Very high-voltage dc line voltage sensor

Patent metadata

Field	Value
Publication number	US-2016274149-A1
Application number	US-201314442491-A
Country	US
Kind code	A1
Filing date	Nov 14, 2013
Priority date	Nov 16, 2012
Publication date	Sep 22, 2016
Grant date	—

Abstract

The invention provides a voltage sensor for a very high-voltage direct current line comprising two voltage divider stages connected in series, the sensor being characterized in that a first voltage divider stage (E 1 ) that divides the very high voltage to an intermediate voltage is constituted by at least two elementary voltage divider stages (Em) connected in series and distributed in a composite insulator (I), each elementary stage (Em) comprising a resistor Re in parallel with a capacitor Ce, the second voltage divider stage (E 2 ) that delivers the intermediate voltage being constituted by electronic components comprising capacitors and/or interchangeable resistors.

First claim

What is claimed is:

1 . A voltage sensor for a very high-voltage direct current line, the sensor consisting of a voltage divider comprising two voltage divider stages connected in series, an intermediate voltage being picked up at the connecting point of the two voltage divider stages, a first voltage divider stage (E 1 ) consisting of at least two elementary voltage divider stages (Em) connected in series and distributed in a composite insulator, characterized in that an elementary voltage divider stage (Em) comprises at least one capacitor (Ce) and at least one resistor (Re) in parallel, the capacitor and the resistor each having a first terminal fastened to a first electrically conductive plate (a 1 ) and a second terminal, opposite from the first terminal, fastened to a second electrically conductive plate (a 2 ), the first electrically conductive plate (a 1 ) and the second electrically conductive plate (a 2 ) each being surrounded by an electrically conductive cap (T), at least one electrically insulating holder part (S) that clamps the resistor and the capacitor being in contact with the inner wall of the composite insulator (I) so as to fasten the capacitor and the resistor to the inside of the composite insulator.

2 . A voltage sensor for a very high-voltage direct current line according to claim 1 , wherein the first electrically conductive plate (a 1 ) is a rigid plate of an electrically conductive first mechanical holder part and the second electrically conductive plate (a 2 ) is constituted by a flexible metal sheet in the shape of a spider that is secured to a steel rim of a second electrically conductive mechanical holder part, a first electrically conductive plate (a 1 ) and a second electrically conductive plate (a 2 ) of a single mechanical holder part being connected to each other by electrically conductive spacers (Ent).

3 . A voltage sensor according to claim 1 , wherein the second voltage divider stage (E 2 ) is made of electronic components comprising capacitors and/or resistors which are interchangeable.

4 . A voltage sensor according to claim 3 , wherein the second voltage divider stage (E 2 ) comprises at least one capacitor and at least one resistor in parallel contained within a leak tight box, a shielded cable electrically connecting the second voltage divider stage to the first voltage divider stage.

5 . A voltage sensor for a very high-voltage direct current line according to claim 1 , wherein an electronic circuit (C) has an input connected to an output of the second voltage divider stage and the electronic circuit (C) comprises circuits for processing the signal that it receives as input.

6 . A voltage sensor for a very high-voltage direct current line according to claim 5 , wherein the processing circuits include an analog to digital converter.

7 . A voltage sensor for a very high-voltage direct current line according to claim 1 , wherein the first voltage divider stage is fitted with means for measuring the temperature, which means are suitable for delivering a temperature of the sensor.

8 . A voltage sensor for a very high-voltage direct current line according to claim 5 , wherein the first voltage divider stage is fitted with means for measuring the temperature, which means are suitable for delivering a temperature of the sensor, and wherein the electronic circuit (C) includes means that are suitable for correcting the temperature drift of the resistances and/or the capacitances of the capacitor of the first and/or of the second voltage divider stage, on the basis of temperature measurements delivered by the temperature measuring means.

9 . A voltage sensor for a very high-voltage direct current line according to claim 1 , wherein the very high voltage lies in the range 100 kV DC to 1100 kV DC and the intermediate voltage lies in the range 100 V DC to 200 V DC.

10 . A voltage sensor for a very high-voltage direct current line according to claim 1 , wherein the composite insulator (I) is a tube made of epoxy fiber glass covered with fins made of silicone (b 1 , b 2 ).

Assignees

• Alstom Technology Ltd

Inventors

• Chatrefou Denis
• Mironneau Jean-François
• Troubat Vincent

Classifications

• G01R15/06 Primary

  having reactive components, e.g. capacitive transformer · CPC title