JPS54113046A - Transformer protective relay - Google Patents

Transformer protective relay

Info

Publication number
JPS54113046A
JPS54113046A JP1968878A JP1968878A JPS54113046A JP S54113046 A JPS54113046 A JP S54113046A JP 1968878 A JP1968878 A JP 1968878A JP 1968878 A JP1968878 A JP 1968878A JP S54113046 A JPS54113046 A JP S54113046A
Authority
JP
Japan
Prior art keywords
current
relay
higher harmonic
output
detecting
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
JP1968878A
Other languages
Japanese (ja)
Inventor
Hiroshi Sasaki
Koichi Kimura
Eizaburo Sako
Junichi Makino
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 JP1968878A priority Critical patent/JPS54113046A/en
Publication of JPS54113046A publication Critical patent/JPS54113046A/en
Pending legal-status Critical Current

Links

Landscapes

  • Protection Of Transformers (AREA)

Abstract

PURPOSE: To prevent the mal-operation of current differential relay the input of which is the primary side inout current waveform and the secondary side output current waveform of transformer by providing a basic wave component notch circuit by which to remove basic wave component at the secondary higher harmonic component content detecting circuit.
CONSTITUTION: The differential relay 4, input of which is the output of the current transformers 2P and 2S, detects the difference between the outputs of 2P and 2S which is, if any, more than a predetermined value and then put into operation. The higher harmonic detecting relay 5, which has so far been known as a means of detecting the exciting rush current of the high tension machine 1, locks the output of the differential relay 4 at the coincidence gate 6 in case where the secondary higher harmonic component of current differential output drawn out of current transformers 2P and 2S exceeds a predetermined value. The coincidence gate 6 sends out a breaking allowable signal for the breakers 3P and 3S only by working signal for both differential relay 4 and the higher harmonic detecting relay 5.
COPYRIGHT: (C)1979,JPO&Japio
JP1968878A 1978-02-24 1978-02-24 Transformer protective relay Pending JPS54113046A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1968878A JPS54113046A (en) 1978-02-24 1978-02-24 Transformer protective relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1968878A JPS54113046A (en) 1978-02-24 1978-02-24 Transformer protective relay

Publications (1)

Publication Number Publication Date
JPS54113046A true JPS54113046A (en) 1979-09-04

Family

ID=12006172

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1968878A Pending JPS54113046A (en) 1978-02-24 1978-02-24 Transformer protective relay

Country Status (1)

Country Link
JP (1) JPS54113046A (en)

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