Echo Knowledge

1.Basic Concept of “Single-Point Grounding” Single-point grounding refers to a configuration in which the main system host is connected to earth at one single point, while all remote devices—including cameras and other equipment—must remain electrically insulated from earth. Specifically, “single-po

1. Application of Condition Monitoring Technology in UHV Transmission Lines At 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

1.Introduction In response to climate change, extensive research and development efforts have been undertaken globally to develop various types of SF₆-free gas-insulated switchgear as alternatives to conventional SF₆-based equipment. On the other hand, SF₆-free gas-insulated switchgear has been in s

1. Introduction SF₆ is widely used in electric power transmission and distribution systems, such as gas-insulated switchgear (GIS), circuit breakers (CB), and medium-voltage (MV) load switches. It possesses unique electrical insulation and arc-quenching capabilities. However, SF₆ is also a potent gr

The world's first transformer was developed in 1876. It featured a very simple design and used air as its insulation medium. In 1885, engineers in Hungary successfully built the first modern transformer with a closed magnetic circuit and air insulation, marking the beginning of rapid development and

Cooling and Insulation of Dry-Type Transformers A dry-type transformer is a special type of power transformer characterized by the fact that its core and windings are not immersed in insulating oil. This raises a question: oil-immersed transformers rely on insulating oil for both cooling and insulat

Voltage is an important criterion in power quality testing. The quality of voltage determines whether the power system can operate safely and has a significant impact on the stability of the entire power grid system. Currently, voltage regulators are relatively common electrical equipment in power s

Long-Distance Power Line Distribution: Low Voltage and Large Voltage Fluctuations According to the "Technical Guidelines for Distribution Network Planning and Design" (Q/GDW 1738–2012), the supply radius of a 10 kV distribution line must meet the voltage quality requirements at the line’s end. In pr

When evaluating power quality, voltage is a critical influencing factor. Voltage quality is typically assessed by measuring voltage deviation, fluctuation, waveform distortion, and three-phase symmetry—with voltage deviation being the most important indicator. To ensure high voltage quality, voltage

1. Introduction In recent years, with the steady and rapid development of the national economy, electricity demand has grown significantly. In rural power grids, the continuous increase in load, combined with irrational distribution of local power sources and limited voltage regulation capabilities

1. Overview Mountain distribution networks are equipped with numerous small hydropower stations, most of which are run-of-river stations without regulation capacity. These stations are connected to the same line as electrical loads, bringing certain negative impacts on power grid operation. The most

Railway power systems primarily consist of automatic block signaling lines, through-feeder power lines, railway substations and distribution stations, and incoming power supply lines. They provide electricity to critical railway operations—including signaling, communications, rolling stock systems,