# US 10,504,639 B2 · Overvoltage arrester

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- Number: US 10,504,639 B2
- Document ID: US10504639B2
- Status: Granted
- Kind: B2
- Application number: 15/268,780
- Filed: 2016-09-19
- Published: 2017-03-23
- Granted: 2019-12-10
- Earliest claimed: 2015-09-18
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: Alexander Bockarev; Bastian Robben; Henrik Roggow; Markus Sulitze
- Web page: https://patentgrep.com/patent/US10504639B2

## CPC

- H01C 7/12: Overvoltage protection resistors; Arresters
- H01C 1/01: Mounting; Supporting
- H01C: RESISTORS

## Abstract

Overvoltage arresters are used to protect against overvoltages in electrical energy transmission systems. An overvoltage arrester has a discharge column which extends along a longitudinal axis and is clamped in between end fittings by a plurality of tensile elements which radially surround the discharge column and are secured in the end fittings. At least one of the end fittings has a first thread for attaching a connecting bolt. Furthermore, the end fitting has a fitting body with a second thread for receiving a pressure screw for generating an axial force on the discharge column. Accordingly the first and second threads overlap along an axial section.

## Claims

### Claim 1

An overvoltage arrester, comprising:
end fittings;
a plurality of tensile elements;
a discharge column extending along a longitudinal axis and clamped in between said end fittings by means of said plurality of tensile elements radially surrounding said discharge column and secured in said end fittings; and
at least one of said end fittings having a pressure screw, a first thread for attaching to a connecting bolt and a fitting body with a second thread for receiving said pressure screw for generating an axial force on said discharge column, said first and second threads overlapping along an axial section;
said first thread disposed in said fitting body;
said pressure screw embodied in a manner of a pot having a base which points toward said discharge column and a side wall extending away from said base and enclosing a hollow interior space; and
said fitting body having an axial depression formed therein and said second thread extending into said axial depression.

### Claim 2 (depends on 1)

The overvoltage arrester according to claim 1, wherein said first and second threads are disposed coaxially with respect to one another and with respect to the longitudinal axis.

### Claim 3 (depends on 1)

The overvoltage arrester according to claim 1, wherein said base has a tool receptacle for receiving a screwing tool.

### Claim 4 (depends on 1)

The overvoltage arrester according to claim 1, wherein said pressure screw has injection openings for injecting sealing compound into the hollow interior space.

### Claim 5 (depends on 1)

The overvoltage arrester according to claim 1, wherein said second thread is an internal thread and said pressure screw has a corresponding external thread on a side wall.