Helicopter live working combination air gap discharge voltage prediction method

Abstract

The invention relates to a power transmission line live working technology and especially relates to a helicopter live working combination air gap discharge voltage prediction method. An air gap between a high voltage lead and a suspended conductor is defined as a first gap. The air gap between a suspended helicopter and a grounding body is defined as a second gap. The method is characterized by through a static electric field, calculating and extracting an electric field characteristic set for the first time, inputting to a support vector classifier and carrying out the primary prediction ofa discharge voltage, and determining which gap breaks first and a discharge voltage value; according to a potential change condition after breakdown, carrying out the secondary calculation of the static electric field and electric field characteristic extraction, using the support vector classifier to carry out the secondary prediction of the discharge voltage, and determining the discharge voltage value of an after-discharge gap; and comparing the discharge voltage values of the previous discharge gap and the after-discharge gap, and taking a higher value as the discharge voltage prediction value of a helicopter live working combination air gap. The method can be used to replace a discharge test, test cost is saved, and guidance can be provided for acquiring the minimum safe distance of 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, becaus

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