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

Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?In substations, equipment such as power and distribution transformers, transmission lines, voltage transformers, current transformers, and disconnect switches all require grounding. Beyond grounding, we will now explore in depth why gravel and crushed stone are commonly used in substations. Though they appear ordinary, these stones play a critical safety and functional role.In substation grounding design—especially when multiple gr

Chinese reactor manufacturer successfully completed all tests in one go for the nation’s largest-capacity 750 kV, 140 Mvar stepped-controlled shunt reactor developed for the Turpan–Bazhou–Kuche II Circuit 750 kV transmission and transformation project. The successful completion of these tests marks a new breakthrough in the core manufacturing technology of 750 kV reactors by the Chinese manufacturer, pioneers a new field for 750 kV stepped-controlled shunt reactors in China, and lays a solid fou

I. CLAIMS A sealing structure for lead wires of contacts in an oil-filled SF6 gas density relay, characterized by comprising a relay housing (1) and a terminal base (2); the terminal base (2) comprising a terminal base housing (3), a terminal base seat (4), and conductive pins (5); the terminal base seat (4) being disposed inside the terminal base housing (3), the terminal base housing (3) being welded onto the surface of the relay housing (1); a central through-hole (6) being provided at the ce

Creepage in squirrel cage motors refers to the phenomenon where the rotor begins to rotate even though the motor is not receiving sufficient voltage to fully start or maintain rotation. This can happen under certain conditions, particularly when there is residual magnetism or when the motor is subjected to external forces that cause it to turn slightly. Here are the main causes of creepage in squirrel cage motors:Residual Magnetism Magnetic Fields: Even after the power supply is cut off, some re

The type of wire used for electrical connections between two buildings or houses, such as in a situation where power needs to be shared or distributed, typically depends on several factors including the distance between the buildings, the load requirements (current draw), the voltage level, and environmental conditions. Here are some common types of wires and cables that might be used:Aluminum WireAluminum wire is commonly used for overhead power lines due to its light weight and good conductivi

The process of charging the battery using the AC adapter is as followsConnecting devicePlug the AC adapter into the power outlet, making sure the connection is secure and stable. At this point, the AC adapter starts to obtain AC power from the grid.Connect the output of the AC adapter to the device that needs to be charged, usually through a specific charging interface or data cable.Ac adapter operationInput AC conversionThe circuit inside the AC adapter first rectifies the input AC power, conve

A one-way switch is the most basic type of switch that has only one input (often called the "normally on" or "normally closed" state) and one output. The working principle of the one-way switch is relatively simple, but it has a wide range of applications in various electrical and electronic devices. The following details the circuit working principle of the one-way switch:The basic structure of a one-way switchA one-way switch usually consists of the following parts: Contact: A metal part used

Electrical knowledge covers a broad set of theoretical and practical skills related to the basic principles of electricity, circuit design, operation and maintenance of power systems, and the working principles of electronic devices. Electrical knowledge is not limited to academic theory, but also includes skills and experience in practical applications. Here is an overview of some of the core areas of electrical knowledge:Basic concept Circuit theory: includes the basic components of the circui

Applying alternating current to a DC motor can have a variety of adverse effects because DC motors are designed and operate to handle direct current. The following are the possible effects of applying AC to a DC motor:Cannot start and run properly No natural zero crossing: AC has no natural zero crossing to help the motor start, while DC motors rely on constant direct current to establish a magnetic field and start. Inversion phenomenon: The sinusoidal waveform of alternating current changes dir

Grid-connected inverters do need to be connected to the grid to function properly. These inverters are designed to convert direct current (DC) from renewable energy sources, such as solar photovoltaic panels or wind turbines, into alternating current (AC) that synchronizes with the grid in order to feed power into the public grid. Here are some of the key features and operating conditions of grid-connected inverters:The basic working principle of grid-connected inverterThe basic working principl