A method for predicting the discharge voltage of the combined air gap for helicopter live work

Abstract

The present invention relates to the live working technology of power transmission lines, and in particular to a method for predicting the combined air gap discharge voltage of helicopter live working. The air gap is defined as the second gap. Through the first calculation of the electrostatic field and the extraction of the electric field feature set, input the support vector classification machine for the first prediction of the discharge voltage, determine which gap will break down first and its discharge voltage value; perform the second calculation of the electrostatic field and the electric field according to the potential change after the breakdown Feature extraction, use the support vector classification machine to predict the discharge voltage twice, determine the discharge voltage value of the post-discharge gap; compare the discharge voltage values ​​of the two gaps of the first discharge and the latter discharge, and take the larger one as the discharge of the air gap of the helicopter live working combination voltage prediction. This method can replace the discharge test, save the test cost, and provide guidance for obtaining the minimum safe distance for helicopter live working.

Description

technical field [0001] The invention belongs to the technical field of live work on power transmission lines, and in particular relates to a method for predicting discharge voltage of a helicopter live work combined air gap. Background technique [0002] Live work is an important means of detection, maintenance and transformation of transmission lines. Helicopter live work can reduce the physical exertion of operators and improve work efficiency. It has become an important measure for the operation and maintenance of EHV / UHV transmission lines. At present, my country's UHV transmission projects have been widely put into operation, and it has become an important technical means to use helicopters to carry out live work and maintenance of UHV transmission lines. [0003] The platform operation method is a commonly used helicopter live working method. Generally, a working platform is installed on the belly of the helicopter, and the operator rides on the platform to directly co...

AI Technical Summary

Problems solved by technology

Due to the problems of high cost and long period of experimental research, some scholars have carried out research on the mechanism of air gap discharge combined with live work, and proposed some discharge voltage calculation methods, most of which are based on the Rizk model (“Effect of floating conducting objects on critical Switching impulseBreakdown of air insulation", IEEE Transactions on Power Delivery, Volume 10, Issue 3, 1995) based on appropriate improvements, because the Rizk model is based on the discharge mechanism and some simplified assumptions based on the typical gap. The obtained semi-empirical model has limited applicability to the calculation of combined gap discharge voltage under different electrode structures and gap arrangements and different operating conditions, and cannot meet the actual engineering application. It is difficult to realize the discharge voltage of the combined air gap of helicopter live working calculate

Images