Pipe-type cable ampacities in the presence of harmonics

Palmer, John; Degeneff, R.C.; McKernan, T.M.; Halleran, T.M.

doi:10.1109/61.248274

Cited by 27 publications

(23 citation statements)

References 6 publications

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“…The 50% of demand is related to the 12‐pulse static power converter. Profile B was used to consider the triple harmonic order . Profile C is considered as a harmonic profile with triple harmonic orders that is lower than profile B.…”

Section: Simulation Resultsmentioning

confidence: 99%

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Electromagnetic and thermal analysis of underground power solid‐conductor cables under harmonic and unbalancing currents based on FEM

Rasoulpoor

Mirzaie

Mirimani

2017

Int J Numerical Modelling

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In this paper, electromagnetic and thermal analyses are performed on underground power solid-conductor cables under harmonic and unbalancing currents. The loss, life time, and produced magnetic field are calculated. Different balanced and unbalance load currents and also sinusoidal and harmonic profiles are considered. Moreover, the effects of different distances between cables are analyzed. Power cable losses and produced magnetic fields around power cables are computed based on electromagnetic analysis by using finite element method. Furthermore, finite element method thermal simulations are conducted to determine the cable life time based on Arrhenius model. Underground medium-voltage cables with metallic sheaths in flat and trefoil formations are considered. Metallic sheaths are bonded together and grounded in the single point or both ends. So, the effects of eddy and circulating currents of sheaths on power cable parameters are studied. Simulation results show the important effects of unbalancing and harmonic currents on the power cables parameters. Also, the effects are dependent on the harmonic frequency orders, installation method, and grounding system types.KEYWORDS electrical analysis, finite element method, magnetic field, power cable, thermal analysis

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Section: Simulation Resultsmentioning

confidence: 99%

“…Profile B was used to consider the triple harmonic order. 31 Profile C is considered as a harmonic profile with triple harmonic orders that is lower than profile B. Profile C is taken from the real measurement in Jain et al 30 that is the current drawn by arc welding plant of 24 kV.…”

Section: Thermal Analysis and Life Time Evaluationmentioning

confidence: 99%

Electromagnetic and thermal analysis of underground power solid‐conductor cables under harmonic and unbalancing currents based on FEM

Rasoulpoor

Mirzaie

Mirimani

2017

Int J Numerical Modelling

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“…In this paper, derating factors for presented sheathed and unsheathed cables are calculated for 5 types of harmonic current scenarios that are taken from IEEE scenarios . Harmonic current distribution for calculation of a derating factor is presented in Table .…”

Section: Calculation Of Derating Factormentioning

confidence: 99%

Calculation of losses and ampacity derating in medium-voltage cables under harmonic load currents using finite element method

Rasoulpoor

Mirzaie

Mirimani

2016

Int. Trans. Electr. Energ. Syst.

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Summary This paper investigates the influence of metallic sheaths on alternating current (AC) losses and ampacity of power cables. The AC losses are expressed as AC/direct current (DC) resistance in power cables, which is the main factor in loss computations. With regard to the importance of harmonic contents of the currents, a comprehensive study is performed on AC/DC resistance of medium‐voltage cables in the presence of harmonics. Different harmonic frequencies include triple and nontriple orders are considered. A derating factor is proposed on the basis of cable constructions. Two types of sheathed and unsheathed medium‐voltage power cables are considered. Also for metallic sheathed cables, 2 types of sheath grounding are investigated. It is shown that single‐point bonding and both‐ends bonding of sheaths have different effects on cable ampacity in harmonic frequencies. Moreover, different conductor cross sections and distances between cables are considered, and their effects on AC/DC resistance and ampacity derating are assessed. It is shown that these factors have important effects on AC/DC resistance and thus power cable losses. Furthermore, all cases are investigated in both flat and trefoil formations that are the most popular formations in power cables. To achieve precise results, we performed this study on the basis of finite element simulation, which is an exact way to cable losses computations in each configuration.

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“…To this aim, let the rms value of the th-harmonic current at time hours during the year ; the energy cost can be expressed as (4) where is the number of phase conductors, is the unit cost of the electric energy during the year , and the maximum order of harmonics. In (4), is the alternating current resistance per unit length of the conductor with cross section at a frequency corresponding to the th harmonic and it is given by (5) with and the conductor electrical resistivity at 20 C and the temperature coefficient of electrical resistivity at 20 C/K. Moreover, in (5), , are the skin-and proximity-effect factors and , the ratio of the losses in metallic sheaths and armour to the conductor losses; they are all dependent on the conductor cross section and evaluated at frequency corresponding to the harmonic of order .…”

Section: Medium-voltage Cable Costs In Nonsinusoidal Conditionsmentioning

confidence: 99%

On the economic selection of medium voltage cable sizes in nonsinusoidal conditions

Caramia

Carpinelli

Vitola

et al. 2002

IEEE Trans. Power Delivery

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Selection of cable size in the nonsinusoidal conditions is only based on ampacity considerations without any attention to the cost of the losses that will be suffered in the cable life. Since the cost of these losses (fundamental plus harmonics) can assume significant values, the selection of a cross section higher than required for ampacity considerations can result in a large reduction of cost . This paper proposes a method which allows the optimal economic selection of medium-voltage cables in nonsinusoidal operating conditions; it takes into account the initial investment costs and the Joule losses costs, including the additional costs due to current harmonics. It employs simplified expressions similar to those adopted by the IEC Standard in sinusoidal conditions, being the harmonic presence taken into account by a proper definition of a harmonic loss factor and by the introduction of harmonic coefficients to be predicted. Numerical applications to medium-voltage cables are developed and discussed in order to show the sensitivity of the cable optimum size to variations in the coefficients that characterize the harmonic presence.

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Pipe-type cable ampacities in the presence of harmonics

Cited by 27 publications

References 6 publications

Electromagnetic and thermal analysis of underground power solid‐conductor cables under harmonic and unbalancing currents based on FEM

Electromagnetic and thermal analysis of underground power solid‐conductor cables under harmonic and unbalancing currents based on FEM

Calculation of losses and ampacity derating in medium-voltage cables under harmonic load currents using finite element method

On the economic selection of medium voltage cable sizes in nonsinusoidal conditions

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