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

Power transformers are core primary equipment in power systems that realize electrical energy transmission and voltage conversion. Through the principle of electromagnetic induction, they convert AC power of one voltage level to another or multiple voltage levels. In the transmission and distribution process, they play a critical role in "step-up transmission and step-down distribution," while in energy storage systems, they perform voltage step-up and step-down functions, ensuring efficient pow

1. Power Interruption Problems Caused by RCD False Tripping During Lightning StrikesA typical communication power supply circuit is shown in Figure 1. A residual current device (RCD) is installed at the power supply input terminal. The RCD primarily provides protection against electrical equipment leakage currents to ensure personal safety, while surge protective devices (SPDs) are installed on power supply branches to protect against lightning intrusions. When lightning strikes occur, the senso

An Automatic Circuit Recloser is a high-voltage switching device with built-in control (it inherently possesses fault current detection, operation sequence control, and execution functions without requiring additional relay protection or operating devices) and protective capabilities. It can automatically detect the current and voltage in its circuit, automatically interrupt fault currents according to inverse-time protection characteristics during faults, and perform multiple reclosures accordi

In the rational application of intelligent technologies, the integrated intelligent ring main unit in 10kV distribution automation construction is more conducive to improving the construction level of 10kV distribution automation and ensuring the stability of 10kV distribution automation construction.1 Research Background Integrated intelligent ring main unit.(1) The integrated intelligent ring main unit adopts more advanced technologies, including but not limited to network technology, communic

When the capacitive current of a generator is slightly large, a resistor must be added at the generator neutral point to avoid power-frequency overvoltage that could damage the motor insulation during a ground fault. The damping effect of this resistor reduces the overvoltage and limits the ground fault current. During a single-phase ground fault of the generator, the neutral-to-ground voltage equals the phase voltage, typically several kilovolts or even above 10 kV. Therefore, this resistor mus

Overview of Grounding TransformersA grounding transformer, commonly referred to as a "grounding transformer" or simply "grounding unit," can be classified into oil-immersed and dry-type based on the insulating medium, and into three-phase and single-phase based on the number of phases. The primary function of a grounding transformer is to provide an artificial neutral point for power systems whose transformers or generators lack a natural neutral (e.g., delta-connected systems). This artificial

With the continuous improvement of living standards in rural areas, household appliances and various types of production-oriented electrical equipment have been widely popularized. However, the development of power grids in some remote areas is relatively lagging behind, failing to meet the rapidly growing demand for electricity load. These areas are vast with sparse population, large power supply line radius, and commonly suffer from low terminal voltage, unstable voltage, failure to start moto

With local development and industrial transfer, more and more enterprises are investing and setting up factories in underdeveloped areas. However, due to the immature development of electricity load and incomplete supporting facilities such as distribution networks, the newly added load can only be connected to the existing rural power grid lines. The distribution network lines in rural areas are characterized by scattered load, small wire diameter, and excessively large power supply radius.Conn

1. OverviewMountain distribution networks are equipped with numerous small hydropower stations, most of which are run-of-river stations without regulation capacity. These stations are connected to the same line as electrical loads, bringing certain negative impacts on power grid operation. The most prominent issue among them is the voltage quality problem. During the wet season, small hydropower stations generate electricity to the grid, and the failure to achieve local power balance leads to el

Traditional switches have become increasingly inadequate for the operational demands of modern traction power supply systems. The emergence of high-voltage disconnectors has effectively filled this gap. High-voltage disconnector systems optimize the structure of conventional switches, broaden their applicability, and place greater emphasis on fine details, thereby enhancing the safety and reliability of power systems during actual operation. Therefore, it is essential to analyze and study the ap