一种新的二次电缆屏蔽层接地方法

A Novel Grounding Scheme for Secondary Cable Shielding

提出一种新的二次电缆屏蔽层接地方法,即在开关场的一端经适当电阻接地,位于控制室的另一端直接接地。就不同电磁干扰耦合方式下二次电缆屏蔽层采用新型接地方法和传统接地方法时的抗干扰效果进行了分析比较,并对较为复杂的感性耦合方式进行了着重分析,发现采用新方法可以获得较好的电磁兼容效果,并可有效解决因地电流过大而可能烧毁屏蔽层的问题。

A novel grounding scheme for secondary cable shielding is put forward in this paper, in which one terminal in the switchyard is grounded via a suitable resistance, and the other in the control room is directly grounded. The electromagnetic compatibility （EMC） effect of the novel grounding scheme is compared with that of the traditional grounding scheme under multiple electromagnetic interference （EMI） coupling modes. An EMC effect comparison of two schemes under the complicated EMI inductive coupling mode is emphasized, showing that a good EMC effect can be achieved by both schemes, but the shield burning due to the over-large earth current can only be avoided using the novel grounding scheme.