On the DC Conductivity of HV DC Cable Insulation - Cautions in using the Empirical Models

Reddy, C. C.; Ramu, T.S.

doi:10.1109/elinsl.2008.4570272

Cited by 15 publications

(4 citation statements)

References 4 publications

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“…The relative dielectric constants of XLPE, SIR and EPDM are 2.3, 2.8 and 2.6, respectively. The DC conductivity of the three materials is measured and then fitted according to Equation (1) [3] , with the values of parameters A, φ, and B shown in Table 1…”

Section: Cable Joint Materials Propertiesmentioning

confidence: 99%

Effect of Space Charge on Stationary and Transient Electric Field Distribution of HVDC Cable Joint

Zhao

Zhang

et al. 2023

J. Phys.: Conf. Ser.

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The conversion of AC XLPE cable lines into direct-current (DC) operation has been proven to be an effective means to improve the transmission capacity of the system. Prefabricated joints are the weakest points of a cable line because of the complex structures, and composite interfaces contained. Therefore, it is of great theoretical and engineering significance to study the field strength distribution of XLPE AC cable prefabricated joints under DC voltage, effectively evaluate their DC tolerance characteristics, and provide a basis for the construction and transformation of XLPE cable DC distribution network system. This paper takes the silicone rubber (SIR), and ethylene-propylene-diene monomer (EPDM) prefabricated joints of 10kV XLPE cables as an example, the cable joint temperature field, and electric field coupling simulation model is established by the finite element analysis software COMSOL Multiphysics. The steady and transient electric field simulation of the joints under different DC voltages and load conditions are carried out considering the influence of space charge. The results show that with the increase of applied voltages and load level, the space charge injection increases, and the maximum steady state field strength in the joint is concentrated at the root of the stress cone, showing an increasing trend. Compared with the SIR joint, the field strength in the EPDM joint is higher. The capacitive component of the field strength in the joint is proportional to the peak value of the impulse voltage under the DC superimposed impulse voltage. In other words, the transient electric field equation meets the superposition principle applied.

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Section: Cable Joint Materials Propertiesmentioning

confidence: 99%

Effect of Space Charge on Stationary and Transient Electric Field Distribution of HVDC Cable Joint

Zhao

Zhang

et al. 2023

J. Phys.: Conf. Ser.

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“…In turn, conductivity depends on temperature field, electric field, and material of the insulation. Generally, The EPR conductivity can be expressed by empirical formulas such as [21], [34], and [35]:…”

Section: Electric Conductivity and Electric Fieldmentioning

confidence: 99%

Heat Transfer Challenges for MVDC Power Cables Used in Wide Body All Electric Aircraft Under Low Pressures

2022

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Power cables are a vital component of the future electric power systems (EPS) envisaged in wide body all electric aircraft (AEA). They are required to be high power delivery and low system mass. Designing proper power cables for AEA faces thermal challenges due to the lower pressure of 18.8 kPa at the cruising height of a wide body aircraft. Due to the limited heat transfer at that pressure, the temperature field distribution across the aircraft cable, mainly a function of pressure, surface emissivity, and ambient surface geometry, is likely to diverge from that at atmospheric pressure. Moreover, temperature field distribution affects the conductivity of the insulation, which in turn alters and may inverse the electric field distribution across the DC cables. Therefore, a coupled multi-physics study should be conducted to calculate the temperature field and electric field across the cable at different ambient temperatures and various possible geometries of the ambient environment. In this paper, the temperature field distribution across a 5 kV DC cable is studied at atmospheric and 18.8 kPa pressures. The voltage level of 5 kV was resulted from our previous studies where we proposed new EPS architectures for a wide-body AEA. The main purpose of this study is to obtain the maximum permissible current flowing the cable at the atmospheric and 18.8 kPa pressures regarding the thermal limits of the cable. It is shown that at 18.8 kPa the maximum permissible current flowing the cable is decreased by 14.75% compared to its value at atmospheric pressure when the size of the ambient surface is 250 mm. Also, the electric conductivity and electric field across the cable insulation are evaluated at different conductor currents and insulator temperature gradients. INDEX TERMSAircraft electrification, all electric aircraft (AEA), MVDC power cable, electric power system (EPS), finite element model (FEM), heat convection, thermal analysis.

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“…The electrical conductivity of most solid dielectrics is dependent on temperature T and electric field E [3] [5]. Different semiempirical equations have been used in the literature [6]. Let us assume the following one as published in [7]:…”

Section: Differences Between Ac and DC Cablesmentioning

confidence: 99%

Influence of irregularities within electric fields in high voltage cables

Gutiérrez

Sancho

Fontán

et al. 2011

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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On the DC Conductivity of HV DC Cable Insulation - Cautions in using the Empirical Models

Cited by 15 publications

References 4 publications

Effect of Space Charge on Stationary and Transient Electric Field Distribution of HVDC Cable Joint

Effect of Space Charge on Stationary and Transient Electric Field Distribution of HVDC Cable Joint

Heat Transfer Challenges for MVDC Power Cables Used in Wide Body All Electric Aircraft Under Low Pressures

Influence of irregularities within electric fields in high voltage cables

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