EP3928393A1 - Elektroenergieübertragungseinrichtung sowie analyseverfahren - Google Patents
Elektroenergieübertragungseinrichtung sowie analyseverfahrenInfo
- Publication number
- EP3928393A1 EP3928393A1 EP20710803.6A EP20710803A EP3928393A1 EP 3928393 A1 EP3928393 A1 EP 3928393A1 EP 20710803 A EP20710803 A EP 20710803A EP 3928393 A1 EP3928393 A1 EP 3928393A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- data
- electrical energy
- energy transmission
- transmission device
- interface
- 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.)
- Withdrawn
Links
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- 238000000034 method Methods 0.000 claims description 10
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- 239000004020 conductor Substances 0.000 description 21
- 238000005538 encapsulation Methods 0.000 description 8
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/065—Means for detecting or reacting to mechanical or electrical defects
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0224—Process history based detection method, e.g. whereby history implies the availability of large amounts of data
- G05B23/024—Quantitative history assessment, e.g. mathematical relationships between available data; Functions therefor; Principal component analysis [PCA]; Partial least square [PLS]; Statistical classifiers, e.g. Bayesian networks, linear regression or correlation analysis; Neural networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/065—Means for detecting or reacting to mechanical or electrical defects
- H02B13/0655—Means for detecting or reacting to mechanical or electrical defects through monitoring changes of gas properties
Definitions
- the invention relates to an electrical energy transmission device with a state detection arrangement having a switching device and at least one first data supplier, which is connected to a first interface of the switching device.
- An electrical energy transmission device is used to transmit electrical energy. It is known to equip electrical energy transmission devices with a state detection arrangement which has a switching device and at least one first data supplier which is connected to an interface of the connecting device. With increasing automation, it is desirable to receive a large number of information from an electrical power transmission device and to process them accordingly. With increasing amounts of information, greater demands are placed on the performance of the switching devices. Correspondingly, the effort for an improved information acquisition at Elektro energieübertra transmission devices increases.
- the object of the invention is to provide an electrical energy transmission device which enables an improved use of a switching device with an increased number of information supplied.
- the object is achieved with an electrical energy transmission device of the type mentioned at the outset in that a second data supplier is connected to the first
- Electrical energy transmission devices are devices which are used to transmit electrical energy. Electrical Energy transmission devices are, for example, disconnectors, earthing switches, load switches, circuit breakers, instrument transformers, gas-insulated switchgear, outdoor bushings, surge arresters, transformers in outdoor and indoor versions, etc. Driven by a voltage difference, an electrical current is carried within a phase conductor. The phase conductor must be electrically insulated accordingly.
- the operational safety of an electrical energy transmission device is determined, among other things, by the insulation strength of the insulation medium used (electrically insulating medium). In this respect, the condition of the insulation medium is important information for making statements regarding the operational safety of the electrical energy transmission devices.
- the insulation media generally extend over greater distances, so that on the one hand monitoring that is as precise as possible is desired, but on the other hand the effort for such monitoring is high.
- Fluids that wash around a phase conductor for example, are used as the insulation medium.
- Gaseous fluids in particular have proven to be suitable.
- These are to be housed accordingly in capsule housings, within which a phase conductor is at least partially arranged. There the electrically insulating medium washes around the phase conductor and ensures electrical insulation.
- first data supplier data on the condition of the insulating medium or other information on the condition, such as temperatures, changes in mass, arcing phenomena, etc., can be recorded.
- first data supplier and second data supplier it should advantageously be provided that the data suppliers who are connected to the same interface allow the detection of similar states (Zu).
- the first data supplier and the second data supplier can determine data relating to the density of an electrically insulating serving medium.
- the first and the second data provider can also provide different status information.
- several data providers which are assigned, for example, to electrically insulating media that act independently of one another, to transmit data about similar states of the respective media to the first interface.
- electrically insulating gas spaces sealed off from one another with corresponding enclosed electrically insulating fluids are used, whereby the information about the state, in particular the density of the electrically insulating fluid in mutually different gas spaces is recorded will.
- the switching device can have a first interface and, in addition to the first interface, further interfaces.
- analog measured values that are supplied by the data suppliers can be transmitted in phase to the first interface from the first and the second supplier. This enables the information supplied by the first interface and the second interface to be continuously added.
- a further advantageous embodiment can provide that data from the first and second data suppliers are made available to the first interface in a timed manner.
- the data supplied by the first and second data suppliers can be made available to the first interface in a timed manner.
- the information from the first and second data suppliers can be transmitted to the first interface in succession. This avoids overlaying the information supplied by the data provider to the same interface. For example, this can be done in such a way that a multiplexer is used to assign information from the first data supplier and the second data supplier to the interface over time. Instead of a multiplexer, clocking can also be done by the data providers themselves.
- a time signal can be assigned to the respective information from the first data supplier or from the second data supplier and this time signal can also be assigned to higher-level processing devices are transmitted, so that a temporal breakdown of the information supplied by the first and second data providers is possible, please include.
- a further advantageous embodiment can provide that the data from the first and second data suppliers are clocked in an asymmetrically distributed manner.
- asymmetrical clocking can also be provided. I.e. one of the data providers is assigned a different time interval. The other data provider (s) can each be allocated the same time window.
- the asymmetrical clocks can also regularly check and compare the transmitted information, since the different time clock can be used as test information.
- the fuse device has a current divider.
- status information about an insulation medium is important for a description of the operational safety of an electrical energy transmission device.
- the temperature of the insulation medium or the density of the insulation medium can provide information on whether the insulation strength of the same is still given.
- the density allows sufficient information about the insulation strength.
- the density enables temperature and pressure-independent information about the insulation strength of the insulating medium. If necessary, a standardized detection of the pressure based on a standardized temperature (for example 20 ° C. ambient temperature) can also take place, so that information about the insulation strength of the insulating medium can also be obtained in this way.
- Another object of the invention is to provide an analysis method for the state of an electrically insulating medium of an electrical energy transmission device in a suitable manner, which method makes inexpensive, simple statements about the state of the electrically insulating medium.
- the object is achieved in an analysis method of the state of an electrically insulating medium of an electrical energy transmission device in that data on the state, in particular the insulation strength of an electrically insulating fluid are received from a processing device, that the transferred data are processed and output in a chronological sequence and when at least one first limit value is reached and / or when at least one first limit value is predicted to be reached, a warning is output.
- An electrically insulating medium ensures the electrical insulation of a phase conductor.
- the insulation strength of the electrically insulating medium can be impaired.
- contamination on solid insulators or fluid insulating media can reduce their insulation strength.
- the loss of insulation media for example through leaks in containers that house a fluid insulation medium, or through abrasion on solid insulators, can lead to restrictions in terms of insulation strength. lead activity.
- Data on the condition, in particular the insulation resistance of an electrically insulating fluid z. B. represented by a density, for example, a switching device is made available by data providers. Standardization and transmission of data to a processing device can take place via the switching device.
- the processing device is supplied with the data either indirectly or directly from the switching device, so that the processing device can process the data on the state of the electrically isolating medium.
- the transferred and / or processed data can be sequenced over time. For example, it is possible to show the changes over time in the transferred or processed data and the changes over time in the transferred or processed data.
- a temporal assignment of the data can take place, for example, in a switching device from which data is transferred directly or indirectly.
- a first limit value it is possible to issue a warning when the same is reached by the transferred data or the processed data.
- a predicted reaching of the first limit value can also be determined and a warning can also be issued when the predicted data reaches the first limit value.
- a limit value is predicted to be reached, the point in time of which is far in the future, the issuing of a warning can be suppressed.
- this period can be several days, e.g. B. several 10 days, such as 90 days from the current date, are in the future.
- the transferred or processed data can be displayed consecutively in time. For example, certain status information can be displayed at certain times. so that a change over time can be recognized. For example, it is possible to display the course of the insulation strength of the electrically insulating fluid and, on the basis of the data transferred, to make a prognosis for the future of how z. B. the density of the electrically insulating fluid will change.
- a graphic representation for outputting the chronological sequence can preferably be provided. If necessary, different time periods can be displayed: z. B. predefined time periods, week, month, year or a free definition of the desired period.
- the data received and processed by the processing device can be stored locally and can also be used again.
- the data are preferably available in a computer cloud so that simplified access to them is guaranteed.
- situation-dependent maintenance can be triggered for the entire switching station.
- a further advantageous embodiment can provide that a forecast of the development of the insulation strength is below Consideration of switching operations of the electrical energy transmission device takes place.
- the electrically insulating medium can be changed in its insulating properties by switching operations of the electrical energy transmission device. If switching operations of the electrical energy transmission device are carried out accordingly, a faster aging of the electrically insulating fluid can be expected, for example. Based on the nature of the switching operations or the frequency or the intensity of the switching operations, conclusions can be drawn about changes in the electrically insulating fluids, so that the cause can be taken into account or, for example, when forecasting the achievement of limit values the switching operations expected in the future can flow into the prognosis, so that a more precise prediction of the attainment of the first limit value or the two stages of the first limit value can be made.
- the prognosis can be checked and adjusted accordingly depending on the switching operations that actually occur.
- an expected change in the insulation strength is stored within a certain period of time.
- a further advantageous embodiment can provide that a prognosis is carried out by mathematical extrapolation and / or by simulation data and / or by machine learning and / or physical models.
- a forecast of the future course z. B. the density within future time intervals can be done using mathematical extrapolation. In a simple case, this is possible in that the trend is recorded from the data already known and a forecast is extrapolated.
- At least data / measured values should preferably be available from at least 30 days, in particular 90 days, with at least one measured value per day being available.
- a simulation z. B. the density curve is made.
- physical models can also be used, which allow a more precise prediction of the density curve, taking into account the configuration of the electrical energy transmission device and the physical properties of the electrically insulating fluid used.
- Machine learning algorithms can also be used to generate forecasts.
- a neural network with memory recurrent neural network (RNN)
- LSTM cells long-short-term memory
- RNN recurrent neural network
- LSTM cells long-short-term memory
- a further advantageous embodiment can provide that data which were determined at specific interval times are used for trend analysis.
- a change in the insulation strength of an electrically insulating medium represents a long-term effect.
- the interval times can be determined, for example, in days or weeks.
- the external influences for example the time of year, can also be used in order to only take into account data that were determined at interval times that have comparable ambient conditions. For example, it is possible to only use data that are available at certain times of the day, e.g. B. occur at night or with similar loads of the Elektroenergy transmissionein direction or at the same time of year. It is thus possible to make a selection of data for the prognosis and to eliminate error sizes in a simple manner, for example by reducing the effects of climatic fluctuations from the outset.
- a further advantageous embodiment can provide that a historical data analysis is taken into account in a comparison.
- historical data analyzes can be used which, for example, are already templates for other electrical energy transmission devices of the same or similar design. For example, it is possible to evaluate certain aging phenomena, which do not always occur linearly, in an improved form and to increase the forecast quality of a trend analysis or the forecast for the future course of the insulation strength or density course. It can be provided that the historical data analysis is a data analysis which was created in the past for exactly the same electrical energy transmission device. A historical data analysis and a current data analysis can, for example, be displayed in a common graphic representation.
- Another advantageous embodiment can provide that site-specific climate information is taken into account in the analysis.
- the data that are recorded at the electrical power transmission device are preferably also provided with a location coordinate in addition to a time stamp. It is therefore possible to supplement the framework conditions or the ambient conditions at the time the data is recorded with climate information and, if necessary, to hide or lower any disturbances that are caused by the climate in the forecast. Thus, for example, fluctuations occurring at certain points can be traced back to climatic events and the output of a warning or the prognosis that a limit value will be reached can be made more precise.
- this can also be shown converted to a standardized pressure.
- a conversion to a pressure equivalent at 20 ° C is possible.
- different normalizations can be used to map or predict the state of the insulation strength of the electrically insulating fluid.
- Another object is to specify a computer program product which, when the program is executed on a data processing system, is designed to carry out a method according to the steps described above.
- a computer program product can be used to continuously monitor an electrical energy transmission device. The monitoring can take place at specific time intervals, and the computer program product can run on different computers.
- a computer cloud can be used to make computing power available in a distributed manner and to be able to carry out the analysis of the data and make a forecast quickly.
- FIG. 2 is a switching device with parallel connected NEN data suppliers that
- Figure 3 shows a switching device with data providers that are connected via a multiplexer
- FIG. 4 shows asymmetrical timing
- FIG. 5 shows symmetrical timing
- FIG. 6 shows a chronological sequence of data.
- FIG. 1 shows an electrical energy transmission device in detail. This is an electrical energy transmission device which transmits a three-phase AC voltage system by means of three phase conductors la, lb, lc.
- three phase conductors 1 a, 1 b, 1 c are shown symbolically as a single line diagram.
- Each of the three phase heads la, lb, lc is structured in the same way.
- a circuit breaker 3a, 3b, 3c is then arranged in the course of the phase conductors la, lb, lc.
- phase conductors la, lb, lc, disconnectors 2a, 2b, 2c and power switches 3a, 3b, 3c For the electrical insulation of the phase conductors la, lb, lc, disconnectors 2a, 2b, 2c and power switches 3a, 3b, 3c, the use of an electrically insulating fluid is provided.
- Each of the phase conductors la, lb, lc is assigned a fluid volume which is separated from the fluid volumes of the other phase conductors la, lb, lc. In order to make this separation, the phase conductors la, lb, lc with disconnectors 2a, 2b, 2c and circuit breakers 3a,
- the encapsulation housings 4a, 4b, 4c are essentially tubular and structurally identical, with an electrically insulating fluid being enclosed in the interior of the respective encapsulation housing 4a, 4b, 4c.
- the electrically insulating de fluid washes around the phase conductors la, lb, lc and the isolating switches 2a, 2b, 2c and the circuit breakers 3a, 3b, 3c. If necessary, the electrically insulating fluid can also act as an extinguishing gas for switching arcs that may occur.
- each of the encapsulating housings 4a, 4b, 4c can in turn be subdivided into different sections, so that in addition different insulating gas volumes separated from one another can be arranged consecutively within a phase conductor la, lb, lc.
- the aging of the electrically insulating fluid can reduce its insulation strength. Aging phenomena can be caused, for example, by arcs or partial discharges, which can occur inside the electrically insulating fluid. Furthermore, the electrically insulating fluid can also volatilize from the encapsulation housing 4a, 4b, 4c. For example, due to the aging of sealants, loss of electrically insulating fluid can occur. Such sealants are for example in the range of To provide flanges 5a, 5b, 5c in order to assemble encapsulating housings 4a, 4b, 4c from several sealed sub-elements.
- data suppliers 6a, 6b, 6c are attached to the respective encapsulating housing
- the data suppliers 6a, 6b, 6c determine data about the state of the electrically insulating fluids of the respective encapsulating housing 4a, 4b, 4.
- the data suppliers 6a, 6b, 6c can preferably be so-called density monitors, which measure the density of the electrically insulating fluids, which in the respective encapsulating housing 4a, 4b,
- a density monitor has the advantage that regardless of the external surroundings, i.e. H. in particular regardless of the temperature, an image of the insulation strength by the data suppliers 6a, 6b,
- the data suppliers 6a, 6b, 6c are analogue sensors, which output a proportionally changing electrical variable, for example an electrical current, proportional to the change in the density of the electrically insulating fluid being monitored in an encapsulating housing 4a, 4b, 4c.
- the data suppliers 6a, 6b, 6c are corresponding converters which convert a density of the electrically insulating medium proportionally into an electrical current, in particular direct current.
- the three data suppliers 6a, 6b, 6c are supplied with a variable input voltage, for example in the range from 10 to 32 V DC. This voltage supply can, for example, via the first
- a safety device 9 is in a reverse current line, d. H. in a Sammellei device in which the flows of the data suppliers 6a, 6b, 6c add to each other, arranged.
- the safety device 9 has a resistor RI and a resistor R2.
- the maximum current intensity with which the first interface 7 can be applied is normalized via the resistor RI, and overcurrents can be deflected via a second resistor R2, which is connected to ground potential.
- a flow divider is formed in a simple manner, which represents a safety device 9 for the first interface 7 of the switching device 8.
- Isolierflui de which are enclosed in an encapsulation housing 4a or encapsulation housing 4b or encapsulation housing 4c, but in the Course of the respective phase conductor la or lb or lc are divided into different sections to monitor.
- This time signal can be processed in the switching device 8 together with the data supplied by the data supplier 6a, 6b, 6c.
- Such an asymmetrically distributed clocking has the advantage that an automated or independent restart can take place even if the clock falls out of sync, since due to the asymmetry the respective clock of the first data supplier 6a can be identified due to its increased time interval .
- symmetrical clocking with regular time intervals can also take place over the sequence of the three data suppliers 6a, 6b, 6c.
- the data acquired by the switching device 8 about the state of the electrically insulating medium, in particular the insulation strength, are transferred to and received by a processing device.
- the data recorded by the data suppliers 6a, 6b, 6c can be saved e.g. B. regarding the density of the
- Data for example, to place coordinates, temperature, atmospheric pressure, time markers, etc. can be made. These possibly supplemented data are transferred directly or indirectly to the processing facility.
- the processing device can for example comprise a computer cloud or be a local computer.
- the transferred data are then processed by the processing device and output in a chronological sequence, for example in the form of a diagram in a graphic surface. A corresponding representation is made in FIG.
- the transferred data are possibly already further processed, converted and prepared for a suitable graphic representation in the processing device. Up to the point in time t1, which represents the current point in time, the previous time course of the density is mapped as an image of the insulation strength in one or in selected gas spaces. Should the data determined by the data suppliers 6a, 6b, 6c already fall below a first
- the first limit value 12 has a first stage 12a and a second stage 12b.
- the first level 12a is an alarm level at which a significant loss of density has already been determined.
- the second stage 12b represents a disturbance stage which already casts doubt on the electrical operational safety of the electrical energy transmission device.
- the analysis method also provides for a prognosis of the development of the insulation strength / density. This takes into account, for example, how often / intensely switching within an electrically insulating fluid or faults within the electrically insulating fluid have occurred in the past.
- a leakage rate is known depending on the design of the electrical energy transmission device, which causes a decrease in density and thus the insulation strength of the electrically insulating medium as the age of the electrical energy transmission rate advances .
- this variable can also be included in the prognosis of the future course of the density development of the electrically insulating medium.
- the analysis method can perform a mathematical extrapolation of the data already recorded. If necessary, simulation data can also be taken into account through the use of simulation methods in order to map the trend of changes in electrical insulation strength. Physical models are particularly suitable for this.
- machine learning algorithms i. H. Self-learning algorithms, which draw conclusions about the behavior of the current electrical energy transmission device from a large number of data that are already known, a future density profile of the monitored, electrically insulating medium can be predetermined.
- Another advantageous embodiment can provide that historical data analyzes of similar electrical energy transmission devices are used.
- non-linear processes as they can occur again and again in everyday life, can be better taken into account, so that the forecast quality for the insulation strength / the density of the electrically insulating medium can be improved again.
- the switching device 8 Since the switching device 8 is set up to provide the data it collects with a location coordinate, information about the climatic condition at the respective point in time at which the data is recorded (time marker) can also be determined in a simple manner from databases. For example, information on temperatures or lightning effects in the vicinity of the monitored electrical energy transmission device can be assigned. This makes it possible, for example, to provide data that are taken into account in the forecast with different weightings and thus improve the quality of the forecast.
- the switching device 8 can be designed as a so-called Internet-of-Things (IoT) gateway, so that, starting from the switching device 8, the data recorded there are transferred to a computer cloud (processing device). and experience processing there.
- a computer cloud can be, for example, a portable computer which has a graphical surface and thus provides a human-machine interface (HMI).
- HMI human-machine interface
- the graphical representation of the density profile already determined and the predicted density profile with corresponding forecasts for reaching the first limit value 12 with its first stage 12a and its second stage 12b can be provided, as shown in FIG. Starting from the current point in time t1, the point in time t2 for an alarm and the points in time t3 for a significant disturbance can be predetermined.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019204313.5A DE102019204313A1 (de) | 2019-03-28 | 2019-03-28 | Elektroenergieübertragungseinrichtung sowie Analyseverfahren |
| PCT/EP2020/055219 WO2020193057A1 (de) | 2019-03-28 | 2020-02-28 | Elektroenergieübertragungseinrichtung sowie analyseverfahren |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3928393A1 true EP3928393A1 (de) | 2021-12-29 |
Family
ID=69804821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20710803.6A Withdrawn EP3928393A1 (de) | 2019-03-28 | 2020-02-28 | Elektroenergieübertragungseinrichtung sowie analyseverfahren |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3928393A1 (de) |
| CN (1) | CN113812050A (de) |
| DE (1) | DE102019204313A1 (de) |
| WO (1) | WO2020193057A1 (de) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2580343B2 (ja) * | 1989-10-13 | 1997-02-12 | 株式会社日立製作所 | フィールド計器システム及びコミュニケータ |
| CN201047863Y (zh) * | 2007-05-30 | 2008-04-16 | 上海龙源智光电力技术有限公司 | 基于gps时钟信号的高压容性设备绝缘在线监测系统 |
| CN102187209B (zh) * | 2008-10-17 | 2014-07-30 | Abb研究有限公司 | 用于测量气体密度的压电传感器 |
| CN202421421U (zh) * | 2011-11-30 | 2012-09-05 | 北京光耀电力自动化有限公司 | 容性高压电力设备绝缘性能在线监测装置 |
| CN203178369U (zh) * | 2012-11-29 | 2013-09-04 | 许继集团有限公司 | 适用于智能变电站的套管监测系统 |
| CN204330957U (zh) * | 2014-11-19 | 2015-05-13 | 广东电网有限责任公司佛山供电局 | 一种变压器介电响应回复电压的测量系统 |
| JP6375928B2 (ja) * | 2014-12-17 | 2018-08-22 | 横河電機株式会社 | データ収集システム |
| JP6514598B2 (ja) * | 2015-07-28 | 2019-05-15 | 株式会社日立製作所 | ガスリーク検知装置およびガスリーク検知方法 |
| CN205280857U (zh) * | 2015-11-26 | 2016-06-01 | 国网山东省电力公司济南供电公司 | 一种电力设备绝缘泄漏电流在线监测电路 |
| EP3261200B1 (de) * | 2016-06-23 | 2020-06-10 | WIKA Alexander Wiegand SE & Co. KG | Sensorsystem für schaltanlagen |
-
2019
- 2019-03-28 DE DE102019204313.5A patent/DE102019204313A1/de not_active Withdrawn
-
2020
- 2020-02-28 CN CN202080034930.2A patent/CN113812050A/zh active Pending
- 2020-02-28 WO PCT/EP2020/055219 patent/WO2020193057A1/de not_active Ceased
- 2020-02-28 EP EP20710803.6A patent/EP3928393A1/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020193057A1 (de) | 2020-10-01 |
| CN113812050A (zh) | 2021-12-17 |
| DE102019204313A1 (de) | 2020-10-01 |
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