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Novel Over-Current Tripping Device With Multilevel Adjustment Capability Based on Magnetic Coupling for Air Circuit Breakers in DC Traction System | IEEE Journals & Magazine | IEEE Xplore
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Novel Over-Current Tripping Device With Multilevel Adjustment Capability Based on Magnetic Coupling for Air Circuit Breakers in DC Traction System


Abstract:

In the dc traction power supply system in subway, over-current tripping device (OCTD) is essential for air circuit breakers as backup protection. At present, current thre...Show More

Abstract:

In the dc traction power supply system in subway, over-current tripping device (OCTD) is essential for air circuit breakers as backup protection. At present, current threshold value (Ith) of OCTD is adjusted by the cooperation of magnetic circuit regulating block (MCRB) and spring. Depending on MCRB is installed or not, only two-level adjustment can be realized, resulting in low adjustment accuracy of Ith. In this letter, a novel OCTD based on controllable magnetic coupling is proposed. Instead of using MCRB, an auxiliary winding wrapped on the static iron core is added, with different resistors and thyristors attached. By controlling thyristors, a wide-range and multilevel adjustment of Ith can be achieved. Benefits of the proposed method are: reducing the stiffness factor of spring from 55 to 42 N/mm, improving the adjustment accuracy from 0.66 to 0.33 kA/mm, and adjusting Ith online without power supply system interruption.
Published in: IEEE Transactions on Power Electronics ( Volume: 39, Issue: 10, October 2024)
Page(s): 12107 - 12112
Date of Publication: 08 April 2024

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