Surge arrester

Patent metadata

Field	Value
Publication number	US-9614370-B2
Application number	US-201314391694-A
Country	US
Kind code	B2
Filing date	Mar 26, 2013
Priority date	Apr 12, 2012
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A surge arrester comprises an electrical insulator ( 10 ), which surrounds a cavity ( 20 ), a pin electrode ( 30 ) and a tube electrode ( 40 ), which are arranged in the cavity ( 20 ), wherein the pin electrode ( 30 ) projects into the tube electrode ( 40 ). An ignition strip ( 50 ) is applied on an inner surface (S 10 a ) of the insulator facing the cavity ( 20 ). An outer metallization ( 61, 62, 63 ) is arranged on an outer surface (S 10 b ) of the insulator ( 10 ). As a result, an effective reduction of the protection level can be achieved in the case of the surge arrester.

First claim

The invention claimed is:

1. A surge arrester, comprising:
an electrical insulator ( 10 ), which surrounds a cavity ( 20 ); and
a pin electrode ( 30 ) and a tube electrode ( 40 ), which are arranged in the cavity ( 20 ), wherein the pin electrode ( 30 ) projects into the tube electrode ( 40 );
wherein at least one ignition strip ( 50 ) is applied on an inner surface (S 10 a ) of the insulator facing the cavity ( 20 ),
wherein an outer metallization ( 61 , 62 , 63 ) is arranged on an outer surface (S 10 b ) the insulator ( 10 ), and
wherein either:
the outer metallization comprises a first section ( 61 ) and a second section ( 62 ), which are arranged in a manner spaced apart at a distance (d a1 ) from one another on the outer surface (S 10 b ) of the insulator ( 10 ), or
a first connection electrode ( 71 ) is connected to the pin electrode ( 30 ) for the purpose of applying a voltage potential, a second connection electrode ( 72 ) is connected to the tube electrode ( 40 ) for the purpose of applying a voltage potential, the outer metallization ( 63 ), proceeding from a first edge (R 1 ) of the outer surface (S 10 b ) of the insulator ( 10 ), said first edge being closer to the first connection electrode ( 71 ) than to the second connection electrode ( 72 ), extends in the direction of a second edge (R 2 ) of the outer surface (S 10 b ) of the insulator, said second edge being opposite the first edge (R 1 ), and is arranged at a distance (d a2 ) from the second edge (R 2 ), wherein the ignition strip ( 50 ) is arranged at a distance (d z2 ) from the second connection electrode ( 72 ), and wherein the distance (d a2 ) between the outer metallization ( 63 ) and the second connection electrode ( 72 ) is shorter than a distance (d z1 ) of the ignition strip ( 50 ) from the first connection electrode ( 71 ).

2. The surge arrester according to claim 1 ,
wherein the insulator ( 10 ) is arranged cylindrically around the cavity ( 20 ),
wherein the outer metallization ( 61 , 62 , 63 ) is arranged in a ring-shaped fashion on the outer surface (S 10 b ) of the insulator ( 10 ).

3. The surge arrester according to claim 1 , wherein the first section ( 61 ) of the outer metallization on the outer surface (S 10 b ) of the insulator ( 10 ), proceeding from a first edge (R 1 ) of the outer surface of the insulator, said first edge facing the first connection electrode ( 71 ), and the second section ( 62 ) of the outer metallization on the outer surface (S 10 b ) of the insulator ( 10 ), proceeding from a second edge (R 2 ) of the outer surface of the insulator, said second edge being arranged opposite the first edge (R 1 ), extend toward one another.

4. The surge arrester according to claim 1 ,
wherein the ignition strip ( 50 ) is arranged at a first distance (dz 1 ) from the first connection electrode ( 71 ),
wherein the length of the first section ( 61 ) of the outer metallization is greater than the first distance (dz 1 ) of the ignition strip ( 50 ),
wherein the ignition strip ( 50 ) is arranged at a second distance (dz 2 ) from the second connection electrode ( 72 ),
wherein the length of the second section ( 62 ) of the outer metallization is greater than the second distance (dz 2 ) of the ignition strip ( 50 ).

5. The surge arrester according to claim 1 , wherein the distance (da 1 ) between the first and second sections ( 61 , 62 ) of the outer metallization is at least of the same magnitude as double the product of the distance (di) between the pin electrode ( 30 ) and the tube electrode ( 40 ) and the quotient of the internal pressure (pi) of a filling gas in the cavity ( 20 ) and the external atmospheric pressure (pa) of the surroundings of the surge arrester.

6. The surge arrester according to claim 1 , wherein the first section ( 61 ) of the outer metallization is connected to the first connection electrode ( 71 ) and the second section ( 62 ) of the outer metallization is connected to the second connection electrode ( 72 ).

7. The surge arrester according to claim 1 , wherein the outer metallization ( 63 ) is connected to the first connection electrode ( 71 ) and is arranged in a manner spaced apart from the second connection electrode ( 72 ) by the distance (da 2 ).

8. The surge arrester according to claim 1 , wherein the distance (da 2 ) between the outer metallization ( 63 ) and the second connection electrode ( 72 ) is at least of the same magnitude as double the product of the distance (di) between the pin electrode ( 30 ) and the tube electrode ( 40 ) and the quotient of the internal pressure (pi) of a filling gas ( 80 ) in the cavity ( 20 ) and the external atmospheric pressure (pa) of the surroundings of the surge arrester.

Assignees

• Epcos Ag

Inventors

• Daeumer Wolfgang
• Werner Frank
• Soelter Eberhard

Classifications

• H01B3/12

  ceramics · CPC title

• H01T4/12

  hermetically sealed · CPC title

• H02H1/04

  Arrangements for preventing response to transient abnormal conditions, e.g. to lightning {or to short duration over voltage or oscillations; Damping the influence of DC component by short circuits in AC networks} · CPC title

• H01T1/20 Primary

  Means for starting arc or facilitating ignition of spark gap · CPC title

• H02H9/06 Primary

  using spark-gap arresters · CPC title