Title:
OVERVOLTAGE PROTECTING RELAY UNIT
Document Type and Number:
Japanese Patent JPS5921220
Kind Code:
A
Abstract:
A device for protecting from an overvoltage a power apparatus constituting an electric power system. The device comprises a plurality of detector means having respectively different voltage detection regions so as to attain preferably protection characteristic corresponding to the characteristic curve of the voltage-and-time product permissible for the power apparatus, a plurality of timer means for checking whether the durations of the outputs of the detector means exceed a respective predetermined time periods, and logic means for combining the respective outputs of the timer means through a predetermined logic operation.
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Inventors:
MURATA MASANORI
Application Number:
JP13002682A
Publication Date:
February 03, 1984
Filing Date:
July 24, 1982
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H02H7/04; H02H3/20; (IPC1-7): H02H3/20; H02H7/04
Attorney, Agent or Firm:
Shinichi Kusano