CN104303239A - 用于绝缘系统的材料、绝缘系统、外电晕防护装置和电机 - Google Patents
用于绝缘系统的材料、绝缘系统、外电晕防护装置和电机 Download PDFInfo
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Abstract
高压绝缘系统通过使用能导电的PTFE织物简化并且能够更薄地构成,其中也改进了导热性。
Description
技术领域
本发明涉及一种用于绝缘系统的材料、一种绝缘系统、一种外电晕防护装置和一种电机。
背景技术
电势控制在旋转的机器中、例如在发电机或者高压马达中实现电压(电势差)的最小化,由此能够减少或者完全避免部分放电和/或电晕放电的出现。
在旋转的电机中,绝缘系统的可靠性对其运行安全性负有决定性的责任。绝缘系统具有如下任务:使电导体(导线、线圈、棒)相对于彼此或者相对于定子叠片铁芯或者周围环境持久地绝缘。外电势控制具有如下任务:实现在位于地电势上的定子叠片铁芯和主绝缘部的外侧之间的电接触。由此保证了:在绝缘部和叠片铁芯的边界层的区域中的空腔中不出现部分放电。
在此需要区别:
●用于发电机绕组棒的外电晕防护(AGS),所述发电机绕组棒根据单棒生产来制造(AGS-E),
●用于发电机绕组棒的外电晕防护(AGS),所述发电机绕组棒借助于GVPI工艺来制造(AGS-G)。
在定子绕组被完全浸渍的情况下(整体真空压力浸渍,GlobalVacuum Pressure Impregnation,GVPI),整个叠片铁芯与完整装入的绕组一起浸渍并且硬化。由此,绕组在叠片铁芯的槽中的粘附是牢固的,使得通过铜、铁和绝缘部的不同的膨胀系数在铜、绝缘部和铁之间产生高的热机械应力,所述热机械应力在一定数量的热循环之后(发电机的启动和停止)能够导致边界面裂开。为了防止裂口经受电势差并且防止在那里点燃的部分放电破坏绝缘部,使用外电势控制装置(外电晕防护,outer corona protection,OCP),所述外电势控制装置在图1中作为双层的、如用于借助于G-VPI处理的机器的电势控制装置那样的外电晕防护装置示出。在通过铜子导体40构成的引导电流的罗贝尔线棒之上施加由细云母带构成的绝缘的基础缠绕物70,所述基础缠绕物平滑并且增大薄的铜子导体40的棱边半径。在其之上缠绕含石墨的第一导电无纺织物带100,所述第一导电无纺织物带经由接触条带130在仅一个部位上与铜子导体40的高压电势连接。
在其之上,才缠绕由细云母玻璃构成的主绝缘部160。此时,第一导电无纺织物带100代替铜子导体形成高压电极。所述第一导电无纺织物带持久地与主绝缘部粘贴。在主绝缘部160上跟随着由根据现有技术的材料构成的内部的外电晕防护缠绕物110(导电的、柔韧的带、特别是Krempel公司的带)、最外部的分隔带190’和外部的外电晕防护缠绕物200。交织在最外部的分隔带190’中的外电晕防护带140连接内部的外电晕防护缠绕物110和外部的外电晕防护缠绕物200。
在发电机起动和停机时在铜导体组合件和绝缘部之间产生的热机械应力在一定运行时间之后会导致绝缘套管与导体局部脱离,而在所产生的间隙中不会点燃令人担心的部分放电。剥开的区域是无电势的,因为高压电势已被传输到牢固地粘在主绝缘部上的导电无纺织物上。在导体和绝缘部之间的高负荷的内部边界面上的这种IPS设计允许涡轮发电机的数十年长的峰值负荷运行,不会有明显的部分放电老化。
发明内容
因此,本发明的目的是解决在上文中所提到的问题。
所述目的通过根据权利要求1所述的绝缘材料、根据权利要求17所述的绝缘系统、根据权利要求20所述的外电晕防护装置和根据权利要求21所述的电机来实现。
在从属权利要求中列举了其它有利的措施,所述措施能够任意地彼此组合,以便实现其它的优点。
附图说明
附图示出:
图1示出根据现有技术的发电机绕组棒的外电势控制装置,
图2示出根据本发明的外电势控制装置,以及
图3示出发电机。
附图和描述仅为本发明的实施例。
具体实施方式
本发明在于:使用疏水性材料、特别是PTFE(特氟龙)作为绝缘部、特别是用于这样的高压绝缘系统,其中绝缘系统护以层的方式能导电地构成。
高压绝缘系统能够是如在图1中那样的较复杂的系统或者简单的系统。
本发明仅根据作为疏水性材料的一个实例的PTFE来阐述。
优选地,疏水性材料或者PTFE已经能导电地构成。PTFE因此是复合材料。
这在制造材料时优选尤其借助于混入能导电的材料、例如石墨来进行,例如在制造时借助于挤压来混入,其中然后优选制造纤维。
但是织物的、纤维的、非织造网布(Geleges)的或者膜片的或薄膜的后续的导电覆层也是可行的。
织物优选由具有能导电的绝缘材料、特别是PTFE的纤维形成。
该织物优选以带形的形式存在并且为了应用而缠绕到要绝缘的面上(见图2)。
同样能够使用打孔的带(以织物形式等)、打孔的膜片或者打孔的非织造网布(非织造网布如从纺织技术中已知),这就是说,将通孔引入到带中、织物中、膜片中(所述膜片已经是多孔的)。
也就是说,优选地,外电晕防护装置中的高压绝缘系统具有由PTFE构成的纤维或者织物,其中为了实现导电性在形成织物的结构之间优选也存在能导电的材料、优选石墨。
图2中的高压绝缘系统中的AGS优选具有由PTFE构成的织物,其中这构造为,使得织物具有孔,所述孔如在上文中一样能够根据所描述的方法来渗透。
除了省去外电晕防护带140和通过根据本发明的含PTFE的材料来更换云母片之外,根据图1的当前的AGS系统的原理上的构造和功能在此应保持不变。此外,优选能够放弃图2中的外电晕防护缠绕物200。
这得到下述优点:
●良好的可完全浸透性,因为其是多孔的织物进而能够在硬化之前施用。
●在浸渍之前和之后不改变的电阻,因为导电性源自纤维并且不像如在AGS带中那样源自颗粒。(它们由于在浸渍之后包裹颗粒的塑料基质相对于初始值而具有另一电阻值。)
根据本发明的AGS-G的目的是:
●简化的施用/成本降低
●通过较薄的替选方案减小双重AGS的层厚度。
用于根据本发明的AGS-G的方法途径是:
●通过使用分隔层减小层厚度,所述分隔层实现限定的机械脱耦,而不会产生电阻的改变。这应通过用疏水性织物类型代替双层的云母片来实现。这特别能够是特氟龙织物。构造以如下方式进行:
根据本发明通过使用由PTFE构成的能导电的织物190得到改进,因为这使“编入”外电晕防护带140(图1)不是必要的。这实现层厚度和生产费用的降低(图2)。
用于在GVPI工艺中使用的新型的外电势控制装置的根据本发明的结构实现一种绝缘系统,所述绝缘系统在特性方面相应于当前现有技术,但是具有如下优势:
●确定硬化之后的TE自由度
●在执行用于加速的热机械负荷的温度循环测试之后类似的损耗因数●在工作电压负荷下且在电压负荷提高时的类似的电气耐久性
●在工作电压负荷下且在电压负荷提高时在不同的温度循环中的人工老化后的类似的电气耐久性。
这些研究在具有如下设计的发电机绕组棒上执行:
●长度约为1.5m和尺寸为1cm×5cm的铝型材
●对于13.8kV的额定电压,云母的层数为8+1层IPS
●对于每个集合,发电机绕组棒的数量为6。
在此实现了将当前的AGS的大约450μm的层厚度降低到大约100μm的值。
图3示例性地示出作为电机的发电机。
根据图3,旋转机器装置、特别是发电机装置2沿着纵轴线3从涡轮机侧的端部区域6延伸至激励器侧的端部区域8。发电机装置2具有壳体10。在涡轮机侧的端部区域6中设置有冷却设备12。更确切地说,在为壳体11的一部分的冷却体头部14中设置有两个冷却器12和呈具有风扇毂20的风扇18形式的压缩机。风扇毂20置于转子22上,所述转子沿着纵轴线3延伸穿过发电机装置2。真正的发电机区域23设置为沿着纵轴线3的方向连接于冷却设备12。在该区域中,转子22由定子24在形成空气间隙26的情况下围绕。定子24具有带有涡轮机侧的定子绕组头部28A和带有激励器侧的定子绕组头部28B的定子绕组。在这两个定子绕组头部28A、28B之间设置有所谓的叠片铁芯30。类似于定子24,转子22具有涡轮机侧的转子绕组头部32A和激励器侧的转子绕组头部32B。
由于在涡轮发电机中普遍的高的功率密度,在发电机区域中需要对发电机装置2进行冷却。在此,定子绕组头部28A、28B以及转子绕组头部32A、32B具有尤其高的冷却需求。为了冷却发电机区域23,该发电机区域具有冷却系统34,所述冷却系统由冷却设备12供给冷却气体。冷却系统34具有多个冷却气体通道36A、D、48,冷却气体经由所述冷却气体通道在循环中引导。第一冷却气体通道36A在此沿着轴向方向延伸并且设置在定子24和壳体10之间。第二冷却通道36B由气隙26形成。其它的沿着轴向方向延伸的冷却气体通道36C引导穿过叠片铁芯30。为了冷却转子22,冷却气体通道36D引导穿过该转子。冷却气体流在发电机区域23中以及在冷却设备12中分别通过箭头来表示,其中虚线箭头表示冷的冷却气体的流动路径并且实线箭头表示经过加热的冷却气体(热气体)的流动路径。
为了冷却定子绕组头部28A、28B,来自于冷却器16的冷却气体流在涡轮机侧的端部区域6中划分开。一个子流用于冷却涡轮机侧的定子绕组头部28A并且另一子流经由冷却气体通道36A被转送到激励器侧的定子绕组头部28B并且再一次被划分。一部分用于冷却定子绕组头部28B并且从那儿作为热气体经由气隙26再次流回。另一部分被引导通过叠片铁芯30的冷却气体通道36C并且在涡轮机侧的端部区域6中作为热气体排出并且被输送给冷却器16。为了冷却转子绕组头部32A、32B,冷却气体不仅从涡轮机侧的端部区域6而且从激励器侧的端部区域8被导入到转子22的冷却气体通道36D中。冷却气体的子流流经相应的转子绕组头部32A、32B并且紧接着作为热气导入到气隙26中并且被输送给冷却器16。余下的子流在冷却气体通道36D中被继续引导穿过转子22,更确切地说,使得冷却气体从这两个转子绕组头部32A、32B向彼此流动并且大致在发电机区域23的中部区域38中被导入到气隙26中。
Claims (21)
1.一种能导电的绝缘材料,
所述绝缘材料具有疏水性的材料,特别是PTFE,特别是由其构成。
2.根据权利要求1所述的绝缘材料,
所述绝缘材料具有能导电的、疏水性的材料,特别是能导电的PTFE。
3.根据权利要求1或2中一项或两项所述的绝缘材料,
所述绝缘材料具有纤维。
4.根据权利要求3所述的绝缘材料,
其中所述纤维具有疏水性的、能导电的材料,特别是能导电的PTFE纤维,更特别是由其构成。
5.根据权利要求1至4中一项或多项所述的绝缘材料,
所述绝缘材料具有织物,特别是由纤维构成的织物,所述织物至少部分地、特别是完全地具有根据权利要求4所述的纤维。
6.根据权利要求1、2、3、4或5中一项或多项所述的绝缘材料,
所述绝缘材料具有由疏水性的、能导电的材料构成的织物(5),特别是由能导电的PTFE构成的织物。
7.根据权利要求1至5中一项或多项所述的绝缘材料,
所述绝缘材料是膜片。
8.根据权利要求1、2或3中一项或多项所述的绝缘材料,
所述绝缘材料是非织造网布(平铺织物)。
9.根据上述权利要求中一项或多项所述的绝缘材料,
所述绝缘材料形成带。
10.根据上述权利要求中一项或多项所述的绝缘材料,
所述绝缘材料被打孔。
11.根据上述权利要求中一项或多项所述的绝缘材料,
所述绝缘材料具有由能导电的、疏水性的材料构成的被打孔的带,特别是由能导电的PTFE构成的被打孔的带。
12.根据上述权利要求中一项或多项所述的绝缘材料,
其中能导电的材料被混入到所述疏水性的材料中、特别是PTFE中。
13.根据权利要求3至12中一项或多项所述的绝缘材料,
其中能导电的材料在所述纤维、所述非织造网布、所述膜片或者所述织物结构之间分布。
14.根据上述权利要求中一项或多项所述的绝缘材料,
其中所述疏水性的材料、所述PFTE、所述纤维、所述织物、所述膜片、所述非织造网布或者所述带由能导电的层覆层。
15.根据权利要求12、13或者14中一项或多项所述的绝缘材料,
其中所述能导电的材料是石墨。
16.根据权利要求17所述的绝缘系统,
所述绝缘系统具有孔,所述孔特别是能渗透的。
17.一种层状的能导电的绝缘系统、特别是高压系统,
所述绝缘系统具有疏水性的材料,特别是PTFE。
18.根据权利要求17所述的绝缘系统,
所述绝缘系统以带形的方式被缠绕。
19.根据权利要求17或18中一项或两项所述的绝缘系统,
其中含PTFE的材料设置在内部的外电晕防护缠绕物(110)和外部的外电晕防护材料(200)之间。
20.一种外电晕防护装置,
具有根据上述权利要求中一项或多项所述的绝缘材料或者绝缘系统,特别是由其构成。
21.一种电机,所述电机具有根据上述根据权利要求1至20中一项或多项所述的绝缘材料或者绝缘系统,所述电机特别是发电机。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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EP20120161149 EP2645373A1 (de) | 2012-03-26 | 2012-03-26 | Material für Isolationssystem, Isolationssystem, Außenglimmschutz und eine elektrische Maschine |
EP12161149.5 | 2012-03-26 | ||
PCT/EP2013/053310 WO2013143787A1 (de) | 2012-03-26 | 2013-02-20 | Material für isolationssystem, isolationssystem, aussenglimmschutz und eine elektrische maschine |
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CN104303239A true CN104303239A (zh) | 2015-01-21 |
CN104303239B CN104303239B (zh) | 2017-11-24 |
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US (2) | US20150041178A1 (zh) |
EP (3) | EP2645373A1 (zh) |
CN (1) | CN104303239B (zh) |
IN (1) | IN2014DN07431A (zh) |
WO (1) | WO2013143787A1 (zh) |
Cited By (1)
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CN106464057A (zh) * | 2014-05-12 | 2017-02-22 | 西门子公司 | 用于高压电机的电晕屏蔽系统、修复漆和制造方法 |
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EP3240150A1 (de) * | 2016-04-25 | 2017-11-01 | Siemens Aktiengesellschaft | Elektrische maschine sowie verfahren zum auseinanderbauen und herstellen der elektrischen maschine |
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- 2013-02-20 US US14/386,261 patent/US20150041178A1/en not_active Abandoned
- 2013-02-20 EP EP13707309.4A patent/EP2807657A1/de not_active Ceased
- 2013-02-20 IN IN7431DEN2014 patent/IN2014DN07431A/en unknown
- 2013-02-20 EP EP21176178.8A patent/EP3905279A1/de active Pending
- 2013-02-20 WO PCT/EP2013/053310 patent/WO2013143787A1/de active Application Filing
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EP0978926A1 (en) * | 1997-12-18 | 2000-02-09 | Mitsubishi Denki Kabushiki Kaisha | Stator coil for rotary electric machine |
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Also Published As
Publication number | Publication date |
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EP2807657A1 (de) | 2014-12-03 |
US10902972B2 (en) | 2021-01-26 |
WO2013143787A1 (de) | 2013-10-03 |
US20150041178A1 (en) | 2015-02-12 |
EP2645373A1 (de) | 2013-10-02 |
CN104303239B (zh) | 2017-11-24 |
US20180068757A1 (en) | 2018-03-08 |
IN2014DN07431A (zh) | 2015-04-24 |
EP3905279A1 (de) | 2021-11-03 |
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