Electrical Engineering Guides

Distribution Cabinet

Adjustment Test Operation and Precautions of High-Voltage Power Distribution Cabinets in Power Systems

1. Key Points for Debugging High-Voltage Power Distribution Cabinets in Power Systems 1.1 Voltage Control During the debugging of high-voltage power distribution cabinets, voltage and dielectric loss show an inverse relationship. Insufficient detection accuracy and large voltage errors will lead to

By Oliver Watts 11/26, 2025
Gas Insulated Switchgear(GIS)

China's first ±550 kV DC GIS completes long-term energized test.

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 indust

By Baker 11/25, 2025
Voltage Regulating Transformer (VRT)

What are the installation procedures and the prescribed sequence for energizing and de-energizing voltage regulators?

Power voltage regulators are a major electrical equipment in distribution substations. Since the power supply capacity of most distribution substations is relatively small, the capacity of voltage regulators is generally below 1000 kV·A. Therefore, voltage regulators are transported to the site as c

By James 11/24, 2025
HV Switch

Policy-Driven Transformation: Eco-Friendly Solutions Take Center Stage

With the implementation of the EU’s new F-Gas Regulation (Regulation (EU) 2024/573), the power equipment industry is entering a countdown toward environmental transformation. The regulation explicitly prohibits, starting in 2026, the use of fluorinated greenhouse gases in medium-voltage switchgear r

By Baker 11/24, 2025
Gas Insulated Switchgear(GIS)

First Fully Unmanned GIS Inspection at ±800kV UHV Station

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 conv

By Baker 11/21, 2025
HV Switchgear

Latest Development Trends of SF6 Alternative Gas-Based High-Voltage Circuit Breakers

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

By Echo 11/21, 2025
HV Switchgear

The Countdown to SF₆ Phase-Out: Who Will Power the Grid of the Future?

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

By Echo 11/21, 2025
Electrical Substation

What Are the Differences Between Substations, Switching Stations, and Distribution Rooms?

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 interconne

By Echo 11/20, 2025
Switch Disconnectors

Installation Requirements and Procedures for 10 kV High-Voltage Disconnect Switches

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, sufficie

By James 11/20, 2025
Double-busbar configuration

Analysis of the Necessity of Verifying Voltage Switching During Switching Operations in Double-Busbar Configurations

1.Introduction In a double-busbar system, line energizing/de-energizing and bus transfer are fundamental switching operations. Under the double-busbar configuration, line protection voltage is derived from busbar potential transformers (PTs). The PTs are connected to the busbar via primary disconnec

By Echo 11/20, 2025
Switch Disconnectors

Common Issues and Handling Measures for 145kV Disconnector Control Circuits

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

By Felix Spark 11/20, 2025
Switch Disconnectors

What are the six operating principles of disconnect switches?

1. Operating Principle of the Disconnector The operating mechanism of the disconnector is connected to the active pole of the disconnector via a connecting tube. When the main shaft of the mechanism rotates 90°, it drives the insulating pillar of the active pole to rotate 90°. The bevel gears inside

By Echo 11/19, 2025

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Adjustment Test Operation and Precautions of High-Voltage Power Distribution Cabinets in Power Systems

China's first ±550 kV DC GIS completes long-term energized test.

What are the installation procedures and the prescribed sequence for energizing and de-energizing voltage regulators?

Policy-Driven Transformation: Eco-Friendly Solutions Take Center Stage

First Fully Unmanned GIS Inspection at ±800kV UHV Station

Latest Development Trends of SF6 Alternative Gas-Based High-Voltage Circuit Breakers

The Countdown to SF₆ Phase-Out: Who Will Power the Grid of the Future?

What Are the Differences Between Substations, Switching Stations, and Distribution Rooms?

Installation Requirements and Procedures for 10 kV High-Voltage Disconnect Switches

Analysis of the Necessity of Verifying Voltage Switching During Switching Operations in Double-Busbar Configurations

Common Issues and Handling Measures for 145kV Disconnector Control Circuits

What are the six operating principles of disconnect switches?

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