期刊论文

Analysis and discussion on combination-type grounding scheme for large-sized generator

中文

电力自动化设备

1006-6047

2018

38

11

217-222

10.16081/j.issn.1006-6047.2018.11.032

本校为第一机构

为限制接地故障电流,同时方便应用定子接地保护,大型发电机上采用了一种折中的组合型接地方式：在接地变压器低压侧负载电阻两端并联一个电感。给出了组合型接地方式的等值电路;对组合型接地方式进行选型计算,原则是电阻电流等于补偿后的电容电流,并将故障电流限制在10～25 A范围内。将组合型接地方式和常规的高阻接地方式进行了对比,对比结果表明组合型接地方式的并联电感值越小,越能有效地限制接地故障电流,但是采用组合型接地方式后失谐度、阻尼率会减小,进而导致传递过电压、位移电压有所增大。希望分析及探讨有助于组合型接地方式的选型设计及推广应用。

In order to limit the grounding fault current and facilitate the application of stator grounding fault protection, a compromise combination-type grounding scheme is adopted for large-sized generators, which installs an inductor in parallel with the load resistor at the low voltage side of neutral grounding transformer. The equivalent circuit of combination-type grounding scheme is given. The design calculation of combination-type grounding scheme is carried out, and the design principle is that the resistance current should be equal to the comp...