Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-07-21
1996-07-09
Swarthout, Brent A.
Communications: electrical
Condition responsive indicating system
Specific condition
340635, 340624, 340626, 340664, 340691, 324726, 361 37, 73305, G08B 2100
Patent
active
055348530
DESCRIPTION:
BRIEF SUMMARY
The oil transformer technology is more and more efficient and requires an adequate protection against the risk of damage and destruction due to a running trouble. Present means of monitoring and protecting oil transformer consist in mechanical or electrical instruments, without a data storage, without a systematic control of an alarm or of a stop system, monitoring several running parameters without any precise measure.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is better understood by reading the following Detailed Description of the Preferred Embodiments with reference to the accompanying drawing figures, in which like reference numerals refer to like elements throughout, and in which:
FIG. 1 is a perspective view, partially in cross-section, of electronic apparatus in accordance with the present invention.
FIG. 2 is a diagrammatic view of the upper and lower parts of the apparatus in association with a transformer.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The present invention relates to an electronic apparatus composed of a single element comprising all the functions of measure, memorization, display alarm and stop tripping of four running parameters of the oil transformer.
The measures of the value of the running parameters are real and continuous measures over 24 hours.
The apparatus continuously and simultaneously measures over 24 hours the values of the temperature and of the level of the dielectric fluid contained in the transformer, the value of the pressure inside the transformer and of the current-strength at the transformer secondary thanks to independent equipments connected to an electronic system (1) and running permanently, the apparatus being fed by the transformer that receives it, or by its control cabinet.
The temperature of the dielectric liquid contained in the transformer is measured with a precision of .+-.0.5.degree. C. thanks to an electronic sensor (2) located at the end of a vertical printed circuit board (3) attached under the base of the removable upper part (4) of the apparatus and penetrating to 30 mm under the inner wall (5) of the transformer. This location of the sensor, near by the hottest area of the transformer, allowing thus an optimal measure of the dielectric liquid temperature, is made possible thanks to the plastic composing the body of the apparatus that ensures its thermal and electrical insulation, and thanks to the weak penetration of the lower part of the apparatus, under the clamps (6) inside the transformer.
The pressure inside the transformer is measured with a precision of .+-.0.02 bar thanks to an electronic sensor (7) attached under the base of the upper part (4) of the apparatus and located in the lower part (8) of the apparatus-that communicates with the inside of the transformer.
The dielectric fluid level inside the transformer is measured with a precision of 5 cm.sup.3 and is given in percentage of the volume contained in the lower part (8)-of the apparatus thanks to electronic sensors (9) located on the vertical printed circuit board (3) and actuated by a magnet (10) sunk in a float (11) sliding around the vertical printed circuit board (3), the whole being located in the lower part (8) of the apparatus, which is transparent and is used as a dielectric fluid reservoir, because of its communication with the inside of the transformer.
With this measure of the dielectric level is associated a measure of the level variation speed, from the measure of the time passed between two successive positions of the float, thanks to an electronic clock located in the electronic system (1) allowing thus to measure rapid variations of level due to a gas development in the transformer or to a leak of dielectric fluid.
The current-strength at the secondary of the transformer is measured thanks to a current transformer (12 ) surrounding the secondary terminals (13) and solid with the low-voltage bushing (rectangular type or other) of the transformer to be controlled.
With this measure of the current-strength is associated an electronic measure of
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patent: 4823224 (1989-04-01), Hagerman et al.
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Pioch S.A.
Swarthout Brent A.
Wu Daniel J.
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