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

1. IntroductionA transformer operates based on the principle of electromagnetic induction. The main components of a transformer are the windings and the core. During operation, the windings serve as the path for electric current, while the core serves as the path for magnetic flux. When electrical energy is input to the primary winding, the alternating current creates an alternating magnetic field in the core (i.e., electrical energy is converted into magnetic field energy). Due to magnetic link

Intelligentization has become an important development direction for power systems. As a critical component of the power system, the stability and safety of 10 kV distribution network lines are vital to the overall operation of the power grid. The fully enclosed disconnector, as one of the key devices in distribution networks, plays a significant role; thus, achieving its intelligent control and optimized design is of great importance for enhancing the performance of distribution lines.This pape

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

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

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

Definition of Steady State StabilitySteady state stability is defined as the capability of an electric power system to sustain its initial operating condition following a small disturbance, or to converge to a state closely approximating the initial condition when the disturbance persists. This concept holds critical significance in power system planning and design, the development of specialized automatic control devices, the commissioning of new system components, and the adjustment of operati

Linear voltage regulators are mainly classified into two types: shunt voltage regulators and series voltage regulators. The key difference between them lies in the connection of the control element: in a shunt voltage regulator, the control element is connected in parallel with the load; in contrast, in a series voltage regulator, the control element is connected in series with the load. These two types of voltage regulator circuits operate on different principles and thus have their own advanta

What is an Electric Busbar?An electric busbar is a conductor or set of conductors designed to collect electrical power from incoming feeders and distribute it to outgoing feeders. Functionally, it serves as a junction where inflowing and outflowing currents converge, acting as a central hub for power aggregation and distribution.Outdoor Busbar InstallationsIn high-voltage (HV), extra-high-voltage (EHV), and outdoor medium-voltage (MV) systems, bare busbars and connectors are typically used, with

Variable frequency drives (VFDs) and soft starters are distinct types of motor starting devices, though their use of semiconductor components often causes confusion. While both enable safe starting and stopping of induction motors, they differ significantly in operational principles, functionality, and application advantages.VFDs regulate both voltage and frequency to control motor speed dynamically, suitable for variable-load scenarios. Soft starters, however, use voltage ramping to limit inrus

An automatic voltage regulator is employed to regulate voltage, converting fluctuating voltages into a constant one. Voltage fluctuations mainly stem from variations in the load on the supply system. Such voltage variations can damage the equipment within the power system. These fluctuations can be mitigated by installing voltage - control equipment at various locations, such as near transformers, generators, and feeders. Multiple voltage regulators are often placed throughout the power system t