JPS645322A - Sampling synchronizing system for looped digital protection relay - Google Patents

Sampling synchronizing system for looped digital protection relay

Info

Publication number
JPS645322A
JPS645322A JP62159016A JP15901687A JPS645322A JP S645322 A JPS645322 A JP S645322A JP 62159016 A JP62159016 A JP 62159016A JP 15901687 A JP15901687 A JP 15901687A JP S645322 A JPS645322 A JP S645322A
Authority
JP
Japan
Prior art keywords
sampling signal
time
order
sampling
devices
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
JP62159016A
Other languages
Japanese (ja)
Inventor
Toshiyuki Okitsu
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.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing Co 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 Meidensha Corp, Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Corp
Priority to JP62159016A priority Critical patent/JPS645322A/en
Publication of JPS645322A publication Critical patent/JPS645322A/en
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE:To improve fault judging accuracy, by calculating propagation delay time of sampling signal between respective devices and outputting a sampling signal at a time where the propagation delay time is considered, thereby obtaining sampling data at same time in respective devices. CONSTITUTION:A central relay device 1 for producing a reference sampling signal and a plurality of terminals 8 for collecting signals are coupled in loop through cables 9, 10 so as to transmit a sampling signal to lower-order devices sequentially from upper-order devices. Synchronous arithmetic circuits 4 are provided to respective devices 1, 8. A transmitting/receiving section for returning the sampling signal to the upper-device and a timer section are provided in the synchronous arithmetic circuit 4 in order to measure a time TX to be elapsed until a signal transmitted to a lower device is returned. Then (TP - TX/2) is calculated for a time interval TP between transmission and reception of sampling signal, and upon elapse of the calculated time, sampling signal is transmitted again to the lower-order device.
JP62159016A 1987-06-26 1987-06-26 Sampling synchronizing system for looped digital protection relay Pending JPS645322A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62159016A JPS645322A (en) 1987-06-26 1987-06-26 Sampling synchronizing system for looped digital protection relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62159016A JPS645322A (en) 1987-06-26 1987-06-26 Sampling synchronizing system for looped digital protection relay

Publications (1)

Publication Number Publication Date
JPS645322A true JPS645322A (en) 1989-01-10

Family

ID=15684407

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62159016A Pending JPS645322A (en) 1987-06-26 1987-06-26 Sampling synchronizing system for looped digital protection relay

Country Status (1)

Country Link
JP (1) JPS645322A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0727756A1 (en) 1995-02-20 1996-08-21 Wacom Co., Ltd. Pressure sensitive arrangement and stylus pen
EP0747852A2 (en) 1995-06-06 1996-12-11 Wacom Co., Ltd. Pointing unit and stylus pen
WO2011096011A1 (en) * 2010-02-03 2011-08-11 株式会社 日立製作所 Digital protection control system and digital protection control apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0727756A1 (en) 1995-02-20 1996-08-21 Wacom Co., Ltd. Pressure sensitive arrangement and stylus pen
US5565632A (en) * 1995-02-20 1996-10-15 Wacom Co., Ltd. Pressure sensitive stylus pen
EP0747852A2 (en) 1995-06-06 1996-12-11 Wacom Co., Ltd. Pointing unit and stylus pen
WO2011096011A1 (en) * 2010-02-03 2011-08-11 株式会社 日立製作所 Digital protection control system and digital protection control apparatus
US9118173B2 (en) 2010-02-03 2015-08-25 Hitachi, Ltd. Digital Protection control system and digital protection control apparatus

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