要求1所述的电磁装置,其特征在于该内层(3)及/或外层(5)有一个电阻系数,该电阻系数在10-6Ωcm-100KΩcm范围内。
4.如权利要求3所述的电磁装置,其特征在于该电阻系数在10-3-1000Ωcm的范围内。
5.如权利要求4所述的电磁装置,其特征在于该电阻系数在1-500Ωcm的范围内。
6.如权利要求1所述的装置,其特征在于该内层(3)及/或外层(5)具有这样的电阻,该层的每米长度的电阻阻值为50μΩ至5MΩ。
7.如权利要求1所述的电磁装置,其特征在于该固态绝缘体(4)及该内层(3)及/或该外层(5)是由高分子材料形成的。
8.如权利要求1所述的装置,其特征在于该内层(3)及/或该外层(5)以及该固态绝缘体(4)实质上在整个界面彼此刚性连接。
9.如权利要求1所述的电磁装置,其特征于该内层(3)及/或该外层(5)以及该固态绝缘体(4)由实质上具有相同热膨胀系数的材料形成。
10.如权利要求1所述的电磁装置,其特征在于该固态绝缘体(4)是通过挤压形成的。
11.如权利要求10所述的电磁装置,其特征在于该内层(3)及/或外层(5)是通过与挤压该绝缘体(4)同时进行的挤压形成的。
12.如权利要求1所述的电磁装置,其特征在于电缆的所述至少一个导电体的面积是在2-3000mm2范围内,而电缆的外径是在20-250mm之间。
13.如权利要求1所述的电磁装置,其特征在于该内层(3)及/或外层(5)包含一个具有导电性成分的高分子材料。
14.如权利要求1所述的电磁装置,其特征在于该内层(3)与至少一个导电体(2)有电性接触。
15.如权利要求14所述的电磁装置,其特征在于所述至少一个导电体(2)包含数股,并且至少一股导电体(2)有至少一部分是单向绝缘的,且与内层(3)有电性接触。
16.如权利要求1所述的电磁装置,其特征在于内层(3b)内部有若干相互绝缘的导电体(2b)。
17.如权利要求16所述的电磁装置,其特征在于依据前述任何一项权利要求的一个内层(3a)被装设于该若干导电体的每一个的周围。
18.如权利要求16所述的电磁装置,其特征在于内层(3b)的内部包含包围该若干导电体(2b)的每一个的更内层(30),所述更内层(30)具有对应于内层的特性。
19.如权利要求1所述的电磁装置,其特征在于导电体(2)及其绝缘系统被设计用于高电压,所述高电压超过10KV。
20.如权利要求19所述的电磁装置,其特征在于所述高电压超过36KV。
21.如权利要求20所述的电磁装置,其特征在于所述高电压超过72.5KV。
22.如权利要求1所述的电磁装置,所述外层(5)被划分为数个部分,每个部分分别地接地或连接至一个低电位。
23.如权利要求1所述的电磁装置,其特征在于其由一转动电机组成。
24.如权利要求23所述的电磁装置,其特征在于其绕组被装设于电机的定子及/或转子内。
25.如权利要求23所述的电磁装置,其特征在于产生磁场的电路包含一或多个用于绕组(1)的具有凹槽(10)的磁心(8)。
26.如权利要求23所述的电磁装置,其特征在于外层(5)接地,该外层外部的电机电场在凹槽(10)及线圈端区域几近于零。
27.如权利要求23所述的电磁装置,其特征在于凹槽(10)形成若干圆柱体开口(12),这些开口由这些圆柱体开口之间的较窄部分(13)分隔。
28.如权利要求27所述的电磁装置,其特征在于凹槽(10)开口的截面积减少,它是由磁心的背面部分(8)算起的。
29.如权利要求28所述的电磁装置,其特征在于凹槽(10)的截面积连续地或不连续地减少。
30.如权利要求23所述的电磁装置,其特征在于它是由一个发电机、马达或同步补偿器组成的。
31.如权利要求30所述的电磁装置,其特征在于发电机是水力发电机或轮机发电机。
32.如权利要求23所述的电磁装置,其特征在于它直接连接至一个高电压电力网路,所述高电压适当地为至少36KV,不具备中间变压器。
33.如权利要求1所述的电磁装置,其特征在于它是由电力变压器/电抗器组成的。
34.如权利要求33所述的电磁装置,其特征在于它包含一个磁心。
35.如权利要求33所述的电磁装置,其特征在于它由空气包围,因此不具有磁心。
36.如权利要求33所述的电磁装置,它包含至少两个电流分离的绕组,其特征在于这些绕组(25-27)以同心圆方式缠绕。
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SE9700335A SE508556C2 (sv) | 1997-02-03 | 1997-02-03 | Krafttransformator/reaktor |
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1997
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