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

1.Protects the GeneratorWhen asymmetric short circuits occur at the generator outlet or the unit bears unbalanced loads, the GCB can quickly isolate the fault to prevent generator damage. During unbalanced load operation, or internal/external asymmetric short circuits, twice the power frequency eddy current is induced on the rotor surface, causing additional heating in the rotor. Meanwhile, the alternating electromagnetic torque at twice the power frequency induces double-frequency vibration in

In power grid construction, we should focus on actual conditions and establish a grid layout suitable for our own needs. We need to minimize power loss in the grid, save social resource investment, and comprehensively improve China's economic benefits. Relevant power supply and electricity departments should also set work goals centered on effectively reducing power loss, respond to energy conservation calls, and build green social and economic benefits for China.1.Current Status of China's Powe

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

On October 16, a ±800 kV ultra-high-voltage (UHV) transmission project completed all its maintenance tasks and was fully re-energized. During this period, a regional power company successfully conducted the first-ever fully unmanned inspection of the GIS (Gas-Insulated Switchgear) room at a UHV converter station within this power system.As a key component of China’s “West-to-East Power Transmission” strategy, the ±800 kV UHV project has been in operation since 2016 and has delivered nearly 400 b

UHV (Ultra-High Voltage) substations are a critical component of power systems. To meet the fundamental requirements of power systems, the associated transmission lines must remain in good operational condition. During the operation of UHV substations, it is essential to properly implement the inter-bay jumper installation and construction techniques between structural frames to ensure rational interconnection among the frames, thereby fulfilling the basic operational needs of UHV substations an

A substation bay refers to a complete and independently operable assembly of electrical equipment within a substation. It can be regarded as a fundamental unit of the substation’s electrical system, typically comprising circuit breakers, disconnectors (isolators), earthing switches, instrumentation, protective relays, and other associated devices.The primary function of a substation bay is to receive electrical power from the power system into the substation and then deliver it to the required d

Pad-Mounted Substation (Box-Type Substation)Definition:A pad-mounted substation, also known as a prefabricated substation or pre-assembled substation, is a compact, factory-assembled power distribution unit that integrates high-voltage switchgear, a distribution transformer, and low-voltage distribution equipment according to a specific wiring scheme. It combines functions such as voltage step-down and low-voltage power distribution into a single unit housed in a fully enclosed, movable steel en

What Are the Differences Between Substations, Switching Stations, and Distribution Rooms?A substation is a power facility in the electric power system that transforms voltage levels, receives and distributes electrical energy, controls the direction of power flow, and adjusts voltage. It interconnects power grids of various voltage levels through its transformers. In specific applications—such as submarine power cables or long-distance transmission—some systems use high-voltage direct current (H

First, the installation of 10 kV high-voltage disconnect switches must meet the following requirements. The first step is to select an appropriate installation location, typically near the switchgear power supply in the power system to facilitate operation and maintenance. At the same time, sufficient space must be ensured at the installation site to accommodate equipment placement and wiring.Secondly, equipment safety must be fully considered—for example, lightning protection and explosion-proo

The 145 kV disconnector is a critical switching device in substation electrical systems. It is used in conjunction with high-voltage circuit breakers and plays an important role in power grid operation:First, it isolates the power source, separating equipment under maintenance from the power system to ensure personnel and equipment safety;Second, it enables switching operations to change the system operating mode;Third, it is used to interrupt small-current circuits and bypass (loop) currents.Re