Method for determining a power consumption, supervision system and electric installation comprising application thereof

• US 9,625,504 B2
• Filed: 12/07/2012
• Issued: 04/18/2017
• Est. Priority Date: 12/20/2011
• Status: Active Grant

• Current Assignee: Schneider Electric Industries SAS (Schneider Electric SE)
• Original Assignee: Schneider Electric Industries SAS (Schneider Electric SE)
• Inventors: Bruel, Marc
• Primary Examiner(s): Nguyen, Tung X
• Assistant Examiner(s): Alejnikov, Jr., Robert P
• Application Number:
  US14/366,565
• Publication Number:
  US 20140333294A1
• Time in Patent Office: 1,593 Days
• Field of Search: 324140 R, 324103 R, 324113, 324114, 324141, 324157
• CPC Class Codes: G01R 19/2513 Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
• CPC Class Codes: G01R 21/06 by measuring current and voltage G01R21/08 - G01R21/133 take precedence
• CPC Class Codes: G01R 21/133 by using digital technique
• CPC Class Codes: G01R 22/061 Details of electronic electricity meters

Abstract

To determine a consumption in a group of branches of individual distribution of electrical energy, a method includes: a) detecting a change in electrical consumption in the branches, b) reading information relating to an electric current in a specific branch, then c) using the information, establishing an indication according to which the change took place in the specific branch, then d) determining, using measurements taken of an overall power supply of the group of branches before the change and measurements taken of the overall power supply after the change, in addition to the indication, an individual energy consumption of the specific branch.

Claims

1. A method for determining a power consumption in an electrical installation including a plurality of electricity distribution branches, and an incoming main power line connecting the plurality of electricity distribution branches to an electrical power supply, the method comprising:

measuring a first power on the incoming main power line to identify an overall power consumption by the plurality of electricity distribution branches and recording, as first measurement data, the first power measured on the incoming main power line;

detecting a change in the power consumption in the electrical installation;

measuring a second power on the incoming main power line to identify an overall power consumption by the plurality of electricity distribution branches after the change and recording, as second measurement data, the second power measured on the incoming main power line;

collecting, by a transducer located in a specific branch of the plurality of electricity distribution branches, information relating to an electric current in the specific branch;

determining, by circuitry based on the information collected by the transducer, whether the change occurred in the specific branch;

determining, by the circuitry based on the first measurement data, the second measurement data and a result of the determining of whether the change occurred in the specific branch, an individual power consumption in the specific branch; and

determining, by the circuitry when the specific branch does not include the transducer, the individual power consumption in the specific branch based on the first measurement data, the second measurement data and a plurality of information, wherein

each of the plurality of information relates to a corresponding electric current in each of a rest of the plurality of electricity distribution branches, the rest excluding the specific branch, and

the each of the plurality of information is collected by a corresponding transducer located in the each of the rest of the plurality of electricity distribution branches.

2. The method for determining a power consumption according to claim 1, further comprising:

generating a table that includes a plurality of associations between the plurality of electricity distribution branches and a set of plural manners, the plurality of associations including at least one association between the specific branch and at least one of the set of plural manners, and the set of plural manners being for determining an individual power consumption in a branch;

combining the result of the determining and the table;

selecting a manner from the set of plural manners; and

determining, according to the selected manner, the individual power consumption in the specific branch.

3. The method for determining a power consumption according to claim 2, wherein

the plurality of electricity distribution branches are connected in parallel,

the electrical power supply is an alternating current supply, and

a specific manner from the set of plural manners comprises:

measuring and recording an overall supply voltage of the plurality of electricity distribution branches;

measuring and recording an intensity and phase shift values of an overall supply current of the plurality of electricity distribution branches;

measuring and recording an intensity of a specific individual current flowing in a specific branch of the plurality of electricity distribution branches; and

determining, based on the measuring of the overall supply voltage during the change, the measuring of the intensity and phase shift values of the overall current before and after the change, and the measuring of the intensities of the specific individual current before and after the change, the individual power consumption in the specific branch.

4. The method according to claim 3, wherein

the individual power consumption is determined by adding up, as an unchanged sum, a plurality of individual currents flowing in the plurality of electricity distribution branches with exception of the specific individual current flowing in the specific branch on completion of the change, and comparing the unchanged sum with the measuring of the intensity and phase shift values of the overall current before the change, and

following two conditions are simultaneously complied with:

the overall supply current before the change is equal to a first amount of adding the unchanged sum to the specific individual current before the change, and

the overall supply current after the change is equal to a second amount of adding the unchanged sum to the specific individual current after the change.

5. The method for determining a power consumption according to claim 2, wherein

the plurality of electricity distribution branches are connected in parallel,

the electrical power supply is a direct current supply, and

a specific manner from the set of plural manners comprises:

measuring an overall supply voltage of the plurality of electricity distribution branches;

measuring an intensity of a specific individual current flowing in a specific branch of the plurality of electricity distribution branches; and

determining, based on the measuring of the overall supply voltage and the measuring of the intensity of the specific individual current, the individual power consumption in the specific branch.

6. The method for determining a power consumption according to claim 2, wherein

the one of the set of plural manners for determining the individual power consumption determines that an individual power consumption in one of the plurality of electricity distribution branches is equal to difference between an overall power consumption in the plurality of electricity distribution branches before the change and an overall power consumption in the plurality of electricity distribution branches after the change.

7. A monitoring system of a plurality of electricity distribution branches in an electrical installation, comprising:

a measuring device that measures a first power on an incoming main power line to identify an overall power consumption by the plurality of electricity distribution branches, the incoming main power line connecting the plurality of electricity distribution branches to an electrical power supply;

a memory that records, as first measurement data, the first power measured on the incoming main power line;

a transducer located in a specific branch among the plurality of electricity distribution branches; and

circuitry configured to;

detect a change in a power consumption in the electrical installation, by communicating with at least one of the measuring device and the transducer, wherein the measuring device measures a second power on the incoming main power line to identify an overall power consumption by the plurality of electricity distribution branches after the change and records, on the memory as second measurement data, the second power measured on the incoming main power line;

monitor information relative to an electrical current in the specific branch, the information originating from the transducer;

determine, based on the information originating from the transducer, whether the change occurred in the specific branch;

determine, based on the first measurement data, the second measurement data and a result of the determining of whether the change occurred in the specific branch, an individual power consumption in the specific branch; and

determine, when the specific branch does not include the transducer, the individual power consumption in the specific branch based on the first measurement data before the change, the second measurement data after the change and a plurality of information, wherein

each of the plurality of information relates to a corresponding electric current in each of a rest of the plurality of electricity distribution branches, the rest excluding the specific branch, and

the each of the plurality of information is collected by a corresponding transducer located in the each of the rest of the plurality of electricity distribution branches.

8. The monitoring system according to claim 7, wherein

the circuitry includes a set of plural manners for determining an individual power consumption in a branch of the plurality of electricity distribution branches, and

the circuitry is configured to:

generate a table that includes a plurality of associations between the plurality of electricity distribution branches and a set of plural manners, the plurality of associations including at least one association between the specific branch and at least one of the set of plural manners, and the set of plural manners being for determining an individual power consumption in a branch;

combine the result of the determining and the table;

select a specific manner from the set of plural manners for determining the individual consumption; and

determine the specific individual power consumption according to the selected specific manner.

9. The monitoring system according to claim 7, for an alternating current electrical installation, wherein

the monitoring system is configured to:

measure and record an overall supply voltage of the plurality of electricity distribution branches,

measure and record an intensity and phase shift values of an overall supply current of the plurality of electricity distribution branches,

measure and record an intensity of a specific individual current flowing in a specific branch of the plurality of electricity distribution branches, and

the circuitry is configured to determine the individual power consumption in the specific branch, based on the measuring of the overall supply voltage during the change, the measurings of the intensity and phase shift values of the overall supply current before and after the change, and the measurings of the intensities of the specific individual current before and after the change.

10. The monitoring system according to claim 9, wherein

the circuitry is configured to determine the individual power consumption in the specific branch by adding up, as an unchanged sum, a plurality of individual currents flowing in the plurality of electricity distribution branches with exception of the specific individual current on completion of the change, and comparing the unchanged sum with the measuring of the intensity and phase shift values of the overall supply current before the change, and

following two conditions are simultaneously complied with:

the overall supply current before the change is equal to a first amount of adding the unchanged sum to the specific individual current before the change, and

the overall supply current after the change is equal to a second amount of adding the unchanged sum to the specific individual current after the change.

11. The monitoring system according to claim 7, wherein

the circuitry is configured to determine that an individual power consumption in one of the plurality of electricity distribution branches is equal to difference between an overall power consumption in the plurality of electricity distribution branches before the change and an overall power consumption in the plurality of electricity distribution branches after the change.

12. A monitoring system for determining a power consumption in an electrical installation including a plurality of electricity distribution branches, and an incoming main power line connecting the plurality of electricity distribution branches to an electrical power supply, the monitoring system comprising:

circuitry configured to;

measure a first power on the incoming main power line to identify an overall power consumption by the plurality of electricity distribution branches and record, as first measurement data, the first power measured on the incoming main power line;

detect a change in the power consumption in the electrical installation;

measure a second power on the incoming main power line to identify an overall power consumption by the plurality of electricity distribution branches after the change and recording, as second measurement data, the second power measured on the incoming main power line;

monitor information relating to an electric current in a specific branch among the plurality of electricity distribution branches, the information collected by a transducer, and the transducer located in the specific branch;

determine, based on the information collected by the transducer, whether the change occurred in the specific branch;

determine, based on the first measurement data before the change, the second measurement data after the change and a result of the determining of whether or not the change occurred in the specific branch, an individual power consumption in the specific branch; and

determine, when the specific branch does not include the transducer, the individual power consumption in the specific branch based on the first measurement data before the change, the second measurement data after the change and a plurality of information, wherein

each of the plurality of information relates to a corresponding electric current in each of a rest of the plurality of electricity distribution branches, the rest excluding the specific branch, and

the each of the plurality of information is collected by a corresponding transducer located in the each of the rest of the plurality of electricity distribution branches.

13. An electrical installation, comprising:

a plurality of electricity distribution branches between plural loads;

an incoming main power line connecting the plurality of electricity distribution branches to an electrical power supply;

a monitoring system, wherein

a measuring device that measures a first power on an incoming main line to identify an overall power consumption by the plurality of electricity distribution branches,

a specific branch among the plurality of electricity distribution branches including a transducer,

a memory that records, as first measurement data, the first power measured on the incoming main power line, and

circuitry configured to;

detect a change in a power consumption in the electrical installation, by communicating with at least one of the measuring device and the transducer, wherein the measuring device measures a second power on the incoming main power line to identify an overall power consumption by the plurality of electricity distribution branches after the change and records, on the memory as second measurement data, the second power measured on the incoming main power line;

monitor information relative to an electrical current in the specific branch, the information originating from the transducer located in the specific branch;

determine, based on the information originating from the transducer whether the change occurred in the specific branch; and

determine, based on the first measurement data before the change, the second measurement data after the change and a result of the determining of whether the change occurred in the specific branch, an individual power consumption in the specific branch; and

determine, when the specific branch does not include the transducer, the individual power consumption in the specific branch based on the first measurement data before the change, the second measurement data after the change and a plurality of information, wherein

each of the plurality of information relates to a corresponding electric current in each of a rest of the plurality of electricity distribution branches, the rest excluding the specific branch, and

the each of the plurality of information is collected by a corresponding transducer located in the each of the rest of the plurality of electricity distribution branches.