Detection method for inducing overvoltage and overcurrent in cable core corrective maintenance

Abstract

The invention discloses a detection method for inducing overvoltage and overcurrent in cable core corrective maintenance. The method comprises the steps of determining relevant parameters of cables and equivalent circuits of cable lumped parameters; determining the grounding mode of detected cables and measuring actual voltage and current of normally running cables; judging the laying mode of maintained cables and treatment all the laid segmented maintained cables; selecting the mutual inductance calculation formula according to the grounding mode of the detected cables and calculating mutual inductance; calculating the induced voltage and the induced current generated by the normally running cables to the maintained cables in the longitudinal direction of the cables according to the mutual inductance by utilizing the calculation formulas of the induced voltage and the induced current; superposing the induced voltage generated by the normally running cables to the detected cables in the longitudinal direction of the cables and obtaining the superposed result to serve as the induced voltage of the detected cables in the longitudinal direction; judging whether the induced voltage is the overvoltage or not, giving relevant maintenance advice to maintainers and preventing the generated induced overvoltage from possibly injuring bodies of the maintainers.

Description

technical field [0001] The invention belongs to the technical field of power cables, and in particular relates to a detection method for induced overvoltage and overcurrent during troubleshooting of cable cores. Background technique [0002] With the continuous and rapid growth of my country's GDP and the improvement of people's living standards year by year, the scale and construction standards of urban construction are also constantly improving. When overhead transmission lines are erected in cities, inevitable shortcomings are becoming more and more prominent. For example, The towers and foundations occupy a large area, the line corridors are wide, the corona noise of the wires is large, and a series of problems such as so-called visual pollution are unsightly. In short, they are extremely inconsistent with urban construction. At present, cables of 10kV and below in large and medium-sized cities across the country have basically been transformed into the ground. With the f...

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Problems solved by technology

[0002] With the continuous and rapid growth of my country's GDP and the improvement of people's living standards year by year, the scale and construction standards of urban construction are also constantly improving. When overhead transmission lines are erected in cities, inevitable shortcomings are becoming more and more prominent. For example, The towers and foundations occupy a large area, the line corridors are wide, the corona noise of the wires is large, and the unsightly appearance is a series of problems called visual pollution. In short, it is extremely inconsistent with urban construction

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