EP2697887A2 - Verfahren und strommesseinrichtung zur erkennung von stromentnahmen oder stromeinspeisungen in einem elektrischen niederspannungsverteilnetz - Google Patents
Verfahren und strommesseinrichtung zur erkennung von stromentnahmen oder stromeinspeisungen in einem elektrischen niederspannungsverteilnetzInfo
- Publication number
- EP2697887A2 EP2697887A2 EP11714982.3A EP11714982A EP2697887A2 EP 2697887 A2 EP2697887 A2 EP 2697887A2 EP 11714982 A EP11714982 A EP 11714982A EP 2697887 A2 EP2697887 A2 EP 2697887A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- current
- low
- active current
- active
- distribution network
- 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- Withdrawn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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
Definitions
- Method and current measuring device for detecting current draws or current feeds in an electrical low-voltage distribution network
- the invention relates to a method and a current measuring device for detecting current draws from one or power feeds in a part of a low-voltage electrical distribution network.
- the distribution system operator was dependent on it to recognize unknown feeds or feeds of electrical energy by comparing measured amounts of energy.
- the data supplied by existing electric energy meters are known via an energy consumption of known electrical loads or an energy feed electrical sources are compared to an amount of electrical energy measured at a central feed point, such as a transformer station, associated with the electrical loads or sources in question. From the comparison of these values, the distribution system operator in certain
- the invention is therefore based on the object of specifying a method and a current measuring device for detecting current draws from one or current feeds in a part of a low-voltage electrical distribution network to allow the operator of an electrical power distribution network, previously unknown power consumption or ingestions comparatively accurate to identify and place limits criz ⁇ .
- the invention is achieved by a method of the type mentioned, in which a first real current value is detected by means of a first current measuring device that indicates the current flowing at a ers ⁇ th measuring point of the low-voltage distribution network active current, and by at least one further current measuring device at least one further active current value indicating the current flowing in at least one further measuring point of the low-voltage distribution network ⁇ effective current is detected, where ⁇ at by the first and the at least one further current measurement device is a ⁇ as the load and source free adopted part of the low-voltage distribution network is demarcated.
- the first and the at least one further active current value are transmitted to a central device, which forms an active current sum from the first and the at least one further active current value by addition taking into account the respective current flow direction and either forms an extraction information which generates a current from the current indicates the first and the at least one further current measuring device delimited part of the low-voltage distribution network, or forms a feed-in information indicating a power supply to the demarcated from the first and the at least one further current measuring device part of the low-voltage distribution network, if the deviation of the active current sum of zero value exceeds specified active current threshold.
- any part of an electrical low-voltage distribution network can be set up as a closed balance chamber by being limited by corresponding current measuring devices for detecting active current values. Since the images taken by the current measuring devices active current values of a central device are fed, can be recognized by the correct sign, forming the active current sum very simple, whether held in the volume defined by the current measuring devices range of the low voltage distribution network to the operator of the low tensioning ⁇ voltage distribution network unknown current withdrawals or PowerOn ⁇ feeds.
- the central device recognizes the presence of a positive deviation of the active current sum from the value zero to ⁇ forth unknown current drain voltage distribution network from the portion of low and accordingly generates a Ent ⁇ acquisition information.
- a negative deviation however, a previously unknown power supply must be present in the part of the low-voltage network, so that the center RAL immune generates a feed-in information accordingly.
- the current flow direction were predetermined such that active currents flowing into the part would have a negative sign (and outgoing currents a positive sign), then correspondingly inverse conditions would result.
- An advantageous embodiment of the method according to the invention provides that the first and at least one white ⁇ tere active current value formed by the respective current measuring device in a time-synchronized manner the.
- a time synchronization can, for example, by receiving a timing pulse of a GPS system, an IRIG-B system or by other time synchronization of the individual current measuring devices, for example according to the Real-Time Ethernet standard or the standard for the time synchronizers ⁇ tion IEEE 1588 take place ,
- a further advantageous embodiment of the invention shown SEN method provides that the active current values over a predetermined measurement period detected time averages are used.
- the amount of data transmitted between the measuring devices and the central device can be kept comparatively low, since not every single active current value, but only temporal average values recorded over a predetermined measuring period are transmitted.
- the inventive method provides that the first and the at least one further active current value at the respective measuring point in each case relative to the same phase conductor of a multiphase Low-voltage distribution network are detected.
- the first and all phase conductors and / or with respect to the neutral conductor of a multiphase low voltage distribution network to be detected in at least one further active current value at each measuring point in each case with respect ⁇ schreib may also be provided.
- a further advantageous embodiment of the invention shown SEN procedure provides that the first current measuring device is used as a central device.
- the method can be carried out comparatively easily, since the functionality of the central device is integrated into the first current measuring device and consequently no transmission of active current values to a separate central device must take place. In addition, the costs for a separate central facility can be saved.
- the active current values are transmitted from a communication device of the respective current measuring devices via a communication medium to the central device, wherein at least one conductor of the low-voltage distribution network is used as the communication medium.
- the active current values are transmitted from a communication device of the respective current measuring devices to the central device via a communication medium, wherein a communication medium of a communication infrastructure other than the low-voltage distribution network is used as the communication medium.
- the communication infrastructure ⁇ be set up for wired or wireless data transmission.
- the detection of the active current values takes place continuously. Alternatively, however, it may also be provided that the detection of the active current values is time-controlled or initiated by a start command of the central device.
- the extraction information or the feed-in information is transmitted to a higher-level control center device and transmitted by the Control center device is output by means of a display device.
- a respective intrinsic demand active current value is detected, which indicates the respective active current from a current measuring device to cover its own power supply from the Low-voltage distribution network is added, the respective intrinsic demand active current value is transmitted to the central facility. and the central device forms the active current sum taking into account all the respective intrinsic demand active current values.
- the central processing means estimates respective Internal power active current values corresponding to the respective active current is ⁇ ben which is received from the respective current measuring devices to cover its power supply from the low voltage distribution network, and the central device the active current threshold value taking into account the Sum of all estimated self-demand active current values determined.
- a Current Sense ⁇ direction for detecting current withdrawals from one or electricity feed-in part of a low voltage electrical distribution network with a measuring unit for He replaced ⁇ of active current measured values at a measuring point of the low voltage distribution network, and a communication unit for transmitting the real current measurement values at a central facility.
- the current-measuring device is set up to carry out a method according to one of claims 1 to 13.
- the above object is achieved by a system for detecting current draws or power feeds in a part of a low-voltage electrical distribution network, in which at least two such current measuring devices are vorgese ⁇ hen.
- Fig. 1 is a schematic view of one of three
- Fig. 2 is a schematic view of one of three
- FIG. 1 shows an exemplary embodiment of a system for the automatic detection of a current consumption from or a current feed into a part 10 of a three-phase low-voltage distribution network, which is not further illustrated.
- the low-voltage distribution network has three phase conductors LI, L2, L3 and a neutral conductor N. Alternatively, others can
- Network types may be provided, e.g. a three-phase version without a common neutral conductor.
- FIG. 1 shows a first current measuring device IIa, which is arranged at a first measuring point 12a in the low-voltage distribution network.
- a second Current Sense ⁇ IIb direction and a third current measurement means 11c are provided which are arranged at measuring points 12b and 12c.
- the measuring points 12a, 12b and 12c delimit the part 10 of the low-voltage distribution network in such a way that no known current sources and current loads are present therein.
- Each current measuring device IIa, IIb, 11c comprises a measuring unit 13a, 13b, 13c, which is set up to detect effective current values corresponding to those at the respective measuring point 12a,
- Indicate 12b, 12c in the individual phase conductors LI, L2, L3 flowing active currents Concretely, records the measuring unit 13a of the first current measuring device IIa flowing at the measurement point 12a in the individual phase conductors LI, L2, L3 actual currents I A, I / I a, 2 / I a, 3 / the measurement unit 13b of the second Current Sense ⁇ direction IIb at the measuring point 12b in the individual phase conductors LI, L2, L3 flowing active currents ⁇ b , i, I b , 2 / I, 3 and the measuring unit 13c of the third current measuring device 11c at the measuring point 12c in the individual phase conductors LI, L2, L3 flowing active currents I c , ir ⁇ , 2r I c, 3 -
- the active currents are drawn in the embodiment of Figure 1 so that flowing into the part 10 in active currents a positive Have sign, while from this flowing active currents have a negative sign.
- the detection of the active currents preferably takes place in a temporally synchronized manner.
- the current measuring devices IIa may, IIb, 11c as internal timer (not shown in Figure 1) which, for example, via a exter ⁇ NEN timing (for example, from a GPS signal) or via another Zeitsynchronisier processor (eg via Zeitsynchronisier- telegrams IEEE 1588) are synchronized.
- the measurement ⁇ units are coupled with the internal timers that they can attach the active current values detected a respective time stamp indicating the respective time of measurement.
- the current measuring devices IIa, IIb, 11c each comprise a communication unit 14a, 14b, 14c, which are set up for transmitting the active current values detected by the respective measuring unit 13a, 13b, 13c to a central device 15, which in the exemplary embodiment according to FIG IIa is integrated.
- the communication units 14a, 14b, 14c are connected, on the one hand, to the respective measuring units 13a, 13b, 13c and, on the other hand, to coupling units only schematically indicated in FIG.
- the central device 15 provided in the first current measuring device IIa is set up to calculate an effective current sum from the respective received active current values of the individual current measuring devices IIa, IIb, 11c by addition taking into account the direction of current flow.
- the central device 15 is supplied on the one hand the effective current value determined by the measuring unit 13a of the first current measuring device IIa directly, while the obligations of the measuring ⁇ units 13b and 13c of the two further Strommesseinrich- IIb, 11c active current values detected over the communica ⁇ tion units 14b, 14c in the phase conductors LI, L2, L3 and / or the neutral conductor N coupled and transmitted to the communica tion ⁇ unit 14a of the first current measuring device IIa. From this communication unit 14a, the received active current values are transferred to the central device 15.
- the central device 15 determines by sign-correct addition of an effective current sum from the received active current values of the respective current measuring devices IIa, IIb, 11c.
- the active current measured values of a matching phase conductor LI, L2, L3 are used.
- manual settings can be made in the current measuring devices IIa, IIb, 11c, which specify a fixed assignment of the detected active current measured values to the respective phase conductors.
- the respective phase conductor LI, L2, L3 can also be detected independently and ne corresponding information in the device settings are adopted.
- the part 10 of the low-voltage distribution network is actually - as assumed - free of further electrical loads and sources, then for each of the active current sums Sn, S12, S13 ideally a value of zero must result, since as much active current flows into the part 10, such as flowing out of this again. Under real conditions (eg taking into account measurement inaccuracies), this results in a value which is close to zero. Therefore, the Moneinrich ⁇ tung 15 checks each of these active current sums S, S12, S13, whether their depending ⁇ stays awhile deviation from the zero value - positive or negative direction - exceeds a predetermined active current threshold value, and generates, if necessary, at too high a positive deviate ⁇ monitoring information or in case of excessive negative deviation feed-in information. If the current flow direction were set exactly the opposite, then correspondingly reverse conditions would result at these points.
- Active current values are recorded and transmitted.
- the detection of the active current values can be carried out continuously, for example. Alternatively, the detection can also be performed time-controlled (eg at the beginning of each full hour) or triggered by a start command of the central device 15.
- the central device 15 transmits, for example, to all measuring units 13a, 13b, 13c entwe ⁇ the right (to the measuring unit 13a) or via the communi ⁇ tion units 14a, 14b, 14c (at the measuring units 13b, 13c) a start command to start a Indicates the measurement with regard to the start of the measurement and its duration. If the active current summation is to be performed using the time average, at the end are of the measurement in the measuring units 13a, 13b, 13c, time averages of the amounts of Wirkströ ⁇ me in the phase conductors LI, L2, formed L3.
- the measuring method described can be configured even more precisely if, in addition to the active currents flowing at the measuring points 12a, 12b, 12c, the active currents required by the current measuring devices IIa, IIb, 11c to cover their respective own power supply (eg for communication functions, measuring functions) be taken into account.
- these active currents can either be measured concretely for each current measuring device IIa, IIb, 11c and transmitted to the central device 15 in the form of respective intrinsic demand active current values which correspondingly include the intrinsic active current values in the formation of the active current sum (the current measuring devices refer to FIG Part 10 here active current, so that the self-demand active current values according to the above convention for current flow direction with a negative sign must be considered).
- the self-demand active current values of the Primaein ⁇ direction 15 can also be estimated and received as an additional correction factor in the active current threshold, the Value to take account of the own power requirement thus would have to be increased slightly.
- FIG. 2 shows a second exemplary embodiment of a part 20 of a low-voltage distribution network.
- the operation of the system shown in the second embodiment corresponds in most features of the already explained for the first embodiment mode of operation, corresponding components are ⁇ therefore marked with matching reference numerals.
- the part 20 of the low-voltage distribution network in the secondssensbei ⁇ game on a distribution network operators previously unknown branch 21, which is connected to an electrical load or source the current from the part 20 refers or feeds into the ⁇ sen, without that an electric energy meter is provided for this purpose. Consequently, there are active currents Ia, Ir ⁇ d , 2r I ci, 3, which are not detected by any of the current measuring devices IIa, IIb, 11c. Accordingly, the assumption made in the installation of the current measuring devices IIa, IIb, 11c that part 20 of the low-voltage distribution network is not a load-free and swell-free part does not apply.
- the presence of the branch 21 can not only be clearly recognized via the method already described in detail with reference to FIG. 1, but can also be located insofar as the branch 21 must lie within the monitored part 20.
- the active current summation in the Primaeinrich- tung 15 resulting from zero significantly different values, so that detected a removal or a feeding active power via the branch 21 and accordingly a Ent ⁇ acceptance information or a Einspeiseinformation is generated.
- This is transmitted, preferably also via the PLC communication connection, to a higher-level control center, where it is displayed to the operator of the distribution network, so that the latter can undertake further measures for determining the branch 21, which has not previously been known to him.
- the central device 15 can also be designed as an independent device, which is connected to the current-measuring devices IIa, IIb, 11c via a communication connection.
- the transfer of all active current values may also take place a multi-stage transmission of the active current values to the central device 15, in which an active current value is first transmitted to another Current Sense ⁇ direction and already there to form ei ⁇ ner active current subtotal to the added by this current measuring device active current value is added. Thereafter, this active current subtotal is either transmitted directly to the central ⁇ device or initially fed to another current measuring device to form a further active current subtotal. In this way, after one or more intermediate stages in the central device 15, finally, the active current sum taking into account all active current values or active current intermediate sums active current can be formed.
- a current measuring device and / or a central device can be realized quality measuring device as a part of functionality of an electric energy meter, a voltage, a data concentrator or a Au ⁇ tomatleitersauss. Consequently, with the described method an automatic recognition of drawing-off power from a power feeds or can be carried out in part of a low voltage distribution network with very high sensitivity and for each Netzlei ⁇ processing. This can be achieved, for example, by synchronous detection of associated active currents flowing into and out of a part of the distribution network and the formation of a corresponding summation balance. By using the active currents, voltage drops along the power lines or the associated network losses are negligible. By using the current measuring devices, it is possible to scale the monitored parts of the low-voltage distribution network in their size almost arbitrarily or to monitor only certain localized parts of the distribution network.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2011/056014 WO2012139655A2 (de) | 2011-04-15 | 2011-04-15 | Verfahren und strommesseinrichtung zur erkennung von stromentnahmen oder stromeinspeisungen in einem elektrischen niederspannungsverteilnetz |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2697887A2 true EP2697887A2 (de) | 2014-02-19 |
Family
ID=44625891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11714982.3A Withdrawn EP2697887A2 (de) | 2011-04-15 | 2011-04-15 | Verfahren und strommesseinrichtung zur erkennung von stromentnahmen oder stromeinspeisungen in einem elektrischen niederspannungsverteilnetz |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2697887A2 (de) |
WO (1) | WO2012139655A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013186404A1 (es) * | 2012-06-15 | 2013-12-19 | Ariadna Instruments, S.L. | Método y dispositivo de identificación de conectividad en redes eléctricas |
CN103532235A (zh) * | 2013-10-18 | 2014-01-22 | 广州南方电力集团科技发展有限公司 | 一种基于ColdFire架构的配电终端 |
EP2874265B1 (de) * | 2013-11-13 | 2017-07-19 | Siemens Aktiengesellschaft | Verfahren und System zum Überwachen und Steuern einer Stromverteilung in einem Energieverteilungsnetz |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10231306A1 (de) * | 2002-07-10 | 2004-01-29 | Siemens Metering Ag | Ferrariszähler mit einer Schaltungsanordnung zum Schutz gegen fehlerhafte oder manipulierte Beschaltung |
US8159210B2 (en) * | 2008-07-11 | 2012-04-17 | Kinects Solutions, Inc. | System for automatically detecting power system configuration |
AT508192B1 (de) * | 2009-05-07 | 2011-01-15 | Moeller Gebaeudeautomation Gmbh | Überwachungsvorrichtung |
-
2011
- 2011-04-15 EP EP11714982.3A patent/EP2697887A2/de not_active Withdrawn
- 2011-04-15 WO PCT/EP2011/056014 patent/WO2012139655A2/de active Application Filing
Non-Patent Citations (1)
Title |
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See references of WO2012139655A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2012139655A2 (de) | 2012-10-18 |
WO2012139655A3 (de) | 2013-01-03 |
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