Modular electronic temperature controller

Details Modular electronic temperature controller Modular electronic temperature controller

1985-08-30

1988-05-17

Lall, Parshotam S.

Boots, shoes, and leggings

364571, 361 37, 374152, 340646, G01K 1720, G01K 112, G06F 1556

Patent

active

047455713

ABSTRACT:
A method and system for controlling the temperature of liquid cooled power transformers. The winding temperature of a transformer winding is electronically computed from the actual top oil temperature and the incremental additional temperature resulting from transformer load current. One curve from a family of curves representing the incremental temperature for various transformers may be selected or calibrated by adjustments made which simulate the incremental additional temperature which results from transformer winding current. The total temperature value resulting from the addition of both the top oil temperature and the incremental temperature are used to control indicators, cooling fans, circuit trips and retain an indication of the highest temperature occuring during the time period of interest.

REFERENCES:
patent: 3849705 (1974-11-01), McElroy
patent: 4623265 (1986-11-01), Poyser
C. F. Book, Electrical Engineering, 1/52, p. 82, vol. 71.

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