JPS645322A - Sampling synchronizing system for looped digital protection relay - Google Patents
Sampling synchronizing system for looped digital protection relayInfo
- 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
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.
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)
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 |
-
1987
- 1987-06-26 JP JP62159016A patent/JPS645322A/en active Pending
Cited By (5)
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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