JPS54140130A - Abnormality detection device of frequency converter - Google Patents

Abnormality detection device of frequency converter

Info

Publication number
JPS54140130A
JPS54140130A JP4659478A JP4659478A JPS54140130A JP S54140130 A JPS54140130 A JP S54140130A JP 4659478 A JP4659478 A JP 4659478A JP 4659478 A JP4659478 A JP 4659478A JP S54140130 A JPS54140130 A JP S54140130A
Authority
JP
Japan
Prior art keywords
electric current
current
circuit
dropped
trouble
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
JP4659478A
Other languages
Japanese (ja)
Inventor
Hiroshi Sugisaka
Takeshi Okuyama
Tsuyoshi Mizoguchi
Noboru Azusawa
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 JP4659478A priority Critical patent/JPS54140130A/en
Publication of JPS54140130A publication Critical patent/JPS54140130A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To enable to detect short-circuit trouble in direct current circuit, regardless of set value of electric current limitation level, by detecting short-circuit trouble with ratio of alternating current side current of both thyristor converters.
CONSTITUTION: If short-circuit trouble is occured at a time, electric current which is currented from electric source side through thyristor converter 1 is detected by ACCT19, and since electric current is limited by electric current limiting circuit 5, (a) electric current is constant, but since direct current input voltage of thyristor converter device 2 is dropped to nearly zero, the alternating current side current is dropped such as (b). Therefore, divider output (I2/I1) is reapidly dropped, so as to be shown in (c), it is out of normal time, and lower limit comparator 202 generates output. From this, electric current ratio abnormality detector 104 generates output signal (h). That is:- a trouble is detected, and suitable gate operation can be done through protective logic 105.
COPYRIGHT: (C)1979,JPO&Japio
JP4659478A 1978-04-21 1978-04-21 Abnormality detection device of frequency converter Pending JPS54140130A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4659478A JPS54140130A (en) 1978-04-21 1978-04-21 Abnormality detection device of frequency converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4659478A JPS54140130A (en) 1978-04-21 1978-04-21 Abnormality detection device of frequency converter

Publications (1)

Publication Number Publication Date
JPS54140130A true JPS54140130A (en) 1979-10-31

Family

ID=12751615

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4659478A Pending JPS54140130A (en) 1978-04-21 1978-04-21 Abnormality detection device of frequency converter

Country Status (1)

Country Link
JP (1) JPS54140130A (en)

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