Electrical Engineering Guides

Switch Disconnectors

36kV Disconnect Switch Selection Guide & Key Parameters

Selection Guidelines for 36 kV Disconnect Switches When selecting the rated voltage, ensure that the disconnect switch’s rated voltage is equal to or higher than the nominal voltage of the power system at the installation point. For example, in a typical 36 kV power network, the disconnect switch mu

By James 11/19, 2025
Switch Disconnectors

Copper Conductor Size vs Temperature Rise in 145kV Disconnectors

The relationship between the temperature-rise current of a 145 kV disconnector and copper conductor size lies in balancing current-carrying capacity and heat dissipation efficiency. The temperature-rise current refers to the maximum continuous current a conductor can carry without exceeding its spec

By Echo 11/19, 2025
Transfer Switch

China has successfully developed the world's first ±408 kV DC transfer switch.

Recently, China’s switchgear manufacturer independently developed the world’s first ±408 kV DC transfer switch, which has successfully passed the full set of type tests. This marks the official successful development of the product and represents the first breakthrough in DC transfer switches applie

By Baker 11/18, 2025
Gas Insulated Switchgear(GIS)

China's first 252 kV mixed-gas double-break GIS product successfully passes on-site power frequency withstand voltage test.

Recently, Chinese GIS manufacturers announced exciting news: the first ZF11C-252(L) mixed-gas double-break GIS product developed by a Chinese GIS manufacturer successfully passed its on-site power frequency withstand voltage test on the first attempt at a project site. This achievement marks another

By Baker 11/18, 2025
Gas Insulated Switchgear(GIS)

Testing Methods for Newly Installed 35 kV GIS Gas-Insulated Switchgear

GIS (Gas-Insulated Switchgear) offers advantages such as compact structure, flexible operation, reliable interlocking, long service life, maintenance-free operation, and small footprint. It also possesses many irreplaceable advantages in insulation performance, environmental friendliness, and energy

By Oliver Watts 11/18, 2025
Switch Disconnectors

Design of an Intelligent Control System for Fully Enclosed Disconnectors in Distribution Lines

Intelligentization has become an important development direction for power systems. As a critical component of the power system, the stability and safety of 10 kV distribution network lines are vital to the overall operation of the power grid. The fully enclosed disconnector, as one of the key devic

By Dyson 11/17, 2025
Switch Disconnectors

Common Causes and Improvement Measures for Frequent Failures of GN30 Disconnectors in 10 kV Switchgear

1.Analysis of the Structure and Working Principle of GN30 Disconnector The GN30 disconnector is a high-voltage switching device primarily used in indoor power systems to open and close circuits under voltage but no-load conditions. It is suitable for power systems with a rated voltage of 12 kV and A

By Felix Spark 11/17, 2025
Switch Disconnectors

Research on Quality Control and Acceptance Standards for Installation of GW4-126 Disconnector

1.Working Principle and Structural Features of GW4-126 Disconnector The GW4-126 disconnector is suitable for AC 50/60 Hz power lines with a rated voltage of 110 kV. It is used to disconnect or connect high-voltage circuits under no-load conditions, enabling circuit switching, operational mode change

By James 11/17, 2025
Gas Insulated Switchgear(GIS)

Analysis and Handling of a Breakdown Discharge Fault in a 550 kV GIS Disconnector

1.Description of the Fault Phenomenon The disconnector fault in a 550 kV GIS equipment occurred at 13:25 on August 15, 2024, while the equipment was operating under full load with a load current of 2500 A. At the moment of failure, the associated protection devices acted promptly, tripping the corre

By Felix Spark 11/17, 2025
Switch Disconnectors

Impact Analysis of GIS Disconnector Operations on Secondary Equipment

Impact of GIS Disconnector Operations on Secondary Equipment and Mitigation Measures 1.Impacts of GIS Disconnector Operations on Secondary Equipment 1.1 Transient Overvoltage Effects During opening/closing operations of Gas-Insulated Switchgear (GIS) disconnectors, repeated arc reignition and extinc

By Echo 11/15, 2025
Switch Disconnectors

A Brief Analysis of Maintenance and Management of High-Voltage Disconnectors

High-voltage disconnectors are widely used in China’s power systems due to their convenient operation and strong practicality. However, during long-term operation, serious faults such as insulator fracture and failure to open/close still occur, significantly impacting the normal operation of power s

By Felix Spark 11/15, 2025
Switch Disconnectors

A Brief Discussion on the Retrofit and Application of Stationary Contacts in 220 kV Outdoor High-Voltage Disconnectors

The disconnector is the most widely used type of high-voltage switching equipment. In power systems, high-voltage disconnectors are high-voltage electrical devices used in coordination with high-voltage circuit breakers to perform switching operations. They play a critical role during normal power s

By Echo 11/14, 2025

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36kV Disconnect Switch Selection Guide & Key Parameters

Copper Conductor Size vs Temperature Rise in 145kV Disconnectors

China has successfully developed the world's first ±408 kV DC transfer switch.

China's first 252 kV mixed-gas double-break GIS product successfully passes on-site power frequency withstand voltage test.

Testing Methods for Newly Installed 35 kV GIS Gas-Insulated Switchgear

Design of an Intelligent Control System for Fully Enclosed Disconnectors in Distribution Lines

Common Causes and Improvement Measures for Frequent Failures of GN30 Disconnectors in 10 kV Switchgear

Research on Quality Control and Acceptance Standards for Installation of GW4-126 Disconnector

Analysis and Handling of a Breakdown Discharge Fault in a 550 kV GIS Disconnector

Impact Analysis of GIS Disconnector Operations on Secondary Equipment

A Brief Analysis of Maintenance and Management of High-Voltage Disconnectors

A Brief Discussion on the Retrofit and Application of Stationary Contacts in 220 kV Outdoor High-Voltage Disconnectors

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