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

Characteristics and Detection Devices for Single-Phase Ground Faults1. Characteristics of Single-Phase Ground FaultsCentral Alarm Signals:The warning bell rings, and the indicator lamp labeled “Ground Fault on [X] kV Bus Section [Y]” illuminates. In systems with a Petersen coil (arc suppression coil) grounding the neutral point, the “Petersen Coil Operated” indicator also lights up.Insulation Monitoring Voltmeter Indications:The voltage of the faulted phase decreases (in

On May 7, China's first large-scale integrated wind-solar-thermal-storage comprehensive energy base UHV transmission project—the Longdong~Shandong ±800kV UHV DC transmission project—was officially energized and put into operation. The project has an annual transmission capacity exceeding 36 billion kilowatt-hours, with new energy sources accounting for more than 50% of the total. After commissioning, it will reduce carbon dioxide emissions by approximately 14.9 million tons annually, contributin

The Daquan Line has a large power load, with numerous and scattered load points along the section. Each load point has a small capacity, with an average of one load point every 2-3 km, so two 10 kV power through lines should be adopted for power supply. High-speed railways use two lines for power supply: primary through line and comprehensive through line. The power sources of the two through lines are taken from the dedicated bus sections fed by the voltage regulators installed in each power di

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

In order to actively respond to the development requirements of the power industry, our company has intensified its investigation into grid construction faults in a certain area and provided operation and maintenance support for DC UHV transmission and transformation projects in high-altitude regions by installing and optimizing UHV transmission equipment design schemes. The total land area of the construction site is 2,541.22 m², with a net land area of 2,539.22 m². The geological strata at the

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

Our 220 kV substation is located far from the urban center in a remote area, surrounded primarily by industrial zones such as Lanshan, Hebin, and Tasha Industrial Parks. Major high-load consumers in these zones—including silicon carbide, ferroalloy, and calcium carbide plants—account for approximately 83.87% of our bureau’s total load. The substation operates at voltage levels of 220 kV, 110 kV, and 35 kV.The 35 kV low-voltage side mainly supplies feeders to ferroalloy and silicon carbide plants

Besides ultra-high voltage AC substations, what we encounter more frequently are power transmission and distribution lines. Tall towers carry conductors that leap across mountains and seas, stretching into the distance before reaching cities and villages. This is also an interesting topic—today, let's explore transmission lines and their supporting towers.Power Transmission and DistributionFirst, let’s understand how electricity is delivered. The electric power industry primarily consists of fou

Standards for Surge Arresters Used in Cable Auxiliary Equipment GB/T 2900.12-2008 Electrotechnical Terminology – Surge Arresters, Low-Voltage Surge Protective Devices, and ComponentsThis standard defines specialized terminology for surge arresters, low-voltage surge protective devices, and their functional components. It is primarily intended for use in drafting standards, writing technical documents, translating professional manuals, textbooks, journals, and publications. GB/T 11032-2020 Metal-

Long-distance protection of high-voltage transmission lines primarily relies on technologies such as differential protection, distance protection, and automatic reclosing. Together, these technologies effectively ensure safe power transmission and stable grid operation.In the vast power transmission network, high-voltage transmission lines play a crucial role, acting as energy arteries that deliver electricity from power plants to homes and businesses. However, as transmission lines extend over