JPS54115745A - Distance relay - Google Patents

Distance relay

Info

Publication number
JPS54115745A
JPS54115745A JP2212278A JP2212278A JPS54115745A JP S54115745 A JPS54115745 A JP S54115745A JP 2212278 A JP2212278 A JP 2212278A JP 2212278 A JP2212278 A JP 2212278A JP S54115745 A JPS54115745 A JP S54115745A
Authority
JP
Japan
Prior art keywords
limiter
voltage
circuit
multiplier
higher harmonics
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
JP2212278A
Other languages
Japanese (ja)
Inventor
Koichi Kimura
Hiroshi Sasaki
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 JP2212278A priority Critical patent/JPS54115745A/en
Publication of JPS54115745A publication Critical patent/JPS54115745A/en
Pending legal-status Critical Current

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  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To reduce the influence of higher harmonics by connecting a limiter circuit and a bandpass filter between the first signal converting circuit for taking the voltage information and a memory and between a substractor and a decision circuit.
CONSTITUTION: Voltage and current informations are taken from the transmission line system to supply the voltage and current signals through the signal converting circuits 1 and 2 to the substractor 3 and the limiter 9. Then the output from the subtractor 3 is cut off at the limiter 8 and supplied through the filter 10 to the multiplier 5. While in the voltage circuit, the signal cut off at the limiter 9 is supplied through the filter 11 and memory 4 to the multiplier 5 to perform the decision of fault. Since the multiplier 5 never operate the higher harmonics lapped over the basic wave, the influence of the higher harmonics can be eliminated.
COPYRIGHT: (C)1979,JPO&Japio
JP2212278A 1978-03-01 1978-03-01 Distance relay Pending JPS54115745A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2212278A JPS54115745A (en) 1978-03-01 1978-03-01 Distance relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2212278A JPS54115745A (en) 1978-03-01 1978-03-01 Distance relay

Publications (1)

Publication Number Publication Date
JPS54115745A true JPS54115745A (en) 1979-09-08

Family

ID=12074067

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2212278A Pending JPS54115745A (en) 1978-03-01 1978-03-01 Distance relay

Country Status (1)

Country Link
JP (1) JPS54115745A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5956817A (en) * 1982-09-22 1984-04-02 三菱電機株式会社 Distance relay
JPS5970121A (en) * 1982-10-13 1984-04-20 三菱電機株式会社 Distance relay
JPS5983531A (en) * 1982-11-01 1984-05-15 三菱電機株式会社 Distance relay

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5956817A (en) * 1982-09-22 1984-04-02 三菱電機株式会社 Distance relay
JPS5970121A (en) * 1982-10-13 1984-04-20 三菱電機株式会社 Distance relay
JPS5983531A (en) * 1982-11-01 1984-05-15 三菱電機株式会社 Distance relay

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