JPS5475051A - Phase comparison relay - Google Patents
Phase comparison relayInfo
- Publication number
- JPS5475051A JPS5475051A JP14291077A JP14291077A JPS5475051A JP S5475051 A JPS5475051 A JP S5475051A JP 14291077 A JP14291077 A JP 14291077A JP 14291077 A JP14291077 A JP 14291077A JP S5475051 A JPS5475051 A JP S5475051A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- phase
- current
- signal
- delay
- 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 make a decision capable as an internal fault when caused a phase above an expected value, by means of transceiving a phase comparison signal so that a phase of current at both ends of the protected section may be in the same phase at the time of current conduction.
CONSTITUTION: At a side of end A and B, a current, flowing in a transmission line 10, is taken out by a current transformer 11A, 11B, being fed to a square wave conversion circuit 12A, 12B having a level settling function. And an output of the above is given to an on-delay timer circuit 12A-a, 12B-a. A signal from the above circuit is transmitted to a remote end receiver 14B, 14A through a transmitter 13A, 13B. And an intra-end square wave signal, outputted from 12A-a, 12B-a, is processed a compensation of transmission delay in a delay compensation circuit 15A, 15B, being transmitted to a NAND circuit 18A, 18B together with the received signal, with an output of the before said compared with a transmission signal of the intra-end in an AND circuit 19A, 19B. The above described AND circuits 20A, 20B will be a different AND circuit, when a difference is produced between the current phase in those above, each of the outputs will be fed to a time setting circuit 22A, 22B through an OR circuit 21A, 21B. For a measured value exceeding the expected value, a decision is made as an internal fault.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14291077A JPS5475051A (en) | 1977-11-29 | 1977-11-29 | Phase comparison relay |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14291077A JPS5475051A (en) | 1977-11-29 | 1977-11-29 | Phase comparison relay |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5475051A true JPS5475051A (en) | 1979-06-15 |
Family
ID=15326449
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14291077A Pending JPS5475051A (en) | 1977-11-29 | 1977-11-29 | Phase comparison relay |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5475051A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04271224A (en) * | 1991-02-25 | 1992-09-28 | Hitachi Ltd | Digital current differential relay |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS511023A (en) * | 1974-06-12 | 1976-01-07 | Wisconsin Alumni Res Found | |
JPS51130849A (en) * | 1975-05-08 | 1976-11-13 | Mitsubishi Electric Corp | Carrier protective relay |
-
1977
- 1977-11-29 JP JP14291077A patent/JPS5475051A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS511023A (en) * | 1974-06-12 | 1976-01-07 | Wisconsin Alumni Res Found | |
JPS51130849A (en) * | 1975-05-08 | 1976-11-13 | Mitsubishi Electric Corp | Carrier protective relay |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04271224A (en) * | 1991-02-25 | 1992-09-28 | Hitachi Ltd | Digital current differential relay |
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