Device for protecting a braking resistor for locomotives

Details Device for protecting a braking resistor for locomotives Device for protecting a braking resistor for locomotives

1999-03-31

2000-10-31

Ballato, Josie

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 24, 318362, H02H 7085, B60L 300

Patent

active

06141199&

ABSTRACT:
A device for protecting a braking resistor for locomotives supplied with AC power obtained by chopping the DC voltage from the power grid comprising at least one pack of resistive components of the resistor which has at least one reference resistive component which is made of a different material than the other resistive components of the pack but is suitable to react thermally in the same manner as the other resistive components of the pack when it is crossed by the same current, and a control circuit which is associated with the pack of resistive components and is suitable to detect their temperature by detecting the variations in the electrical characteristics of the reference resistive component.

REFERENCES:
patent: 4035692 (1977-07-01), Luy et al.
patent: 4179646 (1979-12-01), Russell
patent: 5208741 (1993-05-01), Kumar
patent: 5449992 (1995-09-01), Geiger et al.

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