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首页> 外文会议>2016 IEEE Pulp, Paper amp; Forest Industries Conference >Selective high resistance grounding system for a cogeneration facility
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Selective high resistance grounding system for a cogeneration facility

机译：热电联产设施的选择性高阻接地系统

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The paper describes a selective high resistance grounding (HRG) system for large industrial facility with two in-plant generators in cogeneration mode and two utility transformers. In a 5-step coordination using sensitive ground fault non-directional and directional relays, ground fault throughout the distribution system are cleared with a maximum pickup setting of 6A, time delay of 0.25s. A major consideration for HRG systems is that the stray capacitance charging current of the system should be small (10-15A) to prevent ground fault damage. If the fault is left in place for some duration for a single line-to-ground fault, insulation stresses occur due to higher line to ground voltages on two un-faulted phases. The paper demonstrates that with selective high resistance grounding, both these concerns are mitigated. A selective HRG is a bridge between the classical concepts of HRG and LRG (low-resistance grounding). The modern advancements in ground sensors and protective relaying can selectively clear low levels of ground fault currents, which make selective HRG a reality.
机译：本文介绍了一种用于大型工业设施的选择性高阻接地（HRG）系统，该系统具有两个热电联产模式的厂内发电机和两个公用事业变压器。通过使用敏感的接地故障非定向继电器和定向继电器进行5步协调，清除配电系统中的接地故障，最​​大拾取设置为6A，延时为0.25s。 HRG系统的主要考虑因素是系统的杂散电容充电电流应较小（10-15A），以防止接地故障损坏。如果单个线对地故障将故障留在原处一段时间，则由于两个未故障相上的线对地电压较高，会产生绝缘应力。本文证明，通过选择高电阻接地，这两个问题都得到了缓解。选择性HRG是HRG和LRG（低电阻接地）的经典概念之间的桥梁。地面传感器和保护继电器的现代进步可以选择性地清除少量的接地故障电流，这使得选择性HRG成为现实。

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