BUS TERMINAL FOR AUTOMATION SYSTEM AND METHOD FOR MONITORING A CURRENT-SUPPLY NETWORK

• US 20200132738A1
• Filed: 12/23/2019
• Published: 04/30/2020
• Est. Priority Date: 11/24/2017
• Status: Active Grant

• Current Assignee: Beckhoff Automation GmbH
• Original Assignee: Beckhoff Automation GmbH
• Inventors: Assion, Fabian, Lienen, Christian, Ens, Jakob
• Granted Patent: US 11,187,733 B2
• Time in Patent Office: Days
• CPC Class Codes: G01R 19/175 Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
• CPC Class Codes: G01R 19/2513 Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
• CPC Class Codes: G01R 21/1331 Measuring real or reactive component, measuring apparent energy
• CPC Class Codes: H02H 7/261 involving signal transmission between at least two stations transmission of signals in general H02H1/0061
• CPC Class Codes: H02H 7/30 Staggered disconnection
• CPC Class Codes: H02J 13/00002 characterised by monitoring
• CPC Class Codes: H02J 13/00028 involving the use of Internet protocols
• 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: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/30 State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge

Abstract

Measuring data are provided for monitoring a current-supply network, based on one or a plurality of measured electrical quantities of the current-supply network. A time signal is assigned to the measuring data. The measuring data are inspected for the occurrence of one a plurality of predetermined events. Based on determining the occurrence of predetermined event or events, corresponding event data based on the measuring data are generated. A time stamp is conferred to the event data, where the time stamp is based on a link of a synchronized clock time provided by a clock and the time signal assigned to the measuring data. User data are generated from the event data comprising the time stamp, and transmitted via a communication network.

Claims

1. A bus terminal for an automation system for monitoring a current-supply network, wherein the bus terminal comprises:

a first clock,

a communication interface for communicating via a communication network of an automation system,

wherein the communication network is configured to receive a reference time via the communication network,

wherein the communication interface is configured to synchronize the clock time of the first clock with the reference time,

a measuring converter configured as a digitizer for measuring one or a plurality of electrical quantities of the current-supply system in order to provide digital measuring data correspondingly based on the one or on the plurality of measured electrical quantities, and

a processor unit comprising;

a second clock configured to generate a time signal based on a provision signal supplied to the second clock by the measuring converter, wherein the second clock is furthermore configured to trigger the first clock to periodically provide the synchronized clock time,

a first link unit configured to assign the time signal to the provided digital measuring data,

a searching unit configured to inspect the provided digital measuring data and/or the first derived data based on the provided digital measuring data for the occurrence of one or a plurality of predetermined events in order to generate event data based on the digital measuring data and/or on the first derived data of the event or of the events on the basis of determining the occurrence of one or a plurality of predetermined events, and

a second link unit configured to confer a time stamp to the event data and/or to the derived data based on the event data in order to generate user data in this way, wherein the time stamp is based on a linking of the synchronized clock time provided by first clock and the time signal assigned to the digital measuring data of the event or of the events,

wherein the communication interface is configured to transmit the generated user data via the communication network.

2. The bus terminal according to claim 1, wherein the processor unit comprises a first evaluation unit that receives the digital measuring data assigned by the time signal from the first link unit, wherein the first evaluation unit is configured to link the digital measuring data to further digital measuring data and/or to process the digital measuring data by a mathematical function in order to generate first derived data that is supplied to the searching unit.

3. The bus terminal according to claim 1, wherein the processor unit comprises a second evaluation unit receiving the event data from the searching unit, wherein the second evaluation unit is configured to link the event data to further event data and/or to further digital measuring data and/or to process the event data by a mathematical function in order to generate second derived data in this way that is supplied to the second link unit.

4. The bus terminal according to claim 1, wherein the one or the plurality of predetermined events are selected from the following group of events:

a voltage drop in the current-supply network below a predetermined voltage-threshold value,

a current drop in the current-supply network below the predetermined current-threshold value,

a current increase in the current-supply network over a predetermined current-threshold value,

a chronological development of a measured electrical quantity corresponding to a predetermined desired time development or deviating from it, and/or

the occurrence of a zero crossing of a phase in a current-supply network configured as an a.c. network.

5. The bus terminal according claim 1, comprising a memory for storing one or a plurality of programs for inspecting by the searching unit for generating first derived data by the first evaluating unit and/or for generating second derived data by the second evaluating unit, wherein the processor unit is configured to read out and execute the program or the programs stored in the memory, wherein the communication interface is configured to receive the program or the programs and/or update data for the program or the programs via the communication network, wherein the processor unit is configured to store the received program or programs in the memory and/or to update the program or programs based on the update data.

6. A method for monitoring a current-supply network, comprising the following steps:

receiving a reference time via a communication network,

synchronizing a clock time of a first clock to a reference time,

measuring one or a plurality of electrical quantities of the current-supply network by a measuring converter configured as a digitizer,

providing digital measuring data based on the one or plurality of measured electrical quantities,

supplying a provision signal from the measuring converter to a second clock as soon as digital measuring data have been provided,

generating a time signal on the part of the second clock when the provision signal is supplied,

periodic triggering of the first clock to provide a synchronized clock time on the part of the second clock,

assigning a time signal to the provided digital measuring data,

inspecting the provided digital measuring data and/or first derived data based on the provided digital measuring data for the occurrence of one or a plurality of predetermined events,

based on determining the occurrence of one or a plurality of predetermined events, generating of corresponding event data based on the digital measuring data and/or on first derived data of the event or events,

conferring a time stamp to the event data and/or to the second derived data based on the event data, wherein the time stamp is based on a link of the synchronized clock time provided by the first clock and the time signal assigned to the digital measuring data of the event or of the events,

generating of user data from the event data comprising the time stamp and/or from the second derived data comprising the time stamp on which the event data are based, and

transmitting the generated user data via the communication network.

7. The method according to claim 6, comprising the further steps:

receiving digital measuring data assigned by the time stamp from a first evaluation unit,

generating first derived data by linking the digital measuring data with further digital measuring data and/or processing the digital measuring data by a mathematical function, and

supplying the first derived data to the searching unit.

8. The method according to claim 6, comprising the further steps:

receiving the event data from a second evaluation unit,

generating second derived data by linking the event data to further event data and/or processing the event data by a mathematical function, and

supplying the second derived data to the second link unit.

9. A method for monitoring a current-supply network, comprising the following steps:

providing measuring data based on the one or plurality of measured electrical quantities of the current-supply network,

assign a time signal to the provided measuring data,

inspecting the provided measuring data for the occurrence of one or a plurality of predetermined events,

based on determining the occurrence of one or a plurality of predetermined events, generating of corresponding event data based on the measuring data,

conferring a time stamp to the event data, wherein the time stamp is based on a link of a synchronized clock time provided by a clock and the time signal assigned to the measuring data of the event,

generating of user data from the event data comprising the time stamp, and

transmitting the generated user data via ae communication network.

10. The method according to claim 9, wherein the one or the plurality of predetermined events are selected from the following group of events:

a voltage drop in the current-supply network below a predetermined voltage-threshold value,

a current drop in the current-supply network below the predetermined current-threshold value,

a current increase in the current-supply network over a predetermined current-threshold value,

a chronological development of a measured electrical quantity corresponding to a predetermined desired time development or deviating from it, or

the occurrence of a zero crossing of a phase in a current-supply network configured as an a.c. network.

11. The method according to claim 9, comprising the following steps:

receiving a reference time via a communication network,

synchronizing a clock time of a first clock to a reference time,

measuring one or a plurality of electrical quantities of the current-supply network,

providing the measuring data based on the one or plurality of measured electrical quantities,

supplying a provision signal to a second clock as soon as the measuring data have been provided,

generating the time signal on the part of the second clock when the provision signal is supplied,

periodic triggering of the first clock to provide a synchronized clock time on the part of the second clock,

assigning the time signal to the provided measuring data,

inspecting the provided measuring data for the occurrence of one or a plurality of predetermined events,

based on determining the occurrence of one or a plurality of predetermined events, generating of the event data based on the measuring data,

conferring the time stamp to the event data, wherein the time stamp is based on a link of the synchronized clock time provided by the first clock and the time signal assigned to the measuring data of the event or of the events,

generating of the user data from the event data comprising the time stamp, and

transmitting the generated user data via the communication network.

12. The method according to claim 11, comprising the further steps:

receiving measuring data assigned by the time stamp from a first evaluation unit,

generating first derived data by linking the measuring data with further measuring data and/or processing the measuring data by a mathematical function, and

supplying the first derived data to the searching unit.

13. The method according to claim 12, comprising the further steps:

receiving the event data from a second evaluation unit,

generating second derived data by linking the event data to further event data and/or processing the event data by a mathematical function, and

supplying the second derived data to the second link unit.