Temperature indicator for electrical equipment

Abstract

A system for determining when an electrical contact or other component reaches a predetermined temperature. In operation, a trace material is dispersed into a surrounding environment (e.g., head space within a compartment above insulating oil), where the trace material is detected. A barrier may be ruptured or broken by temperature-induced gas pressure, or pierced by a spring-loaded member that is located within the same section that contains the trace material, and devices may be provided for moving the trace material through the foil barrier as the barrier is ruptured. The barrier may be opened solely by internal gas pressure. According to another embodiment, improved fail-safe operation may be achieved by providing a spring-loaded member and configuring the barrier to be ruptured by the pressure of the detectable gas material before the barrier is ruptured by the spring-loaded member.

1 . A device for responding to temperature of an electrical component, comprising:
 detectable material;   a first section containing the detectable material; and   a cover for maintaining the detectable material within the first section; and   wherein the device is configured to open the cover and thereby release the detectable material from the first section in response to the temperature of the electrical component increasing to a predetermined temperature, and thereby generate an indicator light.