Condition assessment of conductors and ground wires of overhead lines using non-destructive testing based on magnetic flux measurements

Since 2010 the diagnosis of bimetallic conductor cores and ground wires of overhead transmission lines 35-500 kV was performed using the magnetic flux detection method. For past two years the above mentioned surveys were realized at twenty three crossings of 35-110 kV over different types of water obstacles. Magnetic nondestructive testing enables the diagnosis of local faults such as wire breaks and loss of metallic area due to corrosion wear. The paper deals with magnetic testing technology for technical condition assessment of ground wires and steel cores of bimetallic conductors. Method of residual bearing capacity (strength) evaluation for inspected objects on the basis of diagnostic information is proposed. The strength safety factor is treated as an appropriate parameter that may be…