GIC mitigation: a neutral blocking/bypass device to prevent the flow of GIC in power systems

Kappenman, John G.; Norr, S.R.; Sweezy, G.; Carlson, D.L.; Albertson, V. D.; Harder, John E.; Damsky, B.L.

doi:10.1109/61.85876

Cited by 82 publications

(25 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This effect is known as half-cycle saturation. Therefore capacitor in series for preventing dc currents or other appended resistance for decreasing dc currents installed in the neutral of transformers is the principle of [5] some neutrals blocking devices Transformers of different core and winding configurations respond differently to DC bias for providing various conducting paths for DC flux. Some research and experiments on small models testify some conclusions 6[1[71.Three-phase five-legged core form transformers are strongly susceptible because the fourth and fifth limbs provide the loop for DC flux.…”

Section: Analysis Of Tolerated DC Currents Of Transformersmentioning

confidence: 99%

Research on Testing of Over-exciting to Evaluate the Tolerated DC Currents of Transformers

Liu

Wen³

et al. 2006

2006 IEEE 8th International Conference on Properties and Applications of Dielectric Materials

View full text Add to dashboard Cite

During monopolar operation of HVDC systems with ground return, large currents returned from earth may enter into neutrals of transformers, which causes DC bias of transformers and influence transformers running. The reason of DC bias of transformers and the factor of tolerated DC bias are analyzed in this paper. Great capacity transformers constructed in the form of three-phase groups or three-phase five-legged are more prone to DC bias saturation because the air gaps between laminations are small. According to simulation of a single phase two-winding transformers model the exciting currents of transformers under AC over exciting and DC bias analyzed. More odd components appear in the symmetrical exciting current under over-exciting. Some even components appear in the asymmetrical exciting current under DC bias. Saturation effect caused by over-exciting and DC bias is similar in the influence of transformers. Exciting current can be as the indicating depicting the change of magnetic field within transformer. The testing of over-exciting in transformers can be used to evaluate the tolerated DC currents of transformers. This method of evaluation based over-exciting is simple and available.

show abstract

Section: Analysis Of Tolerated DC Currents Of Transformersmentioning

confidence: 99%

Research on Testing of Over-exciting to Evaluate the Tolerated DC Currents of Transformers

Liu

Wen³

et al. 2006

2006 IEEE 8th International Conference on Properties and Applications of Dielectric Materials

View full text Add to dashboard Cite

show abstract

“…Jedno od mogućih rešenja predviđa ugradnju kondenzatora u neutralnu tačku energetskog transformatora [13]. Kondenzator blokira kvazi-DC struju (GIC), istovremeno obezbeđujući niskoomsku spregu neutralne tačke sa sistemom uzemljenja.…”

Section: Slika 3 -Uz Objašnjenje Uticaja DC Struje Na Talasniunclassified

Overview of the problems related to the impact of geomagnetic induced current

Kostić¹

2017

Tehnika

View full text Add to dashboard Cite

“…To inhibit the adverse effects of GIC on the power system, At present, there are three kinds of control measures which mainly used [4][5][6]. (1)Compensation measures: in series with a DC voltage source on the transformer neutral point, by controlling the size of the output DC current and direction of it, in order to offset the original geomagnetic induced current;…”

Section: Introductionmentioning

confidence: 99%

Optimal Governance of GIC in Power Grid Based on the Sensitivity Analysis Method

Hongzhan

Liu

Zheng

2012

2012 Asia-Pacific Power and Energy Engineering Conference

View full text Add to dashboard Cite

GIC will threaten safety and stable operation of power systems, but installing the management devices of GIC in a substation can not solve the problem of GIC fundamentally. Therefore, the article studied GIC model. Taking the grounding currents of all substations of whole power network not to exceed as objective: the article optimized governance program using the sensitivity analysis method and verified the effectiveness and feasibility of the optimization measure by giving the results of Heilongjiang 500kV planning power grid in late 2011.

show abstract

GIC mitigation: a neutral blocking/bypass device to prevent the flow of GIC in power systems

Cited by 82 publications

References 0 publications

Research on Testing of Over-exciting to Evaluate the Tolerated DC Currents of Transformers

Research on Testing of Over-exciting to Evaluate the Tolerated DC Currents of Transformers

Overview of the problems related to the impact of geomagnetic induced current

Optimal Governance of GIC in Power Grid Based on the Sensitivity Analysis Method

Contact Info

Product

Resources

About