基于相位定位装置的中压电缆终端头运行电压定位方法研究

为了在线获取中压电缆的运行电压相位,为局部放电检测提供相位信息,提供了一种定位中压电缆运行电压相位的装置和方法。利用自制的金属贴片传感器在电缆终端头处耦合电压,通过分压原理在示波器得到金属贴片传感器上的电压相位,再通过对获取电压相位信息的反推得到电缆运行电压相位。该相位定位装置主要由金属贴片传感器、示波器以及同轴电缆构成。首先通过对相位定位装置进行电路模型等效和理论推导,计算出相位定位装置测得的电压相位与实际运行电压相位之间的相角差。最后在10 kV电缆终端头上进行实测,论证该理论分析的正确性和该方法的可靠性。在实验过程中还探索了在中压三相电缆终端不同位置进行测试对电压相位偏移角的影响,找到了测试的最优位置。

Research on the location method of medium voltage cable terminal operating voltage

In order to obtain the operating voltage phase of MV cable online and to provide phase information for PD detection, an apparatus and a method for locating the voltage phase of MV cable are provided herein. Using the homemade metal patch sensor to obtain the coupling voltage from the cable termination. The oscilloscope will obtain a partial pressure signal the operating voltage phase will be forecasted by pushing back the voltage phase information which is obtained by oscilloscope. The voltage phase locating device consists of metal patch sensor, oscilloscope and coaxial cable. In this paper, the phase angle between the voltage phase measured by the phase locating device and the phase of the actual operating voltage is calculated by the equivalent and theoretical derivation of the circuit model of the phase locating device. Finally, the test was carried out on the 10kV cable terminal to demonstrate the correctness of the theoretical analysis and the reliability of the method. In the course of the experiment, it also explores the influence on the voltage phase shift angle when testing at different positions of medium voltage three-phase cable terminals. And find the best place to text.