CN101784902B - 电流传感器 - Google Patents

电流传感器 Download PDF

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Publication number
CN101784902B
CN101784902B CN200780100364.5A CN200780100364A CN101784902B CN 101784902 B CN101784902 B CN 101784902B CN 200780100364 A CN200780100364 A CN 200780100364A CN 101784902 B CN101784902 B CN 101784902B
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embodied
current sensor
current
sensor according
secondary winding
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CN101784902A (zh
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鲁德洛夫·齐默尔曼
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Siemens AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1671—Making multilayered or multicoloured articles with an insert
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/186—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using current transformers with a core consisting of two or more parts, e.g. clamp-on type

Abstract

本发明涉及一种用于一带电导体的电流传感器(20)，其中，所述传感器(20)具有至少一个铁磁铁心(12，22)、一二次绕组(13，23)和多个用于一负载电阻器的连接元件(14，24)或一负载电阻器(51)，其中，所述二次绕组(13，23)实施为位于一绝缘层(15)上的注塑件，所述绝缘层系被喷涂在所述铁磁铁心(12，22)上。

Description

电流传感器
技术领域
无
背景技术
电力工程中需要对电流和电压进行监测，由于它们的值都很高，因此多数情况下须通过一调节器将其转换为成比例的比较值，以便于普通的测量设备能对此进行检测和分析。
变电站和开关设备领域有所谓电流转换器，其中的穿心式电流互感器环形包围一带电导体，因而也被称作“环形铁心电流互感器”。这种电流转换器根据其电磁工作原理也可称为变压器的一种特殊形式。
载有待测电流的导体所构成的一次绕组被用铁磁材料制成的铁心包围，二次绕组围绕铁心运动，二次绕组的末端连接有一电阻器(所谓的负载电阻器)，在这个电阻器上又可测得与一次电流成比例的电压值。
在电子监测断路器中对这个值进行处理，以便为相连用电设备提供过载保护。
发明内容
然而，已知的环形铁心电流互感器在生产和安装方面成本较高，因而本发明的目的是研发出一种成本更低、更易于制造的功率传感器。
这个目的通过一种根据权利要求1所述的电流传感器而达成。
从属权利要求描述的是本发明的有利实施方式。
附图说明
下面参考附图所示的实施例对本发明进行详细说明，其中：
图1为一半壳的结构图；
图2为一由两个半壳构成的电流传感器的结构图；
图3为包围一带电导体的电流传感器，所述带电导体载有小电流；
图4为包围一带电导体的电流传感器，所述带电导体载有较大电流；以及
图5为负载电阻器的可行结构。
具体实施方式
图1显示的是一半壳11的结构图。这个环形或管状半壳是用多组分注射成型法制成，包括铁磁铁心12、二次绕组13和用于连接负载电阻器的一或两个连接元件14。
铁磁铁心12以铸模件形式插入注模中，或者由填充了磁粉的热塑性塑料材料构成，因而同样具有注射成型能力。
在接下来的注射成型过程中为铁心半壳11包覆一个外轮廓与所需绕组相配的绝缘层15，之后就可安装由导电塑料构成的二次绕组13，在这个步骤中也可安装视情况为金属件形式的相应连接元件14和用于连接半壳11、21的连接元件16。最后是通过进一步的注射成型过程来安装一外护套18。
图2为一由两个半壳11和21构成的电流传感器20的结构图。用参考符号11、12、13、14、15和18表示的部件与用参考符号21、22、23、24、25和28表示的部件相一致。半壳21可与半壳11相同，也可以用一凹口27代替插销16。
从图2中可以看出，上述半壳11和21也可与一弹性铰链29(特别是薄膜铰链)相连，从而可以作为一个整体进行制造。绕组13和23也可视情况通过铰链29进行运动。
在本发明的一种实施方式中，所述负载电阻器实施为与绕组13、23连为一体的一导电塑料线。导电塑料具有通电时体积增大这一特性，因而可以进一步设计例如对一机构进行直接操纵这样的可选方案。这种机构可以是用于切断电路的脱扣器，也可以是其他类型的机械式执行机构。
为了实现机械运动，有利的做法是将所述电流互感器的一个部分如图3和图4所示实施为双金属结构31、32，以便在包含负载电阻器在内的区域32发生小幅体积变化时，可以实现幅度较大的机械运动，借助这种机械运动又可根据捕鼠器原理将一预受力机构释放，以实现过载断路。图3显示的是通额定电流(I1)时的情况，图4显示的是过载电流(I2，其中，I2＞I1)时的情况。图4用虚线表示通额定电流(I1)时包含负载电阻器在内的区域32的位置。包含负载电阻器在内的区域32的运动则用Δ表示。
如图5所示，将负载电阻器51实施为波纹状是有利的，这样既可实现合适的电阻值，也可将导电塑料的体积增大特别有效地转化为偏移运动。
按本发明的设计将多组分注射成型技术和导电塑料结合起来使用，可以在技术和经济上带来多方面的优点。
注射成型法提供了多种成本较低且易于自动化的生产方案，这些方案特别是通过在完整产品的整体设计中采用机械元件而实现。

Claims (10)

1.一种用于一带电导体的电流传感器(20)，其特征在于，
所述传感器(20)包括至少一个铁磁铁心(12，22)、一个二次绕组(13，23)和一负载(51)，其中，所述二次绕组(13，23)实施为位于一第一绝缘层(15)上的注塑件，所述绝缘层是被注塑在所述铁磁铁心(12，22)上，
其中，所述负载(51)实施为导电塑料线，且与所述二次绕组(13，23)连为一体，
其中，所述传感器(20)具有至少一个包含或包围所述负载(51)的区域(31，32)，其中，所述传感器(20)设计为，当所述传感器的一导电部分发生由电流引起的体积变化时，所述至少一个区域(31，32)会发生运动。
2.根据权利要求1所述的电流传感器(20)，其中，所述传感器具有一第二绝缘层(18)，所述第二绝缘层实施为注塑件且覆盖所述二次绕组(13，23)。
3.根据权利要求1或2所述的电流传感器(20)，其中，所述传感器(20)具有两个半壳(11，21)，所述每个半壳具有至少一个铁磁铁心(12，22)。
4.根据权利要求3所述的电流传感器(20)，其中，所述两个半壳(11，21)的二次绕组(13，23)通过一实施为一注塑件的连接件(29)彼此机械相连。
5.根据权利要求3所述的电流传感器(20)，其中，所述半壳(11，21)通过一实施为一注塑件的连接件(29)彼此电气相连。
6.根据权利要求4或5所述的电流传感器(20)，其中，所述连接件(29)实施为薄膜铰链。
7.根据权利要求1或2所述的电流传感器(20)，其中，所述至少一个铁磁铁心(12，22)实施为铸模件。
8.根据权利要求1或2所述的电流传感器(20)，其中，所述至少一个铁磁铁心(12，22)实施为一注塑件，由填充了磁粉的热塑性塑料材料构成。
9.根据权利要求1或2所述的电流传感器(20)，其中，所述传感器(20)具有金属件形式的整合式连接元件(14，24)和/或用于所述一个或复数个半壳(11，21)的复数个连接元件(16，17)。
10.根据权利要求1或2所述的电流传感器(20)，其中，所述运动会使一预受力机构得到释放，以实现过载断路。
CN200780100364.5A 2007-08-27 2007-08-27 电流传感器 Expired - Fee Related CN101784902B (zh)

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PCT/EP2007/007493 WO2009026945A1 (de) 2007-08-27 2007-08-27 Stromsensor

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WO2009026945A1 (de) 2009-03-05
US8405381B2 (en) 2013-03-26
BRPI0721962A2 (pt) 2014-03-18
KR20100057848A (ko) 2010-06-01
CN101784902A (zh) 2010-07-21
EP2183605A1 (de) 2010-05-12
US20100308797A1 (en) 2010-12-09

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