DISCONNECTION DETECTION METHOD AND DISCONNECTION DETECTION DEVICE

• Main Authors: NONEN HIDEKI, IMAI NORIYUKI, FUKASAKU IZUMI, SATO TAKAHIRO, KATO AYANO
• Format: Patent
• Language: English; Japanese
• Published: 30.03.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

To provide a disconnection detection method and a disconnection detection device that can detect with high sensitivity that disconnection has occurred in a conductor.SOLUTION: A method for detecting disconnection of strands of a cable 10 having a conductor 11a composed of a stranded conductor obtained by twisting the plurality of strands, includes: making the cable 10 into a state of being bent in a U-shape, and performing a U-shape bending motion of periodically sliding one end of the cable 10 along a cable longitudinal direction of the one end with a predetermined stroke; measuring a resistance value of the conductor 11a, which changes in time series due to the U-shape bending motion; using a frequency corresponding to a cycle of the U-shape bending motion as an operating frequency, and extracting a resistance value fluctuation component of the operating frequency included in the time-series change in the resistance value of the conductor 11a; and detecting disconnection of the strands based on magnitude of the extracted resistance value fluctuation component of the operating frequency.SELECTED DRAWING: Figure 1 【課題】導体に断線が発生したことを高感度で検知可能な断線検知方法および断線検知装置を提供する。【解決手段】複数の素線を撚り合わせた撚線導体からなる導体１１ａを有するケーブル１０の素線の断線を検知する方法であって、ケーブル１０をＵ字状に屈曲した状態として、ケーブル１０の一端部を当該一端部のケーブル長手方向に沿って所定のストロークで周期的にスライド移動させるＵ字屈曲動作を行い、Ｕ字屈曲動作により時系列的に変化する導体１１ａの抵抗値を測定し、Ｕ字屈曲動作の周期に対応する周波数を動作周波数として、導体１１ａの抵抗値の時系列的な変化に含まれる動作周波数の抵抗値変動成分を抽出し、抽出した動作周波数の抵抗値変動成分の大きさに基づいて、素線の断線を検知する。【選択図】図１