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

Advantages and Disadvantages of Double-Busbar Configuration in SubstationsA substation with double-busbar configuration employs two sets of busbars. Each power source and each outgoing line is connected to both busbars via one circuit breaker and two disconnectors, allowing either busbar to serve as the working or standby busbar. The two busbars are interconnected through a bus tie circuit breaker (referred to as the bus coupler, QFL), as shown in the figure below.I. Advantages of Double Busbar

In power systems, high-voltage disconnectors in substations have suffered from aging infrastructure, severe corrosion, increasing defects, and insufficient current-carrying capacity of the main conductive circuit, significantly compromising power supply reliability. There is an urgent need to carry out technical retrofits on these long-in-service disconnectors. During such retrofits, to avoid interrupting customer power supply, the common practice is to place only the retrofit bay under maintena

Hitachi Energy recently announced it will supply State Grid Corporation of China’s Central China Branch with the world’s first 550 kV SF₆-free GIS. This groundbreaking innovation marks a significant milestone in grid decarbonization and contributes to China’s commitment to achieving carbon neutrality by 2060.State Grid Corporation of China is the world’s largest power grid operator, serving 88% of China’s territory and over 1.1 billion people. As a leader in the energy sector, State Grid activel

High-voltage disconnectors are extremely widely used, and therefore people pay great attention to potential problems that may arise with them. Among various faults, corrosion of high-voltage disconnectors is a major concern. In light of this situation, this article analyzes the composition of high-voltage disconnectors, types of corrosion, and faults caused by corrosion. It also investigates the causes of disconnector corrosion and studies theoretical foundations and practical techniques for cor

1. Significance of Enhancing Fault Handling for 220 kV Outgoing Circuit Breakers and Disconnectors220 kV transmission lines are highly efficient and energy-saving high-voltage power transmission systems that significantly benefit daily life. A fault in a circuit breaker can severely compromise the safety and reliability of the entire power grid. As critical components of high-voltage transmission systems, circuit breakers and disconnectors play essential roles in power flow control and fault pro

Rockwill Accelerates AI Innovation to Empower the Future of Automation and ElectrificationArtificial intelligence (AI) is reshaping industries at an unprecedented pace. As a global technology leader in electrification and automation, Rockwill is deeply integrating AI across its entire portfolio, actively advancing more than 100 AI initiatives that span both analytical AI and generative AI—accelerating the development of intelligent solutions for tomorrow.At a recent strategic launch event in Zhe

Causes of Heating in Disconnectors Incomplete closing: This significantly reduces the current-carrying cross-sectional area, leading to increased contact resistance. Loose fasteners or degraded springs: Corrosion or overheating of the blade or contact springs reduces spring pressure; improper operating force may also cause misalignment of contact surfaces. Poor contact closure: Results in oxidation and contamination of contact surfaces; contacts may also be damaged by arcing during operation, an

On November 9, a new type of circuit breaker for gas-insulated metal-enclosed switchgear—designated ZF27-800(L)/Y6300-80—successfully passed a national-level technical appraisal organized by the Chinese Society for Electrical Engineering (CSEE) in Beijing. Developed jointly by a leading Chinese manufacturer of gas-insulated metal-enclosed switchgear and multiple partner institutions, this world-first 800 kV, 80 kA circuit breaker, featuring full independent intellectual property rights, has achi

The operational status and reliability of equipment within substations directly affect the safety and stability of the power grid. Most substation equipment consists of metal components made from various materials such as pure copper, carbon steel, and stainless steel. During long-term operation, performance degradation of these metallic materials often leads to equipment failures, posing significant risks to the safe and stable operation of substations.Outdoor high-voltage disconnectors are a p

High-voltage disconnectors require operating mechanisms with fast response and high output torque. Most current motor-driven mechanisms rely on a series of reduction components, yet motor-operated mechanism control systems effectively meet these requirements.1. Overview of the Motor-Operated Mechanism Control System for High-Voltage Disconnectors1.1 Basic ConceptThe motor-operated mechanism control system primarily refers to a system that employs a dual-loop PID control strategy to regulate moto