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

How Residual Current Devices (RCDs) Work and Why They TripA residual current device (RCD), also known as a leakage circuit breaker, trips when it detects a current imbalance of 30mA or more between the live and neutral conductors. In older electrical circuits, or in installations where cables were not run through conduits, it can be extremely difficult to use RCDs effectively. Even if the system works initially, during damp or humid weather, the RCD may trip repeatedly. Identifying the exact cau

In daily life and industrial operations, we often encounter circuit breakers tripping. Common causes include faulty breakers themselves or leakage/short circuits in the load. However, some tripping incidents have unexpected origins.At a mine, an emergency backup power system consisted of a diesel generator (400V), which fed a mining transformer (10,000V–400V) to step up voltage and supply power to the underground shaft. One rainy day, the main grid power failed. To ensure safety underground, the

Classification of Circuit Breakers(1) Air Circuit Breaker (ACB)An air circuit breaker, also known as a molded frame or universal circuit breaker, houses all components within an insulated metal frame. It is typically open-type, allowing installation of various accessories, and facilitates easy replacement of contacts and parts. It is commonly used as the main power supply switch. Overcurrent trip units include electromagnetic, electronic, and intelligent types. The breaker provides four-stage pr

The magnitude of pressure drop directly affects the energy consumption of the unitIn hydrocracking units, most high-pressure heat exchangers are used in the recycle hydrogen circuit, where the pressure drop directly impacts the energy consumption of the recycle hydrogen compressor. For once-through hydrocracking units, the energy consumption of the recycle hydrogen compressor accounts for approximately 15%–30% of the total unit energy consumption. Therefore, the pressure drop across the high-pre

The 10kV high-voltage reactive power compensation device is an essential and indispensable component in modern power systems. By providing or absorbing reactive power, it effectively addresses issues such as low power factor, high line losses, and voltage fluctuations caused by reactive power demand, playing a key role in improving the economy, safety, and power quality of grid operation. High-voltage 10kV reactive power compensation is a critical device for ensuring safe and economical grid ope

With the rapid development of the power industry, smart substations are playing an increasingly critical role in power systems. Their power monitoring systems are key to ensuring the safe, stable, and efficient operation of the power grid. Traditional substation power monitoring systems can no longer meet the growing demands of electricity consumption or the construction standards of intelligent grids.Thanks to their advanced technological advantages, power monitoring systems in smart substation

Power monitoring systems undertake the core tasks of real-time grid monitoring, fault diagnosis, and operational optimization. Their security directly affects the stability and reliability of power systems. With the deepening application of technologies such as cloud computing, the Internet of Things (IoT), and big data in the power industry, information security risks for power monitoring systems are gradually increasing.These systems face multiple challenges, including advanced persistent thre

With the continuous advancement of intelligence and informatization in power systems, power monitoring systems have become the core hub for grid dispatching, equipment control, and data acquisition. However, increased openness and interconnectivity have exposed these systems to increasingly severe security threats—such as cyberattacks, data breaches, and unauthorized access. A failure in security protection could lead to abnormal grid operations or even large-scale blackouts. Therefore, establis

1.BackgroundWind power generation converts the kinetic energy of wind into mechanical energy, and then transforms that mechanical energy into electrical energy—this is wind power generation.The principle of wind power generation involves using wind to rotate wind turbine blades, which then drive a gearbox to increase rotational speed, thereby driving the generator to produce electricity.Under China’s growing energy demands, wind power generation continues to expand, and wind farm construction is

As the wind power industry rapidly evolves, power monitoring systems in wind farms have become a critical support for grid operations. However, with increasing levels of informatization and intelligence, cybersecurity threats are growing more severe—especially in critical infrastructure sectors, where requirements for cybersecurity are stricter than ever.1. Key Challenges Facing Wind Farm Power Monitoring Systems Growing Cybersecurity Threats:Malicious attacks such as viruses, trojans, and ranso