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Electric power system protection and control system
RE40037 Electric power system protection and control system
Patent Drawings:Drawing: RE40037-10    Drawing: RE40037-11    Drawing: RE40037-12    Drawing: RE40037-13    Drawing: RE40037-14    Drawing: RE40037-15    Drawing: RE40037-16    Drawing: RE40037-17    Drawing: RE40037-18    Drawing: RE40037-3    
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(16 images)

Inventor: Hasegawa, et al.
Date Issued: January 29, 2008
Application: 10/322,588
Filed: December 19, 2002
Inventors: Hasegawa; Osamu (Tokyo, JP)
Shirota; Yoshihiro (Tokyo, JP)
Kaino; Yasuo (Tokyo, JP)
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Lieu; Julie Bichngoc
Assistant Examiner:
Attorney Or Agent: Foley & Lardner LLP
U.S. Class: 340/635; 340/286.01; 340/286.02
Field Of Search: 340/635; 340/286.01; 340/286.02; 705/FOR103
International Class: G08B 21/00; H02H 3/00; H02H 7/26
U.S Patent Documents:
Foreign Patent Documents: 0 853 368; 0 940 901; 10-222785; 10-257661
Other References: Toshiba Fuchu Works, Project I, pp. 2-35, 1991. cited by other.
Toshiba Protective Relays, Toshiba Corporation, pp. 1-13. cited by other.
Bolam et al., "Experience in the Application of Substation Co-Ordinated Control and Protection with Development Trends In the Standard Control System Open Architecture," Fourth International Conference on Power System Control and Management, pp.92-97, London, UK, Apr. 16-18, 1996. cited by other.
Lu Wenzhe et al., "A Simple Data Communication Scheme of a Modular Comprehensive Automation System for Substations," Proceedings on the 4.sup.th International Conference on Advances in Power System Control, Operation and Management, pp. 317-320,Hong Kong, Nov. 11-14, 1997. cited by other.
Ungrad et al., "The Role of SMS (Substation Monitoring Systems) in Enhancing Protection and Control Functions," 12.sup.th International Conference on Electricity Distribution, pp. 4.10.1-4.10.5, London, UK, May 17-21, 1993. cited by other.









Abstract: A Power system protection and control system has protection and control terminals that perform protection and control of a power system by operation of a plurality of CBs in response to state variables input from power system; and a power system monitoring and control host mutually connected in a fashion to permit data exchange through a transmission system (communication network) with protection and control terminals and that performs monitoring and control of power system in accordance with data transmitted from protection and control terminals. Protection and control terminals each has a correlation circuit that performs correlation of an operated CB and the cause of its operation, using information sent from protective relay circuit, CB control circuit, re-closure circuit and CB state receiving circuit when at least one of a plurality of CBs is operated, and a correlation result transmission circuit that transmits the result obtained by the correlation processing of this correlation circuit to power system monitoring and control host through transmission system. The power system monitoring and control host includes a correlation result transmission unit that receives and displays the correlation result transmitted through transmission system from correlation result transmission circuit, associated message file storage unit and CB operation display unit.
Claim: What is claimed is:

1. An electric power system protection and control system, comprising: a plurality of protection .[.controllers.]. .Iadd.and control terminals.Iaddend., each for executingprotection and control of an electric power system by inputting a status quantity; and a power system monitoring and control host connected to each of said protection .[.controllers.]. .Iadd.and control terminals .Iaddend.via a communication network,for monitoring and controlling an operation of said power system based on information sent from said protection and control terminals; each of said protection .[.controllers.]. .Iadd.and control terminals .Iaddend.comprising: a correlation processingunit having a CPU and a memory unit, which are connected within the protection and controller, the correlation processing unit correlating the operation state changes of two-way switch operations and protective relay operations, facilitating accuratetime-point stamping of state change data and eliminating any order switching between relay and CB operation state changes; and sending means for sending result of said .[.correlating means.]. .Iadd.correlation processing unit .Iaddend.to said.[.protection and control terminals.]. .Iadd.power system monitoring and control host .Iaddend.via said communication network, respectively; and said power system monitoring and control host comprising: receiving/displaying means for receiving saidresult of said .[.comparing means.]. .Iadd.correlation processing unit .Iaddend.via said communication network and displaying said result of said .[.comparing means.]. .Iadd.correlation processing unit.Iaddend..

2. The electric power system protection and control system according to claim 1, further comprising: relay means for tripping said two-way switch in accordance with said status quantity of said power system, wherein said .[.correlating means.]. .Iadd.correlation processing unit .Iaddend.is provided with, first judging means for judging whether said two-way switch is opened or closed in accordance with said operation state of said two-way switch; second judging means for judging whether a relayis operated in association with said two-way switch is opened when said first judging means judges said two-way switch is opened; first forming means for forming data as said result of said .[.correlating means.]. .Iadd.correlation processing unit.Iaddend.based on both data of said relay and said two-way switch after said second judging means; and second forming means for forming data as a correlation result, which said two-way switch is opened by a manual operation, when no operation in saidtwo-way switch is judged by said second judging means.

3. The electric power system protection and control system according to claim 2, further comprising: re-closing means for re-closing said two-way switch; wherein said .[.correlating means.]. .Iadd.correlation processing unit .Iaddend.isprovided with, third judging means for judging whether said re-closing means is operated in accordance with said two-way switch when said two-way switch is judged by said first judging means as not being closed; third forming means for forming data as acorrelation result, in which said two-way switch is operated, when said two-way switch is judged by said third judging means as being closed; and fourth forming means for forming data as a correlation result, in which said two-way switch is re-closed bysaid manual operation, when said third judging means judge that said two-way switch is closed, but said re-closing means is not executed.

4. The electric power system protection and control system according to claim 2, wherein said .[.correlating means.]. .Iadd.correlation processing unit .Iaddend.is provided with, fourth judging means for judging whether said relay is operated; fifth judging means for judging whether said two-way switch is re-closed within a fixed time corresponding to said relay being operated when said relay is judged as operated by said fourth judging means; and fifth forming means for forming data ascorrelation result, in which said two-way switch is failed to trip, when said two-way switch is judged as not re-closed within the fixed time by said fifth judging means.

5. The electric power system protection and control system according to claim 3, wherein said .[.correlating means.]. .Iadd.correlation processing unit .Iaddend.is provided with, sixth judging means for judging whether said re-closing means isexecuted; seventh judging means for judging whether said two-way switch is re-closed within a fixed time when said sixth judging means judge said re-closing means is executed; and sixth forming means for forming data as a correlation result, in whichsaid two-way switch is failed to be re-closed, when said seventh judging means judge that said re-closing means is executed within a fixed time, but said two-switch is not closed.

6. The electric power system protection and control system according to claim 3, wherein said .[.correlating means.]. .Iadd.correlation processing unit .Iaddend.is provided with, eighth judging means for judging whether said two-way switch isre-tripped when said third judging means judge that said two-way switch is closed and said re-closing means is executed; and seventh forming means for forming data as a correlation result, in which said two-way switch is failed to be re-closed, whensaid re-closing means if re-tripped within fixed time as judged by said eighth judging means.

7. The electric power system protection and control system according to claim 6, wherein said .[.correlating means.]. .Iadd.correlation processing unit .Iaddend.is provided with, eighth forming means for forming data as a correlation result,in which means said two-way switch is re-closed, when said two-way switch is not re-tripped within the fixed time as judged by said eighth judging means.

8. The electric power system protection and control system according to claim 1, wherein said sending means is provided with, converting means for converting data sent by said .[.correlating means.]. .Iadd.correlation processing unit.Iaddend.into converted data based on a predetermined format; sending means for sending said converted data to said receiving/displaying means via a communication network, wherein said receiving/displaying means is provided with, first receiving meansfor receiving said converted data from sending means; and displaying means for displaying said correlation result based on said converted data.

9. The electric power system protection and control system according to claim 1, wherein said .[.correlating means.]. .Iadd.correlation processing unit .Iaddend.makes at least one of operation time, two-way switch name, direction of operation,and operational area, related to said two-way switch name, as the correlation result.

.[.10. A program storing medium readable by a computer, the medium storing a program of instructions executable by said computer to perform method steps for an electric power system protection and control system, comprising: a plurality ofprotection and control terminals, each for executing protection and control of an electric power system by inputting a status quantity; and a power system monitoring and control host connected to each of said protection and control terminals via acommunication network, for monitoring and controlling an operation of said power system based on information sent from said protection and control terminals; said method comprising the steps of: correlating in the protection and control terminalsoperation state changes of two-way switch operations and protective relay operations, facilitating accurate time-point stamping of state chance data and eliminating any order switching between relay and CB operation state changes; and sending a resultof said correlating steps to said power system monitoring and control host via said communication network, respectively..].

.[.11. The program storing medium according to claim 10, wherein: executing correlating means steps comprising: executing first judging means step for executing said first judging means for judging whether said two-way switch is opened orclosed in accordance with a operation of said two-way switch; executing second judging means step for executing said second judging means for judging whether relay is operated in association with said two-way switch is opened when said first judgingmeans judge that said two-way switch is opened; executing first forming means step for executing said first forming means for forming data as said result of said correlating means based on both data of said relay and said two-way switch after saidsecond judging means; and executing second forming means step for executing said second forming means forming data as a correlation result, which said two-way switch is opened by manual operation, when no operation in said two-way switch is judged bysaid second judging means..].

12. An electric power system protection and control system, comprising: a plurality of protection and control terminals, each for executing protection and control of an electric power system by inputting a status quantity; a power systemmonitoring and control host connected to each of said protection and control terminals via a communication network, for monitoring and controlling an operation of said power system based on information sent from said protection and control terminalscomprising: each of said protection .[.controllers.]. .Iadd.and control terminals .Iaddend.comprising: a correlation processing unit having a CPU and a memory unit, which are connected within the protection controller, the correlation processing unitcorrelating the operation state changes of two-way switch operations and protective relay operations, facilitating accurate time-point stamping of state change data and eliminating any order switching between relay and CB operation state changes; and acorrelation result transmission circuit to send a result of said correlation .[.circuit.]. .Iadd.processing unit .Iaddend.to said .[.protection and control terminals.]. .Iadd.power system monitoring and control host .Iaddend.via said communicationnetwork, respectively; said power system monitoring and control host comprising: correlation result reception unit to receive said result of said correlation processing unit; and a CB operation display unit to display said result of said correlationreceived by said correlation result reception unit.

13. The electric power system protection and control system according to claim 12, further comprising: a protective relay circuit to trip said two-way switch in accordance with said status quantity of said power system; wherein saidcorrelation .[.circuit.]. .Iadd.processing unit .Iaddend.is provided with a CPU, said CPU comprising: a first judging unit judge whether said two-way switch is opened or closed in accordance with said operation state of said two-way switch; a secondjudging unit to judge whether a relay is operated in association with said two-way switch is opened when said first unit judges said two-way switch is opened; a first forming unit to form data as said result of said correlation result transmissioncircuit based on both data of said relay and said two-way switch after said second judging unit; and a second forming unit to form data as a correlation result, which said two-way switch is opened by a manual operation, when no operation in said two-wayswitch is judged by said second judging unit.

14. The electric power system protection and control system according to claim 13, further comprising: a re-closure circuit to re-close said two-way switch, wherein said correlation result transmission circuit is provided with a CPU, said CPUcomprising: a third judging unit to judge whether said re-closure circuit is operated in accordance with said two-way switch when said two-way switch is judged by said first judging unit as not being closed; a third forming unit to form data as acorrelation result, in which said two-way switch is operated, when said two-way switch is judged by said third judging unit as being closed; and a fourth forming unit to form data as a correlation result in which said two-way switch is re-closed by saidmanual operation, when said third judging unit judge that said two-way switch is closed, but said re-closure circuit is not executed.

15. The electric power system protection and control system according to claim 13, wherein said correlation result transmission circuit is provided with a CPU, said CPU comprising: a fourth judging unit to judge whether said relay is operated; a fifth judging unit to judge whether said two-way switch is re-closed within a fixed time corresponding to said relay being operated when said relay is judged as operated by said fourth judging unit; and a fifth forming unit to form data as correlationresult, in which said two-way switch is failed to trip, when said two-way switch is judged as not re-closed within the fixed time by said fifth judging unit.

16. The electric power system protection and control system according to claim 14, wherein said correlation result transmission circuit is provided with a CPU, said CPU comprising: a sixth judging unit to judge whether said re-closure circuitis executed; a seventh judging unit to judge whether said two-way switch is re-closed within a fixed time when said sixth judging unit judge said re-closure circuit is executed; and a sixth forming unit to form data as a correlation result, in whichsaid two-way switch is failed to be re-closed, when said seventh judging unit judge that said re-closure circuit is executed within a fixed time, but said two-switch is not closed.

17. The electric power system protection and control system according to claim 14, wherein said correlation result transmission circuit is provided with a CPU, said CPU comprising: a eighth judging unit to judge whether said two-way switch isre-tripped when said third judging unit judge that said two-way switch is closed and said re-closure circuit is executed; and a seventh forming unit to form data as a correlation result, in which said two-way switch is failed to be re-closed, when saidre-closure circuit is re-tripped within fixed time as judged by said eighth judging unit.

18. The electric power system protection and control system according to claim 17, wherein said correlation result transmission circuit is provided with, a eighth forming unit to form data as a correlation result, in which means said two-wayswitch is re-closed, when said two-way switch is not re-tripped within the fixed time as judged by said eighth judging unit.

19. The electric power system protection and control system according to claim 12, wherein said correlation result transmission circuit is provided with, a converting unit to convert data sent by said correlation circuit into converted databased on a predetermined format; and a sending unit to send said converted data to said correlation result reception unit via a communication network, wherein said correlation result reception unit is provided with, a first receiving unit to receivesaid converted data from sending unit; and a displaying unit to display said correlation result based on said converted data.

20. The electric power system protection and control system according to claim 12, wherein said correlation result transmission circuit makes at least one of operation time, two-way switch name, direction of operation, and operational area,related to said two-way switch name, as the correlation result.
Description:
 
 
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