EP4241096A1 - Monitoring of power-electric devices - Google Patents
Monitoring of power-electric devicesInfo
- Publication number
- EP4241096A1 EP4241096A1 EP21836018.8A EP21836018A EP4241096A1 EP 4241096 A1 EP4241096 A1 EP 4241096A1 EP 21836018 A EP21836018 A EP 21836018A EP 4241096 A1 EP4241096 A1 EP 4241096A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- auxiliary
- control unit
- monitoring arrangement
- designed
- voltage source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 48
- 238000012423 maintenance Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims description 17
- 238000005259 measurement Methods 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 4
- 230000003595 spectral effect Effects 0.000 claims description 4
- 238000013528 artificial neural network Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000003466 anti-cipated effect Effects 0.000 abstract 2
- 238000004891 communication Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000010801 machine learning Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
- G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
Definitions
- the invention relates to a monitoring arrangement for a power electrical device, a power electrical device with such a monitoring arrangement, a method for monitoring a power electrical device and a data carrier with a computer program for carrying out the method.
- Power electrical devices such as air- or gas-insulated medium-voltage switchgear or substations usually include one or more auxiliary functional units in addition to a main functional unit such as circuit breakers or transformers.
- auxiliary functional units support the main functional unit and allow, among other things, a change in the operating state of the main functional unit.
- the circuit breaker can be opened or closed by spring drives, the springs built into the spring drives being tensioned or kept compressed in order to be able to perform a switching operation of the circuit breaker as quickly as possible.
- the spring drive can be triggered, for example, by a solenoid as a further auxiliary functional unit of the power-electrical device.
- the springs can then be tensioned or compressed again by other auxiliary functional units such as electric motors.
- auxiliary functional units can be provided, for example, for changing a winding tap of a transformer winding. More examples of Auxiliary functional units are cooling units such as coolant pumps and the like.
- the functioning of the main functional unit depends on that of the auxiliary functional units. If an auxiliary functional unit fails, the main functional unit can no longer be operated properly. Therefore, high maintenance is operated in order to prevent an unexpected failure of the power electrical device.
- the object of the invention is to provide means and methods that enable high reliability of a power electrical device with low operating costs.
- the invention therefore introduces a monitoring arrangement for a power electrical device according to claim 1, a power electrical device with such a monitoring arrangement according to claim 8, a method for monitoring a power electrical device according to claim 11 and a data carrier with a computer program for carrying out the method according to claim 12.
- Preferred embodiments of the invention form the subject matter of the dependent claims.
- a first aspect of the invention relates to a monitoring arrangement for a power electrical device and having an input for an auxiliary voltage source, an output for the auxiliary voltage source and a sensor connected between the input and the output and connected to a control unit.
- the sensor is designed to detect a current flowing between the input and the output and to transmit it to the control unit as a measured current value.
- the sensor can be, for example, a Hall probe or a measuring resistor of a known size and one to which the Output a voltage signal proportional to the current flowing in the sensor as a measured current value. It is also possible for the sensor to additionally include an analog/digital converter, so that the measured current value can be transmitted to the control unit as a digital value.
- the auxiliary voltage source will usually be an independent functional unit of the electrical power device and is used to supply the (additional) auxiliary functional units of the electrical power device with electricity.
- the auxiliary voltage source can be supplied via a battery and/or a supply network and can in particular make one or more DC voltages available.
- control unit is designed to identify, in a series of measured current values, a characteristic progression of an event in an auxiliary functional unit of the power electrical device supplied by the output for the auxiliary voltage source.
- a switch-on event can be characterized by a brief increase in the current, with time periods and amplitudes that are characteristic of the type of event and its source (ie that auxiliary functional unit in which the event occurred) being given.
- the invention is based on the insight that the various events in the auxiliary functional units leave a kind of fingerprint in the flow recorded by the auxiliary functional units.
- control unit is also designed to compare the identified characteristic curve with an expected characteristic curve and to emit a maintenance signal depending on a deviation between the identified characteristic curve and the expected characteristic curve.
- the control unit can, for example, output the maintenance signal to a remote control center via a wireless or wired communication interface, so that a suitable maintenance measure can be initiated from there.
- the monitoring arrangement of the invention has the advantage that changes in the characteristic curves due to aging or other impairment of the auxiliary functional units can be noticed and conclusions can be drawn as to the need for a maintenance measure.
- the invention makes it possible to monitor a plurality of auxiliary functional units supplied by the auxiliary voltage source with just a single sensor, so that the monitoring arrangement of the invention can be implemented cost-effectively.
- control unit does not necessarily have to be arranged at the location of the power-electrical device, but can itself be implemented remotely or as an arrangement distributed over a number of units and locations.
- a control unit can be provided jointly for a number of power-electrical devices, so that knowledge about events in a power-electrical device can also be used for monitoring other power-electrical devices. This makes sense, for example, when the expected characteristic curves are modified during operation of the monitoring arrangement based on the events that actually occurred, for example by using machine learning.
- control unit can differentiate and evaluate different types of events and different or similar events in different auxiliary functional units.
- the invention makes this possible in an advantageous manner in that the sensor is connected to the auxiliary power supply at a functionally central point of the electrical power supply Device is arranged at which the information contained in the flowing current about the events come together.
- the control unit can also be designed to recognize events that overlap in time.
- the sensor can be designed to detect the current with a sampling rate between 1 and 50 kHz, preferably between 5 and 30 kHz, particularly preferably between 8 and 20 kHz. With these sampling rates, on the one hand, sufficient measured current values are available for recognizing a characteristic course, and on the other hand, such a monitoring arrangement can still be implemented cost-effectively.
- the control unit is preferably designed to assign the identified characteristic curve to an event type from a plurality of predetermined event types. This makes it possible to determine which type of event was recognized by the monitoring arrangement, which in turn allows conclusions to be drawn about an auxiliary functional unit of the power electrical device typically executing the event as the source of the event. Because the causative auxiliary functional unit or a specific causative component of the auxiliary functional unit is identified based on the event type, it can also be determined about which functional unit or component a statement was made based on the deviation between the identified characteristic curve and the expected characteristic curve fen will .
- the control unit can be designed, for example, to form respective cross-correlations between the series of measured current values and a plurality of default curves, each of which describes one of the predetermined event types, and the characteristic curve in the series of measured current values as a function of the respective results of the cross-correlations to recognize and to assign the recognized characteristic course to one of the predetermined event types put in order .
- the control unit of the monitoring arrangement can be equipped with a neural network which is designed to recognize the characteristic progression in the series of measured current values.
- a neural network can be used in particular within the framework of machine learning, as a result of which the quality of the maintenance signals from the monitoring arrangement can be increased in terms of time and accuracy over time. This is the case in particular when recognized characteristic curves from a large number of power-electrical devices are combined and the expected characteristic curves are adapted over time by way of machine learning.
- control unit can be designed to determine a spectral representation of the series of measured current values and to identify the characteristic curve based on the spectral representation.
- design variants can also be combined with the aforementioned approaches to machine learning.
- the control unit is preferably designed to determine a degree of correspondence of the deviation between the detected characteristic curve and the expected characteristic curve with a plurality of predetermined error patterns and to output the maintenance signal if the degree of correspondence for at least one of the predetermined error patterns exceeds a threshold value exceeds .
- the control unit is also designed to use the maintenance signal to output information about the at least one error pattern for which the degree of agreement has exceeded the threshold value.
- the information can be used to determine the cause of the deviation of the detected characteristic curve from the expected characteristic curve and direct the maintenance measure to be carried out to eliminating the cause.
- the information can help to identify a slackening spring of a spring drive, a sluggish gear or needed to recognize and assign brushes of an electric drive unit, a delayed triggering relay or the like.
- a second aspect of the invention relates to a power-electrical device with a power-electrical main functional unit, an auxiliary voltage source, at least one auxiliary functional unit for operating the main functional unit and a monitoring arrangement connected between the auxiliary voltage source and the at least one auxiliary functional unit according to the first aspect of invention .
- the power electrical main functional unit can be, for example, a switch (e.g. load switch or circuit breaker), a short-circuiter, an arc quencher or a transformer, but the invention can also be applied to other types of power electrical systems in the field of high-voltage, medium-voltage or High voltage technology are applied.
- a switch e.g. load switch or circuit breaker
- a short-circuiter e.g. arc quencher or a transformer
- the auxiliary functional unit can in particular be an auxiliary switch or an auxiliary motor.
- Another aspect of the invention introduces a method for monitoring a power electrical device.
- the method has at least the following steps:
- the invention also relates to a data carrier with a computer program that, from a control unit of a high-performance running electrical device that carries out the method according to the invention.
- FIG. 1 shows an exemplary embodiment of a power electrical device according to the invention
- FIG. 2 shows an exemplary embodiment of a monitoring arrangement according to the invention.
- FIG. 3 shows an exemplary embodiment of a method according to the invention for monitoring a power-electrical device.
- FIG. 1 shows an exemplary embodiment of a power electrical device 1 according to the invention.
- the power electrical device 1 can be, for example, a ventilation or gas-insulated high or medium voltage switchgear, a substation or the like.
- the power electrical device 1 comprises a main functional unit 5, which can accordingly be a switch with vacuum interrupters, a transformer with several taps or another power electrical functional unit.
- the power electrical device 1 also has two auxiliary functional units 4 which can be configured differently depending on the type of main functional unit 5 .
- the auxiliary functional units 4 can be auxiliary drives for tensioning or compressing the spring of a Act spring drive or a cooling device with a coolant compressor.
- the auxiliary function units 4 are powered by an auxiliary voltage supply 3, the auxiliary voltage supply 3 also being able to provide several different voltage levels and voltage formats (DC voltage and/or AC voltage with different amplitudes, etc.) at the same time, depending on the needs of the auxiliary function units 4.
- a monitoring arrangement 2 is connected between the auxiliary voltage source 3 and the auxiliary functional units 4, which monitors the current provided by the auxiliary voltage source 3 for the auxiliary functional units 4 in order to assess the auxiliary functional units 4 and in particular their technical state of health. If the auxiliary voltage source 3 provides a number of different voltages, the monitoring arrangement 2 can be designed to monitor a number or all of these different voltages.
- the monitoring arrangement 2 is intended to detect events in the auxiliary functional units 4 based on variations in the power consumption of the auxiliary functional units 4, with a single monitoring arrangement 2 being sufficient for a number of auxiliary functional units 4, since the auxiliary functional units 4 are supplied from the same auxiliary voltage source 3. It is true that events occurring in close succession or simultaneously can lead to an overlapping of the variations in the power consumption, but these can be separated from one another in terms of signaling.
- the monitoring arrangement 2 can thus monitor a complex power-electrical device 1 with little effort and, in particular, can also be subsequently installed in a power-electrical device 1 with little effort.
- the monitoring arrangement 2 offers the advantage of being able to examine characteristic curves assigned to the same event type for long-term changes and further deviations from expected characteristic curves, as a result of which conclusions can be drawn about the state of health of the auxiliary functional units 4 supplied by the auxiliary voltage source 3. Accordingly, the monitoring arrangement 2 can output a maintenance signal, which indicates, for example, the need for maintenance, the type of error that is expected or present and, if applicable, the type of maintenance required.
- FIG. 2 shows an exemplary embodiment of a monitoring arrangement 2 according to the invention.
- the monitoring arrangement 2 includes a sensor 8 which is connected between an input 12 and an output 13 for the auxiliary voltage source 3 of the power electrical device 1 and serves to detect the current provided by the auxiliary voltage source 3 to the auxiliary functional units 4 .
- the sensor 8 includes, merely by way of example, a measuring resistor 9 through which the current flows, and a voltage measuring unit 10 which records the voltage caused by the current across the measuring resistor 9 . This voltage is proportional to the current, so it can serve as a measurement signal.
- the sensor 8 can, for example, record measured current values with a clock frequency in the kilohertz range and transmit them to a control unit 7, which carries out the technical evaluation of the measured current values.
- the control unit 7 can be arranged locally or at a distance from the sensor 8 . example In this way, it is possible to arrange only the sensor 8 of the monitoring arrangement 2 within the switchgear or substation that forms the core of the power-electrical device, and to connect the other functional units of the monitoring arrangement 2 to the sensor 8 via a wired, wireless, optical or other data connection associate .
- the control unit 7 can be connected to a memory 11, for example, in which program code and/or measured current values and temporary and persistent data generated during processing can be stored.
- the monitoring arrangement 2 also has a communication interface 6 which is connected to the control unit 7 and via which a maintenance signal of the type described above can be output.
- the maintenance signal can also merely represent an audio or light signal, so that the communication interface 6 can accordingly be omitted.
- FIG. 3 shows an exemplary embodiment of a method according to the invention for monitoring a power electrical device 1 .
- the method begins in a starting step S 0 and continues with a first step S 1 in which the current of the auxiliary voltage source 3 is recorded in a series of current measurement values.
- This step S 1 can be carried out continuously and in parallel with the further method steps.
- step S2 the series of measured current values is examined for the presence of a characteristic curve and such a curve—if any—is recognized.
- step S3 the identified characteristic curve is compared with an expected characteristic curve. In this case, an event type of the event causing the characteristic course can also be determined.
- step S4 it is checked whether there is a discrepancy between the recognized characteristic course and the expected racteristic course exceeds a predetermined threshold value. If this is not the case, it is concluded that the auxiliary functional unit in which the causative event occurred is healthy and does not require any maintenance. In this case, the method branches back to the start of the method. In the other case, the process continues with step S5, in which a maintenance signal is output to indicate the need for a maintenance measure.
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Testing And Monitoring For Control Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020216013.9A DE102020216013A1 (en) | 2020-12-16 | 2020-12-16 | Monitoring of power electrical equipment |
PCT/EP2021/084337 WO2022128558A1 (en) | 2020-12-16 | 2021-12-06 | Monitoring of power-electric devices |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4241096A1 true EP4241096A1 (en) | 2023-09-13 |
Family
ID=79231089
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21836018.8A Pending EP4241096A1 (en) | 2020-12-16 | 2021-12-06 | Monitoring of power-electric devices |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4241096A1 (en) |
DE (1) | DE102020216013A1 (en) |
WO (1) | WO2022128558A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9864008B2 (en) * | 2014-03-31 | 2018-01-09 | Schweitzer Engineering Laboratories, Inc. | Electric power system circuit breaker trip diagnostic |
PT3328771T (en) * | 2015-07-29 | 2019-12-09 | Inventio Ag | Method and device for determining the operating condition of a lift system |
EP3306329B1 (en) * | 2016-10-07 | 2020-01-15 | Technische Universität Graz | Method for central monitoring of changes in state of a number of components for high voltage systems from 1 kv upwards |
CN107450017B (en) | 2017-08-04 | 2020-04-28 | 内蒙古电力(集团)有限责任公司包头供电局 | Intelligent detection system for defects of switch equipment |
BE1026844B1 (en) * | 2018-12-07 | 2020-07-08 | Phoenix Contact Gmbh & Co | Device and method for detecting wear of an electromechanical switching device |
DE102020209017A1 (en) | 2020-07-20 | 2022-01-20 | Siemens Aktiengesellschaft | Error detection in spring storage systems of medium-voltage circuit breakers |
-
2020
- 2020-12-16 DE DE102020216013.9A patent/DE102020216013A1/en active Pending
-
2021
- 2021-12-06 WO PCT/EP2021/084337 patent/WO2022128558A1/en unknown
- 2021-12-06 EP EP21836018.8A patent/EP4241096A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2022128558A1 (en) | 2022-06-23 |
DE102020216013A1 (en) | 2022-06-23 |
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