A Novel Method of Measuring Inherent Power System Charging Current

Paul, Dev; Sutherland, Peter E.; Panetta, Sergio

doi:10.1109/tia.2011.2168510

Cited by 22 publications

(10 citation statements)

References 16 publications

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“…The bolted line-to-ground fault current will then be 8 A maximum, provided the neutral resistor is rated at exactly 5.5 A to equal inherent system charging current [2]. The current edition of the IEEE STD.…”

Section: Background Historymentioning

confidence: 99%

High-Resistance Grounded Power System

Paul¹

2015

IEEE Trans. on Ind. Applicat.

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To minimize ground fault during a line-to-ground fault condition, it has been a common practice to use highresistance grounded (HRG) power systems, both at low voltage (LV) and at medium voltage (MV). The criteria for designing HRG systems are very well known to the industry; however, the opinions of industry experts have been divided on limiting the use of HRG systems for MV systems to voltages of less than 4.16 kV and phase-ground fault currents of less than 10 A without clarifying that it applies to systems which require continuous operation upon detecting first line-to-ground fault as it is now in reference [1]. This paper will review the background history of HRG power systems and their application to MV systems for specific industries and will make the case that voltages need not be limited to less than 4.16 kV and phase-ground fault current less than 10A, so long as the faulted power system is isolated within 10 cycles and there are no direct connected motors. This paper will discuss the potential damage and protection requirements of HRG systems for MV applications to ensure that a line-to-ground fault is cleared before it involves other phases to make a multiphase arcing ground fault.Index Terms-Arcing fault, fault resistance, ground fault protection relay, high-resistance grounded system, system charging current. 0093-9994 (c)

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Section: Background Historymentioning

confidence: 99%

High-Resistance Grounded Power System

Paul¹

2015

IEEE Trans. on Ind. Applicat.

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“…Discussion of an arcing line-ground fault, assuming impedance of the arc as a pure resistance, is in the published paper "A Novel Method of Measuring Inherent Power System Charging Current" [2]. Vector diagrams were used to illustrate: 1) the effect of arc resistance on a line-ground fault current; and 2) the damage caused at the fault location, and concluded that the HRG design criteria is maintained during line-ground arcing ground fault conditions.…”

Section: Design Criteria and History Of Hrgmentioning

confidence: 99%

“…1. By design criteria, maximum NGR rating in ohms will be in accordance with (2), where E LN is in volts, and I C is in amperes…”

Section: B Illustration Of Design Criteriamentioning

confidence: 99%

High-Resistance Grounded Power-System Equivalent Circuit Damage at the Line–Ground Fault Location—Part I

Paul¹

2014

IEEE Trans. on Ind. Applicat.

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This paper provides an electrical equivalent circuit of a high-resistance grounded (HRG) power supply transformer to discuss damage at a fault location so long as the fault remains a line-ground fault. Fault resistance and fault current that have an effect on damage are included in the equivalent circuit. Three-line diagrams showing fault current flows along with their vector diagrams are also included. Part II of this paper provides a similar equivalent circuit for an HRG grounded generator. This paper provides guidance to update the current edition of IEEE STD. 142 with respect to HRG systems.

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“…Grounding Criterion: The criterion of a HRG system is that during bolted line-to-ground fault condition, the neutral resistor should allow the resistive component of the fault current to be equal to or greater than the total system charging current [10] [13]. The combined system charging current of the ship and the shore power system should be known to determine the rating of the NGR.…”

Section: Grounding and Touch Potentialmentioning

confidence: 99%

“…To avoid such an uncertain situation a multiplication safety factor of 1.25 should be applied to the estimated or calculated system charging current to determine NGR rating by use of equation (1). Measurement of the system charging current in the case of a cold ironing project is also recommended to assure correct NGR rating [10]. Such measurements should involve largest expected ship for cold ironing project.…”

Section: Grounding and Touch Potentialmentioning

confidence: 99%

Cold Ironing Power System design and electrical safety

Paul¹,

Peterson

Chavdarian

2012

2012 Petroleum and Chemical Industry Conference (PCIC)

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Cold Ironing Power System design requires unique components to supply shore power to ships for "cold ironing" operation. Currently; development of new standards are in progress and operating procedures are being written to maximize electrical safety, standardization of the process and interchangeability from one location to another. This paper describes the power system design including power system protection scheme which should enhance the electrical safety by design. Power system grounding, equipment grounding, and touch potential that can impact personnel safety are described. A very basic outline of the operating procedures and training needed for the operators to maximize electrical safety during cold ironing operation are also included in the paper. In addition, paper provides the current status of the Draft IEC/ISO/IEEE Standards 80005-1 [5] and 80005-2[6].

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A Novel Method of Measuring Inherent Power System Charging Current

Cited by 22 publications

References 16 publications

High-Resistance Grounded Power System

High-Resistance Grounded Power System

High-Resistance Grounded Power-System Equivalent Circuit Damage at the Line–Ground Fault Location—Part I

Cold Ironing Power System design and electrical safety

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