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首页> 外文期刊>Electric power systems research >Modeling the impact of GIC neutral blocking devices on distance protection relay operations for transmission lines
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Modeling the impact of GIC neutral blocking devices on distance protection relay operations for transmission lines

机译：建模GIC中性阻断装置对输电线路距离保护继电器操作的影响

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摘要

Geomagnetic Induced Current (GIC) blocking devices typically include a capacitor on the neutral grounding path of wye-configured transformers. This type of GIC blocking device was designed as an effective countermeasure to prevent possible damages caused on the power grid by geomagnetic storms, and by the slow-varying component of a high-altitude electromagnetic pulse (HEMP). The insertion of a capacitor in the transformer neutral impedes the establishment of GICs in lines terminated with wye-connected transformer windings. With the presence of a capacitively grounded neutral, however, it becomes important to evaluate that no adverse effects are introduced in the general grid operations. In this context, this study investigates the impact of GIC neutral blocking devices on the functionality of distance protection relays for different values of transformer neutral blocking capacitors, and at different transmission line voltages. This study was conducted with a real-time simulation platform, and the simulations were performed by introducing a phase-to-ground fault at different line locations, and by measuring the apparent impedance at the protection relay location. The results indicated that, for typical values of capacitance considered for GIC neutral blocking devices, the distance protection relay model operates properly, without requiring a modification of the relay settings.
机译：地磁感应电流（GIC）阻止设备通常在星形配置的变压器的中性点接地路径上包括一个电容器。这种类型的GIC阻止设备被设计为一种有效的对策，可以防止由于地磁风暴和高空电磁脉冲（HEMP）的缓慢变化分量对电网造成的可能损害。在变压器中性线中插入电容器会阻止在星形连接的变压器绕组终止的线路中建立GIC。但是，在存在电容性接地的零线的情况下，评估在一般的电网运行中没有引入不利影响就变得很重要。在这种情况下，本研究针对不同值的变压器中性闭锁电容器和不同传输线电压，研究了GIC中性闭锁设备对距离保护继电器功能的影响。这项研究是使用实时仿真平台进行的，通过在不同线路位置引入相接地故障并通过测量保护继电器位置的视在阻抗来进行仿真。结果表明，对于GIC中性闭锁装置考虑的典型电容值，距离保护继电器模型可以正常运行，而无需修改继电器设置。

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