JPS54101143A - Protective relay - Google Patents

Protective relay

Info

Publication number
JPS54101143A
JPS54101143A JP793678A JP793678A JPS54101143A JP S54101143 A JPS54101143 A JP S54101143A JP 793678 A JP793678 A JP 793678A JP 793678 A JP793678 A JP 793678A JP S54101143 A JPS54101143 A JP S54101143A
Authority
JP
Japan
Prior art keywords
change
frequency
stabilizing
measure
detected
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
JP793678A
Other languages
Japanese (ja)
Inventor
Akiyoshi Honma
Yukitoshi Sakai
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 JP793678A priority Critical patent/JPS54101143A/en
Publication of JPS54101143A publication Critical patent/JPS54101143A/en
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To permit quick detection of a change of the frequency of the system at the time of occurrence of such a change so as to detect a trouble causing such a change for permitting a measure for stabilizing the system to be taken.
CONSTITUTION: A frequency change is detected by sampling the voltage of the systems N time each for one period of the fundamental frequency, converting the sampled values into N digital values and determining whether the value obtained by successively adding the N sampled values is zero or not. When a frequency change is detected, th system is determined to be in trouble, and a measure for stabilizing the system is taken up.
COPYRIGHT: (C)1979,JPO&Japio
JP793678A 1978-01-26 1978-01-26 Protective relay Pending JPS54101143A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP793678A JPS54101143A (en) 1978-01-26 1978-01-26 Protective relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP793678A JPS54101143A (en) 1978-01-26 1978-01-26 Protective relay

Publications (1)

Publication Number Publication Date
JPS54101143A true JPS54101143A (en) 1979-08-09

Family

ID=11679389

Family Applications (1)

Application Number Title Priority Date Filing Date
JP793678A Pending JPS54101143A (en) 1978-01-26 1978-01-26 Protective relay

Country Status (1)

Country Link
JP (1) JPS54101143A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6314378B1 (en) 1996-04-01 2001-11-06 Clc Global Llc Distributed frequency relay

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6314378B1 (en) 1996-04-01 2001-11-06 Clc Global Llc Distributed frequency relay

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