Conductor assembly

Patent metadata

Field	Value
Publication number	US-9739805-B2
Application number	US-201414897688-A
Country	US
Kind code	B2
Filing date	Jun 19, 2014
Priority date	Jun 25, 2013
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A conductor assembly for a power network includes an inner conductor defining radial and axial directions, an insulating layer arranged around at least an axial section of the inner conductor, and a sensing electrode arranged radially outward of the insulating layer. The sensing electrode is operable as a first electrode of a sensing capacitor of a capacitive voltage sensor, in which sensing capacitor the inner conductor is operable as a second electrode. The conductor assembly further includes an electrically insulating spacer element arranged radially between the insulating layer and the sensing electrode.

First claim

The invention claimed is:

1. Conductor assembly for a power network, the conductor assembly comprising
an inner conductor defining radial directions and axial directions,
an insulating layer arranged around at least an axial section of the inner conductor, and
a sensing electrode, arranged radially outward of the insulating layer, and operable as a first electrode of a sensing capacitor of a capacitive voltage sensor, in which sensing capacitor the inner conductor is operable as a second electrode,
the conductor assembly further comprising an electrically insulating spacer element, arranged radially between the insulating layer and the sensing electrode,
wherein the spacer layer is selected such that the capacitance of the sensing capacitor falls within a desired range for a given voltage of the cable conductor,
wherein the spacer element comprises a silicone, a rubber or an ethylene propylene diene monomer.

2. Conductor assembly according to claim 1 , wherein the spacer element is arranged on the insulating layer.

3. Conductor assembly according to claim 1 , wherein the sensing electrode is arranged on the spacer element.

4. High-voltage or medium-voltage power cable comprising a conductor assembly according to claim 1 .

5. Conductor assembly according to claim 1 , wherein the spacer element comprises a spacer layer having a first and an opposed second major surface.

6. Conductor assembly according to claim 5 , wherein the first major surface of the spacer layer is arranged on the insulating layer.

7. Conductor assembly according to claim 5 , wherein the sensing electrode is arranged on the second major surface of the spacer layer.

8. Conductor assembly according to claim 1 , wherein the spacer element comprises a portion having a radial thickness of between 1 millimeter and 10 millimeters.

9. Conductor assembly according to claim 1 , wherein the insulating layer has a circumference, and wherein the spacer layer extends around a full circumference of the insulating layer.

10. Conductor assembly according to claim 1 , wherein the inner conductor of the conductor assembly comprises at least a portion of an inner conductor of a high-voltage or medium-voltage power cable, and wherein the insulating layer of the conductor assembly comprises at least a portion of an insulating layer of the high-voltage or medium-voltage power cable.

11. Conductor assembly according to claim 1 , wherein the sensing electrode is comprised in a cable accessory device, a cable splice body, or a cable termination body.

12. Conductor assembly according to claim 1 , wherein the sensing electrode comprises a layer of conductive or semiconductive material.

13. Conductor assembly according to claim 1 , comprising an electrically conductive voltage pickup element, arranged such as to be in an extended mechanical and electrical surface contact with the sensing electrode.

14. Power network comprising a high-voltage or medium-voltage power cable according to claim 4 .

Assignees

• 3M Innovative Properties Co

Inventors

• Gravermann Mark
• Busemann Friedrich A
• Lohmeier Gerhard
• Weichold Jens
• Schubert Bernd
• Stalder Michael H
• Zanoli Pasquale
• Bolcato Giuliano

Classifications

• G01R31/58

  Testing of lines, cables or conductors (testing of electric windings G01R31/72) · CPC title

• G01R27/26

  Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants {; Measuring impedance or related variables} · CPC title

• G01R19/0084

  Measuring voltage only · CPC title

• G01R15/16 Primary

  using capacitive devices · CPC title

• G01R27/2605

  Measuring capacitance (capacitive sensors G01D5/24) · CPC title