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

With local development and industrial transfer, more and more enterprises are investing and setting up factories in underdeveloped areas. However, due to the immature development of electricity load and incomplete supporting facilities such as distribution networks, the newly added load can only be connected to the existing rural power grid lines. The distribution network lines in rural areas are characterized by scattered load, small wire diameter, and excessively large power supply radius.Conn

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, station passenger handling, and maintenance facilities. As an integral part of the national power grid, railway power systems exhibit distinct characteristics of both electrical power engineering and

Recently, a Chinese generator circuit breaker manufacturer has successfully developed generator circuit breakers for 1,000MW hydropower and thermal power units, which have passed the group's appraisal and acceptance. Their comprehensive performance has reached the international leading level, filling the domestic gap. This is another major breakthrough following the group's mastery of the technology for large-capacity generator circuit breaker complete sets for 400MW, 600MW, and 800MW units, mar

1. OverviewMountain 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 prominent issue among them is the voltage quality problem. During the wet season, small hydropower stations generate electricity to the grid, and the failure to achieve local power balance leads to el

Recently, Chinese on-load tap changer (OLTC) manufacturers announced a major breakthrough: China’s first ±800 kV ultra-high-voltage (UHV) converter transformer vacuum OLTC with fully independent intellectual property rights has successfully completed all type tests. Its key technical specifications have reached internationally leading levels, marking a critical step toward full domestic control over the entire UHV converter transformer supply chain.As one of the core components in UHV DC transmi

1. IntroductionIn 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 in the main grid, has resulted in a considerable number of 10 kV long feeders—particularly in remote mountainous areas or regions with weak grid structures—whose supply radius exceeds national standard

I. Analysis of the Principle of Power System Voltage RegulatorsBefore analyzing the principle of power system voltage regulators, it is necessary to analyze the excitation regulator and draw conclusions through comparison. In practical application, the excitation regulator uses voltage deviation as a feedback quantity for adjustment, thereby keeping the generator terminal voltage within the standard range. However, this type of voltage regulator, especially during grid faults, requires a large a

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 regulation is generally required. Currently, the most widely used and effective method for voltage regulation involves adjusting the tap changer of power transformers.This paper primarily integrates

Recently, a ±550 kV DC GIS (Gas-Insulated Switchgear), jointly developed by a Chinese GIS manufacturer and multiple companies, successfully completed a 180-day outdoor long-term energized reliability test at the Xi’an High Voltage Apparatus Research Institute. This marks the first time in the industry that a next-generation ±550 kV DC GIS has passed such a long-term energized evaluation.The ±550 kV DC GIS had already undergone comprehensive performance verification tests at the Xi’an High Voltag

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 systems, capable of reasonably and scientifically controlling the entire process of high-voltage tests on electrical equipment, thereby continuously improving the feasibility of such tests.1. Requireme