JPS54108247A - Static type protective relay - Google Patents

Static type protective relay

Info

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
Application number
JP1414878A
Other languages
Japanese (ja)
Inventor
Yukihiro Kurisu
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP1414878A priority Critical patent/JPS54108247A/en
Publication of JPS54108247A publication Critical patent/JPS54108247A/en
Pending legal-status Critical Current

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
JP1414878A 1978-02-13 1978-02-13 Static type protective relay Pending JPS54108247A (en)

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)

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