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Edwiin Knowledge

Hello，I'm Wdwiin. A decade of hands-on experience in electrical engineering, specializing in high-voltage systems, smart grids, and renewable energy technologies. Passionate about technical exchange and knowledge sharing, committed to interpreting industry trends with professional insights to empower peers. Connection creates value—let’s explore the boundless possibilities of the electrical world together!

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Medium Voltage DC Circuit Breaker Types and Applications

Medium voltage DC circuit breakers are suitable for applications in ships, urban subways, electric trains, microgrids (electric vehicles), distributed generation (solar energy), and battery-based systems (data centers). The relatively low circuit impedance in a DC case leads to higher amplitudes of

By Edwiin 11/11, 2024
Knowledge

Disconnector Switches Grouping in HVDC Grids

HVDC disconnector switches: HVDC disconnecting switches (DS) are used to disconnect various circuits in HVDC transmission networks. For example, the HVDC DS is applied to switching duties such as line or cable-charging current switching, no-load line, or cable transfer switching, in addition to disc

By Edwiin 11/12, 2024
Knowledge

Medium Voltage DC Solid-State Circuit Breakers Design and future

How medium voltage solid-state circuit breaker work: A solid-state DC breaker uses power semiconductors to interrupt the fault current. A simple topology of a solid-state DC breaker is shown in Figure. 1. Four diodes and an IGCT represent the main conduction path, while the surge arrester is used to

By Edwiin 11/13, 2024
Knowledge

Hybrid HVDC Breaker Definitions

Definitions for Hybrid HVDC Circuit Breakers Standard Definitions for AC Circuit Breakers Limitations : The standard definitions for AC circuit breakers do not directly translate to HVDC protection because the time frames and dynamics involved are different. Time Frames : AC circuit breakers have a

By Edwiin 11/14, 2024
Knowledge

Filter Earthing Switch(FES) role in HVDC grids

High voltage ground switch definition A high-voltage ground switch is a me chanical switching device used to connect high-voltage electrical equipment or lines to the ground to ensure safety during equipment overhaul or troubleshooting. It is usually installed next to high-voltage circuit breakers,

By Edwiin 11/15, 2024
Knowledge

FAQ About Lubrication Role in High Voltage Circuit Breakers

The Importance of Lubrication In high-voltage circuit breakers, lubrication plays a crucial role. Not only does lubrication affect the service life of the circuit breaker, but it also directly impacts its safety and reliability. Poor lubrication can lead to slow operation of the circuit breaker and

By Edwiin 11/16, 2024
Knowledge

Artificial current zero crossing creating method for DC switchgear

This method involves injecting or superimposing a current in the opposite direction of the current to be interrupted. The superimposed current can be provided through interaction with a parallel resonant circuit or by actively injecting current, thereby creating an artificial current zero crossing.

By Edwiin 11/18, 2024
Knowledge

HVDC main challenges with protection and switching

DC Fault Current Has No Natural Zero Crossing DC fault current does not have a natural zero crossing. This presents a problem because all mechanical DC circuit breakers rely on the natural zero crossing to interrupt the current arc. Reduced Impedance in DC Lines The impedance in DC lines is signific

By Edwiin 11/19, 2024
Knowledge

Low frequency AC short circuit generators fault test for HVDC circuit breakers

Given the Circuit Breaker Operating Time, the Magnitude of the Driving Voltage, the Turn-On Angle, the Circuit Inductance, and the Generator Frequency Are Key Design Parameters for Achieving Sufficient di/dt and Adequate Energy Supply. After current interruption, the dielectric stress can be provide

By Edwiin 11/20, 2024
Knowledge

Operation and time sequence in DC Circuit Breaker with active current injection

The Figure Shows the Current and Voltage Waveforms. When the DCCB (Direct Current Circuit Breaker) is in Normal Operation (Circuit Breaker S1 and Residual Current Circuit Breaker S2 are Closed, S3 is Open), the Opening Sequence Begins. The Circuit Breaker is Triggered by a Protective Relay. Here, th

By Edwiin 11/21, 2024
Knowledge

Synthetic current test for HVDC circuit breakers

Circuit Description A 12-pulse rectifier is used as the current source to provide a DC test current, while a voltage oscillation circuit provides the recovery voltage after current switching. Auxiliary breakers and spark gaps are implemented in the circuit to connect these two sources to the test ob

By Edwiin 11/22, 2024
Knowledge

Fault clearing currents curve in HVDC hybrid circuit breaker Simulink

Hybrid Circuit Breaker with IGBT Simulink Electronic Interruption In a hybrid circuit breaker with IGBT Simulink electronic interruption (as shown in the left figure), the fault current is diverted from the main path to the interrupter path by the IGBTs in path 1. Meanwhile, a local current zero-cro

By Edwiin 11/23, 2024

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