# US 8,785,769 B2 · Method for vertically grounding and leading down from inner side of composite pole tower and pole tower thereof

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- Number: US 8,785,769 B2
- Document ID: US8785769B2
- Status: Granted
- Kind: B2
- Application number: 13/395,110
- Filed: 2010-05-14
- Published: 2012-07-05
- Granted: 2014-07-22
- Earliest claimed: 2009-09-08
- Assignees: Shenzhen Power Supply Burea of Guangdong Power Grid Corp.; State Grid Electric Power Research Institute
- Applicants: Zhijun Li; Hanming Li; Ting Liu; Qianhu Wei; Feng Huo; Ming Zhan; Min Dai; Shicong Deng; Kai Liu; Ning Cao; Xiong Wu; Yuhua Zhang; Dingxie Gu; Weicai Zhou; Peihong Zhou; Zhenqiang Li; Ying Lou; Huiwen He
- Inventors: Zhijun Li; Hanming Li; Ting Liu; Qianhu Wei; Feng Huo; Ming Zhan; Min Dai; Shicong Deng; Kai Liu; Ning Cao; Xiong Wu; Yuhua Zhang; Dingxie Gu; Weicai Zhou; Peihong Zhou; Zhenqiang Li; Ying Lou; Huiwen He
- Web page: https://patentgrep.com/patent/US8785769B2

## CPC

- H02G 7/22: Arrangements of earthing wires suspended between mastheads
- H02G 7/205: {Installation of electric cables, extending along a pole}
- H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES

## Abstract

A method for vertically grounding and leading down form an inner side of a composite pole tower and pole tower thereof, wherein the method includes the following steps: extending an upper metal cross arm from an extended line of at least one side of a ground wire cross arm which is made of metal, vertically leading down a ground down-leading wire from a distal end of the upper metal cross arm, connecting the ground down-leading wire to the pole tower via a lower metal cross arm at a distance under a lower lead, and grounding the ground down-leading wire along a tower body of the pole tower, wherein when an lower portion of the tower body is a metal pipe, the ground down-leading wire is selectively directly connected to the metal pipe via the lower metal cross arm. The upper metal cross arm and the lower cross arm are able to provide a distance between the ground down-leading wire and the pole tower. The method enhances the ability of bearing lightning flashover, increases the insulating intensity to lightning impact, and prevents burning to composite insulator by power-flow current after lightning flash over. And also the method is easy and simple for application.

## Claims

### Claim 1

A method for vertically grounding and leading down form an inner side of a composite pole tower, wherein said method comprises the following steps:
extending an upper metal cross arm from an extended line of at least one side of a ground wire cross arm which is made of metal and is positioned on top of said pole tower,
vertically leading down a ground down-leading wire from a distal end of said upper metal cross arm,
connecting said ground down-leading wire to said pole tower via a lower metal cross arm at a distance under a lower lead, and
grounding said ground down-leading wire along a tower body of said pole tower, wherein when an lower portion of said tower body is a metal pipe said ground down-leading wire is selectively directly connected to said metal pipe via said lower metal cross arm, wherein said ground down-leading wires and said tower body are supported therebetween by at least an insulating arm.

### Claim 2

A composite pole tower which grounds from an inner side thereof, comprising:
a tower body,
a ground wire cross arm which is made of metal and is positioned on top of said pole tower,
an upper metal cross arm extended from an extended line of at least one side of said ground wire cross arm,
a ground down-leading wire vertically extended from a distal end of said upper metal cross arm, and
a lower metal cross arm, wherein said around down-leading wire is connected to said pole tower via said lower metal cross arm at a distance under a lower current lead of said pole tower, wherein said ground down-leading wire is grounded along said tower body of said pole tower, wherein when an lower portion of said tower body is a metal pipe, said around down-leading wire is selectively directly connected to said metal pipe via said lower metal cross arm, wherein said ground down-leading wires and said tower body are supported therebetween by at least an insulating arm.

### Claim 3

A composite pole tower which grounds from an inner side thereof, comprising:
a tower body,
a around wire cross arm which is made of metal and is positioned on top of said pole tower,
an upper metal cross arm extended from an extended line of at least one side of said around wire cross arm,
a around down-leading wire vertically extended from a distal end of said upper metal cross arm, and
a lower metal cross arm, wherein said around down-leading wire is connected to said pole tower via said lower metal cross arm at a distance under a lower current lead of said pole tower, wherein said ground down-leading wire is grounded along said tower body of said pole tower, wherein when an lower portion of said tower body is a metal pipe, said ground down-leading wire is selectively directly connected to said metal pipe via said lower metal cross arm, wherein two said upper metal cross arms are symmetrically extended from two sides of the ground wire cross arm respectively in a direction along said current lead thereof, wherein two around down-leading wires are then vertically and symmetrically leaded down, wherein said ground down-leading wires and said tower body are supported therebetween by at least an insulating arm.