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

1. Application of Condition Monitoring Technology in UHV Transmission LinesAt present, the main characteristics of UHV (Ultra-High Voltage) transmission line condition monitoring technology in China are reflected in the following aspects: Comprehensiveness: In general, during the implementation of monitoring technology, supporting facilities and integrated systems are required to ensure effective monitoring performance; High value: UHV transmission line condition monitoring technology is a criti

Recently, the world’s first 550 kV perfluoroisobutyronitrile (C4F7N)-based eco-friendly gas-insulated transmission line, developed by a Chinese manufacturer specializing in environmentally friendly gas-insulated power transmission equipment, was officially commissioned at the 500 kV Rongsheng Substation in Anqing, Anhui Province. This milestone marks another major breakthrough for China in the field of eco-friendly power equipment.For decades, sulfur hexafluoride (SF₆) has been widely used in th

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

Transmission Line TypesTransmission lines are classified into short, medium, and long based on their length and operating voltage.Power Loss and Voltage DropAll transmission lines have some power loss and voltage drop while transmitting power.Voltage RegulationThis measures the change in voltage at the receiving end from no-load to full-load conditions.Electrical ParametersThe main electrical parameters of a transmission line are resistance, inductance, and capacitance.Performance of Transmissio

HVDC Transmission DefinitionHVDC transmission is the method of transmitting electricity in DC form over long distances using either submarine cables or overhead lines.Conversion and ComponentsThe hvdc transmission system uses rectifiers and inverters for converting AC to DC and vice versa, with components like smoothing reactors and harmonic filters to ensure stability and reduce interference.HVDC Transmission SystemWe know that AC power is generated in the generating station. This should first

Skin Effect DefinedSkin effect in transmission lines is the phenomenon where AC current concentrates near the conductor’s surface, increasing its effective resistance.Skin effect is defined as the tendency of an AC current to distribute unevenly over the cross-section of a conductor, such that the current density is highest near the surface of the skin of the conductor and decreases exponentially towards the core. This means that the inner part of the conductor carries less current than the oute

What is Long Transmission Line?Definition of Long Transmission LineA long transmission line is defined as a transmission line longer than 250 km (150 miles), which needs a different modeling approach.A long transmission line is defined as a transmission line with a length greater than 250 km (150 miles). Unlike short transmission lines and medium transmission lines, long transmission lines need detailed modeling of their distributed parameters along the entire length. This makes calculating the

Medium Transmission Line DefinitionA medium transmission line is defined as a transmission line with a length between 80 km (50 miles) and 250 km (150 miles).A medium transmission line is defined as a transmission line with an effective length more than 80 km (50 miles) but less than 250 km (150 miles). Unlike a short transmission line, the line charging current of a medium transmission line is appreciable and hence the shunt capacitance must be considered (this is also the case for long transmi

Short Transmission Line DefinitionA short transmission line is defined as a transmission line less than 80 km (50 miles) long or with a voltage less than 69 kV.A short transmission line is defined as a transmission line with an effective length less than 80 km (50 miles), or with a voltage less than 69 kV. Unlike medium transmission lines and long transmission lines, the line charging current is negligible, and hence the shunt capacitance can be ignored.For short length, the shunt capacitance of