The petrochemical industry has been one of the most important industries in the past half-century, closely related to human production and life. In the petrochemical industry, electrical equipment is widely used, including various high-voltage and low-voltage motors, which drive fans, compressors, pumps and other equipment. In addition, the system also contains a large number of high-power DC loads and nonlinear loads, such as frequency converters, UPS, rectifier devices, etc. These load types are complex and generate a large amount of harmonics, which further lead to increased losses of equipment such as motors and transformers, accelerate aging, and even cause power system faults . Therefore, there are very high requirements for the design and operational safety of the power supply system. Therefore, preventive monitoring of electrical systems in the petrochemical industry is a must for modern production.
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