公开(公告)号：US07199988B2

公开(公告)日：2007-04-03

申请号：US10871035

申请日：2004-06-21

申请人： Hitoshi Komori ,  Hideki Shimizu ,  Kazuhifo Kobayashi ,  Yoshihiro Matsui

发明人： Hitoshi Komori ,  Hideki Shimizu ,  Kazuhifo Kobayashi ,  Yoshihiro Matsui

IPC分类号： H02H3/00 ,  H02H7/122 ,  H01F17/00

CPC分类号： H05B41/2851

摘要： An arrangement is made in a transformer such that voltages induced on the opposite sides of a mid-point 17 of a secondary winding 16 are unbalanced by an amount on the order of 5%. When a ground terminal 18 is not grounded while a mid-point of a load is grounded, a voltage VUE is developed between the mid-point 17 and a non-active line terminal 15 and is rectified to provide a rectified output which turns a transistor 28 on, causing a light emitting element 33L to emit light. The resulting light renders a light receiving element 33P conductive, whereby a relay 37 is operated to turn a switch 13 off. When a ground fault occurs on one side of the secondary winding 16 while the ground terminal 16 is not grounded, a ground fault detection circuit 38 fails to detect the ground fault, but the non-grounding protection circuit 30 detects the ground fault and turns the switch 13 off.

摘要翻译： 在变压器中进行布置，使得在次级绕组16的中点17的相对侧上感应的电压不平衡约5％的量。 当接地端子18在负载的中点接地时不接地时，在中点17和非有效线路端子15之间产生电压V UE，并将其整流为 提供使晶体管28导通的整流输出，使发光元件33L发光。 所得到的光使光接收元件33 P导通，由此操作继电器37以使开关13断开。 当接地端子16未接地时，在次级绕组16的一侧发生接地故障时，接地故障检测电路38无法检测到接地故障，而非接地保护电路30检测到接地故障， 开关13关闭。