JPS54140130A - Abnormality detection device of frequency converter - Google Patents
Abnormality detection device of frequency converterInfo
- 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
Links
Landscapes
- Ac-Ac Conversion (AREA)
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
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) |
-
1978
- 1978-04-21 JP JP4659478A patent/JPS54140130A/en active Pending
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