JPH0458714A - Digital protective relay device - Google Patents

Digital protective relay device

Info

Publication number
JPH0458714A
JPH0458714A JP16636090A JP16636090A JPH0458714A JP H0458714 A JPH0458714 A JP H0458714A JP 16636090 A JP16636090 A JP 16636090A JP 16636090 A JP16636090 A JP 16636090A JP H0458714 A JPH0458714 A JP H0458714A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
frequency
sampling
power system
correcting
current
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
JP16636090A
Inventor
Ritsu Edasawa
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

Links

Abstract

PURPOSE: To accurately calculate the amplitude value of a power system which is an object to be protected even when the current frequency of the power system deviates from a reference frequency by detecting the deviation between the current frequency and the reference frequency and correcting a sampling frequency with a frequency correcting device so that the sampling frequency can become an integer multiple of the current frequency of the power system.
CONSTITUTION: A frequency correcting device 14 fetches sine wave data by performing a software process and delivers a correcting signal which is proportional to the difference ▵t between a reference frequency f0 and the current frequency f1 of a power system deviating from the reference frequency f0 to a clock signal generation circuit 15. The circuit 15 corrects a sampling frequency on the basis of the correcting signal and delivers sampling pulses to sampling holders 7 and 8 at intervals T2/3 (at an electrical angle of 30° against the current frequency f1 of the system). The interval between X0 and X2 of the data successively sampled by the holders 7 and 8 corresponds to an electrical angle of 90°.
COPYRIGHT: (C)1992,JPO&Japio
JP16636090A 1990-06-25 1990-06-25 Digital protective relay device Pending JPH0458714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16636090A JPH0458714A (en) 1990-06-25 1990-06-25 Digital protective relay device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16636090A JPH0458714A (en) 1990-06-25 1990-06-25 Digital protective relay device

Publications (1)

Publication Number Publication Date
JPH0458714A true true JPH0458714A (en) 1992-02-25

Family

ID=15829948

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16636090A Pending JPH0458714A (en) 1990-06-25 1990-06-25 Digital protective relay device

Country Status (1)

Country Link
JP (1) JPH0458714A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999054976A1 (en) * 1998-04-21 1999-10-28 Abb Substation Automation Oy Method for adapting a protective relay to the mains frequency, and a protective relay
WO2000069042A1 (en) * 1999-05-05 2000-11-16 General Electric Company Adaptive sampling rate based on power system frequency

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999054976A1 (en) * 1998-04-21 1999-10-28 Abb Substation Automation Oy Method for adapting a protective relay to the mains frequency, and a protective relay
WO2000069042A1 (en) * 1999-05-05 2000-11-16 General Electric Company Adaptive sampling rate based on power system frequency
US6366864B1 (en) 1999-05-05 2002-04-02 General Electric Company Adaptive sampling rate based on power system frequency

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