Substation system

• US 7,043,381 B2
• Filed: 06/24/2004
• Issued: 05/09/2006
• Est. Priority Date: 01/29/2002
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Aihara, Takashi, Wakida, Takayuki, Miyazawa, Shigeru, Matsuyama, Yoshimune
• Primary Examiner(s): Hoff, Marc S.
• Assistant Examiner(s): Desta, Elias
• Application Number:
  US10/874,253
• Publication Number:
  US 20040236526A1
• Time in Patent Office: 684 Days
• Field of Search: 702/57, 702/62, 702/188, 702/189, 700/292, 700/295, 340/870.02, 361/64
• US Class Current: 702/62
• CPC Class Codes: H02J 13/00001 characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/16 Electric power substations
• CPC Class Codes: Y04S 10/40 Display of information, e.g. of data or controls

Abstract

A network which simplifies structure, realizes autonomous automation, digitalizes data, and effectively uses data is disclosed. A measuring card for measuring voltage and current according to values detected by the state detector that detects voltage and current of the system. A protection card performs a protective arithmetical operation according to values detected by the state detector and outputting a protection command to a controller. A control card performs a protective arithmetical operation according to values detected by the state detector and outputting a control command to a controller are integrated within an on-site cubicle. The protection card, measuring card, and control card are connected to the substation monitoring and controlling device via a serial bus which is shared by those cards, and data is sent and received between those cards and the monitoring and controlling device via the serial bus.

Claims

1. A substation system comprising:

a protection state detector for detecting a state of monitored objects connected to a power system and for protecting the state of said monitored objects;

a monitor state detector for detecting the state of said monitored objects connected to said power system and for monitoring the state of said monitored objects;

a controller for controlling controlled objects connected to said power system according to control information;

a monitor-information creating device for exchanging information with said monitor state detector using digital signals as media and also creating information about the state of said monitored objects;

a control-information creating device for creating control information for controlling said controller, converting the created control information along with received control information into digital signals and transmitting the signals to said controller; and

said monitor-information creating device and said control-information creating device connected to a monitoring and controlling device for collecting information about the state of said monitored objects and outputting control information for controlling said controlled objects via a signal transmission path shared by those devices, and exchange information with said monitoring and controlling device using digital signals as media;

wherein said monitor-information creating device is connected to said protection state detector and said controller via a protection signal transmission path; and

said control-information creating device is connected to said monitor state detector via a monitor signal transmission path.

2. A substation system according to claim 1, wherein said monitor-information creating device and said control-information creating device are integrated within a cubicle and installed near said monitored and controlled objects.

3. A substation system according to claim 1, wherein said state detector converts the state of said monitored objects into electric signals, converts the electric signals into digital signals, and outputs the signals;

and said controller converts received digital signals into electric signals and outputs the signals to said controller.

4. A substation system according to claim 1, wherein optical communication is used as a communication medium for said digital signals.

5. A substation system according to claim 1, wherein said signal transmission path transmits information in accordance with an international standard protocol.