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

1 Characteristics and Components of High-Voltage Transmission Lines1.1 Characteristics of High-Voltage Transmission LinesHigh-voltage transmission lines are characterized by their relatively low cost due to the smaller amount of information they require. They typically use two conductors, one connected to the positive pole and the other to the negative pole. DC transmission lines have durability and can transmit current over long distances. In some high-voltage transmission facilities in China,

An insulator is a special type of insulating component that serves the dual purpose of supporting conductors and preventing current from grounding in overhead transmission lines. It is widely used at the connection points between transmission towers and conductors, as well as between substation structures and power lines. Based on the dielectric material, insulators are classified into three types: porcelain, glass, and composite. Analyzing common insulator faults and preventive maintenance meas

Automatic Reclosing Scheme for Transmission SystemsThe automatic reclosing system is a series-connected network designed to reduce operating costs and enhance network reliability. Extra-high voltage (EHV) transmission lines are used to transmit large amounts of power, on the order of thousands of megawatts (MW), and therefore should not be interrupted at all costs. Although faults on these overhead lines are common, the power transmitted through them should not be interrupted for long periods du

1. Indicators Related to the Utilization Rate of Power Transmission TransformersThe utilization rate of power transmission transformers needs to consider both the cost of transmitting and distributing electrical energy and the utilization efficiency of the equipment itself. The core indicators mainly include three dimensions: load rate, load factor, and equipment life rate.1.1 Load RateIt refers to the ratio of the actual load at the moment of maximum load to the rated capacity of the transforme

1. Manifestations of Generator Set Transformer Failures1.1 Abnormal Temperature RiseAbnormal temperature rise directly reflects a transformer’s health and serves as a key fault - warning indicator. During operation, electromagnetic energy conversion causes iron and copper losses, which turn into heat. To ensure normal operation, transformers use heat - dissipation mechanisms like oil circulation and heat radiation to maintain internal temperature balance.Thermometers and online detecti

1 Basic Structure, Operating Characteristics and Special Requirements of Transformers for Wind Power Generation1.1 Basic Structure of Transformers(1) Core StructureTransformers for wind power generation adopt core materials with high magnetic permeability to reduce energy losses. In application, the core usually requires special treatment to adapt to the harsh environment of long - term high humidity and high salinity. Especially in offshore wind farms, the corrosion resistance of the core is pa

At 12:45 on August 4, 2022, a dispatching center received a report from a 100 MW photovoltaic power generation base. It was reported that the incoming line switchgear on the 35 kV low - voltage side of the main transformer at the collection station was on fire, and the protection action tripped. After receiving the notification, relevant personnel went to the site and carried out on - site accident investigation together with the operation technicians. Through on - site inspection, it was found

1 Significance of Selecting and Optimally Designing Wind Turbine Transformers in Wind FarmsAs wind power systems spread, more power transformers are integrated, boosting total equipment capacity and operating losses. Transformers, made mainly from costly silicon steel sheets, copper windings, and foils, are also tough to design. Thus, optimal design and scientific selection are needed to meet technical, national - standard, and user requirements.To ensure stable transformer operation, study thei

1. Brief Introduction to the Photovoltaic Power Generation ProcessThe operation process of photovoltaic power generation is as follows: First, individual solar panels are connected in series to form photovoltaic modules, and the modules are arranged in parallel through combiner boxes to form a photovoltaic array. Solar energy is converted into direct current (DC) by the photovoltaic array, and then converted into three-phase alternating current (AC) through a three-phase inverter (DC - AC). Subs

Summary of Issues Related to Distribution Network Grounding Resistance Threshold and CalculationIn the operation of the distribution network, the insufficient ability to identify the grounding resistance is a key issue affecting fault judgment. To reasonably set the threshold, multiple factors need to be comprehensively considered.I. Difficulties and Directions in Balancing ThresholdsThe operating conditions of the grounding resistance are extremely complex. The grounding media may include tree