| 零序电流互感器为一种线路故障电流监测器 |
| 添加时间：2019/11/26 15:20:30 浏览次数： |
| 零序电流互感器为一种线路故障电流监测器。一般只有一个铁芯与二次绕组,使用时，将一次三芯电缆穿过互感器的铁芯窗孔，二次通过引线接至专用的继电器，再由继电器的输出端接到信号装置或报警系统。在正常情况下，一次回路中三相电流基本平衡，其所产生合成磁通也近于零。 Zero sequence current transformer is a line fault current monitor. Generally, there is only one core and secondary winding. When in use, the primary three core cable shall pass through the core window hole of the transformer, and the secondary cable shall be connected to the special relay through the lead, and then the output end of the relay shall be connected to the signal device or alarm system. Under normal circumstances, the three-phase current in the primary circuit is basically balanced, and the resultant flux produced by it is also close to zero. 在互感器的二次绕组中不感生电流，当一次线路中发生单相接地等故障时，一次回路中产生不平衡电流（意即零序电流），在二次绕组中感生微小的电流使继电器动作，发生信号。这个使继电器动作的电流很小（mA级），称作二次电流或零序电流互感器的灵敏度（也可用一次最小动作电流表示），为主要动作指标。 There is no induced current in the secondary winding of the transformer. When a single-phase grounding fault occurs in the primary circuit, the unbalanced current (i.e. zero sequence current) will be generated in the primary circuit. A small current will be induced in the secondary winding to make the relay act and generate a signal. This makes the relay action current very small (MA level), which is called the sensitivity of secondary current or zero sequence current transformer (also can be expressed as the primary minimum action current), as the main action index. |
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