H - Electricity – 02 – H
Patent
H - Electricity
02
H
318/106, 318/78
H02H 7/08 (2006.01)
Patent
CA 1070757
FIELD OVERVOLTAGE PROTECTING APPARATUS FOR SYNCHRONOUS MACHINE Abstract of the Disclosure An apparatus for protecting a synchronous machine from a field overvoltage is disclosed. The apparatus comprises a field excitation control circuit which is impressed with the armature voltage of the synchronous machine so as to provide a DC power supply for producing a DC output to excite the field winding of the synchronous machine, a first discharge circuit which is adapted to discharge the stored energy of the field winding when the synchronous machine is to be tripped under predeter- mined conditions, and a second discharge circuit for reducing the field voltage by allowing a field current to flow therethrough in response to generation of an overvoltage whose absolute value is higher than a pre- determined level, across the field winding. The resistance of the second discharge circuit is selected to be higher than that of the first discharge circuit so that even in the presence of an overvoltage across the field winding, the overvoltage is suppressed by the second discharge circuit thereby to prevent frequent tripping of the synchronous machine due to overvoltage.
274887
Goto Masuo
Matuzaki Takeshi
Momochi Yasushi
Hitachi Ltd.
Na
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