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

1.SF6 Electrical Equipment and the Common Problem of Oil Leakage in SF6 Density RelaysSF6 electrical equipment is now widely used in power utilities and industrial enterprises, significantly advancing the development of the power industry. The arc-quenching and insulating medium in such equipment is sulfur hexafluoride (SF6) gas, which must not leak. Any leakage compromises the reliable and safe operation of the equipment, making it essential to monitor the SF6 gas density. Currently, mechanical

The Global Energy Landscape Is Undergoing a Fundamental Transformation toward a "fully electrified society," characterized by widespread carbon-neutral energy and the electrification of industry, transportation, and residential loads.In today’s context of high copper prices, critical mineral conflicts, and congested AC power grids, Medium-Voltage Direct Current (MVDC) systems can overcome many limitations of traditional AC networks. MVDC significantly enhances transmission capacity and efficienc

Our 220 kV substation is located far from the urban center in a remote area, surrounded primarily by industrial zones such as Lanshan, Hebin, and Tasha Industrial Parks. Major high-load consumers in these zones—including silicon carbide, ferroalloy, and calcium carbide plants—account for approximately 83.87% of our bureau’s total load. The substation operates at voltage levels of 220 kV, 110 kV, and 35 kV.The 35 kV low-voltage side mainly supplies feeders to ferroalloy and silicon carbide plants

Besides ultra-high voltage AC substations, what we encounter more frequently are power transmission and distribution lines. Tall towers carry conductors that leap across mountains and seas, stretching into the distance before reaching cities and villages. This is also an interesting topic—today, let's explore transmission lines and their supporting towers.Power Transmission and DistributionFirst, let’s understand how electricity is delivered. The electric power industry primarily consists of fou

General Overview of Automatic Reclosing ModesTypically, automatic reclosing devices are categorized into four modes: single-phase reclosing, three-phase reclosing, composite reclosing, and disabled reclosing. The appropriate mode can be selected based on load requirements and system conditions.1. Single-Phase ReclosingMost 110kV and higher transmission lines employ three-phase single-shot reclosing. According to operational experience, over 70% of short-circuit faults in high-voltage overhead li

I. Management Regulations for Trenchless Construction of MPP Power ConduitsIn power engineering, cable installation often employs trenchless techniques such as "pulling pipe" or "pipe jacking" due to routing constraints, construction schedules, and other objective factors. While trenchless methods offer advantages like minimal traffic disruption and shorter construction periods, they also present safety and management challenges. This is because trenchless technology remains relatively new for p

Common Issues and Solutions for SPDs in Practical ApplicationsSurge Protective Devices (SPDs) are critical for protecting electrical systems from transient overvoltages. However, several common issues occur in real-world installations: Insufficient maximum continuous operating voltage (Uc): Uc is lower than the grid’s maximum possible voltage, leading to SPD overheating or failure. Voltage protection level (Up) exceeds equipment impulse withstand voltage (Uw): SPD cannot adequately protect sensi

MPP Power Conduit Selection: Key Factors and Practical GuidelinesWhen selecting MPP (Modified Polypropylene) power conduits, it is essential to consider multiple factors including application scenarios, performance requirements, construction conditions, budget, and long-term maintenance. Below is a detailed analysis:1. Application Scenarios and Use CasesVoltage Level and Cable Type High-voltage cables (above 10 kV):Choose MPP pipes with thicker walls and high compressive strength to prevent defo

Overvoltage Fault Analysis in Inverter Voltage DetectionThe inverter is the core of modern electric drive systems, enabling precise motor speed control. To ensure safe and stable operation, it continuously monitors key parameters—voltage, current, temperature, and frequency. This article analyzes overvoltage faults in inverter voltage detection circuits.Inverter overvoltage refers to the DC bus voltage exceeding a safe threshold, risking component damage and triggering protective shutdown. Under

1. What is Secondary Equipment Grounding?Secondary equipment grounding refers to connecting the secondary equipment (such as relay protection and computer monitoring systems) in power plants and substations to the earth via dedicated conductors. Simply put, it establishes an equipotential bonding network, which is then connected to the station’s main grounding grid at multiple points.2. Why Does Secondary Equipment Require Grounding?Normal power-frequency currents and voltages during primary equ