EP0569815B1 - Evaluation system for an electrofilter - Google Patents

Evaluation system for an electrofilter Download PDF

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Publication number
EP0569815B1
EP0569815B1 EP19930107164 EP93107164A EP0569815B1 EP 0569815 B1 EP0569815 B1 EP 0569815B1 EP 19930107164 EP19930107164 EP 19930107164 EP 93107164 A EP93107164 A EP 93107164A EP 0569815 B1 EP0569815 B1 EP 0569815B1
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EP
European Patent Office
Prior art keywords
lines
power supply
transformer
voltage
conversion device
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Expired - Lifetime
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EP19930107164
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German (de)
French (fr)
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EP0569815A1 (en
Inventor
Norbert Dipl.-Ing. Grass
Gerhard Dipl.-Ing. Dönig
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Siemens AG
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Siemens AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/66—Applications of electricity supply techniques
    • B03C3/68—Control systems therefor

Definitions

  • the invention relates to an arrangement for data acquisition and transmission in an electrostatic filter which is supplied with electrical energy via a high-voltage transformer.
  • the plugs can consist, for example, of a Schuko plug for the energy supply and a Sub-D plug or a BNC plug for the data line.
  • a common connector is used, which can be plugged in only in one position, for example due to its symmetry properties.
  • the data lines and the power supply lines are designed to be non-interchangeable, the lines cannot be confused with one another even without a plug.
  • the data lines can be designed, for example, as a ribbon cable or as a coaxial cable, while a conventional copper cable is used for the energy supply.
  • optical fibers can also be used as data lines. It has turned out that, contrary to the expectations of experts, optical fibers can withstand the mechanical loads in rough industrial operation if they are coated accordingly. If the data lines are designed as optical fibers, there is galvanic decoupling and thus potential isolation between the control cabinet and the transformer cabinet. As a result, it cannot happen that the measured value detection device is destroyed by a potential jump, such as occurs, for example, in the event of a filter breakdown. This results in higher operational reliability.
  • the data lines and the power supply lines are preferably routed in a common cable.
  • the mechanical load on the optical fibers is significantly reduced. This ensures that the data lines are not interrupted abruptly.
  • Additional lines e.g. to monitor the transformer temperature.
  • the high-voltage transformer is arranged in the transformer cabinet 1.
  • the secondary winding 2 of the high-voltage transformer is shown in FIG.
  • the output voltage of the secondary winding 2 is applied to the electrostatic filter (not shown) via the rectifier unit 4.
  • An output of the rectifier unit 4 is connected to earth via the series resistor 3.
  • the other output of the rectifier unit 4 is also connected to earth via the shunts 5, 6.
  • the signals tapped via lines 7, 8 are proportional to the filter current and the filter voltage.
  • the lines 7, 8 are fed to the conversion device 9.
  • the conversion device 9 internally has a voltage-controlled oscillator (VCO) which converts the small analog signals fed into frequency signals. These frequency signals are then used to drive two light-emitting diodes (not shown). The light signals are fed into the optical fibers 10, which are guided in the cable 11 to the control cabinet 12.
  • VCO voltage-controlled oscillator
  • a computing unit 13 is arranged in the control cabinet 12.
  • the computing unit 13 has, inter alia, a demodulator 14, which receives the light signals of the lines 10 and converts them into digital signals.
  • the digital values for filter current and filter voltage thus available in the computer 13 can then be processed further in the computer 13, for example for controlling the power supply device of the electrostatic filter, which is also not shown.
  • the computer 13 controls, inter alia, a display 15, by means of which the filter current and the filter voltage are displayed.
  • a power supply device 16 is also arranged in the control cabinet 12 and serves to supply power to the conversion device 9.
  • the power supply device 16 supplies the mains voltage of 220 volts.
  • the power supply device 16 consists of two connection terminals.
  • the mains voltage is fed to the conversion device 9 via the lines 17, which are also guided in the cable 11.
  • the voltage is then transformed down to typically 15 volts and rectified.
  • the cable 11 is fastened in the cabinets 1, 12 by means of cable clips, not shown.
  • the individual lines run from there to the data connections 18 and the energy supply connections 19.
  • the data connections 18 and the energy supply connections 19 are designed in a manner known per se.
  • the data lines 10 and the energy supply lines 17 can be distinguished at a glance and are therefore practically unmistakable. Furthermore, even if the power supply lines 17 are incorrectly connected to the data connection ends or vice versa, no contact is made. The energy supply lines 17 can therefore only be coupled to the energy supply connections 19. Likewise, the data lines 10 can only be coupled to the data connection ends.
  • the cable 11 has further lines 20 in addition to the data lines 10 and the power supply lines 17. These lines 20 are used to transmit further information from the transformer cabinet 1 to the control cabinet 12, for example the information about the transformer temperature.
  • the further lines 20 and their connection in the cabinets 1 and 12 were not shown in FIG. 1 for the sake of clarity. Because of the sheath 21 of the common cable 11, the optical waveguides 10 in particular are essentially not exposed to any mechanical loads.
  • optical fibers are used for data transmission, the detected current or voltage signals must be modulated. This compulsion requirement has also prevented the use of optical fibers for signal transmission because of the costs involved.
  • the overall combination of converting device 9, optical waveguides 10 and converting device 14 used is less expensive than previously known solutions. There are no longer any need for converters from 10 volts to 20 mA. Furthermore, in contrast to the past, only the secondary values have to be recorded, no longer the primary and secondary values.
  • the detected values are converted into frequency signals.
  • the frequency with which the LEDs are modulated is always different from zero. If the signal received by the demodulator 14 is no longer modulated, but rather uniform, this information can be used to detect an optical fiber break or another malfunction.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Description

Die Erfindung betrifft eine Anordnung zur Meßwerterfassung und Übertragung bei einem Elektrofilter, das über einen Hochspannungstransformator mit elektrischer Energie versorgt wird.The invention relates to an arrangement for data acquisition and transmission in an electrostatic filter which is supplied with electrical energy via a high-voltage transformer.

Die Aufgabe der vorliegenden Erfindung besteht darin, hochspannungsseitige Meßwerte sicher einer Meßwertverarbeitung zuzuführen.
Diese Aufgabe wird durch folgende Merkmale gelöst:

  • a) eine Meßwerterfassungseinrichtung für hochspannungsseitige Spannung und Strom mit einer nachgeschalteten Umsetzeinrichtung ist zusammen mit dem Hochspannungstransformator in einem Transformatorschrank angeordnet,
  • b) von der Umsetzeinrichtung im Transformatorschrank zu einem gesonderten Steuerschrank verlaufen als Lichtwellenleiter ausgebildete Datenleitungen, über die die modulierten Meßwerte von Strom und Spannung zu einer Meßwertverarbeitungseinrichtung übertragen werden,
  • c) die Umsetzeinrichtung wird durch vom Steuerschrank zum Transformatorschrank verlaufende Energieversorgungsleitungen mit elektrischer Energie versorgt,
  • d) Lichtwellenleiter und Energieversorgungsleitungen sind in einem gemeinsamen Kabel geführt.
The object of the present invention is to reliably supply measured values on the high-voltage side to measured value processing.
This task is solved by the following features:
  • a) a measured value detection device for high-voltage voltage and current with a downstream conversion device is arranged together with the high-voltage transformer in a transformer cabinet,
  • b) from the conversion device in the transformer cabinet to a separate control cabinet run data lines designed as optical fibers, via which the modulated measured values of current and voltage are transmitted to a measured value processing device,
  • c) the conversion device is supplied with electrical energy by power supply lines running from the control cabinet to the transformer cabinet,
  • d) Optical fibers and power supply lines are routed in a common cable.

Wenn die Leitungen vorkonfektionierte Stecker aufweisen, ist es auf besonders einfache Weise unmöglich gemacht, Fehlverdrahtungen vorzunehmen. Die Stecker können z.B. aus einem Schukostecker für die Energieversorgung und aus einem Sub-D-Stecker oder einem BNC-Stecker für die Datenleitung bestehen. Es besteht prinzipell aber auch die Möglichkeit, daß ein gemeinsamer Stecker verwendet wird, der z.B. aufgrund seiner Symmetrieeigenschaften nur in einer Lage steckbar ist.If the cables have pre-assembled plugs, it is made impossible in a particularly simple way to carry out incorrect wiring. The plugs can consist, for example, of a Schuko plug for the energy supply and a Sub-D plug or a BNC plug for the data line. In principle, there is also the possibility that a common connector is used, which can be plugged in only in one position, for example due to its symmetry properties.

Wenn die Datenleitungen und die Energieversorgungsleitungen unvertauschbar ausgebildetet sind, können die Leitungen auch ohne Stecker nicht miteinander verwechselt werden. Die Datenleitungen können beispielsweise als Flachbandkabel oder als Koaxialkabel ausgebildet sein, während für die Energieversorgung ein konventionelles Kupferkabel verwendet wird.If the data lines and the power supply lines are designed to be non-interchangeable, the lines cannot be confused with one another even without a plug. The data lines can be designed, for example, as a ribbon cable or as a coaxial cable, while a conventional copper cable is used for the energy supply.

Überraschenderweise sind auch Lichtwellenleiter als Datenleitungen verwendbar. Es hat sich nämlich herausgestellt, daß entgegen den Erwartungen der Fachwelt Lichtwellenleiter den mechanischen Belastungen im rauhen Industriebetrieb durchaus gewachsen sind, wenn sie entsprechend ummantelt sind. Wenn die Datenleitungen als Lichtwellenleiter ausgebildet sind, ist eine galvanische Entkopplung und damit eine Potentialtrennung zwischen Steuerschrank und Transformatorschrank gegeben. Dadurch kann es nicht geschehen, daß durch einen Potentialsprung, wie er beispielsweise bei einem Filterdurchschlag auftritt, die Meßwerterfassungseinrichtung zerstört wird. Es ergibt sich also eine höhere Betriebssicherheit.Surprisingly, optical fibers can also be used as data lines. It has turned out that, contrary to the expectations of experts, optical fibers can withstand the mechanical loads in rough industrial operation if they are coated accordingly. If the data lines are designed as optical fibers, there is galvanic decoupling and thus potential isolation between the control cabinet and the transformer cabinet. As a result, it cannot happen that the measured value detection device is destroyed by a potential jump, such as occurs, for example, in the event of a filter breakdown. This results in higher operational reliability.

Die Datenleitungen und die Energieversorgungsleitungen sind vorzugsweise in einem gemeinsamen Kabel geführt. Durch die Führung der Lichtwellenleiter in einem stabilen, gemeinsamen Kabel wird nämlich die mechanische Belastung der Lichtwellenleiter entscheidend reduziert. Es ist also gewährleistet, daß die Datenleitungen nicht abrupt unterbrochen werden.The data lines and the power supply lines are preferably routed in a common cable. By guiding the optical fibers in a stable, common cable, the mechanical load on the optical fibers is significantly reduced. This ensures that the data lines are not interrupted abruptly.

In dem gemeinsamen Kabel können auch noch weitere Leitungen, z.B. zur Überwachung der Transformatortemperatur, verlaufen.Additional lines, e.g. to monitor the transformer temperature.

Weitere Vorteile und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels, anhand der Zeichnungen sowie den weiteren Ansprüchen. Dabei zeigen:

  • FIG 1 eine Prinzipdarstellung des Auswertungssystems und
  • FIG 2 einen Querschnitt durch das verwendete Kabel.
Further advantages and details emerge from the following description of an exemplary embodiment, using the drawings and the further claims. Show:
  • 1 shows a schematic diagram of the evaluation system and
  • 2 shows a cross section through the cable used.

Gemäß FIG 1 ist im Transformatorschrank 1 der Hochspannungstransformator angeordnet. Vom Hochspannungstransformator ist der Übersichtlichkeit halber in FIG 1 nur die Sekundärwicklung 2 dargestellt. Die Ausgangsspannung der Sekundärwicklung 2 wird über die Gleichrichtereinheit 4 an das nicht dargestellte Elektrofilter angelegt. Ein Ausgang der Gleichrichtereinheit 4 ist über den Reihenwiderstand 3 mit Erde verbunden. Der andere Ausgang der Gleichrichtereinheit 4 ist über die Nebenwiderstände 5, 6 ebenfalls mit Erde verbunden. Die über die Leitungen 7, 8 abgegriffenen Signale sind proportional zum Filterstrom und zur Filterspannung.According to FIG 1, the high-voltage transformer is arranged in the transformer cabinet 1. For the sake of clarity, only the secondary winding 2 of the high-voltage transformer is shown in FIG. The output voltage of the secondary winding 2 is applied to the electrostatic filter (not shown) via the rectifier unit 4. An output of the rectifier unit 4 is connected to earth via the series resistor 3. The other output of the rectifier unit 4 is also connected to earth via the shunts 5, 6. The signals tapped via lines 7, 8 are proportional to the filter current and the filter voltage.

Die Leitungen 7, 8 werden der Umsetzeinrichtung 9 zugeführt. Die Umsetzeinrichtung 9 weist intern einen spannungsgesteuerten Oszillator (VCO) auf, der die eingespeisten Analog-Kleinsignale in Frequenzsignale umsetzt. Mit diesen Frequenzsignalen werden dann zwei nicht dargestellte Leuchtdioden angesteuert. Die Leuchtsignale werden in die Lichtwellenleiter 10 eingespeist, die im Kabel 11 zum Steuerschrank 12 geführt werden.The lines 7, 8 are fed to the conversion device 9. The conversion device 9 internally has a voltage-controlled oscillator (VCO) which converts the small analog signals fed into frequency signals. These frequency signals are then used to drive two light-emitting diodes (not shown). The light signals are fed into the optical fibers 10, which are guided in the cable 11 to the control cabinet 12.

Im Steuerschrank 12 ist eine Recheneinheit 13 angeordnet. Die Recheneinheit 13 weist u. a. einen Demodulator 14 auf, der die Lichtsignale der Leitungen 10 empfängt und in Digital-Signale umsetzt. Die so im Rechner 13 zur Verfügung stehenden Digitalwerte für Filterstrom und Filterspannung können dann im Rechner 13 weiterverarbeitet werden, z.B. zur Steuerung der ebenfalls nicht dargestellten Stromversorgungseinrichtung des Elektrofilters. Der Rechner 13 steuert u. a. eine Anzeige 15 an, mittels derer der Filterstrom und die Filterspannung angezeigt werden.A computing unit 13 is arranged in the control cabinet 12. The computing unit 13 has, inter alia, a demodulator 14, which receives the light signals of the lines 10 and converts them into digital signals. The digital values for filter current and filter voltage thus available in the computer 13 can then be processed further in the computer 13, for example for controlling the power supply device of the electrostatic filter, which is also not shown. The computer 13 controls, inter alia, a display 15, by means of which the filter current and the filter voltage are displayed.

Im Steuerschrank 12 ist ferner eine Stromversorgungseinrichtung 16 angeordnet, die der Stromversorgung der Umsetzeinrichtung 9 dient. Die Stromversorgungseinrichtung 16 liefert die Netzspannung von 220 Volt. Im einfachsten Fall besteht die Stromversorgungseinrichtung 16 aus zwei Anschlußklemmen. Die Netzspannung wird über die Leitungen 17, die ebenfalls im Kabel 11 geführt sind, der Umsetzeinrichtung 9 zugeführt. In der Umsetzeinrichtung 9 wird die Spannung dann auf typisch 15 Volt heruntertransformiert und gleichgerichtet.A power supply device 16 is also arranged in the control cabinet 12 and serves to supply power to the conversion device 9. The power supply device 16 supplies the mains voltage of 220 volts. In the simplest case, the power supply device 16 consists of two connection terminals. The mains voltage is fed to the conversion device 9 via the lines 17, which are also guided in the cable 11. In the conversion device 9, the voltage is then transformed down to typically 15 volts and rectified.

Das Kabel 11 ist in den Schränken 1, 12 mittels nicht dargestellter Kabelschellen befestigt. Von dort verlaufen die einzelnen Leitungen zu den Datenanschlüssen 18 und den Energieversorgungsanschlüssen 19. Die Datenanschlüsse 18 und die Energieversorgungsanschlüsse 19 sind dabei in an sich bekannter Weise ausgebildet.The cable 11 is fastened in the cabinets 1, 12 by means of cable clips, not shown. The individual lines run from there to the data connections 18 and the energy supply connections 19. The data connections 18 and the energy supply connections 19 are designed in a manner known per se.

Wegen der unterschiedlichen Art der Daten- bzw. Energieübertragung, nämlich im einen Fall Licht, im anderen Fall Strom, sind die Datenleitungen 10 und die Energieversorgungsleitungen 17 auf einen Blick unterscheidbar und daher praktisch unvertauschbar. Weiterhin wird selbst bei einem fehlerhaften Anschließen der Energieversorgungsleitungen 17 an die Datenanschlußenden bzw. umgekehrt kein Kontakt geschaffen. Die Energieversorgungsleitungen 17 können also nur an die Energieversorgungsanschlüsse 19 angekoppelt werden. Ebenso können die Datenleitungen 10 nur an die Datenanschlußenden angekoppelt werden.Because of the different types of data or energy transmission, namely light in one case and electricity in the other case, the data lines 10 and the energy supply lines 17 can be distinguished at a glance and are therefore practically unmistakable. Furthermore, even if the power supply lines 17 are incorrectly connected to the data connection ends or vice versa, no contact is made. The energy supply lines 17 can therefore only be coupled to the energy supply connections 19. Likewise, the data lines 10 can only be coupled to the data connection ends.

Wenn z. B. an die Lichtwellenleiter 10 vorkonfektionierte Stecker angeschlossen sind, kann auch die Möglichkeit eines fehlerhaften Anschließens der Energieversorgungsleitungen 17 an die Datenanschlüsse 18 bzw. der Datenleitungen 10 an die Energieversorgungsanschlüsse 19 mit Sicherheit ausgeschlossen werden.If e.g. B. are connected to the optical fiber 10 pre-assembled connectors, the possibility of incorrect connection of the power supply lines 17 to the data connections 18 and the data lines 10 to the power supply connections 19 can be excluded with certainty.

Gemäß FIG 2 weist das Kabel 11 außer den Datenleitungen 10 und den Energieversorgungsleitungen 17 noch weitere Leitungen 20 auf. Mittels dieser Leitungen 20 werden weitere Informationen vom Transformatorschrank 1 zum Steuerschrank 12 übertragen, beispielsweise die Information über die Transformatortemperatur. Die weiteren Leitungen 20 und ihr Anschluß in den Schränken 1 und 12 wurde der Übersichtlichkeit halber jedoch in FIG 1 nicht dargestellt. Aufgrund des Mantels 21 des gemeinsamen Kabels 11 sind insbesondere die Lichtwellenleiter 10 im wesentlichen keinen mechanischen Belastungen ausgesetzt.According to FIG. 2, the cable 11 has further lines 20 in addition to the data lines 10 and the power supply lines 17. These lines 20 are used to transmit further information from the transformer cabinet 1 to the control cabinet 12, for example the information about the transformer temperature. The further lines 20 and their connection in the cabinets 1 and 12 were not shown in FIG. 1 for the sake of clarity. Because of the sheath 21 of the common cable 11, the optical waveguides 10 in particular are essentially not exposed to any mechanical loads.

Da, wie oben erwähnt, Lichtwellenleiter zur Datenübertragung verwendet werden, müssen die erfaßten Strom- bzw. Spannungssignale zwangsweise moduliert werden. Auch dieser Zwang zur Modulation hat wegen der damit verbundenen Kosten bisher von der Verwendung von Lichtwellenleitern zur Signalübertragung abgehalten. Überraschenderweise ist jedoch trotzdem die verwendete Gesamtkombination von Umsetzeinrichtung 9, Lichtwellenleitern 10 und Umsetzeinrichtung 14 kostengünstiger als bisher bekannte Lösungen. Es werden nämlich keine Umsetzer von 10 Volt auf 20 mA mehr benötigt. Weiterhin müssen im Gegensatz zu früher nur noch die sekundärseitigen Werte erfaßt werden, nicht mehr die primär- und die sekundärseitigen Werte.Since, as mentioned above, optical fibers are used for data transmission, the detected current or voltage signals must be modulated. This compulsion requirement has also prevented the use of optical fibers for signal transmission because of the costs involved. Surprisingly, however, the overall combination of converting device 9, optical waveguides 10 and converting device 14 used is less expensive than previously known solutions. There are no longer any need for converters from 10 volts to 20 mA. Furthermore, in contrast to the past, only the secondary values have to be recorded, no longer the primary and secondary values.

Wie ebenfalls obenstehend erwähnt, werden die erfaßten Werte in Frequenzsignale umgesetzt. Die Frequenz, mit der die Leuchtdioden moduliert werden, ist stets von Null verschieden. Wenn das vom Demodulator 14 emfangene Signal also nicht mehr moduliert ist, sondern gleichförmig, kann diese Information zur Erkennung eines Lichtwellenleiterbruchs bzw. einer sonstigen Fehlfunktion verwendet werden.As also mentioned above, the detected values are converted into frequency signals. The frequency with which the LEDs are modulated is always different from zero. If the signal received by the demodulator 14 is no longer modulated, but rather uniform, this information can be used to detect an optical fiber break or another malfunction.

Claims (3)

  1. Arrangement for measured-value acquisition and transmission with an electrofilter which is supplied with electrical power by way of an h.v. transformer (2), having the following features:
    a) a measured-value acquisition device (3, 5, 6) for voltage and current on the high-voltage side, having a conversion device (9) connected downstream, is arranged together with the h.v. transformer (2) in a transformer cabinet (1),
    b) running from the conversion device in the transformer cabinet (1) to a separate control cabinet (12) there are data lines (10) formed as optical fibres by way of which the modulated measured values of current and voltage are transmitted to a measured-value processing device (13),
    c) the conversion device (9) is supplied with electrical power by means of power supply lines (17) running from the control cabinet (12) to the transformer cabinet (1),
    d) optical fibres (10) and power supply lines (17) are carried in a common cable.
  2. Arrangement according to claim 1, in which data lines (10) and power supply lines (17) are formed in a non-interchangeable manner.
  3. Arrangement according to claim 1, in which data lines (10) and power supply lines are provided with prefabricated plugs.
EP19930107164 1992-05-14 1993-05-03 Evaluation system for an electrofilter Expired - Lifetime EP0569815B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9206555U 1992-05-14
DE9206555U DE9206555U1 (en) 1992-05-14 1992-05-14 Evaluation system for an electrostatic precipitator

Publications (2)

Publication Number Publication Date
EP0569815A1 EP0569815A1 (en) 1993-11-18
EP0569815B1 true EP0569815B1 (en) 1997-08-20

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EP19930107164 Expired - Lifetime EP0569815B1 (en) 1992-05-14 1993-05-03 Evaluation system for an electrofilter

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DK (1) DK0569815T3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004036210B4 (en) * 2004-07-26 2006-08-31 Siemens Ag Control device and control method for electrostatic precipitators with a configurable number of parallel and serial filter zones

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EP0569815A1 (en) 1993-11-18
DE9206555U1 (en) 1992-07-02
DK0569815T3 (en) 1998-04-06
DE59307144D1 (en) 1997-09-25

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