EP2544204A1 - Procédé de détermination de la position de commutateurs séquentiels - Google Patents

Procédé de détermination de la position de commutateurs séquentiels Download PDF

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Publication number
EP2544204A1
EP2544204A1 EP12169411A EP12169411A EP2544204A1 EP 2544204 A1 EP2544204 A1 EP 2544204A1 EP 12169411 A EP12169411 A EP 12169411A EP 12169411 A EP12169411 A EP 12169411A EP 2544204 A1 EP2544204 A1 EP 2544204A1
Authority
EP
European Patent Office
Prior art keywords
resistance
tap changer
current
contact
line
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Withdrawn
Application number
EP12169411A
Other languages
German (de)
English (en)
Inventor
Oleg Bobylkov
Tobias Breinl
Stefan Schindler
Stefan Abelen
Karsten Viereck
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.)
Maschinenfabrik Reinhausen GmbH
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
Original Assignee
Maschinenfabrik Reinhausen GmbH
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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 Maschinenfabrik Reinhausen GmbH, Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG filed Critical Maschinenfabrik Reinhausen GmbH
Publication of EP2544204A1 publication Critical patent/EP2544204A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0027—Operating mechanisms
    • H01H9/0033—Operating mechanisms with means for indicating the selected tap or limiting the number of selectable taps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H2009/0061—Monitoring tap change switching devices

Definitions

  • the invention relates to a method for position detection of tap changers in the motor drive of the tap changer.
  • the respective current position of the tap changer is determined and passed as an electrical signal.
  • Such a position signaling device is in the WO 98/38662 described.
  • the tap changer is connected to a motor drive driving it.
  • the position of the tap changer is also clearly described in terms of initial position and end position.
  • the motor drive is thus the image of the position of the mechanically driven tap changer on a position indicator with a display shaft available.
  • a position indicator which takes place here with a pointer, electrically at a remote location, eg. As a control room to be able to transmit or provide this information for a control or regulating device, the mechanical rotation is converted into an electrical signal.
  • the WO 98/36435 shows such a known signal conversion. This signal conversion takes place via a contact finger, which moves at its angular movement individual contact positions, each corresponding to a specific position of the tap changer.
  • the WO 98/53276 describes a further position signaling device for tap changer, which consists of two separate modules, namely a signaling contact arrangement and a spatially separated, differently ausgestaltetbaren position detection module.
  • the information obtained in the signal contact arrangement information is transmitted to the position reporting module whose wiring is dependent on the manner of the desired display.
  • a series of resistors In one type of information processing described there is also provided a series of resistors.
  • the divider ratio as an image of the position of the tap changer is determined in such a way that either a constant voltage is applied to the total resistance at point n of the series of resistors or a constant current is fed into this total resistance.
  • the ratio of the voltage drops in both cases over the total resistance and the voltage between the contact finger and the beginning of the resistor chain R 1 to R n-1 is thus a unique value for identifying the tap changer position according to the voltage divider rule in known potentiometer circuits.
  • the WO 98/53276 also describes that this voltage value can be transmitted over greater distances.
  • the contact resistance of the contact finger for sensing the respective (step switch position-dependent) resistance divider ratio also affects the mapping of the real voltage value also negative. Dirt or oxide layers can increase the contact resistance extremely, especially at a high dust load or even less frequent operation of the tap changer and thus the contact finger, which also falsifies the result.
  • the object of the invention is to eliminate the disadvantages of the known methods and to provide an improved method using resistor arrangements, which excludes errors due to parasitic resistances as a result of contact resistance, lead resistances and their temperature dependence.
  • the invention is based on the following general idea: Was previously applied over the total resistance of the resistor chain, a constant voltage or a constant current to determine the resistance of the position of the tap changer imaging resistance can, according to this invention now by feeding a constant current directly to the terminal of the contact finger, which according to the prior art, the division ratio between the total resistance R ges and measuring resistor R Mess specified as part of R ges .
  • a known resistance chain consisting of a plurality of identical resistors R b , shown, between which in a likewise known manner, the individual taps, which correspond to the positions 1 ... n of the associated tap changer, are arranged. These taps are connected as contacts of the contact finger K, depending on the respective position of the tap changer. The direction of movement of the contact finger K is indicated by a double arrow.
  • a constant current I cal is applied to the contact finger K.
  • the hard-wired in the figure upper part of the resistor chain acts according to the invention only as a voltage sensor for the to be determined measuring resistor R Mess decreasing voltage, since the injected constant current I cal flows only through R meas .
  • R ges At the upper connection of R ges , only a very high-voltage voltage sensor OPV 2 is connected. This voltage sensor is realized here by an operational amplifier in voltage follower circuit.
  • the disturbing influencing variables which, as described, can cause measurement errors in the prior art.
  • this is the contact resistance R ü between the contact finger K and the individual contact points of the resistor row.
  • this is the line resistance R line or R line * , which is set in each case on the electrical connection lines at the beginning and end of the resistance chain and, moreover, is also temperature-dependent.
  • a high-impedance voltage sensor OPV 2 is designed as an operational amplifier. It is known in principle to use this basic circuit of an operational amplifier in voltage follower circuit to realize extremely high impedance input resistors and at the output with a low internal resistance for z. B. to provide an analog-to-digital conversion in an analog-to-digital converter ADC. Such a circuit may also be directly part of the internal circuit of an analog-to-digital converter circuit. The digital output of this circuit is directly connected to a microcontroller .mu.C to output the digital display value corresponding to the position of the tap changer, or to control the calibration of the entire measuring arrangement.
  • the calibration is performed separately for each resistor array since its total resistance can vary with the number of possible stages of the tap changer to be mapped.
  • Usual values are here z. B. 18 or 26 connected in series resistors, which represent 19 or 27 stage positions of the tap changer in these cases.
  • the calibration is software-controlled via a microcontroller ⁇ C and only requires the manual displacement of the sliding contact to the maximum total resistance of the resistor chain.
  • the grinder is positioned at R max and the current I cal is incrementally increased by the voltage controlled current source CPV1 until 90% of the maximum possible input voltage range of the ADC is utilized.
  • the microcontroller ⁇ C a digital-to-analog converter DAC, z. B. with 12-bit drive, d. H. it has the possibility of measuring the current and thus the voltage drop measured at the ADC over the entire resistance of the arrangement including the undesired line resistances in max. 4096 equidistant steps to change.
  • Ohm's law requires that the current source supply a significantly higher current than the larger total resistance for small total resistance of the resistor contact row.
  • the current increase during the calibration process is not linear, but is realized on the software side via a PI controller (proportional-integral controller).
  • the step size is initially increased in order to reduce the difference to the setpoint as quickly as possible.
  • the approach to the 90% then takes place in the target area in ever smaller voltage increments.
  • the program checks whether the measured value is within the specified tolerance band (89.0% - 90.5%) and, if necessary, increases or decreases the impressed current to a constant value over three measuring cycles.
  • the bottom line resistance is also subtracted for all subsequent measurements to determine the position of the contact finger.
  • the upper line resistance R line * does not matter because this path remains de-energized and only the sampling of the voltage drop of the feed point of the current I cal at the grinder is used because the input resistance R is one of OPV2 order of magnitude higher than the line resistance R line * .
  • a contribution to the resistance calculation can only make the current-carrying path, starting from the feed point on the contact finger up to and including the line resistance R line .
  • Decisive feature of the invention is the fact that also the size of the contact resistance R ü from the contact finger on the contact path can not affect the resistance measurement, since the voltage measurement via the hard-wired path of the resistor chain, which also also does not flow through current.
  • a changing contact resistance R ü causes only a changed modulation of the current source via OPV1, but the measuring or calibration current I cal remains constant.
  • the essential advantage of the method according to the invention is that the resistance resistors R ü which are also present here, as well as the line resistances R line and R line *, no longer enter the measurement result as errors in contrast to the methods known from the prior art; rather, in the method according to the invention an undistorted image of the respective tap changer position is generated.

Landscapes

  • Measurement Of Resistance Or Impedance (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
EP12169411A 2011-07-06 2012-05-25 Procédé de détermination de la position de commutateurs séquentiels Withdrawn EP2544204A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110106804 DE102011106804A1 (de) 2011-07-06 2011-07-06 Verfahren zur Stellungserfassung von Stufenschaltern

Publications (1)

Publication Number Publication Date
EP2544204A1 true EP2544204A1 (fr) 2013-01-09

Family

ID=46353996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12169411A Withdrawn EP2544204A1 (fr) 2011-07-06 2012-05-25 Procédé de détermination de la position de commutateurs séquentiels

Country Status (2)

Country Link
EP (1) EP2544204A1 (fr)
DE (1) DE102011106804A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104111362A (zh) * 2014-07-24 2014-10-22 富阳兴远仪器仪表经营部 用干电池为电源的电压测量仪
WO2022128314A1 (fr) * 2020-12-17 2022-06-23 Maschinenfabrik Reinhausen Gmbh Dispositif adaptateur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0078464A1 (fr) * 1981-10-29 1983-05-11 Firma Carl Zeiss Régulation optique pour couches électrochromiques
DE3515027A1 (de) * 1984-04-26 1985-10-31 Ferranti plc, Gatley, Cheadle, Cheshire Verfahren zum ueberwachen des kontaktverschleisses an transformatoren
WO1998036435A1 (fr) 1997-02-14 1998-08-20 Maschinenfabrik Reinhausen Gmbh Dispositif de signalisation de position
WO1998038662A1 (fr) 1997-02-25 1998-09-03 Maschinenfabrik Reinhausen Gmbh Indicateur de position
WO1998053276A1 (fr) 1997-05-16 1998-11-26 Maschinenfabrik Reinhausen Gmbh Dispositif de signalisation de position pour commandes par moteur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0078464A1 (fr) * 1981-10-29 1983-05-11 Firma Carl Zeiss Régulation optique pour couches électrochromiques
DE3515027A1 (de) * 1984-04-26 1985-10-31 Ferranti plc, Gatley, Cheadle, Cheshire Verfahren zum ueberwachen des kontaktverschleisses an transformatoren
WO1998036435A1 (fr) 1997-02-14 1998-08-20 Maschinenfabrik Reinhausen Gmbh Dispositif de signalisation de position
WO1998038662A1 (fr) 1997-02-25 1998-09-03 Maschinenfabrik Reinhausen Gmbh Indicateur de position
WO1998053276A1 (fr) 1997-05-16 1998-11-26 Maschinenfabrik Reinhausen Gmbh Dispositif de signalisation de position pour commandes par moteur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104111362A (zh) * 2014-07-24 2014-10-22 富阳兴远仪器仪表经营部 用干电池为电源的电压测量仪
WO2022128314A1 (fr) * 2020-12-17 2022-06-23 Maschinenfabrik Reinhausen Gmbh Dispositif adaptateur

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DE102011106804A1 (de) 2013-01-10

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