Magnetic memory based fracture detection technology for steel core of tension clamps
TENG Yulin1, LÜ Yanting2, LI Jun2, XIE Jinpeng1
1. Gansu Electric Power Research Institute Technology Center Co., Ltd, Lanzhou 730070; 2. State Grid Gansu Electric Power Company Electric Power Science Research Institute, Lanzhou 730070
Abstract：This article introduces a magnetic memory based detection method for the internal steel core stress and fracture defects of compression type tension clamps for overhead transmission lines, which are prone to stress concentration and internal steel core fracture during compression construction. By conducting metal magnetic memory testing experiments on three situations: non fracture, partial fracture, and complete fracture of the internal steel core of the tension clamp, the relationship between the magnetic memory signal curve and the damage to the internal steel core of the tension clamp is studied, and the magnetic memory testing results are compared and analyzed using X-ray testing methods. The results show that magnetic memory detection technology can effectively detect the damage and defects of the steel core inside the compression area of the tension clamp. The magnitude of the magnetic leakage field in the tension clamp is related to the degree of internal steel core damage. The more severe the steel core damage, the greater the value of the magnetic leakage field signal detected by magnetic memory based detection method.
2024, Vol. 25 
