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| Research on the Electric Field Measurement Method for Voltage Inversion of Overhead Line |
| BAI Xiongxiong |
| China Railway Construction Electrification Bureau Group North Engineering Co. Ltd, Taiyuan, Shanxi 030000, China |
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Abstract Research purposes: The voltage detection of overhead transmission lines in the power system is mainly based on voltage transformers, while the traditional transformers have the disadvantages of large volume, difficulty in moving, need to be installed without power, and possible ferromagnetic resonance, which makes the voltage monitoring of high-voltage transmission lines in areas with inconvenient terrain more difficult. Based on the electromagnetic field mirror method, this paper establishes the electric field calculation model of 110 kV three-phase overhead transmission line, and studies its electric field distribution characteristics. Then the feasibility of electric field measurement for overhead line voltage inversion calculation is demonstrated and a voltage inversion algorithm based on electric field sensor array is put forward, which can measure the three-phase electric field of wire. The voltage inversion of the scaled overhead line model is realized.
Research conclusions: (1) Based on the electromagnetic field mirror method, the electric field calculation model of overhead line is established, and the electric field distribution characteristics of 110 kV three-phase overhead line are theoretically analyzed, and the results show that the field strength amplitude distribution of the ground below the overhead line is "bimodal". (2) Based on the research on the electric field distribution characteristics of 110 kV three-phase overhead lines, an overhead line voltage inversion algorithm based on three-phase electric field measurement is proposed, and theoretical analysis proves that by measuring the vertical three-phase electric field under the three-phase wire, the inversion calculation of the three-phase voltage of the overhead line can be carried out. (3)Based on the research of voltage inversion algorithm, a scaled model of 110 kV three-phase transmission line is built in the laboratory, and the accuracy of the algorithm is verified by experiments. The experimental results show that the amplitude error of the voltage inversion algorithm is within 3.31% and the phase angle error is within 2° for the established experimental model. (4) This research result can provide a theoretical basis for overhead line voltage monitoring.
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Received: 30 July 2021
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2023, Vol. 40 
