Cable sheath defect identification method, device and equipment and readable storage medium

Abstract

The invention discloses a cable sheath defect identification method, device and equipment and a readable storage medium. The method comprises the steps of obtaining a circuit diagram of a to-be-identified cable cross interconnection structure; determining an equivalent impedance parameter equation matched with the circuit diagram of the cable cross interconnection structure according to a preset circuit parameter mapping table; obtaining a resistance value of each grounding resistor of the cable cross interconnection structure, a main insulation admittance value of each phase, an operation current value and a sheath current value; according to the equivalent impedance parameter equation, the resistance value of each grounding resistor, the main insulation admittance value of each phase, the operation current value and the sheath current value, calculating an equivalent impedance value of the cable cross interconnection structure; and determining the defect condition of a metal sheath according to the equivalent impedance value. According to the invention, the equivalent impedance of the metal sheath is calculated by measuring the operation current value and the sheath current value, so that whether the metal sheath of the cable has defects or not is judged, and the sheath defect problem is quickly identified.

Description

technical field [0001] The present application relates to the field of power transmission, and more specifically, to a method, device, equipment and readable storage medium for identifying defects in a cable sheath. Background technique [0002] Power cables have been widely used to transmit electric energy in cities, and induced voltage in the sheath of high-voltage cables is a common phenomenon in power cables. Excessive sheath voltage not only affects the safety of people and related equipment, but more importantly, the sheath voltage generates sheath current, which not only causes energy loss and reduces transmission efficiency, but also increases the temperature of the cable, affecting the cable. Life, and affect the transmission capacity of the cable. [0003] In order to limit the induced voltage and sheath current in the cable sheath, the cable transmission line generally adopts the sheath cross interconnection grounding method. The sheath defect will destroy the c...

AI Technical Summary

Problems solved by technology

The sheath defect will destroy the cross interconnection structure of the sheath circuit, resulting in the loss of effective grounding of the metal sheath or the increase of the sheath current. Excessive sheath current will cause the temperature of the cable to rise, which will reduce the current carrying capacity of the cable and accelerate the aging of the cable. , affecting the service life of high voltage cables

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