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WO2004084393A1 - Dispositif et procede d'alimentation en courant d'appareils d'excitation - Google Patents

Dispositif et procede d'alimentation en courant d'appareils d'excitation Download PDF

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Publication number
WO2004084393A1
WO2004084393A1 PCT/EP2003/004014 EP0304014W WO2004084393A1 WO 2004084393 A1 WO2004084393 A1 WO 2004084393A1 EP 0304014 W EP0304014 W EP 0304014W WO 2004084393 A1 WO2004084393 A1 WO 2004084393A1
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WO
WIPO (PCT)
Prior art keywords
current transformer
current
voltage
module
field device
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.)
Ceased
Application number
PCT/EP2003/004014
Other languages
German (de)
English (en)
Other versions
WO2004084393A8 (fr
Inventor
Guntram Scheible
Jochen Mast
Thomas Keul
Dietmar Overhoff
Heinrich Deckmann
Ralf Huck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Research Ltd Switzerland
Original Assignee
ABB Research Ltd Switzerland
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ABB Research Ltd Switzerland filed Critical ABB Research Ltd Switzerland
Priority to AU2003227640A priority Critical patent/AU2003227640A1/en
Priority to PCT/EP2003/004014 priority patent/WO2004084393A1/fr
Publication of WO2004084393A1 publication Critical patent/WO2004084393A1/fr
Publication of WO2004084393A8 publication Critical patent/WO2004084393A8/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from AC or DC

Definitions

  • the invention relates to a device for the power supply of a field device in a process engineering system according to the preamble of claim 1, a field device for use in a process engineering system and a method for power supply to a field device according to the preamble of claim 11.
  • Field devices are used in process engineering systems to measure process variables such as pressure, temperature, level, flow, composition and to transmit the measured values to a central control center, if necessary after preprocessing the recorded data in the field device itself, such as filtering or limit value monitoring.
  • Other types of field devices are used as actuators, which usually include at least one electric drive for this purpose.
  • field devices generally have at least one measuring or actuating module for the actual measurement and conversion of the physical or chemical process variable to be measured into electrical signals or for executing the actuating action, furthermore at least one control, data acquisition and processing unit for controlling the internal processes in the Field device and for recording and, if necessary, preprocessing the electrical signals, as well as a communication device for transmitting the recorded and possibly preprocessed signals to a central control center, but also for receiving signals from the control center, for example configuration data, calibration data or setpoints.
  • the transmission of the Signals from the communication device to the central control center and back can be implemented in a wired or wireless manner. In the latter case, one speaks of a wireless communication device, for example a Bluetooth or a radio frequency connection.
  • Field devices in process engineering processes are almost exclusively active today, so they require electrical auxiliary energy.
  • the electronic assemblies and components integrated in the interior of the field device generally require a low DC voltage, for example 5V DC or 9V DC, in order to work as intended. In particular, this applies to field devices that have a low overall power consumption, for example a few mW.
  • the electrical energy is supplied to the field device in process engineering systems today according to the state of the art from the outside by branching off from the partial voltage system or systems used to supply power to the process engineering system, or, as in the case of 2-wire technology, via a common signal line with looped in.
  • the most common partial voltage systems in process engineering systems include 10KVAC, 220 / 400V AC / DC, 690V AC, 110V AC / DC, or 24/12 / 6V DC.
  • the object is achieved with respect to the device by the characterizing features of claim 1, with regard to the field device by the features of claim 11, and with respect to the method by the characterizing features of claim 12.
  • the current transformer thus comprises at least two networked partial area current transformer assemblies formed from at least one current transformer means and a switching means, and a control unit for controlling the switching means in the partial area current transformer modules, so that the current path between the input and output interface can be switched in such a way that the Adaptation of the respective partial voltage system to the conversion range suitable for the device voltage arises.
  • the universal current transformer contains a number of networked partial current transformers in, wherein different paths between the input and output interface can be set in the network by cascading the partial current transformers in series.
  • the switching means means that the voltage or the current is switched through or passed through between their partial current transformer inputs and outputs, which in effect corresponds to bridging the corresponding partial current transformer.
  • the control unit controls the activation of the respective switching means and thus the establishment of the network path.
  • the current transformer comprises a series connection of at least two sub-region current transformer assemblies comprising at least one current transformer means and at least one switching means.
  • a series scarf tion is a very simple and clear way of networking, and it considerably simplifies the internal structure of the universal current transformer.
  • the current transformer means and the switching means are separate assemblies.
  • the switching means could, for example, be electronic or electromechanical switches, and the current transformer means could be current transformer assemblies known from electronics.
  • a further advantageous embodiment of the invention is characterized in that the current transformer means and switching means are integrated in a current transformer / switching module. This further reduces the number of modules to be installed in the universal current transformer and ensures a compact, cost-effective construction.
  • the control unit comprises a partial voltage detection module.
  • This partial voltage detection module automatically detects which partial voltage system the current transformer is connected to. The partial voltage detection module can then initiate the appropriate switching of the switching means within the control unit.
  • a further advantageous embodiment of the invention provides that the current transformer on the output side comprises a storage module for storing electrical energy. If the power supply to the current transformer is interrupted, the field device can thus be supplied with power by the memory module and in this way a continuous operation of the field device can be ensured even with a discontinuous external power supply.
  • the current transformer comprises a charge state monitoring module, which is connected to the control data acquisition and. Processing module of the field device and / or the communication device is connected.
  • the state of charge of the memory module can be monitored at least for falling below a minimum value and / or reaching a normal value, and information about the state of charge can be transmitted via the communication device to a control center located outside the field device. If the storage module in the control center falls below a minimum charge level an alarm signal and / or a measure for recharging the energy store can then be triggered by the control center.
  • connection means is a terminal or an inductive coupling element or a capacitive coupling element. This ensures that the device can be connected to different power supply lines of different partial voltage systems present in the process plant.
  • the communication interface can be a wireless communication interface, for example a Bluetooth interface or a radio frequency interface.
  • a field device according to the invention for use in a process plant in which at least one electrical power supply line is present is characterized in that the field device comprises a current transformer as described above.
  • the invention consists in that a universal current transformer is used as described above, the current path between the input and output interface being switched in such a way that it is suitable for adapting the respective partial voltage system to the device voltage Conversion area arises.
  • the partial voltage system present at the input-side connection point is recognized in the control unit of the current transformer, and the switching means are respectively controlled by the control unit in such a way that suitable current transformer means are switched between the input and output interfaces by switching through or bypassing and connecting series connections that are not required a conversion region suitable for adapting the detected partial voltage system to the device voltage is formed.
  • Electrical energy can be temporarily stored in the storage module and thus when the power supply is interrupted to the input-side connection point of the university.
  • the field device can be supplied with power by the storage module.
  • a particularly advantageous variant of the method is characterized in that the state of charge of the memory module is monitored with a state of charge of the charge state at least for falling below a minimum value and / or reaching a normal value and information about the state of charge via the communication device of a control center located outside the field device is transmitted.
  • an alarm signal and / or a measure for recharging the energy store can be triggered if the storage module in the control center falls below a minimum charge level.
  • the current transformer is connected via the connecting line and the connecting means to the power supply line of an electrical device operated discontinuously in the process engineering system, and the power supply from the control center is closed when the storage module falls below a minimum charge level the discontinuously operated electrical device is switched on until the state of charge of the memory module has returned to its normal value.
  • the power supply cable of a lamp that is currently switched off can be used to supply the field device. If it is detected that the minimum charge level of the memory module has been undershot, the control center can then switch on the lamp until the memory module is charged again.
  • Fig. 1 is a schematic representation of a first variant of a first Embodiment of the invention
  • FIG. 3 shows a schematic illustration of a second embodiment of the invention, in which the current transformer is integrated in the field device,
  • Fig. 4 is a schematic representation of a current converter circuit for use in the current converter
  • Fig. 5 is a schematic representation of a further current converter circuit for
  • FIG. 1 schematically shows a field device 10 for use in a process engineering process, which is connected to a power supply device 20 via a field device connection point 11 and a low-voltage cable 50.
  • the field device comprises a measuring or adjusting module 12, a control, data acquisition and processing unit 14 and a communication device 15 which. arranged within a housing and connected together.
  • the communication device 15 is designed as a wireless communication device and is connected, for example via a radio frequency transmitter, to a central control center, not shown here, located outside the field device.
  • the wireless data transmission between the field device 10 and the control center is symbolized by the double arrow 15a.
  • the field device 10 requires an electrical supply voltage of 3.3 VDC for its intended function.
  • the power supply device 20 comprises a current converter 20a with an output-side connection point 38, via which the connection to the low-voltage cable 50 is established, an input-side connection point 21, to which a connection conductor arrangement designed as a connection cable 4 is connected at one end, the other End of the connecting cable 4 is connected via a connecting means 3 to a current conductor arrangement of the process engineering process, which is designed as a power cable 1.
  • the power cable 1 is here, for example, a cable that to the in belongs to the process engineering process used partial voltage system 220 / 400V AC.
  • a network control module 22 is arranged in the current converter 20a in direct connection with the connection point 21 on the input side. This includes a partial voltage detection module 22a, which detects the type of current present at the connection point 21 on the input side.
  • a network consisting of four sub-area current transformers 26 ', 28', 30 ', 32' is arranged in the current transformer 20a in the network nodes.
  • the sub-area current transformers each comprise a current transformer means and a switching means, here, for example, a current transformer means and a switching means according to FIG. 4 or FIG. 5 are each integrated in a current transformer / switching module.
  • the current transformer 20a comprises a total of 12 switching elements in the network mesh, of which only the switching elements 27 ', 29', 31 ', 33' are provided with reference numerals for the sake of clarity. are.
  • the switching elements are controllable switches with which the network mesh can be interrupted or switched through.
  • the network control module 22 which is indicated in FIG. 1 by the dashed lines of action between the switching elements or partial current transformers and the network control module 22.
  • the meshes of the network all originate in a network start node K2 immediately downstream of the input-side connection point 21 and end in a network end node K1 upstream of the output-side connection point 38.
  • the partial range current transformer 26 ' is designed for the current conversion of a partial range current transformer input voltage Ue (see FIG. 4, FIG. 5) from 10KV AC to a partial range current transformer output voltage Ua (see FIG. 4, FIG. 5) of 690 V AC / DC. placed, the partial current transformer 28 'for the current conversion from 690V AC / DC to 220 / 400V AC or DC, the partial current transformer 30' for the conversion from 220/400 VAC / DC to 24/12/6 VDC, the partial current transformer 32 'for the Current conversion from 24/12 / 6V DC to 3.3 VDC.
  • the partial voltage detection module 22a within the network control unit 22 detects that the power line 1 carries a voltage of 220 VAC.
  • a program contained in the network control unit 22 determines the partial area current transformers 30 ' and 32 'as suitable for switching the line voltage from 220VAC in series to the device voltage of 3.3VDC.
  • conversion is first carried out from 220/400 VAC / DC to 24/12/6 VDC and in the subsequent partial-range current transformer 32' from 24/12 / 6V DC to 3.3 VDC.
  • the network control unit 22 also determines which of the switching elements must be switched on and which must be switched off in order to switch the suitable path from the input-side connection point 21 to the output-side connection point 38 in such a way that the sub-area current transformers 30 ′ and 32 ′ are in the correct order be run through in succession. It also determines that the switching means in the sub-area current transformers 26 'and 28' must be switched through. The path drawn in bold in FIG. 1 is established from the input-side connection point 21 via the switched-on switching element 27 ', the sub-area current transformer 30', the switched-on switching element 30 ', the sub-area current converter 32' and the switched-on switching element 31 'to the output-side connection point 38. The other switching elements are switched off.
  • the partial voltage detection module 22a detects within the Network control unit 22 that 10 kV AC is now present, and accordingly causes the path in the current transformer 20 a from the input-side connection point 21 to the output-side connection point 38 via the sub-range current transformers 26 '(10KV AC to 690V AC / DC), 28' ( 690V AC / DC to 220 / 400V AC / DC), 30 '(220/400 VAC / DC to 24/12/6 VDC) and 32' (24/12 / 6V DC to 3.3 VDC) switched in this order becomes.
  • the function is corresponding when connecting to other partial voltage systems.
  • a memory module 36 is arranged between the output-side node K1 of the output-side connection point 38. This is charged with electrical energy by the current converted at the end of the network in the network node K1.
  • the memory module 36 can be an accumulator, a double-layer capacitor or else a regenerative fuel cell.
  • the memory module 36 takes over the power supply of the field device 10 in cases in which the power supply to the current transformer 20a is interrupted or has been suspended.
  • a current sensor 41 is provided, which measures the current converted at the end of the network in the network node K1 and forwards this information to a memory control unit 42 which, if necessary, causes the power supply to the field device 10 by the memory module 36.
  • the memory module 36 is connected to a state of charge monitoring module 40, in which the respective state of charge of the memory module 36 is determined and information about the communication device 15 connected to the state of charge monitoring device is communicated to the control center.
  • the power cable 1 can be the power supply cable of an electrical device operated discontinuously in the process engineering system, for example a lighting device, a valve, an actuator, etc. If the state of charge monitoring module 40 detects in this case that the storage module 36 has fallen below a minimum state of charge, then this information is communicated to the control center via the communication interface 15. This will then cause the power supply to the discontinuously operated electrical device to be switched on until the state of charge of the memory module has returned to its normal value. It is not necessary that the discontinuously operated device is actually switched on; only the power supply to this device is activated.
  • an electrical device operated discontinuously in the process engineering system for example a lighting device, a valve, an actuator, etc.
  • Figure 2 shows a variant of the first embodiment of the subject matter of the invention.
  • the network of the current transformer 20a consisting of the partial current transformer assemblies and switching elements is designed such that four partial current transformer assemblies 26, 28, 30, 32 are connected in series.
  • Each sub-area current transformer assembly 26, 28, 30, 32 comprises a current converter means 26a, 28a, 30a, 32a and a switching means 27, 29, 31, 33.
  • Current converter means and switching means are designed as separate modules.
  • the conversion ranges of the individual sub-area current transformer modules 26 (10KV AC to 690V AC / DC), 28 (690V AC / DC to 220 / 400V AC / DC), 30 (220/400 VAC / DC to 24/12/6 VDC) and 32 (24/12 / 6V DC to 3.3 VDC) are the same as described in Fig. 1 above. All other construction elements and functional groups correspond to those of FIG. 1 and are provided with identical reference numerals in FIGS. 1 and 2.
  • the power cable 1 is here again a cable, the partial voltage system used to that in the technical process' 220 / 400VAC belongs and the field device 10 requires 3 VDC as a power supply voltage. Then the control unit 22 switches on the switching means 27 and 29, so that the partial current transformers 26 and 28 are bridged and only the two partial current transformers 30 and 32 are connected in series, the voltage of the power cable from 220 VAC to 24/12 / 6V DC to 3.3 VDC convert.
  • control unit 22 switches all four
  • Switching means 27, 29, 31, 33 so that the current path in the current transformer 20a from the input-side connection point 21 to the output-side connection point 38 via the sub-region current transformer assemblies 26 (10KV AC to 690V AC / DC), 28 (690V AC / DC to 220 / 400V AC or DC), 30 (220/400 VAC / DC to 24/12/6 VDC) and 32 (24/12 / 6V DC to 3.3 VDC).
  • the current converter means 26a, 28a, 30a, 32a and the switching means 27, 29, 31, 33 can be built together on a circuit board.
  • the subassembly can be a circuit board or an integrated circuit.
  • the switching function of a switching device can also be carried out by operating a current transformer device in a 1: 1 mode, so it does not necessarily have to be a separate functional module. 4 shows an example of this.
  • FIG. 4 shows a step-down converter known per se, which is used here as a sub-area current transformer assembly, for example as assembly 26, 28, 30 or 32 in FIG. 2.
  • Ue is the partial current transformer input voltage
  • Ua is the partial range current transformer output voltage.
  • Ce, Ca, D, S and L denote the components usually used in electronics with step-down converters of this type, namely Ce and Ca capacitors, L an inductor, D a diode, S a switch, preferably an electronic switch.
  • the ratio of Ua to Ue is determined by the duty cycle of the electronic switch S.
  • the pulse duty factor of the electronic switch S ie the ratio of the switch-on time to the switch-off time of the switch S in a periodic switching operation in which the period is equal to the sum of the switch-on and switch-off time, is 1, Ue becomes 1: 1 on Ua switched through, so there is then no voltage conversion. If the switching ratio is less than 1, Ue is converted down to Ua in a ratio corresponding to the switching ratio.
  • the switching means is thus an integral part of the current transformer function of the sub-region current transformer module.
  • FIG. 5 32 in Fig. 1 A further example in which the switching means is an integral part of the current transformer function of the partial current transformer module is shown in FIG. 5 32 in Fig. 1 is used.
  • Ue is again the partial current transformer input voltage
  • Ua is the partial current transformer output voltage.
  • the ratio of Ua to Ue is again determined by the pulse duty factor of the electronic switch S, whereby in the case of the isolating buck converter, in contrast to the coupled buck converter according to FIG. 4, Ua can in principle also become larger than Ue.
  • FIG. It shows a field device 10a for use in a process engineering process, which comprises a measuring or adjusting module 12, a control, data acquisition and processing module 14 and a communication device 15.
  • the field device 10a likewise comprises a current transformer 20a, which is therefore an integral part of the field device 10a here.
  • a NEN as a connection cable 4
  • the field device 10a with an integrated current transformer is connected to the current conductor 1, which is designed as a current cable, of the process engineering process.
  • the same components and components, in particular the current transformer 20a, with their reference numerals and the function of the power supply via the integrated current transformer 20a correspond to those described in FIG. 2 and have the same reference numerals.
  • the current sensor 41 in the embodiments according to FIGS. 1, 2, 3 may also already be an integral part of each current transformer means 26a, 28a, 30a, 32a or each partial area current transformer assembly 26, 28, 30, 32; in this case, i.e. If at least one of the sub-area current transformer modules already comprises a current sensor, this should be used for monitoring for an interruption in the external power supply, whereupon the separate current sensor 41 at the end of the network node K1 could then be omitted.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

L'invention concerne un dispositif (20) qui est destiné à l'alimentation en courant d'un appareil d'excitation (10) comprenant au moins un module de mesure (12), un module de commande, de saisie et de traitement de données (14) et un dispositif de communication (15), et qui est situé dans une installation technique, ce dispositif (20) fournissant la tension nécessaire au fonctionnement de l'appareil d'excitation. L'installation technique comporte au moins un câble d'alimentation électrique (1) qui est raccordé à une tension d'installation appartenant aux systèmes de tension partielle usuels dans les installations techniques. Le dispositif (20) comprend un transformateur de courant qui présente au moins un point de raccordement (21) du côté entrée et un point de raccordement (38) du côté sortie ainsi qu'une plage de conversion appropriée permettant d'adapter le système tension partielle respectif à la tension de l'appareil en plus d'un câble de raccordement (4) et d'un moyen de raccordement (3) à attacher au(x) câble(s) d'alimentation (1). Le transformateur de courant comprend (20a) un réseau constitué de transformateurs de courant partiels (26, 28, 30, 32, 26', 28', 30', 32') dans les noeuds de réseau et au moins un élément de commutation (27, 29, 31, 33, 27', 29', 31', 33') dans au moins un réseau maillé. Le transformateur de courant comprend également une unité de commande (22) destinée à la commande des éléments de commutation (27, 29, 31, 33, 27', 29', 31', M), ce qui permet l'établissement d'une voie de courant entre l'interface d'entrée et l'interface de sortie (21, 38) par le montage successif d'un nombre correspondant de transformateurs de courant partiel (26, 28, 30, 32, 26', 28', 30', 32') de manière à générer la plage de conversion appropriée pour adapter le système de tension partiel respectif à la tension de l'appareil.
PCT/EP2003/004014 2003-04-17 2003-04-17 Dispositif et procede d'alimentation en courant d'appareils d'excitation Ceased WO2004084393A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003227640A AU2003227640A1 (en) 2003-04-17 2003-04-17 Device and method for supplying power to field devices
PCT/EP2003/004014 WO2004084393A1 (fr) 2003-04-17 2003-04-17 Dispositif et procede d'alimentation en courant d'appareils d'excitation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2003/004014 WO2004084393A1 (fr) 2003-04-17 2003-04-17 Dispositif et procede d'alimentation en courant d'appareils d'excitation

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WO2004084393A8 WO2004084393A8 (fr) 2005-08-18

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0409226A2 (fr) * 1989-07-21 1991-01-23 Hitachi, Ltd. Système de commande de source d'alimentation
US5901057A (en) * 1992-06-10 1999-05-04 Digital Equipment Corporation Uninterruptible power supply with fault tolerance in a high voltage environment
WO1999035733A2 (fr) * 1998-01-08 1999-07-15 Abb Daimler-Benz Transportation (Technology) Gmbh Procedes pour etablir des instructions de reglage pour redresseurs
DE19930678A1 (de) * 1999-03-26 2000-11-02 Elektra Beckum Ag Elektronische Leistungsstelleinrichtung, insbesondere als Schweißenergiequelle
EP1248343A2 (fr) * 2001-04-06 2002-10-09 Eni Technologies, Inc. Architecture modulaire pour système industriel d'alimentation de puissance

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0409226A2 (fr) * 1989-07-21 1991-01-23 Hitachi, Ltd. Système de commande de source d'alimentation
US5901057A (en) * 1992-06-10 1999-05-04 Digital Equipment Corporation Uninterruptible power supply with fault tolerance in a high voltage environment
WO1999035733A2 (fr) * 1998-01-08 1999-07-15 Abb Daimler-Benz Transportation (Technology) Gmbh Procedes pour etablir des instructions de reglage pour redresseurs
DE19930678A1 (de) * 1999-03-26 2000-11-02 Elektra Beckum Ag Elektronische Leistungsstelleinrichtung, insbesondere als Schweißenergiequelle
EP1248343A2 (fr) * 2001-04-06 2002-10-09 Eni Technologies, Inc. Architecture modulaire pour système industriel d'alimentation de puissance

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AU2003227640A1 (en) 2004-10-11
WO2004084393A8 (fr) 2005-08-18

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Free format text: IN PCT GAZETTE 40/2004 UNDER (22) REPLACE "17MARCH 2003 (17.03.2003)" BY "17 APRIL 2003 (17.04.2003)"

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