Correction factors for positive dc voltages

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Abstract

Direct-current voltages are used mainly to test equipment utilized in HV dc transmission systems, as an alternative to ac for testing cables, capacitors, insulations in which internal discharges may lead to degradation of the insulation under ac testing conditions, in investigations in discharge physics and dielectric behavior. For atmospheric air the voltage measurements under any conditions are related to the standard conditions employed the IEC-60 standard. It is demonstrated that the IEC correction procedure is not adequate for dc voltage measurements at high altitude; for example for rod-plane gaps there is a difference > 10% between experimental data obtained at 2240 m above sea level and those corrected with the IEC-60 procedure. This is mostly a consequence of the fact that the physical model employed, which is based on the field of propagation of streamers, fails to account for the combined effect of humidity and altitude. It is surmised that the propagation field of the prebreakdown streamers varies linearly with the air-density. The experimental rod-plane results obtained by the authors are better modeled by an alternative semi-empirical model. © 1998 IEEE.
Original languageAmerican English
Pages (from-to)541-544
Number of pages4
JournalIEEE Transactions on Dielectrics and Electrical Insulation
DOIs
StatePublished - 1 Dec 1998

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Voltage measurement
Insulation
Sea level
Testing
Electric potential
Air
Discharge (fluid mechanics)
Atmospheric humidity
Cables
Capacitors
Physics
Degradation

Cite this

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title = "Correction factors for positive dc voltages",
abstract = "Direct-current voltages are used mainly to test equipment utilized in HV dc transmission systems, as an alternative to ac for testing cables, capacitors, insulations in which internal discharges may lead to degradation of the insulation under ac testing conditions, in investigations in discharge physics and dielectric behavior. For atmospheric air the voltage measurements under any conditions are related to the standard conditions employed the IEC-60 standard. It is demonstrated that the IEC correction procedure is not adequate for dc voltage measurements at high altitude; for example for rod-plane gaps there is a difference > 10{\%} between experimental data obtained at 2240 m above sea level and those corrected with the IEC-60 procedure. This is mostly a consequence of the fact that the physical model employed, which is based on the field of propagation of streamers, fails to account for the combined effect of humidity and altitude. It is surmised that the propagation field of the prebreakdown streamers varies linearly with the air-density. The experimental rod-plane results obtained by the authors are better modeled by an alternative semi-empirical model. {\circledC} 1998 IEEE.",
author = "Calva, {P. A.} and Espino, {F. P.}",
year = "1998",
month = "12",
day = "1",
doi = "10.1109/94.708270",
language = "American English",
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journal = "IEEE Transactions on Dielectrics and Electrical Insulation",
issn = "1070-9878",
publisher = "Institute of Electrical and Electronics Engineers Inc.",

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TY - JOUR

T1 - Correction factors for positive dc voltages

AU - Calva, P. A.

AU - Espino, F. P.

PY - 1998/12/1

Y1 - 1998/12/1

N2 - Direct-current voltages are used mainly to test equipment utilized in HV dc transmission systems, as an alternative to ac for testing cables, capacitors, insulations in which internal discharges may lead to degradation of the insulation under ac testing conditions, in investigations in discharge physics and dielectric behavior. For atmospheric air the voltage measurements under any conditions are related to the standard conditions employed the IEC-60 standard. It is demonstrated that the IEC correction procedure is not adequate for dc voltage measurements at high altitude; for example for rod-plane gaps there is a difference > 10% between experimental data obtained at 2240 m above sea level and those corrected with the IEC-60 procedure. This is mostly a consequence of the fact that the physical model employed, which is based on the field of propagation of streamers, fails to account for the combined effect of humidity and altitude. It is surmised that the propagation field of the prebreakdown streamers varies linearly with the air-density. The experimental rod-plane results obtained by the authors are better modeled by an alternative semi-empirical model. © 1998 IEEE.

AB - Direct-current voltages are used mainly to test equipment utilized in HV dc transmission systems, as an alternative to ac for testing cables, capacitors, insulations in which internal discharges may lead to degradation of the insulation under ac testing conditions, in investigations in discharge physics and dielectric behavior. For atmospheric air the voltage measurements under any conditions are related to the standard conditions employed the IEC-60 standard. It is demonstrated that the IEC correction procedure is not adequate for dc voltage measurements at high altitude; for example for rod-plane gaps there is a difference > 10% between experimental data obtained at 2240 m above sea level and those corrected with the IEC-60 procedure. This is mostly a consequence of the fact that the physical model employed, which is based on the field of propagation of streamers, fails to account for the combined effect of humidity and altitude. It is surmised that the propagation field of the prebreakdown streamers varies linearly with the air-density. The experimental rod-plane results obtained by the authors are better modeled by an alternative semi-empirical model. © 1998 IEEE.

U2 - 10.1109/94.708270

DO - 10.1109/94.708270

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JO - IEEE Transactions on Dielectrics and Electrical Insulation

JF - IEEE Transactions on Dielectrics and Electrical Insulation

SN - 1070-9878

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