Transformer hot spot detection system

Details Transformer hot spot detection system Transformer hot spot detection system

1976-05-03

1979-02-20

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

73350, 331 66, 340208, 340310R, G08C 1912

Patent

active

041409990

ABSTRACT:
The invention is a system for the detection of hot spots, i.e., localized over-heating, in electrical power transformers and the like which utilize one or more telemetric temperature devices that are embedded at preselected locations in the windings of the transformer and that utilize a coil about the windings to obtain an induced voltage power supply that is rectified and drives an oscillator circuit of the device. The oscillator circuit includes a temperature responsive component that varies the frequency of the oscillator output in response to the local, sensed temperature. The output of the oscillator circuit is coupled to a telemetering facility to broadcast by electromagnetic or ultrasonic radiation the temperature-altered signal to a remote receiver, whereby the telemetric temperature device is isolated and "floats" on the voltage potential of the windings at its location.

REFERENCES:
patent: 2625821 (1953-01-01), Stein
patent: 3297913 (1967-01-01), Schweitzer
patent: 3519924 (1970-07-01), Burton
patent: 3801970 (1974-04-01), Barnes
patent: 3849705 (1974-11-01), McElroy
patent: 3855503 (1974-12-01), Ristuccia
patent: 3872455 (1975-03-01), Fuller et al.
patent: 3960017 (1976-06-01), Romanowski

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