Electricity: power supply or regulation systems – For reactive power control – Using converter
Patent
1996-01-26
1997-04-01
Krishnan, Aditya
Electricity: power supply or regulation systems
For reactive power control
Using converter
H02H 7125
Patent
active
056170122
ABSTRACT:
A power converter protecting apparatus include series transformers connected in series to phase power lines, respectively, of an electric power system, power converters connected to secondary windings of the transformers, respectively, a current detector for detecting system currents flowing through the phase power lines, a current detector for detecting converter currents flowing to the power converters from the secondary windings, respectively, a high-speed decision circuit for outputting a decision signal upon determination of occurrence of a system fault on the basis of the system current, a switch for issuing an output voltage zero command upon reception of the fault decision signal, and a pulse generating circuit for controlling a gate pulse signal supplied to the power converters for setting to zero the outputs of the power converters in response to the output voltage zero command at a time point when the converter current decreases below an allowable breaking current thereof.
REFERENCES:
patent: 5309346 (1994-05-01), Gyugyi
Krishnan Aditya
Mitsubishi Denki & Kabushiki Kaisha
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