JPS54159648A - Protection circuit for electric apparatus - Google Patents

Protection circuit for electric apparatus

Info

Publication number
JPS54159648A
JPS54159648A JP6829378A JP6829378A JPS54159648A JP S54159648 A JPS54159648 A JP S54159648A JP 6829378 A JP6829378 A JP 6829378A JP 6829378 A JP6829378 A JP 6829378A JP S54159648 A JPS54159648 A JP S54159648A
Authority
JP
Japan
Prior art keywords
current
breaker
overcurrent
electric apparatus
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6829378A
Other languages
Japanese (ja)
Inventor
Shigetoshi Okamatsu
Takashi Tsuboi
Shozo Yamazaki
Hiroshi Narita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6829378A priority Critical patent/JPS54159648A/en
Publication of JPS54159648A publication Critical patent/JPS54159648A/en
Pending legal-status Critical Current

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  • Protection Of Static Devices (AREA)

Abstract

PURPOSE: To protect from overcurrent electric apparatus supplied with power from DC power source through the first and second breakers by inserting current-limiting resistor in parallel into a series circuit for the first breaker and electric apparatus.
CONSTITUTION: DC current from the line 1 is supplied through the second breaker 3 and the filter reactor 7 to a circuit in which a series circuit for the current-limiting resistor 6 and the current-limiting switch 18 is connected in parallel with a series circuit for the first breaker 4 and the inverter 11. Thus, when overcurrent flows due to failure of the commutation of the inverter 11, the current time product of current flowing in thyristor can be reduced by opening the first breaker 4, connecting the time-limiting switch 18 at the same time to attenuate overcurrent, and then opening the second breaker 3, permitting the accurate protection of thyristor and also the utilization of the time-limiting resistor 6 as an overcurrent resistor.
COPYRIGHT: (C)1979,JPO&Japio
JP6829378A 1978-06-08 1978-06-08 Protection circuit for electric apparatus Pending JPS54159648A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6829378A JPS54159648A (en) 1978-06-08 1978-06-08 Protection circuit for electric apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6829378A JPS54159648A (en) 1978-06-08 1978-06-08 Protection circuit for electric apparatus

Publications (1)

Publication Number Publication Date
JPS54159648A true JPS54159648A (en) 1979-12-17

Family

ID=13369577

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6829378A Pending JPS54159648A (en) 1978-06-08 1978-06-08 Protection circuit for electric apparatus

Country Status (1)

Country Link
JP (1) JPS54159648A (en)

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