Stephen C Phelps

US Patent:

47915293, Dec 13, 1988

Filed:

May 1, 1987

Appl. No.:

7/045923

Inventors:

George I. Duncan - Glenview IL
Stephen L. Phelps - Chicago IL

Assignee:

Advance Transformer Company - New York NY

International Classification:

H01G 108
H01G 111

US Classification:

361274

Abstract:

A protective system to prevent a dry metallized film capacitor from rupturing its case or catching fire in the event that an internal short or fault occurs within the capacitor section utilizes a fuse and a thermal protector connected in series with the capacitor section and within its case. The fuse serves to protect the unit from a fault-induced low resistance high current in-rush, while the thermal protector is triggered by a fault-induced high resistance low current. A heat reflective circumferential sheet and the positioning of thermal protector maximize its value in the protective system.

US Patent:

D3505324, Sep 13, 1994

Filed:

Jul 24, 1991

Appl. No.:

7/735123

Inventors:

Stephen L. Phelps - Chicago IL

Assignee:

Landis & Gyr Powers, Inc. - Buffalo Grove IL

US Classification:

D13184

US Patent:

47149795, Dec 22, 1987

Filed:

Dec 16, 1986

Appl. No.:

6/943478

Inventors:

George I. Duncan - Glenview IL
Stephen L. Phelps - Chicago IL

Assignee:

Advance Transformer Company - Chicago IL

International Classification:

H01G 440

US Classification:

361274

Abstract:

A protective system to prevent a dry metallized film capacitor from exploding or catching fire in the event that an internal short or fault occurs within the capacitor section utilizes a fuse and a thermal protector connected in series with the capacitor section and within its case. The fuse serves to protect the unit from a fault-induced low resistance high current in-rush, while the thermal protector is triggered by a fault-induced high resistance low current. A heat reflective circumferential sheet and positioning of thermal protector maximize its value in the protective system.