The invention discloses a S type grounding resistor, which comprises a bracket, supporting insulator, connecting rod and a combination of resistors, resistance combination comprises a plurality of resistors, resistor includes resistor multi piece welding end section, resistor is S, the supporting rod is arranged on the bracket, a combined resistor is arranged on the supporting rod, insulator installed in the two ends of the supporting rod. The S type resistor of the present invention adopts a plurality of S type resistors, and the ends of the resistor are connected in a conductive manner. The S type structure resistor width than the resistor W type structure is small, the same width S type resistor ratio resistor W type structure, which makes the resistor flow cross-section, in S type resistor under the same power of temperature rise is lower than the short time high current resistor the W type structure temperature. In addition, the plurality of sets of resistance plates are welded at the front and the rear and arranged in parallel with each other, the structure is reasonable, the heat dissipation effect is good, and the ash accumulation is not caused, and the utility model has the advantages of high pressure resistance and high temperature resistance during the operation of the high current.
【技术实现步骤摘要】
本专利技术涉及一种S型接地电阻器。
技术介绍
短时间大电流电阻器一般是指在10秒内通过高达100-1000A电流的电阻器。根据国家标准DL/T780-2001要求短时间大电流电阻器的温升不得超过760。C。而10kW系统要求短时间大电流电阻器的电阻值从几欧姆到几十欧姆,功率则达到几千千瓦,要使这么大功率的产品在持续时间10S内温升低是很难做到的。因此短时间大电流电阻器工作时必须需要充分考虑电阻器的散热,防止因散热不及时导致电阻器出现质量故障问题。此外,我国的配电网一般都采用中性点经电阻接地方式来减少单相接地故障,电力行业采用的接地电阻器一般都是采用金属片构成的电阻器,随着高压电阻器在电力和机电业的广泛应用,对高压电阻器的技术要求也越来越高。现有的一种短时间大电流电阻器由很多如图1所示的W型的电阻片首尾连接组成。由于W型电阻片的通流截面小,导致同等功率下的电阻器温升较高,容易烧坏电阻器。此外,在现有技术中,高压电阻器主要是采用由数片平板并在中间制有凸筋式金属电阻片,其相互间装设绝缘隔板按串联或并联电连接装在支撑连杆上,支撑连杆两端装绝缘子和电阻器连座组成,且大电流电阻器多是靠多个相互并联和串联。但受其构造所限,结构设计不合理,在实际运行中温升高,尤其在大电流瞬间冲击状态下能变红随之变形,导致电阻器短路,甚至出事故,存在不安全因素,使用受到限制。另外有一些金属电阻器一片片的金属片通过焊接,层层叠加组成的,上述结构制造复杂,电阻器不易散热,而且较密集的排列会造成积灰,容易影响电阻器的正常工作。因此,需要一种新的接地电阻器 ...
【技术保护点】
一种S型接地电阻器,其特征在于,包括支架、绝缘子、支撑连杆和组合电阻,所述组合电阻包括多组电阻器,所述电阻器包含多片首尾焊接的电阻片,所述电阻片的截面呈S型,所述支撑连杆设置在所述支架上,所述组合电阻设置在所述支撑连杆上,所述绝缘子安装在所述支撑连杆的两端。
【技术特征摘要】
1.一种S型接地电阻器,其特征在于,包括支架、绝缘子、支撑连杆和组合电阻,所述组合电阻包括多组电阻器,所述电阻器包含多片首尾焊接的电阻片,所述电阻片的截面呈S型,所述支撑连杆设置在所述支架上,所述组合电阻设置在所述支撑连杆上,所述绝缘子安装在所述支撑连杆的两端。
2.根据权利要求1所述的S型接地电阻器,其特征在于,所述电阻片的两端分别设置有连接孔。
3.根据权利要求2所述的...
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