Device for monitoring the vacuum quality of a vacuum circuit breaker

Patent metadata

Field	Value
Publication number	US-10153112-B2
Application number	US-201515328727-A
Country	US
Kind code	B2
Filing date	Sep 18, 2015
Priority date	Sep 25, 2014
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

A device for monitoring vacuum quality of a vacuum circuit breaker, the device including at least one rigid assembly including a first stationary conductive surface that is separated by an insulating layer from a second stationary conductive surface that is grounded. The assembly forms a first capacitor having a fixed value, the first stationary conductive surface being arranged opposite an electrically active portion of the vacuum circuit breaker to form, together with the portion, a second capacitor, and an electronic circuit for measuring a variation in voltage of the first capacitor that is representative of a change in state of the vacuum of the circuit breaker.

First claim

The invention claimed is:

1. A device for monitoring vacuum quality of a vacuum circuit-breaker, comprising:
at least one rigid assembly comprising a first stationary conductive surface that is separated by an insulating layer from a second stationary conductive surface to form a first capacitor having a fixed value; and
an electronic circuit configured to measure a variation in a voltage on the first capacitor that is representative of a change in state of the vacuum of the circuit-breaker,
wherein the first stationary conductive surface forms a second fixed capacitor in combination with an electrically active element of the vacuum circuit-breaker.

2. The device as claimed in claim 1 , wherein the insulating layer is formed by a honeycomb structure.

3. The device as claimed in claim 1 , wherein the insulating layer is formed by a foam structure.

4. The device as claimed in claim 1 , wherein the insulating layer is formed by an epoxy resin plate.

5. The device as claimed in claim 1 , wherein the rigid assembly is mounted on a moveable truck which is connected to ground.

6. The device as claimed in claim 1 , wherein the rigid assembly is attached to the external surface of a vacuum bottle of the vacuum circuit-breaker in a form of a patch, in electrical contact with the electrically active element.

7. A device for monitoring vacuum quality of a three-phase vacuum circuit-breaker, comprising, for each phase, a rigid assembly as claimed in claim 1 , and each rigid assembly further comprises an additional capacitor, arranged for recovery of a current for supply of the electronic circuit configured to detect a change in state of the vacuum.

8. A device for monitoring vacuum quality of a vacuum circuit-breaker, comprising:
at least one rigid assembly comprising a first stationary conductive surface that is separated by an insulating layer from a second stationary conductive surface to form a first capacitor having a fixed value; and
an electronic circuit configured to measure a variation in a voltage on the first capacitor that is representative of a change in state of the vacuum of the circuit-breaker,
wherein the rigid assembly is arranged on an interior of a cylindrical electric shielding, at least one exterior surface of which forms a second fixed capacitor, in combination with ground.

9. A device for monitoring vacuum quality of a vacuum circuit-breaker, comprising:
at least one rigid assembly comprising a first stationary conductive surface that is separated by an insulating layer from a second stationary conductive surface to form a first capacitor having a fixed value; and
an electronic circuit configured to measure a variation in a voltage on the first capacitor that is representative of a change in state of the vacuum of the circuit-breaker,
wherein the rigid assembly is formed on a printed circuit board, onto which the first conductive surface and the second conductive surface are etched, separated by the insulating layer.

Assignees

• Schneider Electric Ind Sas

Inventors

• Schellekens Hans
• Gauthier Jean-Pierre
• Cardoletti Olivier
• Durand Maxime

Classifications

• H02B11/12

  with isolation by horizontal withdrawal · CPC title

• G01R31/25

  Testing of vacuum tubes · CPC title

• H01H33/668 Primary

  Means for obtaining or monitoring the vacuum · CPC title

• H05K2201/10015

  Non-printed capacitor · CPC title

• H05K1/18

  structurally associated with non-printed electric components (H05K1/16 takes precedence) · CPC title