Abstract
An energy acquisition system for the ground wire of an overhead transmission line can provide a continuous and stable power supply for an on-line monitoring device. Its key issue is how to obtain enough power. To solve this problem, an energy acquisition scheme based on the double-insulated ground wire of an overhead transmission line has been investigated in this study. Three energy acquisition schemes were proposed, equivalent circuit analysis models of the three energy acquisition schemes were established, and the maximum power acquired was theoretically analyzed. The energy acquisition power of the three energy acquisition schemes for different tower-type sizes was also analyzed. A simulation model was built in PSCAD. The effects of load impedance, length of energy acquisition wire, grounding resistance, and load current on the power acquired were analyzed. The research results of this paper provide theoretical guidance for choosing an energy acquisition scheme and for designing key parameters in practice.
Highlights
With the increasing dependence of society on electric energy, the reliability requirements of stable power grid operation are becoming ever more demanding, and a large number of on-line monitoring devices have been put into operation on transmission lines
References [27, 28] studied the use of electromagnetic induction energy acquisition technology on the ground wires of typical overhead transmission lines, proposed energy acquisition schemes on the OPGW (Optical Fiber Composite Overhead Ground Wire), and on segmented insulated ground wires, respectively, and proposed an energy equivalent calculation circuit
To obtain the maximum power from the energy acquisition device, this paper studies the influence of the spatial position relationship between the ground wire and the conductor, the load impedance, the length of energy acquisition wire, the grounding resistance, and the load current on the energy acquisition scheme
Summary
With the increasing dependence of society on electric energy, the reliability requirements of stable power grid operation are becoming ever more demanding, and a large number of on-line monitoring devices have been put into operation on transmission lines. An energy acquisition technology using the overhead ground wire can provide sustainable and stable electric energy and is the most promising means to solve the power supply problem for on-line transmission line monitoring devices. Reference [26] analyzed and calculated the induced voltage and induced current on the insulated ground wire of an overhead transmission line and simulated the power acquired from the ground wire. References [27, 28] studied the use of electromagnetic induction energy acquisition technology on the ground wires of typical overhead transmission lines, proposed energy acquisition schemes on the OPGW (Optical Fiber Composite Overhead Ground Wire), and on segmented insulated ground wires, respectively, and proposed an energy equivalent calculation circuit. Reference [31] compared energy acquisition schemes between the OPGW and a segmented insulated ground wire on a typical overhead transmission line. The effects of load impedance, length of energy acquisition wire, grounding resistance, and load current on the power acquired and the energy acquisition scheme were analyzed
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