# US 2019/0172633 A1 · Magnetic flux leakage compensation structure

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- Number: US 2019/0172633 A1
- Document ID: US20190172633A1
- Status: Published application
- Kind: A1
- Application number: 15/770,192
- Filed: 2017-11-15
- Published: 2019-06-06
- Earliest claimed: 2017-01-19
- Assignees: Shandong Power Equipment Co., Ltd.; State Grid Shanghai Minicipal Electric Power Company
- Applicants: Shandong Power Equipment Co., Ltd; State Grid Shanghai Minicipal Electric Power Company
- Inventors: Chong Tan; Penghong Guo; Shijun Wang; Jidong Li; Guanghui Liu; Mingsheng Wang; Jianbin Yu; Tingting Li
- Web page: https://patentgrep.com/patent/US20190172633A1

## CPC

- H01F 27/346: {Preventing or reducing leakage fields (using magnetic shields H01F27/36; using auxiliary windings H01F27/38)}
- H01F 27/263: {Fastening parts of the core together}
- H01F 27/30: Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F 27/348: {Preventing eddy currents}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

An embodiment provides a magnetic flux leakage compensation structure, which includes an upper clamping piece and a lower clamping piece which are electrically disconnected from side-column tension plates and electrically connected with core-column tension plates, respectively, and which are electrically connected with each other through bypass cables. According to the magnetic flux leakage compensation structure provided by the embodiment, by the bypass cables connecting the upper and lower clamping pieces, currents flowing through the side-column tension plates and cores and induced voltages caused by the magnetic flux leakage in an electric circuit may be effectively avoided.

## Claims

### Claim 1

A magnetic flux leakage compensation structure, comprising an upper clamping piece (1) and a lower clamping piece (3), which are electrically disconnected from side-column tension plates (10) and electrically connected with core-column tension plates (6), respectively, and which are electrically connected with each other through bypass cables (5).

### Claim 2 (depends on 1)

The magnetic flux leakage compensation structure according to claim 1, wherein tension plate screws (11) are arranged at upper ends of the side-column tension plates (10) which are connected with side-column upper beams (9) through the tension plate screws (11); insulating sleeves are arranged between the tension plate screws (11) and the side-column upper beams (9); an insulating plate is arranged between the side-column upper beams (9) and an upper clamping piece web (2); and lower ends of the side-column tension plates (10) are connected with a lower clamping piece web (4).

### Claim 3 (depends on 1)

The magnetic flux leakage compensation structure according to claim 1, wherein the bypass cables (5) are connected with the upper clamping piece web (2) and the lower clamping piece web (4) through wiring blocks.

### Claim 4 (depends on 1)

The magnetic flux leakage compensation structure according to claim 1, wherein the bypass cables (5) are copper stranded wires with sectional areas of 240-300 mm2 and are wrapped by 3-10 mm for insulation on single sides, and there are 3, 4 or 5 cables on each side.

### Claim 5 (depends on 1)

The magnetic flux leakage compensation structure according to claim 1, wherein copper plates (7) are arranged at junctions of the core-column tension plates (6) and core-column upper beams (8) on the side where voltage regulation leads pass.

### Claim 6 (depends on 5)

The magnetic flux leakage compensation structure according to claim 5, wherein the copper plates (7) are 10-15 mm thick.