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

Q:What are the Operating Sequence Rules for the Secondary Miniature Circuit Breaker and High-Voltage Power Supply During Voltage Transformer De-energizing and Energizing?A:For busbar voltage transformers, the principle for operating the secondary miniature circuit breaker during de-energizing and energizing is as follows: De-energizing:First, open the secondary miniature circuit breaker, then disconnect the high-voltage power supply of the voltage transformer (VT). Energizing:First, energize the

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

The construction quality of distribution boxes directly impacts the overall quality level of a project. As the construction unit responsible for electrical equipment installation, it is essential to carry out the finalization, procurement, and installation of distribution boxes in accordance with standards such as the Unified Standard for Construction Quality Acceptance of Building Engineering(GB50300-2001) and the Code for Construction Quality Acceptance of Building Electrical Engineering(GB503

1. Problems with Power Distribution Cabinets in Building Electrical Installation (1) Quality issues of the power distribution cabinets themselves. Non-standard grounding of power distribution cabinets: Some cabinets lack dedicated grounding terminals or neutral bar terminals, which compromises structural integrity and safety, increasing the risk of short circuits, fires, and posing serious threats to the entire building electrical system. Failure to reserve spare circuits according to industry

1. IntroductionBuilding electrical engineering is an indispensable component of modern construction projects. The installation of electrical riser lines and distribution boxes is of paramount importance to the integrity and functionality of the entire electrical system. The quality of riser line installation directly impacts the usability, safety, and operational efficiency of the entire building. Therefore, rigorous quality control measures for the construction of electrical riser lines and dis

【Abstract】 In urbanization construction, the power system is the most fundamental electrical facility and a critical energy source. To ensure the safety and stability of the power supply during the operation of the power system, it is essential to scientifically and rationally select the high and low voltage distribution cabinets in distribution rooms. This ensures the safety and reliability of the distribution cabinets' operation while making the configuration more scientific, economical, and r

The operational status of power equipment directly impacts the power supply quality of utility companies. Routine maintenance of power equipment can reduce the risk of failures; however, existing challenges in condition-based maintenance (CBM) still lead to significant consumption of human and material resources. By implementing CBM, utilities can gain real-time insights into equipment conditions, enabling immediate detection and repair of faults. This significantly improves power supply reliabi

The test site layout must be reasonable and organized. High-voltage testing equipment should be placed close to the test object, live parts must be isolated from each other, and remain within the clear line of sight of test personnel. Operational procedures must be rigorous and systematic. Unless otherwise specified, voltage must not be suddenly applied or removed during operation. In case of abnormal conditions, voltage increase must be stopped immediately, pressure rapidly reduced, power disc

1. Principles of Ultraviolet Imaging TechnologyUltraviolet (UV) imaging technology leverages corona discharge and other localized discharge phenomena, which occur when the local voltage stress on a live conductor exceeds a critical threshold, ionizing the surrounding air and generating corona. During power equipment operation, corona, flashover, or arcing often arise due to design flaws, manufacturing defects, improper installation, or inadequate maintenance. In such discharges, electrons in the

In modern power systems and materials science research, ice coating test chambers have become increasingly indispensable.These chambers simulate complex climatic conditions such as rain, snow, freezing rain, and ice formation, providing reliable data support for scientific research, production, and quality inspection.As energy transition progresses and power transmission networks expand, the diverse applications of ice coating test chambers are becoming ever more prominent.What Is an Ice Coating