Electric power system protection and control system

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.

1. An electric power system protection and control system, comprising:
 a plurality of protection controllers  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 controllers  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 terminals;  
 each of said protection controllers  and control terminals comprising: 
 a correlation processing unit 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 accurate time-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  correlation processing unit to said protection and control terminals  power system monitoring and control host via said communication network, respectively; and  
 said power system monitoring and control host comprising: 
 receiving/displaying means for receiving said result of said comparing means  correlation processing unit via said communication network and displaying said result of said comparing means  correlation processing unit.  
 
 
 
     
     
       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  correlation processing unit 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 relay is 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  correlation processing unit 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 said two-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  correlation processing unit is provided 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 a correlation 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 by said 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  correlation processing unit 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 as correlation 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  correlation processing unit is provided with,  
 sixth judging means for judging whether said re-closing means is executed;  
 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 which said 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  correlation processing unit is provided with,  
 eighth judging means for judging whether said two-way switch is re-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, when said 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  correlation processing unit 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  correlation processing unit 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 means for 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  correlation processing unit 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 of protection 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 a communication 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 terminals operation 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 result of 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 or closed 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 judging means 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 said second 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 by said 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 system monitoring 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 terminals comprising: 
 each of said protection controllers  and control terminals comprising: 
 a correlation processing unit having a CPU and a memory unit, which are connected within the protection controller, the correlation processing unit correlating 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  
 a correlation result transmission circuit to send a result of said correlation circuit  processing unit to said protection and control terminals  power system monitoring and control host via said communication network, 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 correlation received 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 said correlation circuit  processing unit 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 second judging 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 transmission circuit 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-way switch 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 CPU comprising: 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 a correlation 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 said manual 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 correlation 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 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 circuit is 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 which said 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 is re-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 said re-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-way switch 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 data based 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 receive said 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.