Title:
FAULT DETECTION AND PROTECTION METHOD WHEN STARTING ELECTRIC MOTOR MODE OF SYNCHRONOUS GENERATION ELECTRIC MOTOR, AND SYNCHRONOUS GENERATION ELECTRIC MOTOR
Document Type and Number:
Japanese Patent JP3774838
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To detect faults of main circuit, while the electric motor of a generation electric motor has started, so as to protect it.
SOLUTION: When a synchronous electric motor or a synchronous generation electric motor 1b is used as a master machine and a synchronous generation electric motor 1a to be started is used as a slave machine, and both armature coil winding 2a and 2b are connected via a circuit breaker 8 for starting the slave machine by the master machine, physical quantity corresponding to at least one field current of the master and slave machines is detected (21a, 21b, 22a, and 22b), it is detected that a fault has occurred in the main circuit of the master and slave machines when the detection amount of the physical quantity has exceeded a preset range (23a and 23b), field circuit breakers 11a and 11b are opened based on this, and at the same time, switchers 13a and 13b are closed for short-circuiting the field circuit with resistors 14a and 14b and quickly causes a fault current to be attenuated.
Inventors:
Shigehiro Awakawa
Hidenori Sawa
Kiyoshi Oka
Hiroto Nakagawa
Haruki Hagiwara
Hidenori Sawa
Kiyoshi Oka
Hiroto Nakagawa
Haruki Hagiwara
Application Number:
JP22746499A
Publication Date:
May 17, 2006
Filing Date:
August 11, 1999
Export Citation:
Assignee:
株式会社日立製作所
関西電力株式会社
関西電力株式会社
International Classes:
H02H7/06; H02P9/00; (IPC1-7): H02H7/06; H02P9/00
Domestic Patent References:
| JP9093797A | ||||
| JP8308090A |
Attorney, Agent or Firm:
Tatsuyuki Unuma
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