Research On The Method Of Determining The HVDC Lines Of Corona Field Based On Corona Cage

The electromagnetic environment parameter caused by corona discharge of HVDC transmission lines is an important technical index that must be considered when constructing UHV/UHV DC transmission lines in China.The halo field strength of the high-voltage DC split wire as a very basic parameter of the corona effect has not been systematically studied.Therefore,in order to optimize and fine-tune the electromagnetic environment of UHV/UHVDC transmission lines,it is necessary to conduct in-depth research on the halo field strength.Corona cage is an effective method to study the corona effect of the wire,but the test method for the electric field synthesis of outdoor corona cage is still immature.Therefore,it is necessary to study a complete set of HVDC conductor test methods in a corona cage,which can prepare for a large number of stun field strength tests of HVDC conductors in the later stage,and save time and time for conducting research on DC transmission Reduce waste of money.In this thesis,based on the data obtained from the combined electric field measurement test of the corona cage HVDC transmission line,the related research on the synthetic electric field to determine the halo field strength will be carried out.First,this paper proposes a preprocessing method for the test data of the measured synthetic electric field in the corona cage,determines a single point determination criterion for the coarse error that is most suitable for the test data,and analyzes and summarizes a large number of synthetic electric fields.The specific processing steps of the test data,integrated processing of all the test data,make a good foundation for the next analysis and study of the law of halo field strength.Then,according to the synthetic electric field test data of the corona cage split wire obtained from the actual measurement,based on some shortcomings of the traditional double tangent method,a semi-logarithmic coordinate system based on the semi-logarithmic coordinate system of the ion current field was proposed.There are three improved methods for determining the stun field strength,such as the method for determining the stun field strength and the backward change method based on the maximum change of the ion current electric field.The corresponding judgment value of the stun field strength is obtained,and compared with the stun voltage value judged by the human ear on the spot,and the validity of the method is verified.