JPS5456149A - Phase comparison carrier protective relay unit - Google Patents

Phase comparison carrier protective relay unit

Info

Publication number
JPS5456149A
JPS5456149A JP12276977A JP12276977A JPS5456149A JP S5456149 A JPS5456149 A JP S5456149A JP 12276977 A JP12276977 A JP 12276977A JP 12276977 A JP12276977 A JP 12276977A JP S5456149 A JPS5456149 A JP S5456149A
Authority
JP
Japan
Prior art keywords
failure
relay
phase comparison
operates
circuit
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
JP12276977A
Other languages
Japanese (ja)
Inventor
Shinichi Azuma
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP12276977A priority Critical patent/JPS5456149A/en
Publication of JPS5456149A publication Critical patent/JPS5456149A/en
Pending legal-status Critical Current

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  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To permit a phase comparison relay to operate and make this allowable time be inversely proportional to the size of failure current by operating a failure detection relay or obtain an accurate operation by controlling the allowable time in a contrary direction of the size of failure current in stages.
CONSTITUTION: At system failure a failure detection relay 8A operates. While an inverse time limit characteristic and overcurrent relay 7A operates, an output signal is generated in an AND circuit 9A and a trip circuit 6A is energized by operating an internal failure phase comparison relay. On the other hand, after the inverse time limit characteristic and overcurrent relay 7A operates at external failure, the operation of the AND circuit 9A is locked by an inhibit gate 91A. Even when a phase comparison relay operates due to transient phenomena after the external failure is removed, mistripping does not occur
COPYRIGHT: (C)1979,JPO&Japio
JP12276977A 1977-10-12 1977-10-12 Phase comparison carrier protective relay unit Pending JPS5456149A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12276977A JPS5456149A (en) 1977-10-12 1977-10-12 Phase comparison carrier protective relay unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12276977A JPS5456149A (en) 1977-10-12 1977-10-12 Phase comparison carrier protective relay unit

Publications (1)

Publication Number Publication Date
JPS5456149A true JPS5456149A (en) 1979-05-04

Family

ID=14844150

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12276977A Pending JPS5456149A (en) 1977-10-12 1977-10-12 Phase comparison carrier protective relay unit

Country Status (1)

Country Link
JP (1) JPS5456149A (en)

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