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JPS54119648A - Static type protective relay - Google Patents

Static type protective relay

Info

Publication number
JPS54119648A
JPS54119648A JP2549678A JP2549678A JPS54119648A JP S54119648 A JPS54119648 A JP S54119648A JP 2549678 A JP2549678 A JP 2549678A JP 2549678 A JP2549678 A JP 2549678A JP S54119648 A JPS54119648 A JP S54119648A
Authority
JP
Japan
Prior art keywords
switch
operational amplifier
reference current
matching value
protective relay
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
JP2549678A
Other languages
Japanese (ja)
Inventor
Koji Igarashi
Yuji Oki
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 JP2549678A priority Critical patent/JPS54119648A/en
Publication of JPS54119648A publication Critical patent/JPS54119648A/en
Pending legal-status Critical Current

Links

Landscapes

  • Protection Of Transformers (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To prevent wrong operation, by coupling a level detection circuit to the contact of switch element, which generates the minimum of reference currents, when changing the matching value of a matching circuit.
CONSTITUTION: The input of the protective relay is rectified by a rectifier circuit REC so that a negative signal current I1 is applied to an inverting terminal of an operational amplifier OA. A positive reference current I2 is applied from fixed contacts a, b, c of the switch SW to the inverting terminal of the operational amplifier OA. Both the currents I1, I2 are compared with each other to produce a trip signal. A diode D is connected between a moving contact d of the switch SW and the fixed contact a which supplies the reference current corresponding to the minimum matching value. Thus, the reference current I2 is applied to the operational amplifier OA even if the moving contact d remains disconnected from the fixed contacts a∼c at the time of shifting of the switch SW. This eliminates the wrong operation due to the alteration of the matching value.
COPYRIGHT: (C)1979,JPO&Japio
JP2549678A 1978-03-08 1978-03-08 Static type protective relay Pending JPS54119648A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2549678A JPS54119648A (en) 1978-03-08 1978-03-08 Static type protective relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2549678A JPS54119648A (en) 1978-03-08 1978-03-08 Static type protective relay

Publications (1)

Publication Number Publication Date
JPS54119648A true JPS54119648A (en) 1979-09-17

Family

ID=12167662

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2549678A Pending JPS54119648A (en) 1978-03-08 1978-03-08 Static type protective relay

Country Status (1)

Country Link
JP (1) JPS54119648A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58122063A (en) * 1982-01-13 1983-07-20 Nippon Ranzubaagu Kk Electrostatic coating device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58122063A (en) * 1982-01-13 1983-07-20 Nippon Ranzubaagu Kk Electrostatic coating device
JPH0154102B2 (en) * 1982-01-13 1989-11-16 Gema Ransburg Ag

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