Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

High-voltage inverters are critical devices for AC motor speed control and are widely used in high-power, high-voltage motor speed regulation applications in industries such as lifting, metallurgy, oil, and power generation. However, 6kV high-voltage inverters often experience abnormal drive tripping faults during operation due to factors like grid fluctuations and load impacts, significantly affecting the safety and reliability of motor speed control systems.To ensure stable operation of high-v

How should a surge arrester with cracked or exploded porcelain housing be handled?Answer:Handling of Cracked Porcelain Housing: Under normal weather conditions, apply to the dispatcher to de-escalate and replace the damaged phase arrester with a qualified unit. If no spare parts are available, paint or epoxy resin may be applied to the crack to prevent moisture ingress, with replacement scheduled as soon as possible. During thunderstorms, avoid taking the arrester out of service if possible; def

1. What is accident handling? What are the common types of operations used in accident handling?Answer: Accident handling refers to a series of operational actions taken in response to an emergency that endangers personal, power grid, or equipment safety, or when a power grid or equipment accident occurs. The goal is to quickly rescue personnel, isolate faulty equipment, adjust operating modes, and restore normal operation as soon as possible.Common operation types include: test energizing, forc

1.Common Faults and Diagnostic Measures1.1 Transformer Oil Leakage1.1.1 Oil Leakage from Tank Weld SeamsFor oil leakage at flat joints, direct welding is applicable. For leakage at corners or joints reinforced with stiffeners, the exact leakage point is often difficult to locate, and re-leakage may occur after welding due to internal stress. For such cases, repair welding with an added iron plate is recommended: for two-surface joints, the iron plate can be cut into a spindle shape for welding;

Contradiction PointsIn automatic tracking arc suppression coils, the adjustment precision is high, the residual current is small, and the operation is close to the resonance point.In an automatic tracking arc suppression coil grounding system, two factors must be considered: Under normal operating conditions, the long-term voltage displacement of the neutral point should not exceed 15% of the system's nominal phase voltage; In the case of a ground fault, the grounding residual current should b

Distribution networks, characterized by their wide distribution, large number of equipment, and low insulation level, are prone to insulation accidents caused by overvoltage. This not only reduces the stability of the entire distribution system and the insulation performance of the lines but also has a significant adverse impact on the safe operation of the power grid and the healthy and sustainable development of the power industry.From a circuit perspective, apart from the power source, the po