Multi-phase electronic temperature controller

Details Multi-phase electronic temperature controller Multi-phase electronic temperature controller

1986-12-12

1988-10-04

Yasich, Daniel M.

Thermal measuring and testing

Temperature measurement

In spaced noncontact relationship to specimen

738659, 374152, G01K 102, G01K 1300

Patent

active

047752459

ABSTRACT:
A method and system is provided for electronically simulating, indicating and controlling the temperature of liquid cooled multi-phase electric power transformers. The temperatures of transformer windings are electronically computed from the actual top oil temperature and the computed incremental additional temperatures resulting from the transformer winding currents to determine the hottest spot temperature. The signals representative of the winding current for each phase of the multi-phase transformer are time processed to simulate the rate of rise of winding temperature resulting from those currents. A square-law function is generated to make a winding bias parameter for each winding. The signals representative of the actual and incremental additional temperature are added for each transformer phase and the largest signal, representative of the hottest winding is used to indicate and control the transformer temperature.

REFERENCES:
patent: 2834920 (1958-05-01), Lennox et al.
patent: 3144770 (1964-08-01), Sheely
patent: 3148349 (1964-09-01), Rose et al.
patent: 3289478 (1966-12-01), Tokunaga et al.
patent: 4258570 (1981-03-01), Weiler
"Automated Transformer Temperature Rise Tester", A. L. Sandeen et al., IBM Technical Disclosure Bulletin, vol. 22, No. 6 (11/1979).
"Electronics Circuits Discrete & Integrated", by Donald L. Schilling and Charles Belove, pp. 42-49, (Diode Circuit Analysis) McGraw Hill Co., 1968.

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