A Decentralized Fault Detection Technique for Detecting Single Phase to Ground Faults in Power Distribution Systems With Resonant Grounding
A Decentralized Fault Detection Technique for Detecting Single Phase to Ground Faults in Power Distribution Systems With Resonant Grounding
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DOI：
10.1109/tpwrd.2018.2799181
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发表时间：
2018-01
影响因子：
4.4
通讯作者：
Md Abdul Barik;A. Gargoom;Md. Apel Mahmud;M. Haque;H. Al-Khalidi;Amanullah Maung Than Oo
中科院分区：
文献类型：
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作者：
Md Abdul Barik;A. Gargoom;Md. Apel Mahmud;M. Haque;H. Al-Khalidi;Amanullah Maung Than Oo
提出了一种适用于含谐振接地配电网的分散式故障检测技术。本文的目的是检测单相接地故障，并在故障发生的三个周期内识别出故障馈线。在该方法中，首先根据中性点电压位移进行故障检测。然后使用故障前和故障后电压(相对地)来识别故障相。最后，根据故障发生后零序电流初始暂态与故障相电压之间的关系，识别出故障馈线(以及长馈线的故障区)。利用一种称为数学形态学的信号处理工具来识别故障馈线。为了识别故障馈线，还需要知道故障发生时间，该时间是使用中性点电压的斜率估计的。该方案的主要特点是该技术只使用来自相应的电压互感器和电流互感器的电压和电流信号。因此，它不需要相同或不同馈线中的保护装置之间的通信来识别故障馈线。该技术还具有区分故障性质的能力，即故障是永久性的还是暂时性的。在IEEE测试系统和实际测试系统上，利用MatLab/SimPowerSystems对所提方案的有效性进行了测试。仿真结果表明，该方法能快速检测出谐振接地系统中的单相接地故障，并能识别出故障馈线。它还能够将故障与其他干扰区分开来。此外，它工作在不同的补偿水平以及不同的故障起始角度。
This paper presents a decentralized fault detection technique for power distribution systems with resonant grounding. The aim of this paper is to detect single phase to ground faults and identify the faulty feeder within three cycles of the fault occurrence. In the proposed technique, faults are first detected based on the neutral voltage displacement. The pre-fault and post-fault voltages (phase to ground) are then used to identify the faulty phase. Finally, the faulty feeder (as well as the faulty area of a long feeder) is identified from the relationship between the initial transient of the zero-sequence current and the faulty phase voltage just after the occurrence of faults. A signal processing tool called mathematical morphology is utilized to identify the faulty feeder. To identify the faulty feeder, it is also required to know the fault occurrence time that is estimated using the slope of the neutral voltage. The main feature of the proposed scheme is that this technique only uses voltage and current signals from the corresponding voltage transformers and current transformers. Therefore, it does not require communication among protection devices in the same or different feeders to identify the faulty feeder. The proposed technique also has the ability to distinguish the nature of faults, i.e., whether the faults are permanent or temporary. The effectiveness of the proposed scheme is tested, on an IEEE test system as well as on a practical test system, using MATLAB/SimPowerSystems. Simulation results show that the proposed technique can quickly detect the single phase to ground faults in a resonant grounding power distribution system and identify the faulty feeder. It is also capable of distinguishing faults from other disturbances. Moreover, it works under different compensation levels as well as for different fault inception angles.