Electrical safety device with conductive polymer sensor

Details Electrical safety device with conductive polymer sensor Electrical safety device with conductive polymer sensor

1998-06-02

1999-01-19

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361106, 219494, H02H 504

Patent

active

058620303

ABSTRACT:
An electrical safety device comprises a sensor strip disposed in the insulation of a wire or in the insulation of a sheath enclosing a bundle of insulated electrical conductors. The sensor strip comprises a distributed overtemperature sensing portion comprising a conductive polymer having a positive temperature coefficient of resistivity which increases with temperature sufficient to result in a switching temperature. A mechanical damage sensing portion comprises a strip disposed in the sheath in a mechanical damage sensing pattern which becomes damaged or open upon mechanical damage of the sheath before the bundle of conductors are damaged. The overtemperature sensing portion and the mechanical damage sensing portion may be the same sensing strip disposed in the sheath and arranged in a helical relationship with a longitudinal axis of the sheath.

REFERENCES:
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patent: 4577094 (1986-03-01), Mills
patent: 4668857 (1987-05-01), Smucker
patent: 4891500 (1990-01-01), Bloore
patent: 5143649 (1992-09-01), Blackledge et al.
patent: 5424895 (1995-06-01), Gaston
patent: 5541803 (1996-07-01), Pope, Jr. et al.
patent: 5554679 (1996-09-01), Cheng

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