Analysis of DC Fast Circuit Breaker Opening and Arc Extinction in Urban Rail Transit Traction Power Supply System
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 7
Abstract
Objective Arc extinction technology for DC (direct current) is one of the design challenges in urban rail transit traction power supply systems. Therefore, it is necessary to analyze the principles of DC opening and arc extinction for main DC fast circuit breakers. Method The principles of DC current interruption and arc extinction are introduced. The stable burning point and extinction conditions of DC current are discussed. Parameters for DC arc interruption are analyzed with an introduction to the arc extinction design principles of DC fast circuit breakers. Causes for the easy burning damage of DC fast circuit breakers in metro power supply systems are examined. Result & Conclusion To interrupt a DC arc, higher arc voltage than the power supply voltage is required, because increasing the arc voltage can extinguish the DC arc. The opening process of DC fast circuit breakers needs to consider both the arc burning time and system overvoltage factors. During the design and development of DC circuit breakers, attention should be paid to non-stable arc voltage and arc voltage for small current interruptions. During arc extinction, setting an additional RC (resistor-capacitor circuit) blowout coil during arc extinction, with the design of metal grids in the arc extinction chamber, can stabilize the arc voltage.
Authors and Affiliations
Junfeng MENG, Genshui HU, Zhiqi GUO, Xingjian HE
Keywords
Related Articles
- EP ID EP742642
- DOI 10.16037/j.1007-869x.2024.07.058
- Views 27
- Downloads 0
Control Algorithm of Train Autonomous Control System in Turnout Safety Zones
[Objective] Unlike the existing CBTC (communication-based train control) system control mechanism, the ATC (autonomous train control) system achieves autonomous train operation by directly controlling wayside resources....
Calculation of Shield Tunneling Response Based on Subloading Cam-Clay Model
［Objective］ During shield tunneling in water-rich soft strata, ground deformation is often influenced by the combined effects of soil strength, deformation, and permeability characteristics. The time effect caused by p...
Research on Switch Machine Fault Prediction Based on CHMM
Objective As an important component of urban rail transit signal equipment, once the switch machine malfunctions, the operation will be seriously affected. Monitoring and predicting its health status is particularly impo...
Application of Impulse Response Characteristics in Rail-ground Transition Resistance Measurement
Objective The stray current harm in urban rail transit lines is increasingly non-ignorable. Stray current is not easy to be detected, and the amount of the rail-ground transition resistance is a crucial factor affecting...
Safety Envelope Management Method for Marshaled Trains Based on Time Delay Protection
[Objective] In flexible marshaled trains, the communication delay between the master railcar, subordinate railcar and ZC (zone controller) exhibits asynchrony, leading to potential issues such as overlapping, misalignmen...