Transformer protection system

Details Transformer protection system Transformer protection system

1986-10-14

1988-09-20

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 80, 340646, H02H 7045

Patent

active

047729783

ABSTRACT:
In a transformer protection system, data of voltages and currents detected at individual terminals of a transformer connected to an electric power system are supplied to a computer. The computer computes driving point admittances or shunt admittances of the transformer on the basis of the voltage and current data and predetermined transfer admittances of the transformer and decides that an internal fault has occurred in the transformer when the values of the driving point admittances or shunt admittances deviate from pre-set reference values, thereby disconnecting the transformer from the electric power system.

REFERENCES:
patent: 4377833 (1983-03-01), Udren
"Digital Protection Method for Power Transformers Based on an Equivalent Circuit Composed of Inverse Inductance", by Inagaki et al., IEEE, 1987.
"A New Technique for H-speed Transformer Fault Protection . . . ", by Sykes, IEEE, 9th-11th Jul., 1972, pp. 1-7.

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