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首页> 外文会议>IEEE Power Engineering Society General Meeting >Back-up protection of distance relay second zone by directional overcurrent relays with combined curves
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Back-up protection of distance relay second zone by directional overcurrent relays with combined curves

机译：距离继电器第二区的备份保护与组合曲线的方向过电流继电器

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摘要

In this paper, a novel approach for simultaneous setting of distance and directional overcurrent relays is presented. When the line protection schemes are composed of distance relays and directional overcurrent relays the setting of the relays must be computed considering both relays. Separate relay computation would lead to loss of selectivity. If the second zone time setting is fixed, automatic determination of the settings could lead to a non-feasible situation, indicating the impossibility of finding a selective set of settings. Thus the second zone time must be manually changed until the optimization problem is feasible. In this method, the best setting for the second zone that assures selectivity could be larger than the classical setting, so, it could lead to the unfavorable timing of the second zone. In the proposed method, instead of changing the time of the second zone, the shape of the backup directional overcurrent relay would be changed adaptively with the fault location and current. The idea of reducing the overcurrent protection response times at higher fault currents is achieved using a universal protection device with a software platform that can facilitate designing time-current characteristic curves of different shapes, all in the same hardware. The simulation results indicate the effectiveness of the method.
机译：本文介绍了一种用于同时设置距离和定向过电流继电器的新方法。当线路保护方案由距离中继和方向过电流继电器组成时，必须考虑中继的距离来计算继电器的设置。单独的继电器计算会导致选择性丧失。如果第二区域时间设置是固定的，则自动确定设置可能导致不可行的情况，表明找不到选择性设置的不可能。因此，必须手动改变第二区时间，直到优化问题是可行的。在该方法中，确保选择性的第二区域的最佳设置可以大于经典设置，因此，它可能导致第二区域的不利定时。在所提出的方法中，代替改变第二区域的时间，备用方向过电流继电器的形状将自适应地改变故障位置和电流。使用具有软件平台的通用保护装置实现在更高的故障电流下降低过电流保护响应时间的想法，该软件平台可以促进设计不同形状的时间电流特性曲线，所有这些都在相同的硬件中。仿真结果表明该方法的有效性。

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