Electrical load management system

• US 4,190,800 A
• Filed: 12/12/1978
• Issued: 02/26/1980
• Est. Priority Date: 11/22/1976
• Status: Expired due to Term

• Current Assignee: Scientific-Atlanta Incorporated (Cisco Systems, Inc.)
• Original Assignee: Scientific-Atlanta Incorporated (Cisco Systems, Inc.)
• Inventors: Robinson, Glen P. Jr., Kelly, Jack R. Jr.
• Primary Examiner(s): Martin, John C.
• Application Number:
  US05/968,811
• Time in Patent Office: 441 Days
• Field of Search: 340/310 A, 340/163, 325/308, 325/309, 325/37, 325/53, 325/54, 325/64, 364/492, 307/38, 307/40
• US Class Current: 340/12.33
• 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 13/00004 characterised by the power network being locally controlled
• CPC Class Codes: H02J 13/00022 using wireless data transmission
• CPC Class Codes: H04Q 9/14 Calling by using pulses
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/40 Display of information, e.g. of data or controls
• CPC Class Codes: Y04S 40/126 using wireless data transmission

Abstract

A central station monitors the use of electrical power and when peak demand periods occur, coded information is transmitted by radio from the central station to remote receivers mouned on poles proximate power distribution transformers serving the customers. The transmitted signal includes both address and command information which are decoded at the receivers. Those receivers which have been addressed pass the command information as carrier signals over the distribution lines from the secondaries of the respective distribution transformers to the customers. This address information informs the customers of the existence of the peak load conditions and/or controls the operation of the customers'"'"' power consuming devices and electric meter.

Claims

1. An improved electrical load management system comprising:

a plurality of distribution transformers each having primary and secondary windings, each of said transformers coupling an electrical power line joined to its primary winding to distribution lines connected to its secondary winding and stepping down the voltage level of the power carried by the associated power line to a level to be supplied via the distribution lines to a group of electricity users, each distribution line servicing at least one of said users;

means for transmitting by radio from a central location a coded signal having address and command information;

a receiver located proximate each of said distribution transformers for receiving said signal independently of said power lines and the transformers;

means associated with said receivers for decoding said signal;

means responsive to said decoded signal for generating a modulated carrier signal; and

means for coupling said carrier signal via the distribution lines to at least one group of users determined by the decoding of said address information.

2. An improved electrical load management system as set forth in claim 1, wherein said receivers are mounted on utility poles.

3. An improved electrical load management system as set forth in claim 1, wherein said decoding means is responsive to the address information for controlling said carrier signal generating means.

4. An improved electrical load management system as set forth in claim 1, wherein said command information is representative of electrical load demand.

5. An improved electrical load management system as set forth in claim 4, further comprising:

means at the users'"'"' locations responsive to said carrier signal for displaying the status of said electrical load demand.

6. An improved electrical load management system as set forth in claim 4, further comprising:

means at the users'"'"' locations responsive to said carrier signal for controlling electrical meters.

7. An improved electrical load management system as set forth in claim 4, further comprising:

means at the users'"'"' locations responsive to said carrier signal for controlling operation of power consuming units.