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

1 Overview of Power Transmission and Distribution Lines1.1 Key Characteristics of Power Transmission and Distribution Lines High Maintenance Difficulty: This is mainly due to the wide area covered by power transmission and distribution lines, the harsh terrain of the laying areas, and the impact of seasonal climate changes, all of which contribute to difficult maintenance. High Requirement for Operational Reliability: The reliable operation of power transmission and distribution lines is closely

1. Types of Faults on Power LinesPhase-to-Phase Faults: Three-phase short circuit Two-phase short circuitGround Faults: Single-phase to ground fault Two-phase to ground fault Three-phase to ground fault2. Definition of Relay Protection DevicesWhen an abnormality or fault occurs in a component of a power system, relay protection devices are those that can quickly and selectively isolate the faulty or abnormal component from the system, ensuring the continued normal operation of the remaining heal

1. OverviewA transmission line fault is a sudden power interruption caused by various factors. To restore supply and prevent recurrence, operators must first locate the fault point, identify the type, determine the cause, and implement repairs.The most common faults include: Lightning strikes Ice buildup (icing) Wind deviation (wind sway) Bird-related issues Pollution flashover External damageUnderstanding these faults and their prevention is critical for grid reliability.2. Lightning Strike Fau

Analysis of Transmission Line Fault HandlingAs a fundamental component of the power grid, transmission lines are widely distributed and numerous, often exposed to diverse geographical and climatic conditions, making them highly susceptible to faults. Common causes include overvoltage, pollution flashover, insulation damage, tree encroachment, and external damage. Line tripping is one of the most frequent faults in power plant and substation operations, with fault types including single-phase-to-

Oil Leakage at Welded JointsOil leakage at welded joints primarily stems from poor welding quality, such as incomplete or detached welds, and defects like pinholes and gas pores. Although oil-immersed transformers are initially coated with solder and paint during manufacturing, potentially masking these issues temporarily, the defects tend to surface during operation. Additionally, electromagnetic vibration can cause weld cracks, leading to oil leakage.To resolve such leaks, the first critical s

I. Methods for Cable Testing and Inspection: Insulation Resistance Test: Use an insulation resistance tester to measure the insulation resistance value of the cable. A high insulation resistance value indicates good insulation, while a low value may suggest insulation problems requiring further investigation. Voltage Withstand Test: Apply a high-voltage test using a high-voltage tester to verify whether the cable can withstand high voltage under its rated operating conditions. Under normal circu

Power transformer fault detection and repair typically require operation by experienced and qualified technical personnel. Below are some common steps for power transformer fault detection and maintenance:I. Check the transformer’s input and output voltage, current, temperature, and other parameters to ensure they are within normal ranges. Carefully read the transformer’s instruction manual to understand its rated voltage and current, temperature limits, and other special req

Low-voltage power distribution lines are widely used across various industries, and the distribution environments are complex and diverse. These lines are accessed not only by professionals but also frequently by non-specialists, significantly increasing the risk of faults. Improper design or installation can easily lead to electric shock (particularly indirect contact), damage to wiring, or even electrical fires.The grounding system is a critical component of low-voltage distribution networks&m

Comprehensive maintenance is crucial for ensuring the safe and stable operation of high-voltage power distribution systems. Key maintenance requirements include: First, utilizing operational maintenance to achieve SCADA system data monitoring and acquisition, ensuring that system operating parameters meet established constraints under normal conditions. Second, implementing maintenance to carry out Demand Side Management (DSM) and Load Management (LM), optimizing the load curve to prevent overlo

Fault PhenomenonA power distribution system fault occurred in a customer's server room, resulting in damage to some IT equipment and instruments. Upon receiving the feedback, our company's engineers immediately rushed to the site to inspect the power distribution system and analyze the cause of the fault.Fault InspectionThe server room uses a three-phase five-wire power supply system. Two three-phase input, three-phase output UPS units (without output isolation transformers) are operating in par