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首页> 外文期刊>Electric power systems research >On-line stator ground-fault location method for synchronous generators based on 100% stator low-frequency injection protection
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On-line stator ground-fault location method for synchronous generators based on 100% stator low-frequency injection protection

机译：基于100％定子低频注入保护的同步发电机在线定子接地故障定位方法

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Locating stator-winding ground faults accurately is a very difficult task, especially in high-impedance grounded generators. Through the conventional measurements of power plants, obtaining the precise location of these defects in on-line operating conditions is not possible, because the fault resistance is unknown. This paper presents a general algorithm for locating stator-winding ground faults in on-line operating conditions, based on the measurements provided by the 100% ground-fault low-frequency injection protection, and other available measurements. Some simplifications are applied to the general algorithm, and a simplified method is also presented for generators with especially low capacitance-to-ground, whose implementation in modern protective relays is more simple. The location through the general algorithm, and the simplified algorithms, has been validated by simulation and experimental tests, for several fault resistance values at different points of the stator winding. These algorithms assure an acceptable accuracy for a wide range of fault resistance values and locations, without the need of any additional equipment. (C) 2015 Elsevier B.V. All rights reserved.
机译：准确定位定子绕组接地故障是一项非常困难的任务，尤其是在高阻抗接地发电机中。通过发电厂的常规测量，由于故障电阻未知，因此无法在在线运行条件下获得这些缺陷的精确位置。本文基于100％接地故障低频注入保护提供的测量结果以及其他可用测量结果，提出了一种在线运行条件下定位定子绕组接地故障的通用算法。对通用算法进行了一些简化，并为接地电容特别低的发电机提出了一种简化方法，其在现代保护继电器中的实现更为简单。通过一般算法和简化算法的位置已通过仿真和实验测试得到了验证，针对定子绕组不同点的多个故障电阻值。这些算法可确保在广泛的故障电阻值和位置范围内达到可接受的精度，而无需任何其他设备。 （C）2015 Elsevier B.V.保留所有权利。

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