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Control Computers

Electric-power-system-protection-and-control-system

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Electric power system protection and control system

Details

Inventors: Hasegawa, Osamu; Sirota, Yosihiro; Kaino, Yasuo;
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Lieu; Julie
Assistant Examiner:
Attorney, Agent or Firm: Foley & Lardner

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.

DETAILED DESCRIPTION It is an object of the present invention to provide a system which performs correlation processing of CB operation state change and relay operation state change easily and rapidly without employing a CB relay correlation database.
In order to solve the problem mentioned above, the inventors of the present invention noted that, as the transmission system between the protection and control terminals and power system monitoring and control host in the power system monitoring and control system, a communication network such as an LAN or WAN whereby mutual communication of larger volumes and higher rates of data can be achieved than with the conventional TC devices or CDT devices could be applied, and that, if such a communication network were employed, special restrictions would be unnecessary even if a large amount of data is sent from the protection and control terminals to the power system monitoring and control host.
Specifically, the inventors of the present application aimed at solving the problem described above by constructing the power system monitoring control system using such an LAN or WAN or the like communication network as the transmission system and by devising means for performing the correlation processing of the CB operation state change and the relay operation state change at the protection and control terminal side.
Specifically, with a power system protection and control system according to a first embodiment of the invention comprising at least one protection and control terminal that performs protection and control of the power system by operating a two-way switch in response to a state variable input from the power system; An electric power system protection and control system comprises 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 the protection and control terminals via a communication network, for monitoring and controlling an operation of the power system based on information sent from the protection and control terminals

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