# US 12,191,048 B2 · Field grading members, cables having field grading members, and methods of making field grading members

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- Number: US 12,191,048 B2
- Document ID: US12191048B2
- Status: Granted
- Kind: B2
- Application number: 17/874,449
- Filed: 2022-07-27
- Published: 2022-11-17
- Granted: 2025-01-07
- Earliest claimed: 2019-11-01
- Assignees: Hamilton Sundstrand Corporation
- Applicants: Hamilton Sundstrand Corporation
- Inventors: Theresa A. Hugener; Peter J. Walsh; Haralambos Cordatos
- Web page: https://patentgrep.com/patent/US12191048B2

## CPC

- H01B 1/08: oxides
- H01B 3/441: {from alkenes}
- C08K 9/02: Ingredients treated with inorganic substances
- H01B 1/22: the conductive material comprising metals or alloys
- H01B 7/0009: {Details relating to the conductive cores}
- H01B 9/003: {including electrical control or communication wires}
- H01B 9/006: {Constructional features relating to the conductors}
- H01B 9/027: {composed of semi-conducting layers}
- H02G 1/14: for joining or terminating cables
- H02G 15/064: with devices for relieving electrical stress
- H02G 15/184: with devices for relieving electrical stress
- C08K 2201/001: Conductive additives
- H01B 13/0036: {Details}
- H01C 7/112: ZnO type
- H01C 17/06546: {Oxides of zinc or cadmium}
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H01C: RESISTORS

## Abstract

A field grading composite body includes a polymeric matrix and a particulate filler distributed within the polymeric matrix. Particles of the particulate filler include a core formed from a semiconductor material, an oxide mixed layer deposited on the core, and conducting oxide layer. The conducting oxide layer deposited on the oxide mixed layer to provide an electrical percolation path through the polymeric matrix triggered by strength of an electric field extending through the field composite body. Conductors and methods of making field grading composite bodies for conductors are also described.

## Claims

### Claim 1

A method of making a field grading member, comprising:
receiving a particulate filler, wherein the particular filler include a plurality of cores formed of zinc oxide doped with fluoride atoms;
depositing an oxide mixed layer on each of the plurality of cores;
depositing a conducting oxide layer on each of the oxide mixed layers of the cores; and
distributing the cores that have the oxide mixed layer and the conductive oxide layers deposited on them within a polymeric matrix to form a field grading member;
wherein the conductive oxide layer is deposited so that it provides an electrical percolation path through the polymeric matrix triggered by strength of an electric field extending through the field grading member.

### Claim 2 (depends on 1)

The method of claim 1, wherein depositing the conducting oxide layer includes immersing the plurality of cores in a metal halide solution.

### Claim 3 (depends on 2)

The method of claim 2, wherein depositing at least one of the oxide mixed layer and the conducting oxide layer includes exposing the plurality of cores to a humidified vapor phase of a metal halide.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
at a cable including a conductor member and an insulator member extending about the conductor member,
fixing the field grading member about a portion of the insulator member to limit magnitude of an electric field extending through the insulator member and associated with current flow through the conductor member.