Power transformer neutral grounding reactor application and distribution feeder protection issues at CenterPoint Energy

Sorrells, P.; Benitez, Aldo J.

doi:10.1109/cpre.2005.1430419

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…Thus voltage of phase B has risen from 6350.85 to 6506.04V. The voltage rise of phase C can be calculated in a similar way and is 6506.04/-122.29V [8].…”

Section: [Iii] Fault Analysis : a Fault Current And Voltage Levels Imentioning

confidence: 93%

Selection of Neutral Grounding Reactor for Line to Ground Fault

Mathane¹,

Kesarker²,

Mangalvedekar³

et al. 2015

IJERT

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Single line to ground faults are the most prominent faults in the power system. This may damage the generators and transformers in the system ultimately leading to its failure. Introducing a neutral grounding reactor between the neutral and ground in the high voltage system, will reduce the fault current and hence will protect the power system components. The paper will discuss the operation, application and selection of the neutral grounding reactor for power system devices protection and secondary arc quenching.

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“…Thus voltage of phase B has risen from 6350.85 to 6506.04V. The voltage rise of phase C can be calculated in a similar way and is 6506.04/-122.29V [8].…”

Section: [Iii] Fault Analysis : a Fault Current And Voltage Levels Imentioning

confidence: 93%

Selection of Neutral Grounding Reactor for Line to Ground Fault

Mathane¹,

Kesarker²,

Mangalvedekar³

et al. 2015

IJERT

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“…The term neutral point grounding is widely used in North America while in the rest of the world as well as IEC normally use the term neutral earthing. The problems related with the neutral point grounding are, among the other works, treated also in [5][6][7]. Considering different types and different values of the impedance that characterizes the element that connects the neutral point with the ground, it is possible to distinct among five different types of the neutral point grounding:…”

Section: Neutral Point Groundingmentioning

confidence: 99%

Medium-voltage distribution feeders in closed-loop arrangement – neutral point grounding

Štumberger¹,

Deželak²,

Rošer³

et al. 2013

REPQJ

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This paper deals with medium-voltage networks where the closed-loop arrangement of feeders is used to improve the reliability of power supply. The paper focuses on the neutral point grounding in the medium-voltage loops. They are established by closing feeders, supplied form different transformers, in closed-loop arrangement. It is shown in the case when the neutral points of transformers supplying the feeders are grounded, the fault current at the fault location can be doubled, without to influence the neutral point current, which could cause safety problems.

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“…Consciously placed between the system ground and the neutral of the substation transformer is an inductor known as an NGR [13,14]. The NGR's impedance is added to the grounding system's impedance, increasing the total impedance that ground currents must cross.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method to Improve the Residual Life of Switchgear by Reducing the Impact Caused by Thermal and Mechanical Stresses Produced Due to SLG Cable Faults in Electrical Substations

Babu Naik Gugulothu,

Sanjay Lakshminarayanan,

Madhu Palati

et al. 2023

ARFMTS

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From the studies carried out in the field of power systems, it is found that the single line to ground fault is more common and produces severe electro-mechanical and thermal stress on the connected equipment. In urban areas, power utilities are replacing the overhead conductors with underground cables due to low availability of space for new lines or ROW issues. With the increase in the number of power cables, it is becoming difficult for the utilities to maintain and test the healthiness of the cables. On the other side, due to advances in computational capabilities, the manufacturers are providing an optimized solution which is reducing the fault feeding capability of the equipment and equipment are failed frequently. In this paper, a new advanced method of protecting the power transformers from SLG faults using both conventional and automated techniques is proposed. A combined solution using conventional and automation provides a redundant and robust approach to improve the residual life of equipment. To limit the fault current due to SLG faults neutral grounding reactor (NGR) is proposed, and GOOSE technique is used to isolate the equipment from the fault as soon as possible. The proposed method is simulated using MATLAB/SIMULINK and results obtained are satisfactory.

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Power transformer neutral grounding reactor application and distribution feeder protection issues at CenterPoint Energy

Cited by 9 publications

References 6 publications

Selection of Neutral Grounding Reactor for Line to Ground Fault

Selection of Neutral Grounding Reactor for Line to Ground Fault

Medium-voltage distribution feeders in closed-loop arrangement – neutral point grounding

A Novel Method to Improve the Residual Life of Switchgear by Reducing the Impact Caused by Thermal and Mechanical Stresses Produced Due to SLG Cable Faults in Electrical Substations

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