Method And System For Locating Defects On An Electric Cable
AssigneesElectricite de France, Institut Natitonal De Recherche En Informatique Et En Automatique
InventorsNassif Berrabah, Qinghua Zhang
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Abstract
The present invention relates to a method for diagnosing defects on a cable, including the following steps: measuring parameters S of the cable; determining the apparent impedance of the cable as a function of the position z along the cable, from one end of the cable Zl(z), as well as from the other end of the cbale Zr(z); determining an estimation of the linear resistance R(z) of the cable as a function of the position z along the cable; and detecting a defect on a cable when the estimated linear resistance R(z) deviates from a reference value.
Claims7
A method for locating defects on a cable comprising the following steps:
- Measuring the parameters S of the cable;
- Determining the apparent impedance of the cable as a function of the position z along the cable, both from one end of the cable Zl(z), and also from the other end of the cable Zr(z);
- Determining an estimation of the linear resistance R(z) of the cable as a function of the position z along the cable:
- R
-
- (
- z
- )
- =
- [
- Z
- l
-
- (
- z
- )
- -
- Z
- r
-
- (
- z
- )
- ]
- -
- [
- Z
- l
-
- (
- z
- +
- dz
- )
- -
- Z
- r
-
- (
- z
- +
- dz
- )
- ]
- 2
-
- dz
- Detecting a defect on a cable when the estimated linear resistance R(z) moves away from a reference value.
A system for location of defects on a cable, characterized in that it comprises:
- measuring means of the reflection coefficient of the cable at both ends of the cable;
- determination means of the apparent impedance of the cable as a function of the position z along the cable, both from one end of the cable Zl(z) and also from the other end of the cable Zr(z);
- determination means of an estimation of the linear resistance R(z) of the cable as a function of the position z along the cable from the values of apparent impedance Zl(z) and Zr(z):
- R
-
- (
- z
- )
- =
- [
- Z
- l
-
- (
- z
- )
- -
- Z
- r
-
- (
- z
- )
- ]
- -
- [
- Z
- l
-
- (
- z
- +
- dz
- )
- -
- Z
- r
-
- (
- z
- +
- dz
- )
- ]
- 2
-
- dz
- detection means of a defect on a cable when the estimated linear resistance R(z) moves away from a reference value.
Dependencies are inferred from the claim text.