Monitoring of a transmission line
AssigneeSafran Electronics & Defense
InventorsFrancois Guillot, Patrice Chetanneau
Life of this patent
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Abstract
A system including a coupling device and a data processing device designed to supply an excitation signal (SE) so that an internal signal (Φ) occurs in the coupling device, this internal signal (Φ) having a deformation resulting from the current to be measured (I0), obtain a measured signal (Sm) for a variable (Vm) sensitive to the deformation, supply a compensation signal (Sc) in order to cancel out the deformation, and evaluate the current to be measured (I0) based on the compensation signal (Sc). The data processing device is furthermore designed to analyse the measured signal (Sm) and to detect a fault on the trans-mission line based on this analysis.
Claims19
A system for monitoring a transmission line connected to a positive terminal (+) of a DC voltage source by a positive connection and to a negative terminal (−) of the DC voltage source by a negative connection, comprising:
- a coupling device connected to the positive connection, but not to the negative connection, to receive a current to be measured (I0) conveyed by the positive connection of the transmission line and originating from the positive terminal (+) of the DC voltage source;
- and
- a data processing device connected to the coupling device and designed for:
- supplying an excitation signal (SE) to the coupling device so that an internal signal (Φ) appears in the coupling device, this internal signal (Φ) having a deformation resulting from the current to be measured (I0),
- obtaining a signal (Sm) for measuring a variable (Vm) of the coupling device sensitive to the deformation of the internal signal (Φ),
- supplying a compensation signal (Sc) to the coupling device from the measurement signal (Sm) to cancel the deformation, and
- evaluating the current to be measured (I0) from the compensation signal (Sc);
- wherein the measurement signal (Sm) being additionally sensitive to the presence of a fault on the transmission line, the data processing device is additionally designed to analyse the measurement signal (Sm) and to detect, from this analysis, a fault on the transmission line.
A method for monitoring a transmission line connected to a positive terminal (+) of a DC voltage source by a positive connection and to a negative terminal (−) of the DC voltage source by a negative connection, comprising a current sensor (202) comprising a coupling device connected to the positive connection, but not to the negative connection, for receiving a current to be measured (I0) conveyed by the transmission line and originating from the positive terminal (+) of the DC voltage source, comprising:
- supplying an excitation signal (SE) to the coupling device so that an internal signal (Φ) appears in the coupling device, this internal signal (Φ) having a deformation resulting from the current to be measured (I0),
- obtaining a signal (Sm) for measuring a variable (Vm) of the coupling device sensitive to the deformation of the internal signal (Φ),
- supplying a compensation signal (Sc) to the coupling device from the measurement signal (Sm) to cancel the deformation;
- and
- evaluating the current to be measured (I0) from the compensation signal (Sc);
- wherein the measurement signal (Sm) being further sensitive to the presence of a fault on the transmission line, the method further comprises analysing the measurement signal (Sm) and detecting, from this analysis, a fault on the transmission line.
Dependencies are inferred from the claim text.