Power cables are widely used in transmission and distribution systems. Due to the high capacitance of the power cable, it is difficult for existing high-voltage excitation to meet the diagnostic test requirements at the same time. This article presents a method of generating a short-time ac (STAC) voltage for power cable condition evaluations simultaneously. First, the circuit structure based on the principle of resonance is given. Then, an algorithm based on optimization is given to control the resonance process. By using this method, a variety of high-voltage waveforms are excited by low voltage. This method makes the resonance process controllable and produces multiple waveforms suitable for cable condition evaluations. Several examples of diagnosing the state of a power cable, such as the detection and location of partial discharge (PD), precise tests of PD inception voltage and PD extinction voltage, and a dielectric dissipation factor test were carried out in the laboratory. In addition, an in-field test of a medium-voltage cable was performed. All the results show that the proposed STAC can be used to evaluate cable conditions effectively and simultaneously.

中文翻译：

---

一种构建短时交流电压发生器来评估电缆状况的方法


电力电缆广泛应用于输配电系统中。由于电力电缆电容较大，现有的高压励磁很难同时满足诊断测试要求。本文提出了一种生成短时交流 (STAC) 电压以同时评估电力电缆状况的方法。首先给出基于谐振原理的电路结构。然后，给出了一种基于优化的算法来控制谐振过程。利用这种方法，可以用低电压激发出多种高电压波形。该方法使谐振过程可控并产生适合电缆状况评估的多个波形。在实验室中进行了局部放电（PD）的检测和定位、局部放电起始电压和局部放电熄灭电压的精确测试以及介电损耗因数测试等电力电缆状态诊断的多个实例。此外，还对中压电缆进行了现场测试。所有结果表明，所提出的 STAC 可以有效地同时评估电缆状况。