Global patent index - EP 1074999 A1

EP 1074999 A1 2001-02-07 - Hollow core composite insulator

Title (en)

Hollow core composite insulator

Title (de)

Verbundisolator mit Hohlkern

Title (fr)

Isolateur composite à noyau creux

Publication

EP 1074999 A1 (EN)

Application

EP 99115326 A

Priority

EP 99115326 A

Abstract (en)

An improved hollow core composite insulator or bushing for use in, for example, a dead tank circuit breaker, is smaller and lighter and offers other advantages over previous designs. The hollow core insulator includes therein a fiber reinforced plastic (FRP) elongated tube that operates to increase the dielectric constant between a conductor and a transition shield. By placing the transition shield external to the hollow core insulator and providing the FRP tube between the conductor and transition shield, the dielectric constant between the shield and conductor is increased thus allowing the inner diameter of the shield and outer diameter of the insulator to be decreased. In addition, the grounded shield may be an integral part of the flange that is mounted to the bushing current transformer of the dead tank circuit breaker thus further reducing the diameter and overall size of the insulator. <IMAGE>

IPC 1-7 (main, further and additional classification)

H01B 17/28

IPC 8 full level (invention and additional information)

H01B 17/28 (2006.01)

CPC (invention and additional information)

H01B 17/28 (2013.01)

Citation (search report)

Designated contracting state (EPC)

CH DE FR LI SE

EPO simple patent family

EP 1074999 A1 20010207

INPADOC legal status

2004-09-08 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20040302

2001-10-24 [AKX] PAYMENT OF DESIGNATION FEES

- Ref Legal Event Code: AKX

- Free Format Text: CH DE FR LI SE

2001-05-16 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20010319

2001-02-07 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): CH DE FR LI SE

2001-02-07 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Ref Legal Event Code: AX

- Free Format Text: AL;LT;LV;MK;RO;SI