特高压输电线路耐张串倾角计算方法研究OA

The uplift of tension insulator strings in power transmission lines can lead to the accumulation of water and dirt on the skirts of vertically-hung insulators,thus,the insulating strength of the insulators is reduced.Meanwhile,the uplift of tension clamps can allow the water to enter the conduit through the gaps at the clamp exit,which may freeze at low temperatures causing the expansion and resulting in the damage to the tension clamps.Furthermore,the safe operation of the lines is affected.To avoid such phenomena,it is necessary to take countermeasures such as inverting the insulators and greasing the tension clamps.The accurate calculation of the inclination angle of the tension string and tension clamp is crucial for determining whether to take such measures or not.The accurate calculation of the inclination angle of ultra-high voltage tension insulator strings is discussed in this paper.The traditional method of vertical span and the simple method of supported beam for calculating the angle of inclination of the tension insulator string are listed.For ultra-high voltage lines,the traditional methods are not accurate enough due to oversimplification or insufficient consideration in the effects of the length and weight of the ultra-high voltage tension insulator strings.Based on the principle of simple supported beam moment balance,a novel method for calculating the inclination angle of the tension string and the reaction force at the hanging point is proposed in this paper,which is verified by the simulation of Ansys finite element.The results show that the new method is very close to the Ansys simulation,and almost identical as the height difference is small.Moreover,the accuracy requirements for the angle calculation of ultra-high voltage engineering tension strings and clamps are fully met.The novel method is also applicable to the situation where one side of the span is a tension string and the other side is a suspension string.Thereby,a wide range of applicability is indicated.