SIMPLIFIED ENERGY METER CONFIGURATION

• US 20120310557A1
• Filed: 05/08/2012
• Published: 12/06/2012
• Est. Priority Date: 06/03/2011
• Status: Active Grant

• Current Assignee: Veris Industries LLC (Schneider Electric SE)
• Original Assignee: Veris Industries LLC (Schneider Electric SE)
• Inventors: Bowman, Marc, Parker, Aaron
• Granted Patent: US 9,250,308 B2
• Time in Patent Office: Days
• US Class Current: 702/61
• CPC Class Codes: G01R 21/133 by using digital technique
• CPC Class Codes: G01R 35/04 of instruments for measuring time integral of power or current

Abstract

A power and energy meter self configures the pulse weight and pulse duration for pulse communication.

Claims

1. A method of configuring a power meter, said method comprising the steps of:

(a) comparing a maximum power measurable by said power meter to a pulse output power comprising a pulse having an initial pulse weight and an initial pulse duration; and

(b) changing at least one of said pulse weight and said pulse duration until said pulse output power is at least equal to said maximum power measurable by said power meter.

2. The method of configuring a power meter of claim 1 wherein said maximum power measurable by said power meter comprises a product of a maximum primary current measurable by a current transducer of said power meter and a voltage of a circuit to be monitored by said power meter.

3. The method of configuring a power meter of claim 1 wherein said initial pulse weight is a maximum pulse weight of a plurality of potential pulse weights transmissible by said power meter.

4. The method of configuring a power meter of claim 1 wherein said initial pulse duration is a minimum pulse duration of a plurality of durations of a pulse transmissible by said power meter.

5. The method of configuring a power meter of claim 1 wherein said initial pulse weight is one of a plurality of user selectable potential pulse weights for a pulse transmissible by said power meter.

6. A method of configuring a power meter, said method comprising the steps of:

(a) calculating a maximum theoretical power measurable by said power meter;

(b) calculating a pulse output power for said power meter, said pulse output power comprising a communication pulse having a minimum pulse weight of a plurality of potential pulse weights of pulses transmissible by said power meter and a maximum pulse duration of a plurality of potential durations of pulses transmissible said power meter;

(c) if said pulse output power is not at least equal to said maximum theoretical power, calculating said pulse output power for a next shorter duration of said plurality of potential durations of pulses transmissible by said power meter;

(d) if said pulse output power is not at least equal to said maximum theoretical power when calculated with a minimum pulse duration of said plurality of potential pulse durations, calculating said pulse output power for a next greater pulse weight of said plurality of potential pulse weights and said maximum pulse duration;

(e) repeating steps (c) and (d) until said pulse output power is at least equal to said maximum theoretical power; and

(f) configuring said power meter to transmit a pulse having a least pulse weight and a longest pulse duration which results in a pulse output power at least equal to said maximum theoretical power.

7. The method of configuring a power meter of claim 6 further comprising the steps of:

(a) inputting to said power meter a maximum primary current measurable a current transducer;

(b) inputting to said power meter a voltage for a circuit to be monitored by said power meter; and

(c) inputting to said power meter a system configuration for said circuit to be monitored by said power meter.

8. The method of configuring a power meter of claim 7 wherein said system configuration is one of a single-phase system or a three-phase system.

9. A method of configuring a power meter, said method comprising the steps of:

(a) calculating a maximum theoretical power measurable by said power meter;

(b) calculating a pulse output power for said power meter, said pulse output power comprising a communication pulse having a selected one of a plurality of potential pulse weights of pulses transmissible by said power meter and a maximum pulse duration of a plurality of potential durations of pulses transmissible said power meter;

(c) if said pulse output power is not at least equal to said maximum theoretical power, calculating said pulse output power for a pulse having a next shorter duration of said plurality of potential pulse durations;

(d) if said pulse output power is not at least equal to said maximum theoretical power when calculated with a minimum duration of said plurality of potential pulse durations, calculating said pulse output power for a minimum pulse weight of said plurality of potential pulse weights and said maximum pulse duration;

(e) if said pulse output power is not at least equal to said maximum theoretical power when calculated with a minimum pulse duration of said potential pulse durations, calculating said pulse output power for a next greater pulse weight of said plurality of potential pulse weights transmissible and said maximum pulse duration;

(f) repeating steps (d) and (e) until said pulse output power is at least equal to said maximum theoretical power; and

(g) configuring said power meter to transmit a one of a pulse having said selected pulse weight and a longest pulse duration which results in a pulse output power at least equal to said maximum theoretical power and a pulse having a least pulse weight and a longest pulse duration which results in a pulse output power at least equal to said maximum theoretical power.

10. The method of configuring a power meter of claim 9 further comprising the steps of:

(a) inputting to said power meter a maximum primary current measurable a current transducer;

(b) inputting to said power meter a voltage for a circuit to be monitored by said power meter; and

(c) inputting to said power meter a system configuration for said circuit to be monitored by said power meter.

11. The method of configuring a power meter of claim 10 wherein said system configuration is one of a single-phase system or a three-phase system.

12. A power meter comprising:

(a) a pulse communicator arranged to transmit a series of pulses each having a pulse duration;

(b) a memory storing a plurality of incrementally greater potential pulse weights and a plurality of incrementally longer potential durations for a pulse transmittable by said pulse communicator, a pulse weight indicative of a quantity of energy represented by a pulse; and

(c) a data processing unit arranged to quantify energy measurable by said power meter and to cause said pulse communicator to transmit a plurality of pulses indicative of said measured energy, said data processing unit arranged to select one least pulse weight of said plurality of potential pulse weights and one greatest pulse duration of said plurality of potential pulse durations such that a maximum energy measurable by said power meter does not exceed an output energy represented by a plurality of pulses of said one least pulse weight and said one greatest pulse duration.

13. The power meter of claim 12 wherein said data processing unit is arranged to:

(a) compare said maximum energy measurable by said power meter to an output energy represented by a pulse having a minimum of said potential pulse weights and a maximum of said potential pulse durations;

(b) if said maximum energy measurable by said power meter exceeds said output energy for said pulse of minimum pulse weight and maximum pulse duration, to compare said maximum energy measurable by said power meter to an output energy represented by a pulse having a minimum of said potential pulse weights and a next longer of said potential pulse durations; and

(c) if said maximum energy measurable by said power meter exceeds said output energy represented by a pulse of minimum pulse weight and a maximum of said potential pulse durations, to compare said maximum energy measurable by said power meter to an output energy represented by a pulse having a minimum of said potential pulse durations and a pulse weight greater than said minimum of said potential pulse weights.

14. The power meter of claim 12 wherein said data processing unit is arranged to determine said maximum energy measurable by said power meter from a maximum current sensible by a current transducer, a voltage sensible by a voltage transducer and a configuration of a circuit to be monitored by said power meter.

17. The power meter of claim 14 wherein said data processing unit is arranged to determine said maximum energy measurable by said power meter from a maximum current sensible by a current transducer, a voltage sensible by a voltage transducer and a configuration of a circuit to be monitored by said power meter.

15. A power meter comprising:

(a) a pulse communicator arranged to transmit a series of pulses each having a pulse duration;

(b) a memory storing a plurality of incrementally greater potential pulse weights and a plurality of incrementally longer potential pulse durations for said pulse transmittable by said pulse communicator, a pulse weight indicative of a quantity of energy represented by a pulse; and

(c) a data processing unit arranged to quantify energy measurable by said power meter and to cause said pulse communicator to transmit a plurality of pulses indicative of said measured energy, said data processing unit arranged to select one of;

(i) a pulse having a pulse weight selected by a user and a shortest one of said potential pulse durations if a maximum energy measurable by said power meter does not exceed a first output energy represented by a plurality of pulses of said pulse weight selected by said user and said shortest one of said potential pulse durations; and

(ii) if said maximum energy measurable by said power meter exceeds said first output energy, a pulse having one least pulse weight of said plurality of potential pulse weights and one longest pulse duration of said plurality of potential pulse durations such that said maximum energy measurable by said power meter does not exceed an output energy represented by a plurality of pulses of said one least pulse weight and said one longest pulse duration.

16. The power meter of claim 15 wherein said data processing unit is arranged:

(a) to compare said maximum energy measurable by said power meter to an output energy represented by a pulse having said pulse weight selected by said user and a longest of said potential pulse durations;

(b) if said maximum energy measurable by said power meter exceeds said output energy for said pulse of said pulse weight selected by said user and said longest pulse duration, to compare said maximum energy measurable by said power meter to an output energy represented by a pulse having a pulse weight selected by said user and a next shorter of said potential pulse durations;

(c) if said maximum energy measurable by said power meter exceeds said output energy for said pulse of said pulse weight selected by said user and a shortest of said potential pulse durations, to compare said maximum energy measurable by said power meter to an output energy represented by a pulse having a minimum of said potential pulse weights and a longest of said potential pulse durations;

(d) if said maximum energy measurable by said power meter exceeds said output energy for said pulse of minimum pulse weight and longest pulse duration, to compare said maximum energy measurable by said power meter to an output energy represented by a pulse having a minimum of said potential pulse weights and a next shorter of said potential pulse durations; and

(e) if said maximum energy measurable by said power meter exceeds said output energy represented by a pulse of minimum pulse weight and a maximum of said potential pulse durations, to compare said maximum energy measurable by said power meter to an output energy represented by a pulse having a pulse weight greater than said minimum of said potential pulse weights and a longest of said potential pulse durations.