In-depth Analysis of Discharge Causes​​Surface Contamination Ionization​o Mechanism: Contaminants (salt dust, chemical deposits) electrolyze in humid environments, forming conductive channels.o Critical Threshold: Leakage current surges when relative humidity >75% and contamination density >0.1mg/cm².​Water Droplet-Induced Electric Field Distortion​o Mechanism: Raindrops accumulate on shed edges, causing localized electric field strength to exceed limits (>3kV/cm), triggering coro

Insulators are specialized insulating components that serve a dual purpose in overhead transmission lines: supporting conductors and preventing current grounding. They are installed at connection points between utility poles/towers and conductors, and between substation structures and power lines. Based on dielectric materials, insulators fall into three categories: porcelain, glass, and composite. Analyzing common insulator failures and maintenance strategies aims to prevent insulation failure

01 Safety Mechanisms of High-Voltage Transmission Towers​​**▍ Electric Shock Risk and Insulation Measures**​High-voltage transmission towers stand tall through wind and rain, carrying the vital task of power transmission, bearing the warning "High Voltage - Danger." This naturally raises the question: if you touch these towers, will you actually get an electric shock? Especially under adverse weather conditions like rain or snow, what happens?In reality, we can start with the phenomenon of "high

The Important Role of InsulatorsOn high-voltage power lines, we often see strings of insulators. What exactly is their purpose? These insulators, like guardian deities on the high-voltage lines, play a crucial role in ensuring safety. Through them, we can guarantee smooth current transmission while preventing the current from causing damage to the surrounding environment and equipment.​The Installation Process of InsulatorsWhy are strings of insulators hung on high-voltage lines? And how exactly

Preparation Before Repair​​Safety Measures​Power off the VFD and verify capacitor discharge is complete (use a multimeter to check DC bus voltage is below 36V).Wear insulated gloves and safety goggles to prevent electric shock or component explosion.​Tool Preparation​Multimeter, oscilloscope, LCR meter (bridge meter), insulation tester, screwdrivers, soldering station, etc.​Fault Diagnosis​Check the fault code on the VFD display (e.g., Overcurrent (OC), Overvoltage (OV), Overheating (OH)).Recor

1 Introduction​Wind energy is a renewable energy source with significant development potential. In recent years, wind power technology has garnered extensive attention from scholars worldwide. As a key direction for wind power development, variable-speed constant-frequency (VSCF) technology employs the doubly-fed wind power system as an optimized solution. In this system, the generator’s stator windings connect directly to the grid, while VSCF control is achieved by regulating the frequenc

Application of Permanent Magnet Synchronous Motor (PMSM) Variable Frequency Speed Control in the Chemical Fiber and Glass Industries​In the 19th century, permanent magnets were used to create electric motors. Today, with the rapid advancement of electronic technology, Permanent Magnet Synchronous Motors (PMSMs) and frequency converters together form open-loop, high-speed, high-precision variable frequency speed control systems. These systems have been widely applied across various industrial sec

A Variable Frequency Drive (VFD) is a common electrical device used to regulate the speed and voltage of motors. However, we sometimes encounter the problem of frequent tripping of the VFD. This not only disrupts the normal operation of equipment but can also lead to production line shutdowns, causing unnecessary losses for the enterprise. So, how should we solve this problem?First, we need to understand the reasons behind frequent VFD tripping. Frequent tripping is usually caused by the followi

Overcurrent Fault​Overcurrent is one of the most frequent faults encountered during inverter operation. To better protect the inverter, multi-level protection against overcurrent is generally implemented. Based on the severity of the overcurrent, it can be categorized into the following situations: power module overcurrent, hardware overcurrent, and software overcurrent. Typically, power module overcurrent is the highest-level fault. The hardware overcurrent threshold is significantly lower than

A frequency converter is a device used to adjust the speed and voltage of an electric motor by changing the motor's supply frequency to achieve speed control. However, during operation, frequency converters generate some interference that can negatively impact other electronic equipment and the power grid. Therefore, it's necessary to adopt solutions to mitigate this interference.​Electromagnetic Interference (EMI):​​ When adjusting the motor's supply frequency, frequency converters generate hig