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

1.Blocking Principle of Ultra-High-Voltage Converter Valves1.1 Working Principle of Converter ValvesUltra-high-voltage (UHV) converter valves typically employ thyristor valves or insulated-gate bipolar transistor (IGBT) valves to convert alternating current (AC) to direct current (DC) and vice versa. Taking the thyristor valve as an example, it consists of multiple thyristors connected in series and parallel. By controlling the triggering (turn-on) and turn-off of thyristors, the valve regulates

In a certain region, after maintenance of ultra-high-voltage (UHV) transmission lines, the following issues were identified: existing drones lack sufficient performance to meet the current large-scale and extensive inspection and maintenance demands of UHV lines. In practical operations, drones exhibit inadequate endurance, limited image acquisition capability, and poor electromagnetic interference (EMI) resistance, which negatively impacts inspection effectiveness and prevents accurate identifi

I. IntroductionSubstations serve as critical hubs in power systems, responsible for transmitting electrical energy from power plants to end users. Busbars, as a key component of substations, play an essential role in power distribution and transmission. However, busbar voltage loss incidents occur from time to time, posing a serious threat to the safe and stable operation of power systems. Therefore, ensuring zero busbar voltage loss in substations has become a crucial issue in power system oper

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

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

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, also known as isolator switches or knife switches, feature a simple working principle and convenient operation. As commonly used high-voltage switching equipment, they significantly impact the operational safety of substations, demanding stringent reliability in practical applications. The remote online defect-elimination system for high-voltage disconnector contacts offers advantages such as ease of operation, low operating costs, and high stability, making it well-s

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

According to relevant regulations, high-voltage disconnectors are permitted to perform the following operations: Switching (opening/closing) normally operating potential transformers (PTs) and surge arresters; Switching the neutral grounding disconnector of a main transformer under normal operating conditions; Switching small-current loops to balance circulating currents.A high-voltage disconnector is an electrical component without arc-quenching capability. Therefore, it may only be operated wh

In the context of high-speed operation of power systems, the opening and closing mechanism of high-voltage disconnectors in substations faces challenges such as complex operational procedures, large workloads, and low operational efficiency. With the advancement of image recognition technologies and sensor innovations, modern intelligent substations now demand higher technical standards for monitoring the open/close positions of high-voltage disconnectors during infrastructure development.The in