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The transient of transformer voltage recovery after clearance of external faults has been considered to be the same with that of transformer switching-on without load. In fact, the transient during transformer voltage recovery has its own characteristic. Taking into account the constraint that a breaker opens at the fault zero-crossing current, this paper analyzes the transformer magnetic-electric transient during the entire period of external faults. The fault transferring residual flux is firstly presented... The transient of transformer voltage recovery after clearance of external faults has been considered to be the same with that of transformer switching-on without load. In fact, the transient during transformer voltage recovery has its own characteristic. Taking into account the constraint that a breaker opens at the fault zero-crossing current, this paper analyzes the transformer magnetic-electric transient during the entire period of external faults. The fault transferring residual flux is firstly presented and four variables influencing the transformer recovery inrush current are studied. Furthermore, The digital simulation results and dynamic simulation data indicate that transformer recovery inrush itself cannot result in mal-operation of differential protection. 长期以来,变压器区外故障切除后的电压恢复过程被认为与空载合闸一致,其实变压器在此 期间的电磁暂态过程有其自身的特点。文中考虑了断路器在电流过零时开断短路电流的约束条 件,分析了变压器从外部故障发生到被切除的电磁暂态全过程,提出了故障传递剩磁的概念,说明 了影响变压器外部故障切除后恢复性涌流的4个参数。在此基础上,以数字仿真和动模录波数据 分析说明恢复性涌流本身不会造成变压器差动保护误动。 After an external fault of transformer is cleared,the transient flux may enter into the saturation region,and a recovery inrush may be produced.At the same time,the aperiodic component in the fault current usually has a high value during the fault,so that the CT may also enter into the saturation region.Both of them may cause the maloperation of the differential protection.In this paper,the flux of the transformer is obtained by theoretical derivation,then models of transformer and CT are built for simulation,and... After an external fault of transformer is cleared,the transient flux may enter into the saturation region,and a recovery inrush may be produced.At the same time,the aperiodic component in the fault current usually has a high value during the fault,so that the CT may also enter into the saturation region.Both of them may cause the maloperation of the differential protection.In this paper,the flux of the transformer is obtained by theoretical derivation,then models of transformer and CT are built for simulation,and an experiment is done to prove the results.The factors that affect the inrush are analyzed.The influence on the inrush of the differential protection is investigated and the saturation of CT is studied as well.At last,considering the inrush and the saturation of CT together,the main cause of the maloperation is discussed. 变压器外部故障切除后,暂态磁通可能超过变压器铁心的饱和点,从而产生一定的恢复性涌流。同时,外部故障过程中电流可能有很大的非周期分量,使CT进入饱和区。这两方面因素均有可能使差动保护在故障切除后误动。该文首先对变压器磁链进行理论推导,然后建立变压器和CT模型进行仿真,并通过实验验证结果。进一步推导得出了影响恢复性涌流大小的因素,研究了各种状态下涌流对差动保护的影响以及CT饱和的作用。最后综合考虑涌流和CT饱和,分析保护误动的主要原因。
恢复性涌流
recovery inrush
Study of Transformer Recovery Inrush After Clearance of External Faults 变压器外部故障切除后恢复性涌流的研究 短句来源 Furthermore, The digital simulation results and dynamic simulation data indicate that transformer recovery inrush itself cannot result in mal-operation of differential protection. 在此基础上,以数字仿真和动模录波数据 分析说明恢复性涌流本身不会造成变压器差动保护误动。 短句来源 After an external fault of transformer is cleared,the transient flux may enter into the saturation region,and a recovery inrush may be produced. 变压器外部故障切除后,暂态磁通可能超过变压器铁心的饱和点,从而产生一定的恢复性涌流。 短句来源 “恢复性涌流”译为未确定词的双语例句
The factors that affect the inrush are analyzed. The influence on the inrush of the differential protection is investigated and the saturation of CT is studied as well. 进一步推导得出了影响恢复性涌流大小的因素,研究了各种状态下涌流对差动保护的影响以及CT饱和的作用。 短句来源 相似匹配句对
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