高压电缆终端应力锥应力变化的现场测试分析

Field Measurement and Analysis of Stress Variation in Stress Cone of High Voltage Cable Terminal

为了研究运行状态高压电缆终端界面压力的变化规律,笔者对预制橡胶应力锥应力变化进行研究。根据所研究高压电缆终端的结构特点,提出了现场橡胶应力锥应力变化电测的实验方案。利用静态应变测试仪测量了初装时的应变,通过计算得到初装时应力锥受到的压力。利用动态应变测试仪测量了运行中的应变变化情况,通过计算得到运行状态下橡胶应力锥应力的变化规律,从而反映出界面压力的变化规律。研究表明,该实验方案是可行的,数据采集是可靠的;在运行状态下,橡胶应力锥应力的变化和电压有关,电压越高应力锥应力变化越大。

Investigating stress variation of prefabricated rubber stress cone is necessary for understanding interface pressure variation of high voltage cable terminal in operation. Therefore, a field measurement method is presented in this paper according to the structural features of the HV cable terminal in order to obtain the variation rule of cable terminal interface pressure. The initial strain is measured utilizing a static strain gauge to calculate the initial pressure on the stress cone. The strain variation is also measured adopting a dynamic strain gauge to calculate the stress variation rule in the rubber stress cone in operation for reflecting the interface pressure variation. The test results verify the feasibility and reliability of the measurement method, and indicate a positive voltage dependence of stress variation in the rubber stress cone of a high voltage cable terminal.