| 零序电流互感器的安装及运行要求 |
| 添加时间：2018/11/8 15:26:54 浏览次数： |
| 零序电流互感器是一种线路故障监测器，一般仅有一个铁芯和一个二次绕组。使用时，将一根三芯电缆穿过互感器环形铁芯，二次绕组通过引线接至专用的继电器，再由继电器的输出端接至信号装置或报警系统。 Zero-sequence current transformer is a kind of line fault monitor, which has only one core and one secondary winding. When in use, a three-core cable passes through the annular iron core of the transformer, the secondary winding is connected to the special relay through the lead wire, and then the output terminal of the relay is connected to the signal device or the alarm system. 零序电流互感器的安装，不应使构架或其他导磁体与互感器铁芯直接接触，或与其构成分磁回路。 The installation of zero sequence current transformer should not make the frame or other magnetic conductors directly contact with the core of the transformer or form a sub-magnetic circuit with it. 10kV进线装设零序过电流保护，保护整定值为20A，整定时间为：由供电部门变电站直接供电的取0.5s，由开闭站供电的取0.2s。母线联络开关不设零序保护。母线联络开关若有自投装置，应有进线零序电流保护，零序电流保护动作后闭锁。 Zero-sequence over-current protection is installed on 10kV feeder. The setting value of protection is 20A. The setting time is 0.5s for direct power supply from substation of power supply department and 0.2S for power supply from open and close station. Busbar tie switch does not have zero sequence protection. If the bus connection switch has self-switching device, it should be protected by zero-sequence current of the incoming line and blocked after zero-sequence current protection is operated. 出线有保护装置的开闭站，在各出线开关处加装外附零序电流互感器，装设零序电流限时速断保护装置。 In the open and close stations with protective devices, zero sequence current transformers and zero sequence current limited time and speed interruption protection devices are installed at the outlet switches. 运行中零序电流互感器应与高压配电装置巡视周期相同。巡视中发现报警信号，要及时拉路查找接地故障点，井予以排除。原则上单相接地故障线路运行时间不得超过2h，否则将会由于绝缘击穿引起相问短路故障。 The zero sequence current transformer in operation should be the same as the inspection cycle of high voltage distribution device. The alarm signal is found in the tour, and the ground fault points should be searched in time to be eliminated. In principle, the operation time of single-phase grounding fault line should not exceed 2 hours, otherwise it will cause inter-phase short circuit fault due to insulation breakdown. |
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