WO2008113308A1 - Procédé de production d'un signal d'erreur indiquant un état de charge inacceptable pour un moteur électrique et appareil électrique de protection de moteur permettant la mise en oeuvre dudit procédé - Google Patents

Procédé de production d'un signal d'erreur indiquant un état de charge inacceptable pour un moteur électrique et appareil électrique de protection de moteur permettant la mise en oeuvre dudit procédé Download PDF

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Publication number
WO2008113308A1
WO2008113308A1 PCT/DE2007/000514 DE2007000514W WO2008113308A1 WO 2008113308 A1 WO2008113308 A1 WO 2008113308A1 DE 2007000514 W DE2007000514 W DE 2007000514W WO 2008113308 A1 WO2008113308 A1 WO 2008113308A1
Authority
WO
WIPO (PCT)
Prior art keywords
electric motor
starting
temperature
thermal state
threshold
Prior art date
Application number
PCT/DE2007/000514
Other languages
German (de)
English (en)
Inventor
Hans-Joachim Herrmann
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to DE112007003510T priority Critical patent/DE112007003510A5/de
Priority to PCT/DE2007/000514 priority patent/WO2008113308A1/fr
Publication of WO2008113308A1 publication Critical patent/WO2008113308A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0816—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors concerning the starting sequence, e.g. limiting the number of starts per time unit, monitoring speed during starting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H6/00—Emergency protective circuit arrangements responsive to undesired changes from normal non-electric working conditions using simulators of the apparatus being protected, e.g. using thermal images

Definitions

  • the invention relates to a method for generating an error signal indicative of an impermissible load condition of an electric motor, in which a starting current measured value is detected which indicates a starting current flowing through the rotor of the electric motor, a starting time is detected during which the starting current through the rotor of the electric motor flows, a startup time threshold value is determined using the startup current measurement value, and the error signal is generated when the startup time exceeds the startup time threshold value.
  • the invention also relates to an electric motor protection device.
  • the invention has for its object to provide a generic method and a corresponding motor protection device in which the startup process is even more selectively turned off only when there is actually a risk to the electric motor.
  • this object is achieved by a method of the type mentioned, is provided in the invention that for determining the start-time threshold, a thermal state of the electric motor is used such that when classified as cold thermal state of the electric motor, a first start-up time Threshold value is determined and at a classified as warm thermal state of the
  • a second startup time threshold is determined, which is different from the first startup time threshold.
  • the effect is exploited that in the case of a "thermally cold” electric motor, a higher startup time threshold value can be used than with a “thermally warm” electric motor.
  • the cold electric motor still has thermal reserves, which are exploited by setting the appropriate start-up threshold. In this way, an electric motor starting from the cold state is not already shut down too early by using a conservative start-up threshold; its availability for the engine operator, for example for a production process, increases accordingly.
  • An advantageous embodiment of the method according to the invention provides that for determining the thermal state of the electric motor, the motor temperature of the electric motor is determined, wherein at an engine temperature that rises above a first temperature threshold, the thermal state of the electric motor is classified as warm and at an engine temperature that drops below a second temperature threshold, the thermal condition of the electric motor is considered cold.
  • the first and second temperature thresholds may be the same value.
  • a further advantageous embodiment of the method according to the invention is specified in that the first and the second start-up threshold value are respectively determined using a maximum starting current permissible for starting the electric motor and a maximum permissible starting time which matches the maximum starting current, the maximum permissible starting time Start time of the thermal state of the electric motor depends so that the rated for a cold thermal state of the electric motor first maximum allowable starting time is longer than that for a classified as warm thermal state of the electric motor second maximum allowable starting time. This is therefore advantageous because the sizes "maximum starting current" and matching the "maximum permissible starting time" are already specified by most engine manufacturers for the respective engine.
  • the first startup time threshold value is determined according to the equation
  • I A maximum starting current for starting the electric motor
  • I starting current measured value
  • t A / W at I R maximum permissible start-up time for the warm thermal state
  • the thermal state of the electric motor can be determined in various ways. For example, this can be provided according to an advantageous embodiment of the method according to the invention that at least one temperature sensor is used to determine the thermal state of the electric motor, with which a temperature of the electric motor is measured.
  • the direct determination of a temperature of an electric motor with a temperature sensor is too expensive, so that it is proposed according to an alternative advantageous embodiment, to determine the thermal state of the electric motor to use a thermal description model of the electric motor, the temperature of the electric motor as a function of height indicates the previously flowed by the electric motor currents. As a result, the electric motor is simulated as thermal storage, so to speak, which fills in dependence on the flowing stream
  • the above-mentioned object is achieved by a motor protection device with a data processing device which is set up to carry out the method according to the invention or one of its developments.
  • the figure shows a schematic process flow diagram of a method for producing gene of an error signal indicating an impermissible operating state of an electric motor.
  • an electric motor protection device 10 is shown schematically. It includes, inter alia, a data processing device which is set up to carry out the method explained below. For this purpose, individual function blocks of the data processing device are indicated in the figure. Although the functional blocks in the figure are shown representationally, these are usually not designed as separate circuit units, but instead are implemented with a device software running on the data processing device.
  • the data processing device has inputs IIa and IIb, via which input variables are detected.
  • the input IIa of the data processing device on the one hand, is followed by a computing component 15 for calculating a threshold value S k or S w .
  • this computing module 15 On the output side, this computing module 15 is connected to a setting input E12 of a threshold value stage 12.
  • the input IIa is further downstream of a second threshold stage 16, which is the output side connected to an input of a timer module 13.
  • the timer module 13 in turn connected on the output side to an input of the threshold stage 12.
  • the threshold stage 12 is followed by a block 14 for generating an error signal F, which indicates an impermissible state of a monitored by the motor protection device 10 electric motor.
  • a second input IIb of the data processing device is connected on the output side to a third threshold value stage 17, which on the output side can deliver a control signal U to a changeover switch 18.
  • the switch 18 is arranged to A (applied to k or to a second value t AiW a maximum permissible start-up time that it in response to the control signal U of the third threshold stage 17 a parameter input E15 of the computing block 15 with either a first value t.
  • These values t A / k and t A , w are stored in memory areas 20a, 20b of a data memory of the data processing device. The operation of the motor protection device 10 will be explained below.
  • the electric motor monitored by the motor protection device 10 If the electric motor monitored by the motor protection device 10 is started, it is briefly charged with a higher current than the rated current intended for continuous operation. For example, a fivefold rated current can flow during the start-up phase.
  • the motor protection device 10 monitors compliance with a start-up time permitted for this increased starting current, in order to avoid a thermal overload of the electric motor.
  • the current flowing through the rotor of the electric motor is monitored via the input IIa. If this exceeds a predetermined in the second threshold level 16 minimum current threshold, a startup process of the electric motor is detected.
  • the second threshold stage 16 monitors a circuit operation of the electric motor. As soon as the current flowing through the rotor of the electric motor exceeds the minimum current threshold predetermined in the second threshold value stage 16 - and thus a start of the starting operation of the electric motor is detected - a signal is transmitted to the timer 13, which then starts to determine the startup time t during which the startup process is performed to determine.
  • the start-up time t specified by the timer 13 is compared in the threshold stage 12 with a dynamically fixed start-up time threshold S k or S w . If the startup time t exceeds the startup time threshold S k or S w , a signal is output to the module 14 for generating the error signal F; the error signal F is generated. Normally, when the fault signal F is present, the starting operation of the electric motor is interrupted by opening a switch in order to prevent thermal overloading of the electric motor.
  • the startup time threshold value S k or S w In order to determine the startup time threshold value S k or S w , on the one hand the current flowing through the rotor of the electric motor during the startup process is detected in the form of a starting current measured value I. This acquisition takes place continuously, so that the startup time threshold value S k or S w can be adapted to the actual flowing starting current. Normally, however, a relatively constant value will be established as start-up flow, so that no greater changes in the value of the start-up time threshold value S k or S w due to fluctuating start-up currents are to be expected.
  • the starting time threshold value S k or S w is formed in the computing module 15 from the detected starting current measured value I.
  • the first start-up threshold S K is used according to:
  • the second start-up threshold S is used according to:
  • I A maximum starting current for starting the electric motor
  • I starting current measured value
  • t A , w at I A maximum permissible starting time for the warm thermal state.
  • the respective start-up threshold S k or S w is thus determined using specific variables of the electric motor (I A , t A # k or t A / W ) and the measured current I actually flowing through the rotor.
  • the decision as to which of the two startup time threshold values S k or S w is to be used is made by the electric motor protection device 10 on the basis of a temperature monitoring of the electric motor.
  • the second input IIb of the data processing device can be provided, for example via one or more temperature sensors (not shown), with temperature measured values of the electric motor.
  • the data processing device can make a decision as to whether the electric motor is in a cold or in a warm state by means of a temperature threshold comparison in the threshold stage 17.
  • thermal model of the electric motor forms the temperature state of the electric motor as a function of measured values, such as the current that has so far flowed through the motor and the time during which this current has flowed, from.
  • the electric motor is modeled as a kind of heat accumulator into which heat enters during periods of high load (high flowing current), ie the temperature in the store increases or out of phase during periods of low load (low flowing current) or standstill phases (no Flow of current) heat is released, ie, the temperature in the memory decreases.
  • high flowing current high flowing current
  • low flowing current low load
  • standstill phases no Flow of current
  • a thermal storage 19 is exemplified as a symbol for a thermal model of the electric motor.
  • the thermal memory 19 is shown outside of the motor protection device 10 for the sake of clarity, it is nevertheless part of the device software running on the data processing device of the motor protection device 10.
  • the thermal model is formed, for example, by corresponding differential equations adapted to the respective electric motor, which take into account the current flow in the electric motor.
  • the temperature value detected at the second input IIb is compared with a temperature threshold to determine whether the electric motor is to be classified as warm (the temperature is above a temperature threshold) or cold (the temperature is below a temperature threshold) ,
  • the use of two temperature thresholds is appropriate. If the engine temperature (the level of the thermal accumulator) rises above a first temperature threshold, then the electric motor is classified as warm. If the engine temperature (the level of the thermal accumulator) falls below a second temperature threshold, which is below the first temperature threshold value, then the electric motor is classified as cold.
  • These staggered thresholds avoid frequent swiping of the "warm” // cold X ⁇ decision, a so-called “rattle".
  • the values of the temperature threshold values can be used as parameters in the electric motor protection device 10 it is only necessary to ensure that the first temperature threshold value is above the second temperature threshold value.
  • the changeover switch 18 is controlled via a control signal U in such a way that it applies the parameter input E15 of the computing module 15 to the value t A, k for the maximum startup time for the cold electric motor ,
  • the startup time threshold S k is calculated with the maximum startup time t A / k for the cold electric motor according to the above equation (1).
  • the control signal U causes the changeover switch 18 to be switched over, so that in this case the parameter input E15 of the arithmetic unit 15 is supplied with the value t A , w for the maximum starting time for the warm electric motor.
  • the startup time threshold S w is calculated with the maximum startup time t A #w for the cold electric motor according to the above equation (2).
  • the start-up time threshold S k or S w determined in this way depending on the thermal state of the electric motor is supplied by the computing module 15 to the setting input E 12 of the threshold value stage 12.
  • This threshold stage 12 uses the set start-up threshold S k or S w for comparison with the detected start-up time t.
  • Electric motor is treated according to its (compared to the warm electric motor) extended maximum starting time; an error signal F and thus a shutdown of the electric motor is in this case only after expiry of a correspondingly longer startup time caused when the electric motor has not yet passed into its normal operation.

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  • Motor And Converter Starters (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

Procédé de production d'un signal d'erreur (F) indiquant un état de charge inacceptable pour un moteur électrique, qui comprend la détection d'une valeur de mesure de courant de démarrage (I) indiquant un courant de démarrage qui circule dans le rotor du moteur électrique, une durée de démarrage (t) pendant laquelle le courant de démarrage (I) circule dans le rotor du moteur électrique, la détermination d'une valeur de seuil de durée de démarrage (par ex. Sw) à l'aide de la valeur de mesure du courant de démarrage (I) et la production du signal d'erreur (I) lorsque la durée de démarrage (t) dépasse la valeur de seuil de durée de démarrage (par ex. Sw). La présente invention concerne également un appareil électrique de protection de moteur correspondant (10).
PCT/DE2007/000514 2007-03-16 2007-03-16 Procédé de production d'un signal d'erreur indiquant un état de charge inacceptable pour un moteur électrique et appareil électrique de protection de moteur permettant la mise en oeuvre dudit procédé WO2008113308A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112007003510T DE112007003510A5 (de) 2007-03-16 2007-03-16 Verfahren zum Erzeugen eines Fehlersignals, das einen unzulässigen Belastungszustand eines Elektromotors angibt, und elektrisches Motorschutzgerät zur Durchführung des Verfahrens
PCT/DE2007/000514 WO2008113308A1 (fr) 2007-03-16 2007-03-16 Procédé de production d'un signal d'erreur indiquant un état de charge inacceptable pour un moteur électrique et appareil électrique de protection de moteur permettant la mise en oeuvre dudit procédé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2007/000514 WO2008113308A1 (fr) 2007-03-16 2007-03-16 Procédé de production d'un signal d'erreur indiquant un état de charge inacceptable pour un moteur électrique et appareil électrique de protection de moteur permettant la mise en oeuvre dudit procédé

Publications (1)

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WO2008113308A1 true WO2008113308A1 (fr) 2008-09-25

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Country Status (2)

Country Link
DE (1) DE112007003510A5 (fr)
WO (1) WO2008113308A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012219240A1 (de) * 2012-10-22 2014-04-24 Conti Temic Microelectronic Gmbh Verfahren und Schaltungsanordnung zum Ansteuern eines Halbleiterschalters
EP3068039A1 (fr) 2015-03-09 2016-09-14 Kriwan Industrie-Elektronik Gmbh Procede de protection de moteurs electroniques contre les etats de fonctionnement critiques
US10403116B2 (en) 2017-06-20 2019-09-03 General Electric Company Electrical signature analysis of electrical rotating machines
EP3557760A1 (fr) * 2018-04-19 2019-10-23 Siemens Aktiengesellschaft Procédé de surveillance d'un temps de démarrage d'un moteur électrique
US10928814B2 (en) 2017-02-24 2021-02-23 General Electric Technology Gmbh Autonomous procedure for monitoring and diagnostics of machine based on electrical signature analysis

Citations (1)

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Publication number Priority date Publication date Assignee Title
US20040264073A1 (en) * 2003-06-26 2004-12-30 Zocholl Stanley E. Rotor thermal model for use in motor protection

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Publication number Priority date Publication date Assignee Title
US20040264073A1 (en) * 2003-06-26 2004-12-30 Zocholl Stanley E. Rotor thermal model for use in motor protection

Non-Patent Citations (2)

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Title
SAM F FARAG ET AL: "Intelligent Microprocessor-Based Devices Provide Advanced Motor Protection, Flexible Control, and Communication in Paper Mills", IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 33, no. 3, June 1997 (1997-06-01), XP011022195, ISSN: 0093-9994 *
VENKATARAMAN B ET AL: "Fundamentals of a motor thermal model and its applications in motor protection", PROTECTIVE RELAY ENGINEERS, 2005 58TH ANNUAL CONFERENCE FOR TEXAS A&M UNIVERSITY, TEXAS, USA APRIL 5-7, 2005, PISCATAWAY, NJ, USA,IEEE, 5 April 2005 (2005-04-05), pages 127 - 144, XP010794876, ISBN: 0-7803-8896-8 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012219240A1 (de) * 2012-10-22 2014-04-24 Conti Temic Microelectronic Gmbh Verfahren und Schaltungsanordnung zum Ansteuern eines Halbleiterschalters
DE102012219240B4 (de) * 2012-10-22 2015-02-05 Conti Temic Microelectronic Gmbh Verfahren und Schaltungsanordnung zum Ansteuern eines Halbleiterschalters
US9559666B2 (en) 2012-10-22 2017-01-31 Conti Temic Microelectronic Gmbh Method and circuit arrangement for actuating a semiconductor switch
EP3068039A1 (fr) 2015-03-09 2016-09-14 Kriwan Industrie-Elektronik Gmbh Procede de protection de moteurs electroniques contre les etats de fonctionnement critiques
DE102015103404A1 (de) * 2015-03-09 2016-09-15 Kriwan Industrie-Elektronik Gmbh Verfahren zum Schutz von elektronischen Motoren vor kritischen Betriebszuständen
US10389293B2 (en) 2015-03-09 2019-08-20 Kriwan Industrie-Elektronik Gmbh Method for the protection of electric motors from critical operating states
US10928814B2 (en) 2017-02-24 2021-02-23 General Electric Technology Gmbh Autonomous procedure for monitoring and diagnostics of machine based on electrical signature analysis
US10403116B2 (en) 2017-06-20 2019-09-03 General Electric Company Electrical signature analysis of electrical rotating machines
EP3557760A1 (fr) * 2018-04-19 2019-10-23 Siemens Aktiengesellschaft Procédé de surveillance d'un temps de démarrage d'un moteur électrique
WO2019201824A1 (fr) * 2018-04-19 2019-10-24 Siemens Aktiengesellschaft Procédé de surveillance d'une période de démarrage d'un moteur électrique

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