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首页> 外文期刊>IEEE Transactions on Energy Conversion >The Fault-Current-Based Protection Scheme and Location Algorithm for Stator Ground Fault of a Large Generator
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The Fault-Current-Based Protection Scheme and Location Algorithm for Stator Ground Fault of a Large Generator

机译：大型发电机定子接地故障的基于故障电流的保护方案和定位算法

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摘要

This paper presents a stator ground protection scheme based on the fault current flowing in the breakdown channel. It trips only if the fault current exceeds the fault current tolerance capacity of the generator. Otherwise, it will just emit alarm signals. Thereby, the unnecessary trip-out of large generator can be avoided. The stability of the power system and the generator security can then be ensured. To achieve the scheme, methods of calculating the fault current in real time are proposed for three common generator neutral grounding methods based on the zero-sequence equivalent circuits. In addition, a ground fault location algorithm is presented which can automatically identify the faulted coil in a large generator with multicircuit stator winding. It greatly reduces the workload of repair. An implementation scheme is given on the basis of the subharmonic injection protection device. Simulation results show the validity of the protection scheme and the accuracy of the fault location algorithm.
机译：本文提出了一种基于故障电流在故障通道中流动的定子接地保护方案。仅当故障电流超过发电机的故障电流承受能力时，它才会跳闸。否则，它只会发出警报信号。由此，可以避免大型发电机的不必要的跳闸。这样就可以确保电力系统的稳定性和发电机的安全性。为了实现该方案，针对零序等效电路，针对三种常见的发电机中性点接地方法，提出了实时计算故障电流的方法。此外，提出了一种接地故障定位算法，该算法可以自动识别具有多回路定子绕组的大型发电机中的故障线圈。大大减少了维修工作量。基于次谐波注入保护装置，给出了一种实现方案。仿真结果表明了该保护方案的有效性和故障定位算法的准确性。

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