Novel Over-current Tripping Device with Multi-level Adjustment Capability Based on Magnetic Coupling for Air Circuit Breakers in DC Traction System

Weijie Wen; Jinghan Fan; Bin Li; Qingyao Sun; Jinchuan Song; Marjan Popov

doi:10.1109/TPEL.2024.3385354

Novel Over-current Tripping Device with Multi-level Adjustment Capability Based on Magnetic Coupling for Air Circuit Breakers in DC Traction System

Weijie Wen, Jinghan Fan^*, Bin Li^*, Qingyao Sun, Jinchuan Song, Marjan Popov

^*Corresponding author for this work

Intelligent Electrical Power Grids

Research output: Contribution to journal › Article › Scientific › peer-review

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 (I _th) 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 I _th. 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 I _th 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 I _th online without power supply system interruption.

Original language	English
Pages (from-to)	12107-12112
Number of pages	6
Journal	IEEE Transactions on Power Electronics
Volume	39
Issue number	10
DOIs	https://doi.org/10.1109/TPEL.2024.3385354
Publication status	Published - 2024

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

air circuit breaker
over-current tripping device
current threshold value
magnetic coupling
thyristor module

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10.1109/TPEL.2024.3385354

Novel_Over-Current_Tripping_Device_With_Multilevel_Adjustment_Capability_Based_on_Magnetic_Coupling_for_Air_Circuit_Breakers_in_DC_Traction_SystemFinal published version, 1.97 MB

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title = "Novel Over-current Tripping Device with Multi-level 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 threshold value (I th) 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 I th. 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 I th 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 I th online without power supply system interruption.",

keywords = "air circuit breaker, over-current tripping device, current threshold value, magnetic coupling, thyristor module",

author = "Weijie Wen and Jinghan Fan and Bin Li and Qingyao Sun and Jinchuan Song and Marjan Popov",

note = "Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. ",

year = "2024",

doi = "10.1109/TPEL.2024.3385354",

language = "English",

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AU - Wen, Weijie

AU - Fan, Jinghan

AU - Li, Bin

AU - Sun, Qingyao

AU - Song, Jinchuan

AU - Popov, Marjan

N1 - Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

PY - 2024

Y1 - 2024

N2 - 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 (I th) 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 I th. 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 I th 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 I th online without power supply system interruption.

AB - 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 (I th) 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 I th. 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 I th 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 I th online without power supply system interruption.

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Novel Over-current Tripping Device with Multi-level Adjustment Capability Based on Magnetic Coupling for Air Circuit Breakers in DC Traction System

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