Smart disconnect switch interbase

• US 7,130,722 B2
• Filed: 02/22/2005
• Issued: 10/31/2006
• Est. Priority Date: 02/22/2005
• Status: Active Grant

• Current Assignee: Aclara Technologies LLC (Hubbell, Inc.)
• Original Assignee: Distribution Control Systems Inc (Hubbell, Inc.)
• Inventors: Soni, Devendra K.
• Primary Examiner(s): Picard, Leo
• Assistant Examiner(s): Rapp, Chad
• Application Number:
  US11/063,200
• Publication Number:
  US 20060190140A1
• Time in Patent Office: 616 Days
• Field of Search: 700/286, 700/291, 700/292, 700/295, 700/297, 700/298
• US Class Current: 700/286
• CPC Class Codes: H02J 13/00006 characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
• CPC Class Codes: H02J 2310/60 Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
• CPC Class Codes: H02J 2310/64 The condition being economic, e.g. tariff based load management
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y02B 90/20 Smart grids as enabling technology in buildings sector smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 40/12 characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
• CPC Class Codes: Y04S 50/10 Energy trading, including energy flowing from end-user application to grid

Abstract

Apparatus (10) for controlling supply of electricity through an electrical distribution network to a customer. An electrical meter (12) is plugged into an electrical socket (14) at a customer'"'"'s premises. Electricity flows from a power line through the socket into the premises, the amount of electricity used being measured by the meter. The apparatus is interposed between the meter and the socket and includes a switch (18) to interrupt flow of electricity into the premises. The switch is controlled by the utility, preferably through programming of the apparatus or through a TWACS® communication system. This enables the utility to selectively control supply of electricity to the premises apart from the flow of electricity to any other premises connected to the same power line (L).

Claims

1. Apparatus for controlling supply of electricity through an electrical distribution network to a customer comprising:

an electrical socket at a customer'"'"'s premises through which electricity flows from a power line into the premises;

an electrical meter plugged into the socket and through which the electricity passes as it flows into the premises for the meter to measure the amount of electricity usage at the premises;

switch means interposed between the meter and the socket and operable to interrupt flow of electricity into the premises, the switch means being controlled by an utility whereby the utility can selectively control supply of electricity to the premises apart from the flow of electricity to any other premises connected to the same power line; and

,

processor means controlling the switch means to selectively control supply of electricity to the premises apart from the flow of electricity to any other premises connected to the same power line, the processor means being responsive to current usage at the premises to provide over-current tripping of the switch means to interrupt power input to the premises if the current exceeds a predetermined current value for a particular set of operating conditions at the premises and the duration of the over-current conditions extends beyond a predetermined time interval, which interval is a function of the amount by which the over-current exceeds the predetermined current value whereby the interval is shorter the more the over-current exceeds the value.

2. The apparatus of claim 1 in which the switch means is operable to interrupt and restore the flow of electricity into the premises under control of the processor means.

3. The apparatus of claim 2 in which the processor means is programmable to operate the switch means to interrupt or restore the flow of electricity based upon predetermined criteria for interrupting or restoring power to the customer.

4. The apparatus of claim 3 further including a two-way communications system in which communications are sent back and forth between the utility and the electrical meter over the utility'"'"'s power lines to control operation of the switch means, and the switch means is responsive to commands transmitted by the utility to the apparatus to operate the switch means to interrupt and restore the flow of electricity, or to modify the predetermined criteria upon which the switch means is operated to interrupt or restore the flow.

5. The apparatus of claim 4 in which the two-way communications system is an automated communications system.

6. The apparatus of claim 1 further including means determining the status of the switch means by detecting power input to the premises, whereby if power is available at the utility and premises, the switch means is closed, but if power is available at the utility but not at the premises, the switch means is open.

7. The apparatus of claim 1 further including manually operable means for closing the switch means to restore power to the premises, the apparatus first having to place the switch means in an arm-to-reset status before the switch means can be closed.

8. In an electrical meter through which electricity passes as it flows from a utility into a premises, the meter measuring the amount of electricity usage at the premises, a disconnect switch interbase (DSI) comprising:

switch means operable to interrupt or restore flow of electricity into the premises; and

,

processor means controlling the switch means to selectively control supply of electricity to the premises apart from the flow of electricity to any other premises connected to the same power line, the DSI measuring current usage at the premises and providing over-current tripping of the switch means to interrupt power input to the premises if the measured current exceeds a predetermined current value for a particular set of operating conditions at the premises and the duration of the over-current conditions extends beyond a predetermined time interval, which interval is a function of the amount by which the over-current exceeds the predetermined current value whereby the interval is shorter the more the over-current exceeds the value.

9. The DSI of claim 8 in which the processor means is programmed to operate the switch means to interrupt or restore the flow of electricity based upon predetermined criteria established by the utility for interrupting or restoring power to a customer.

10. The DSI of claim 9 which is responsive to commands transmitted by the utility to operate the switch means to interrupt or restore the flow of electricity, or to modify the predetermined criteria upon which the switch means is operated to interrupt or restore the flow.

11. The DSI of claim 10 in which the status of the switch means is determined by detecting a power input to the premises;

whereby, if power is available at the utility and the premises, the switch means is closed, but if power is available at the utility but not at the premises, the switch means is open.

12. The DSI of claim 8 for substantially instantaneously tripping the switch means to interrupt power input to the premises if the measured current exceeds the predetermined current value for a particular set of operating conditions at the premises.

13. The DSI of claim 8 for measuring current usage of the premises and providing over-current tripping of the switch means to interrupt power input to the premises as a function of the power usage at the premises and the time of day thereby to couple power usage at the premises to variations in demand for electricity at different times during the day.

14. The DSI of claim 8 for resetting the switch means, so electricity is restored to the premises, only after a predetermined time delay.

15. The DSI of claim 14 for arming the switch means to be reset after the predetermined time delay, and means by which a customer resets the switch means after it is armed.

16. The DSI of claim 15 for arming the switch means to be reset after the predetermined time delay, but not allowing the switch to be reset during peak periods of energy demand on the utility.

17. The DSI of claim 15 in which the customer is prevented from resetting the switch means after it is armed, until the customer has first contacted the utility.

18. The DSI of claim 8 which is responsive to a command from the utility to separately configure each premises at which a DSI is installed to set a current trip point for each premises which may vary from that of other premises thereby to limit demand on the utility by each premises as a function of an energy usage demand of each customer.

19. The DSI of claim 18 by which separately limiting the demand placed on the utility by each customer avoids loss of service from the utility during peak energy demand periods.

20. The DSI of claim 8 for establishing a current limit for the premises of a non-paying customer to prevent the customer from using appliances other than those which the utility is required to allow the customer to use, and to interrupt power to the customer is the current limit is exceeded.

21. The DSI of claim 20 further including arming the switch means to be reset after power to the premises is interrupted, and means by which a customer resets the switch means after it is armed, the customer being prevented from reselling the switch means after it is armed, until the utility is first contacted and the customer is apprised of his use of appliances in addition to those which the utility is required to allow him to use.

22. The DSI of claim 8 used in conjunction with a current protection means installed at the premises to interrupt power in event of an overload, the DSI measuring current usage of the premises and providing over-current tripping of the switch means to interrupt power input to the premises if the current protection means fails when an overload occurs.

23. The DSI of claim 8 used in conjunction with an arc current fault interrupter means installed at the premises to interrupt power in event of an unintentional, low current level electrical discharge, the DSI monitoring current usage of the premises and providing over-current tripping of the switch means to interrupt power input to the premises if the interrupter means fails when an electrical discharge occurs.

24. The DSI of claim 8 further including an activity log for recording information related to the tripping, resetting, and arming of the switch means.