Alternatives for blocking direct current in AC system neutrals at the Radisson/LG2 complex

Eitzmann, M.A.; Walling, R.; Sublich, M.; Khan, Ashfaque Hossain; Huynh, H.; Granger, M.; Dutil, A.

doi:10.1109/61.141850

Cited by 35 publications

(3 citation statements)

References 2 publications

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“…DC magnetic bias is the abnormal working condition of transformer. DC current flow in transformer winding, so that a DC magnetic potential or DC magnetic flux establish in the iron core of transformer, and then resulting many electromagnetic effect [7]. As shown in the Figure 1, the excitation characteristics curve of transformer.…”

Section: The Mechanism Of DC Magnetic Biasmentioning

confidence: 99%

Research on the Optimized Network Configuration of DC Blocking Device

Xia¹,

Xie²,

Zhou³

2014

JPEE

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HVDC transmission system has considerable impact on the surrounding power transformers when the system is running in the unipolar ground mode, which will cause the DC magnetic biasing phenomenon on transformers. This problem would be more serious, after commission and operation of UHVDC transmission system in China. According to the Guangdong power grid under the influence of DC magnetic bias seriously, but little research about the using of blocking device, this paper proposed an optimization scheme about the usage of blocking device combination. Firstly, the subject studied the method of suppressing transformer neutral point DC depending on analysis the mechanism of magnetic biasing, and then found out the changes of power grid after using the capacitance blocking device which is popular used by Guangdong power grid. The particle swarm optimization (PSO) has been used to find a better way to suppress the DC in power grid, and combined with NSGA to solve the mixed integer programming problem. The final data validation of this method is valuable in engineering application.

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Section: The Mechanism Of DC Magnetic Biasmentioning

confidence: 99%

Research on the Optimized Network Configuration of DC Blocking Device

Xia¹,

Xie²,

Zhou³

2014

JPEE

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“…At present, a lot of researches have been done on the DC bias problem at home and abroad [4][5]. In 1992, M. A. Eitzmann et al published several schemes for suppressing DC current targeting the Quebec hydro-power station.…”

Section: Introductionmentioning

confidence: 99%

“…The DC bias produces a large DC component in the windings of the transformer in operation, resulting in half-wave saturation of the core, resulting in harmonics, causing vibration, noise, overheating, and other problems, which can cause damage to the transformer in severe cases. Harmonics may also cause resonance damage to capacitors and reactors, and cause protection malfunctions [1][2][3].At present, a lot of researches have been done on the DC bias problem at home and abroad [4][5]. In 1992, M. A. Eitzmann et al published several schemes for suppressing DC current targeting the Quebec hydro-power station.…”

mentioning

confidence: 99%

Research and analysis on suppression and influence of transformer direct current bias

Wang

Chen

Zhang

et al. 2022

J. Phys.: Conf. Ser.

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DC bias generates a large DC component in the windings of the transformer in operation, thereby generating harmonics, causing vibration, noise, and overheating. In severe cases, it can cause damage to the transformer, which will affect the safe and stable operation of the AC system. This article takes the DC bias of the main transformer of a 220kV substation as an example, and uses the capacitance isolation method to suppress the DC bias. Due to the addition of capacitor equipment at the neutral point, the zero-sequence impedance of the main transformer and the change of the zero-sequence impedance of the power grid are changed, which has an impact on the zero-sequence (directional) current protection and ground distance protection. Through theoretical analysis and simulation research verification, for general 220kV substations, the capacitor DC isolation method (1.2Ω) can be used to suppress DC bias, which has a small impact on the relay protection and does not need to adjust the related protection settings.

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DC Ground Electrode

Zeng

Zhang

2012

Methodology and Technology for Power System Grounding

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Alternatives for blocking direct current in AC system neutrals at the Radisson/LG2 complex

Cited by 35 publications

References 2 publications

Research on the Optimized Network Configuration of DC Blocking Device

Research on the Optimized Network Configuration of DC Blocking Device

Research and analysis on suppression and influence of transformer direct current bias

DC Ground Electrode

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