Power monitor apparatus and method with object oriented structure

• US 5,828,576 A
• Filed: 03/03/1997
• Issued: 10/27/1998
• Est. Priority Date: 12/30/1994
• Status: Expired due to Term

• Current Assignee: Power Measurement Ltd. (Schneider Electric SE)
• Original Assignee: CD Power Measurement Limited
• Inventors: Dravnieks, Olaf O.W., Loucks, Gregory R., Chivers, David A., Ransom, Douglas S., Hart, Ronald G., Teachman, Michael E., Ki, Chuen Shan Simon
• Primary Examiner(s): Voeltz, Emanuel Todd
• Assistant Examiner(s): VO, HIEN XUAN
• Application Number:
  US08/810,358
• Time in Patent Office: 603 Days
• Field of Search: 364/483, 364/488, 364/489, 364/578, 364/580, 395/500, 395/601, 395/701, 324/118, 324/119, 324/142, 340/825.06
• US Class Current: 702/65
• CPC Class Codes: G01R 19/2513 Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
• CPC Class Codes: G01R 21/133 by using digital technique
• CPC Class Codes: G01R 22/00 Arrangements for measuring time integral of electric power or current, e.g. electricity meters
• CPC Class Codes: H02H 1/0061 concerning transmission of signals transmission of measured quantities or switching orders; sectionalised protection involving signal transmission between at least two stations H02H7/261; comparison of the voltage or current values at two spaced portions of a single system H02H3/28; transferring the output of a sensing member to another variable G01D5/00; electrical measuring arrangements using modulation of electromagnetic waves, e.g. light beams G01R15/24, G01R15/26
• CPC Class Codes: H02J 13/00 Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H02J 13/0004 involved in a protection system
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/18 using switches, relays or circuit breakers, e.g. intelligent electronic devices [IED]
• CPC Class Codes: Y10S 707/99931 Database or file accessing

Abstract

An object oriented architecture is used within individual monitoring units. The monitoring devices include circuitry which receives an electrical signal and generates at least one digital signal representing the electrical signal. Objects within such individual monitoring units include modules which perform a function and registers which contain the inputs, outputs and setup information for the modules. Methods can be invoked on all objects to change or query the operation or configuration of the device. At least one of the modules receives the digital signal as an input and uses the signal to generate measured parameters. Additional modules take measured parameters as input and generate additional parameters therefrom. The module may be linked in an arbitrary manner to form arbitrary functional blocks.

Claims

1. A digital device comprising:

a processor;

object logic operatively connected to be executed by the processor, the object logic comprising a plurality of independent modules, each module defined by an active object which receives a message and executes a predefined method and which can invoke methods on other objects;

the object logic comprising a plurality of manager modules, each of the manager modules organizing a plurality of objects into a hierarchical structure and providing access to all objects below the manager in the hierarchy; and

one of the manager modules comprising a feature manager which organizes the other manager modules into a hierarchical structure from which the entire configuration of the digital device can be ascertained.

2. The digital electronic device of claim 1 wherein the manager modules can create other modules.

3. The digital device of claim 1 wherein the object logic further comprises a plurality of registers defining server objects which can respond to method invocations from the modules.

4. The digital device of claim 3 wherein the registers are linked to respective modules and wherein at least one link between one of the modules and one of the registers is programmable.

5. The digital device of claim 3 wherein the manager module can destroy modules.

6. The intelligent electronic device of claim 3 wherein a method can be invoked on the manager module to determine the addresses of the module which exist in the hierarchy.

7. The intelligent electronic device of claim 1 wherein a method can be invoked on the manager module to determine what modules exist in the hierarchy of the manager module.

8. The intelligent electronic device of claim 1 wherein the object logic comprises logic to determine if any module in the manager'"'"'s hierarchy has been reconfigured, and wherein a method can be invoked on the manager module to determine if any module in the manager'"'"'s hierarchy has been reconfigured.

9. The intelligent electronic device of claim 1 wherein the object logic comprises logic to determine if any module in the manager'"'"'s hierarchy has been updated, and wherein a method can be invoked on the manager module to determine if any module in the the manager'"'"'s hierarchy has been updated.

10. The digital device of claim 1 wherein the object logic comprises an event log module, with associated event log registers which record the cause of events which occur in the digital device.

11. The digital device of claim 7 wherein the event log module and associated event log registers record the time of events which occur in the digital device.

12. The digital device of claim 10 wherein the event log module and associated event log registers record the effect of the events.

13. The digital device of claim 1 wherein the modules are configured such that a plurality of modules can be arbitrarily linked to form arbitrary functional blocks.

14. The digital device of claim 1 wherein at least one of the modules comprises a module operatively connected to receive a digital signal as an input and generate measured parameters therefrom.

15. A monitoring system for monitoring a plurality of parameters, the system comprising;

a plurality of digital devices, each including a processor, object logic operatively connected to be executed by the processor, the object logic comprising a plurality of independent modules, each module defined by an active object which receives input data and generates data according to a predefined function and which can invoke methods on other output objects, and at least one of the modules comprising a module operatively connected to receive a message as input data and generate parameters therefrom;

a computer including a processor and object logic comprising a plurality of independent modules, each module defined by an active object which receives input data and generates output data according to a predefined function and which can invoke methods on other objects including the modules on the plurality of digital devices, the object logic defining a virtual digital device; and

a communication network connecting the plurality of digital devices to the central computer.

16. A digital device comprising:

a processor;

object logic operatively connected to be executed by the processor, the object logic comprising a plurality of independent modules, each module defined by an active object which receives input data and generates output data according to a predefined function and which can invoke methods on other objects;

at least one of the modules comprising a manager module which organizes objects into a hierarchical structure.

17. The digital device of claim 16 wherein the object logic further comprises a plurality of manager modules, each of the manager modules organizing a plurality of objects into a hierarchical structure and providing access to all objects below the manager in the hierarchy.

18. The digital device of claim 16 wherein said manager module comprises a feature manager which organizes other manager modules into a hierarchical structure from which the entire configuration of the digital device can be ascertained.