ROGOWSKI COIL AND CURRENT MEASURING INSTRUMENT

PROBLEM TO BE SOLVED: To provide a Rogowski coil that has unevenness of an interlinkage cross-sectional area with an external magnetic field of a coil suppressed, and has a current measurement error reduced, and to provide a current measuring instrument that includes the Rogowski coil.SOLUTION: A Rogowski coil 1 comprises: a toroidal coil core 3 that is composed of a non-magnetic material; a coil 4 which is wound around the coil core 3 with one layer, includes series connected winding portions 4a and 4b, and in which one end of the winding portion 4a serves as a winding start end and one end of the winding portion 4b serves as a winding finish end; and an intermediate tap that is led out from a connection point of the winding portions 4a and 4b. The winding portions 4a and 4b are respectively formed in such a manner that a wound part consecutively spirally wound around the coil core 3 a plurality of times and a crossover part crossing between the adjacent wound parts in the circumferential direction of the coil core 3 on an inner circumferential side are alternately repeated over an entire circumference in the circumferential direction a plurality of times. The wound parts of the winding portions 4a and 4b are arrayed in the circumferential direction in order of the winding portions 4a and 4b, and are repeatedly arrayed the plurality of times.SELECTED DRAWING: Figure 3 【課題】巻線の外部磁界との鎖交断面積のばらつきが抑制され電流測定誤差が低減されたロゴスキーコイルおよびロゴスキーコイルを備えた電流測定器を提供すること。【解決手段】ロゴスキーコイル１は、非磁性体からなる円環形状の巻芯３と、巻芯３に１層で巻回され、直列に接続された巻線部分４ａ，４ｂを備えると共に、巻線部分４ａの一端部が巻き始め端部となり、巻線部分４ｂの一端が巻き終り端部となる巻線４と、巻線部分４ａ，４ｂ同士の接続点から引き出された中間タップとを備える。巻線部分４ａ，４ｂは、それぞれ、巻芯３に螺旋状に複数回連続して巻回された巻回部と巻芯３の周方向に隣接する巻回部間を巻芯３の内周側で渡る渡り線部とが周方向の全周にわたって複数回交互に繰り返されてなる。巻線部分４ａ，４ｂの巻回部は、当該順序で周方向に配列されると共に全周にわたって複数回繰り返して配列される。【選択図】図３