JPS54108247A - Static type protective relay - Google Patents
Static type protective relayInfo
- Publication number
- JPS54108247A JPS54108247A JP1414878A JP1414878A JPS54108247A JP S54108247 A JPS54108247 A JP S54108247A JP 1414878 A JP1414878 A JP 1414878A JP 1414878 A JP1414878 A JP 1414878A JP S54108247 A JPS54108247 A JP S54108247A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- output
- nand gate
- inputs
- gate
- 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
- Emergency Protection Circuit Devices (AREA)
Abstract
PURPOSE: To prevent error operation of phase shortage element, by using exclusive theoretical sum circuit as phase shortage detecting element and eliminating level variation due to existence of three phase electric current.
CONSTITUTION: Excusive theoretical sum circuits 10,20 are connected to each electric potential detecting circuit of nodes U2-W2 in V shape, and it is composed such that signal is issued only when load is shortage of phase. For example, when only U phase is short, electric potential of U2 is V2 in L level, and W2 is H level. Therefore, since input of gate 10 is L and H, the output is H. On the other hand, output of gate 20 is L, because inputs are H,H. Electric potential at A point is H, because another two phases are over 85% of rated current. Therefore, since inputs are H,H, output of NAND gate 30 is L. Output of NAND gate 40 is H, because inputs are H,L. Accordingly, output of NAND gate 50 is H, and it is phase shortage detecting state. And so forth, if another phase is short, NAND gate 50 outputs H signal.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1414878A JPS54108247A (en) | 1978-02-13 | 1978-02-13 | Static type protective relay |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1414878A JPS54108247A (en) | 1978-02-13 | 1978-02-13 | Static type protective relay |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54108247A true JPS54108247A (en) | 1979-08-24 |
Family
ID=11853057
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1414878A Pending JPS54108247A (en) | 1978-02-13 | 1978-02-13 | Static type protective relay |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54108247A (en) |
-
1978
- 1978-02-13 JP JP1414878A patent/JPS54108247A/en active Pending
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