EP1573877A1 - Protective switch - Google Patents

Protective switch

Info

Publication number
EP1573877A1
EP1573877A1 EP03767611A EP03767611A EP1573877A1 EP 1573877 A1 EP1573877 A1 EP 1573877A1 EP 03767611 A EP03767611 A EP 03767611A EP 03767611 A EP03767611 A EP 03767611A EP 1573877 A1 EP1573877 A1 EP 1573877A1
Authority
EP
European Patent Office
Prior art keywords
evaluation unit
circuit breaker
monitoring variable
exceeded
motor
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Withdrawn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
EP03767611A
Other languages
German (de)
French (fr)
Inventor
Wolfgang Esser
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.)
Eaton Industries GmbH
Original Assignee
Moeller GmbH
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 Moeller GmbH filed Critical Moeller GmbH
Publication of EP1573877A1 publication Critical patent/EP1573877A1/en
Withdrawn legal-status Critical Current

Links

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
    • H02H7/085—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 against excessive load
    • H02H7/0852—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 against excessive load directly responsive to abnormal temperature by using a temperature sensor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/123—Automatic release mechanisms with or without manual release using a solid-state trip unit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/03—Application domotique, e.g. for house automation, bus connected switches, sensors, loads or intelligent wiring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0207—Mounting or assembling the different parts of the circuit breaker
    • H01H71/0228—Mounting or assembling the different parts of the circuit breaker having provisions for interchangeable or replaceable parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/04—Means for indicating condition of the switching device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/14—Protecting elements, switches, relays or circuit breakers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

Definitions

  • the invention relates to a circuit breaker, in particular a motor protection switch, with an actuating mechanism for closing and opening main contacts, with current sensors for detecting the phase currents and with an evaluation unit which processes the recorded values of the phase currents, compares them with adjustable error criteria and when the error criteria are exceeded triggers the actuating mechanism via a trigger magnet by outputting a trigger signal
  • Motor protection switches are designed with multiple poles according to document DE 35 45 930 A1 and have a corresponding number of main contacts.
  • the main contacts are closed or opened by an actuating mechanism either by hand or by a motor drive.
  • the bimetallic or magnetic triggers respond, which in turn release the latching device connected to the actuating mechanism and thus trigger the actuating mechanism, which leads to the opening of the main contacts.
  • a low-voltage circuit breaker with an electronic evaluation unit evaluates the instantaneous values of the phase currents flowing via the main contacts, which are detected via electromagnetic current sensors. If the adjustable overload values are exceeded, a delayed and if a short circuit occurs, an essentially undelayed trigger signal is sent to a trigger magnet, the armature of which then triggers the actuating mechanism by releasing the latching device.
  • the invention has for its object to improve protection for motorized systems.
  • the evaluation of an electrical monitoring variable which is provided by a temperature-dependent resistor connected to the motor-operated system to be switched and protected, and by switching off the motor, which is brought about by exceeding a critical temperature within the motor-operated system, with the extended evaluation unit a protective function is provided which also exists in addition to the usual protective functions based on the evaluation of the motor current.
  • the temperature-dependent resistor for example a thermistor, is attached either in the motor itself or within the driven system, for example at a temperature-critical bearing point.
  • the circuit breaker according to the invention represents a convenient alternative to the known combination of a contactor and an electronic motor protection relay with a thermistor monitoring function.
  • the invention enables an effective combination of the direct temperature monitoring function with the disconnector and main switch properties, such as the lockability of the handle of the circuit breaker ,
  • auxiliary relay and / or a lighting element is connected to the evaluation unit.
  • Auxiliary relay and, if appropriate, lighting element can advantageously be arranged in an additional module to be fitted to the circuit breaker.
  • FIG. 1 in spatial representation an embodiment of the circuit breaker according to the invention
  • FIG. 2 shows a basic illustration of the circuit breaker from FIG. 1.
  • FIG. 1 shows a three-pole motor protection switch as a circuit breaker 2 with a switch housing 4, a rotatable handle 6 mounted on the front for switching on and off, main connections 8 on the input side for feed lines and main connections 10 on the output side for supply lines to a motor as a consumer.
  • a setting regulator 12 is arranged on the front.
  • An additional module 14 is snapped onto the switch housing 4 from the front.
  • the additional module 14 has two measuring terminals 16 and two signaling terminals 18 and an LED lighting element 20.
  • the switch housing 4 there is a separable connection for all three poles from the main connections 8 on the feed side, via main contacts 22, to the main connections 10 on the consumer side Work machine, connected.
  • the main contacts 22 are opened and closed via an actuating mechanism 24 (also called a switch lock) either by means of the handle 6 or opened automatically when the phase currents flowing through the main contacts 22 exceed adjustable error criteria.
  • the instantaneous values of the phase currents are measured by a current sensor 26, for example an electromagnetic current transformer, and are fed to an electronic evaluation unit 28.
  • the evaluation unit 28 converts the measured current values into digital data and compares them with an adjustable error criterion, for example a limit value for the overload permissible for the motor 11.
  • the relevant error criterion is set with the setting controller 12, for example by accessing an adjusting resistor of the evaluation unit 28.
  • the evaluation unit 28 outputs a trigger signal to excite a trigger magnet 30, the armature of which then triggers the actuating mechanism 24, whereupon the main contacts 22 are opened and thus the motor 11 is automatically switched off.
  • the additional module 14 connected to the switch housing 4 is electrically connected to the evaluation unit 28 via a plug connector 32.
  • a temperature-dependent resistor in the form of a thermistor 34 is embedded in the stator of the motor 11 as a thermal sensor.
  • the electrical monitoring variable (current, voltage or resistance) supplied by the thermistor 34 is led to the evaluation unit 28 via the measuring terminals 16.
  • the monitoring variable for example the resistance value, is continuously detected via the evaluation unit 28. If the monitoring variable shows a significant change as a result of inadmissible heating of the motor 11, the evaluation unit 28 also emits a trigger signal which excites the trigger magnet 30 in this case. This triggers the actuation mechanism 24 and the subsequent opening of the main contacts 22 causes the thermally endangered motor 11 to be switched off.
  • the circuit breaker 2 has the usual protection options against overload and possibly against short circuit and offers additional protection by evaluating the motor temperature detected directly by the thermistor 34.
  • the lighting element 20 is activated via activated outputs 36 of the evaluation unit 28, so that the excess of the permissible temperature in the motor 11 is signaled optically at the circuit breaker 2.
  • the relay coil 38 of an auxiliary relay 40 arranged in the additional module 14 is excited via the activated outputs 36, as a result of which the associated relay contact 42 is actuated.
  • the motor 11 is switched off, signal lines connected to the relay Contact 42 connected signaling terminals 18 are connected, the exceeding of the permissible motor temperature can be reported remotely.
  • the monitoring variable detected by the evaluation unit 28 can be taken from a temperature-dependent resistor, which is attached at a critical point within the machine or system operated by the motor 11, in particular at a bearing threatened by hot running.
  • the present invention is also not limited to the embodiment described above.
  • the measuring terminals 16, the signaling terminals 18, the lighting element 20 and the auxiliary relay 40 do not necessarily have to be part of an additional component, but can be connected individually, in combination or as a whole to the switch housing 4.
  • the lighting element 20 or the auxiliary relay 40 and the signaling terminals 18 can be dispensed with.

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Generators And Motors (AREA)

Abstract

The invention relates to a protective switch comprising an actuating mechanism (24), main contacts (22), current sensors (26) for detecting the phase currents, and an evaluation unit (28), which compares the detected values with fault criteria that can be set and trips the actuating mechanism (24) when the fault criteria are exceeded. The evaluation unit (28) comprises means for detecting the change in a monitoring variable and for outputting a tripping signal in the event a critical change in the monitoring variable is exceeded. The monitoring variable is furnished by a temperature-dependent resistor (34) that is connected to a system, said system being operated by a motor (11) and supplied with power via the protective switch (2).

Description

Schutzschalterbreaker
Technisches GebietTechnical field
Die Erfindung betrifft einen Schutzschalter, insbesondere einen Motorschutzschalter, mit einem Betätigungsmechanismus zum Schließen und Öffnen von Hauptkontakten, mit Stromsensoren zum Erfassen der Phasenströme und mit einer Auswerteeinheit, welche die erfassten Werte der Phasenströme verarbeitet, mit einstellbaren Fehlerkrite- rien vergleicht und beim Überschreiten der Fehlerkriterien durch Ausgabe eines Auslösesignals den Betätigungsmechanismus über einen Auslösemagneten auslöstThe invention relates to a circuit breaker, in particular a motor protection switch, with an actuating mechanism for closing and opening main contacts, with current sensors for detecting the phase currents and with an evaluation unit which processes the recorded values of the phase currents, compares them with adjustable error criteria and when the error criteria are exceeded triggers the actuating mechanism via a trigger magnet by outputting a trigger signal
Stand der TechnikState of the art
Motorschutzschalter sind nach Druckschrift DE 35 45 930 A1 mehrpolig ausgebildet und besitzen eine entsprechende Anzahl von Hauptkontakten. Die Hauptkontakte werden über einen Betätigungsmechanismus entweder von Hand oder durch einen Motorantrieb geschlossen bzw. geöffnet. Bei einer andauernden Überlast bzw. bei einem kurzzeitigen Kurzschlussstrom sprechen Bimetallauslöser bzw. Magnetauslöser an, die ihrerseits die mit dem Betätigungsmechanismus verbundene Verklinkungseinrichtung lösen und damit den Betätigungsmechanismus auslösen, was zum Öffnen der Hauptkontakte führt.Motor protection switches are designed with multiple poles according to document DE 35 45 930 A1 and have a corresponding number of main contacts. The main contacts are closed or opened by an actuating mechanism either by hand or by a motor drive. In the event of a persistent overload or a short-circuit current, the bimetallic or magnetic triggers respond, which in turn release the latching device connected to the actuating mechanism and thus trigger the actuating mechanism, which leads to the opening of the main contacts.
Nach Druckschrift DE 43 23 356 C1 ist ein Niederspannungs-Leistungsschalter mit einer elektronischen Auswerteeinheit bekannt. Die Auswerteeinheit wertet die über elektromagnetische Stromsensoren erfassten Momentanwerte der über die Hauptkontakte fließenden Phasenströme aus. Beim Überschreiten einstellbarer Überlastwerte wird ein verzögertes und beim Auftreten einer Kurzschlusses wird ein im we- sentlichen unverzögertes Auslösesignal an einen Auslösemagneten geliefert, dessen Anker dann über das Lösen der Verklinkungseinrichtung den Betätigungsmechanismus zum Auslösen bringt.According to document DE 43 23 356 C1, a low-voltage circuit breaker with an electronic evaluation unit is known. The evaluation unit evaluates the instantaneous values of the phase currents flowing via the main contacts, which are detected via electromagnetic current sensors. If the adjustable overload values are exceeded, a delayed and if a short circuit occurs, an essentially undelayed trigger signal is sent to a trigger magnet, the armature of which then triggers the actuating mechanism by releasing the latching device.
Es ist allgemein bekannt, beispielsweise nach Druckschrift DE 93 02 254 U1, Motor- Schutzschalter mit Meldevorrichtungen zu verbinden, die über Hilfsschalter eine Kurz- schluss- oder Überlastauslösung signalisieren. Aus der Druckschrift DE 37 28 197 A1 ist ein elektronisches Motorschutzrelais bekannt, welches bei Überlastungen, die zur Gefährdung und Überhitzung des zu schützenden Motors führen können, ein Auslösesignal abgibt. Mit diesem Auslösesignal wird ein Schütz abgesteuert, welches den Motor abschaltet. Das Motorschutzrelais besitzt eine elektronische Auswerteeinheit, der einerseits über Stromwandler den Phasenströmen proportionale Messsignale zugeführt werden und die anderseits mit einem im Motor angeordneten Thermistor verbunden ist. Die Auswerteeinheit prüft die eingehenden Signale auf Kurzschluss, Überlastung, Asymmetrie, Phasenausfall und Temperaturüberschreitung. Werden durch die Signale festgelegte Kriterien überschritten, so wird ein Auslösesignal zum Abschalten des Schützes ausgegeben.It is generally known, for example according to document DE 93 02 254 U1, to connect motor circuit breakers to signaling devices which signal a short-circuit or overload release via auxiliary switches. From the document DE 37 28 197 A1, an electronic motor protection relay is known which emits a trigger signal in the event of overloads which can lead to the motor being protected and being overheated. With this trigger signal a contactor is switched off, which switches off the motor. The motor protection relay has an electronic evaluation unit, to which measuring signals proportional to the phase currents are fed on the one hand via current transformers and on the other hand is connected to a thermistor arranged in the motor. The evaluation unit checks the incoming signals for short circuit, overload, asymmetry, phase failure and temperature overshoot. If criteria defined by the signals are exceeded, a trigger signal is issued to switch off the contactor.
Darstellung der ErfindungPresentation of the invention
Der Erfindung liegt die Aufgabe zugrunde, den Schutz für motorbetriebene Anlagen zu verbessern.The invention has for its object to improve protection for motorized systems.
Erfindungsgemäß wird durch die Auswertung einer elektrischen Überwachungsgröße, die von einem mit der zu schaltenden und zu schützenden motorbetriebenen Anlage verbundenen temperaturabhängigen Widerstand geliefert wird, und durch Abschaltung des Motors, die durch Überschreiten einer kritischen Temperatur innerhalb der motorbetriebenen Anlage bewirkt wird, mit der erweiterten Auswerteeinheit eine Schutzfunktion bereitgestellt, die zusätzlich neben den üblichen, auf der Auswertung des Motorstroms beruhenden Schutzfunktionen besteht. Der temperaturabhängige Widerstand, beispielsweise ein Thermistor, ist entweder im Motor selbst oder innerhalb der angetriebenen Anlage, beispielsweise an einer temperaturkritischen Lagerstelle, angebracht. Der erfindungsgemäße Schutzschalter stellt eine komfortable Alternative zu der bekannten Kombination aus einem Schütz und einem elektronischem Motorschutzrelais mit Thermistorüberwachungsfunktion dar. Mit der Erfindung wird eine wirkungsvolle Vereinigung der direkten Temperaturüberwachungsfunktion mit den Trenner- und Hauptschaltereigenschaften, wie zum Beispiel die Abschließbarkeit der Handhabe des Schutzschalters, ermöglicht.According to the invention, the evaluation of an electrical monitoring variable, which is provided by a temperature-dependent resistor connected to the motor-operated system to be switched and protected, and by switching off the motor, which is brought about by exceeding a critical temperature within the motor-operated system, with the extended evaluation unit a protective function is provided which also exists in addition to the usual protective functions based on the evaluation of the motor current. The temperature-dependent resistor, for example a thermistor, is attached either in the motor itself or within the driven system, for example at a temperature-critical bearing point. The circuit breaker according to the invention represents a convenient alternative to the known combination of a contactor and an electronic motor protection relay with a thermistor monitoring function. The invention enables an effective combination of the direct temperature monitoring function with the disconnector and main switch properties, such as the lockability of the handle of the circuit breaker ,
Vorteilhafte Weiterbildungen der Erfindung bestehen darin, dass mit der Auswerteeinheit ein Hilfsrelais und bzw. oder ein Leuchtelement verbunden ist. Eine in der motor- betriebenen Anlage auftretende Übertemperatur wird im ersten Fall durch den Hilfs- relaiskontakt und über zugehörige Meldeklemmen als elektrische Meldung in die Ferne und im zweiten Fall als optische Meldung vor Ort signalisiert. Hilfsrelais und gegebenenfalls Leuchtelement können vorteilhaft in einem an den Schutzschalter anzubauenden Zusatzbaustein angeordnet sein.Advantageous further developments of the invention consist in that an auxiliary relay and / or a lighting element is connected to the evaluation unit. One in the motor In the first case, excess temperature occurring in the system being operated is signaled by the auxiliary relay contact and via associated signaling terminals as a remote electrical signal and in the second case as a visual signal on site. Auxiliary relay and, if appropriate, lighting element can advantageously be arranged in an additional module to be fitted to the circuit breaker.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus dem folgenden, anhand von Figuren erläuterten Ausführungsbeispiel. Es zeigenFurther details and advantages of the invention result from the following exemplary embodiment explained with reference to figures. Show it
Figur 1: in räumlicher Darstellung eine Ausführungsform des erfindungsgemäßen Schutzschalters; Figur 2: eine Prinzipdarstellung des Schutzschalters aus Fig. 1.Figure 1: in spatial representation an embodiment of the circuit breaker according to the invention; FIG. 2 shows a basic illustration of the circuit breaker from FIG. 1.
Bester Weg zur Ausführung der ErfindungBest way to carry out the invention
In Fig. 1 ist ein dreipoliger Motorschutzschalter als Schutzschalter 2 mit einem Schaltergehäuse 4, einer frontseitig angebrachten drehbaren Handhabe 6 zum Ein- und Ausschalten, zugangsseitigen Hauptanschlüssen 8 für Einspeiseleitungen und ab- gangsseitigen Hauptanschlüssen 10 für Versorgungsleitungen zu einem Motor als Verbraucher dargestellt. Frontseitig ist ein Einstellregler 12 angeordnet. Von der Frontseite ist auf das Schaltergehäuse 4 ein Zusatzbaustein 14 aufgerastet. Der Zusatzbaustein 14 weist zwei Messklemmen 16 und zwei Meldeklemmen 18 sowie ein LED-Leuchtelement 20 auf.1 shows a three-pole motor protection switch as a circuit breaker 2 with a switch housing 4, a rotatable handle 6 mounted on the front for switching on and off, main connections 8 on the input side for feed lines and main connections 10 on the output side for supply lines to a motor as a consumer. A setting regulator 12 is arranged on the front. An additional module 14 is snapped onto the switch housing 4 from the front. The additional module 14 has two measuring terminals 16 and two signaling terminals 18 and an LED lighting element 20.
Nach Fig. 2 besteht innerhalb des Schaltergehäuses 4 für alle drei Pole von den ein- speiseseitigen Hauptanschlüssen 8 eine trennbare Verbindung über Hauptkontakte 22 zu den verbraucherseitigen Hauptanschlüssen 10. Die verbraucherseitigen Anschlüsse 10 sind mit einem Motor 11 einer nicht weiter dargestellten motorbetriebenen Anlage, beispielsweise einer Arbeitsmaschine, verbunden. Die Hauptkontakte 22 werden über einen Betätigungsmechanismus 24 (auch Schaltschloss genannt) entweder mittels der Handhabe 6 geöffnet und geschlossen oder automatisch geöffnet, wenn die über die Hauptkontakte 22 fließenden Phasenströme einstellbare Fehlerkriterien überschreiten. Die Momentanwerte der Phasenströme werden durch je einen Stromsensor 26, beispielsweise einen elektromagnetischen Stromwandler, gemessen und einer elektronischen Auswerteeinheit 28 zugeführt. Die Auswerteinheit 28 wandelt die gemessenen Stromwerte in digitale Daten um und vergleicht sie mit einem einstellbaren Fehlerkrite- rium, beispielsweise einem Grenzwert für die für den Motor 11 zulässige Überlast. Das maßgebliche Fehlerkriterium wird mit dem Einstellregler 12 eingestellt, indem er beispielsweise auf einen Einstellwiderstand der Auswerteeinheit 28 zugreift. Die Auswerteeinheit 28 gibt beim Überschreiten des eingestellten Fehlerkriteriums ein Auslösesignal zur Erregung eines Auslösemagneten 30 aus, dessen Anker dann den Betätigungsme- chanismus 24 zum Auslösen bringt, worauf die Öffnung der Hauptkontakte 22 und damit die automatische Abschaltung des Motors 11 erfolgt.According to FIG. 2, within the switch housing 4 there is a separable connection for all three poles from the main connections 8 on the feed side, via main contacts 22, to the main connections 10 on the consumer side Work machine, connected. The main contacts 22 are opened and closed via an actuating mechanism 24 (also called a switch lock) either by means of the handle 6 or opened automatically when the phase currents flowing through the main contacts 22 exceed adjustable error criteria. The instantaneous values of the phase currents are measured by a current sensor 26, for example an electromagnetic current transformer, and are fed to an electronic evaluation unit 28. The evaluation unit 28 converts the measured current values into digital data and compares them with an adjustable error criterion, for example a limit value for the overload permissible for the motor 11. The relevant error criterion is set with the setting controller 12, for example by accessing an adjusting resistor of the evaluation unit 28. When the set error criterion is exceeded, the evaluation unit 28 outputs a trigger signal to excite a trigger magnet 30, the armature of which then triggers the actuating mechanism 24, whereupon the main contacts 22 are opened and thus the motor 11 is automatically switched off.
Der mit dem Schaltergehäuse 4 verbundene Zusatzbaustein 14 steht über einen Steckverbinder 32 in elektrischer Verbindung mit der Auswerteeinheit 28. In dem Ständer des Motors 11 ist ein temperaturabhängiger Widerstand in Form eines Thermistors 34 als thermischer Fühler eingebettet. Die von dem Thermistor 34 gelieferte elektrische Überwachungsgröße (Strom, Spannung oder Widerstand) wird über die Messklemmen 16 zu der Auswerteeinheit 28 geführt. Über die Auswerteeinheit 28 wird die Überwachungsgröße, beispielsweise der Widerstandswert, ständig erfasst. Zeigt die Überwa- chungsgröße infolge einer unzulässigen Erwärmung des Motors 11 eine deutliche Veränderung, gibt die Auswerteeinheit 28 auch in diesem Falle ein den Auslösemagneten 30 erregendes Auslösesignal ab. Damit wird ein Auslösen des Betätigungsmechanismus 24 und über die nachfolgende Öffnung der Hauptkontakte 22 das Abschalten des thermisch gefährdeten Motors 11 bewirkt.The additional module 14 connected to the switch housing 4 is electrically connected to the evaluation unit 28 via a plug connector 32. A temperature-dependent resistor in the form of a thermistor 34 is embedded in the stator of the motor 11 as a thermal sensor. The electrical monitoring variable (current, voltage or resistance) supplied by the thermistor 34 is led to the evaluation unit 28 via the measuring terminals 16. The monitoring variable, for example the resistance value, is continuously detected via the evaluation unit 28. If the monitoring variable shows a significant change as a result of inadmissible heating of the motor 11, the evaluation unit 28 also emits a trigger signal which excites the trigger magnet 30 in this case. This triggers the actuation mechanism 24 and the subsequent opening of the main contacts 22 causes the thermally endangered motor 11 to be switched off.
Der erfindungsgemäße Schutzschalter 2 weist die üblichen Schutzmöglichkeiten gegen Überlastung und gegebenenfalls gegen Kurzschluss auf und bietet einen zusätzlichen Schutz durch Auswertung der unmittelbar von dem Thermistor 34 erfassten Motortemperatur. Nach Überschreiten des Grenzwertes durch die vom Thermistor 34 gelieferte Überwachungsgröße wird das Leuchtelement 20 über aktivierte Ausgänge 36 der Auswerteeinheit 28 aufgesteuert, so dass am Schutzschalter 2 die Überschreitung der zulässigen Temperatur im Motor 11 optisch signalisiert wird. Gleichzeitig wird über die aktivierten Ausgänge 36 die Relaisspule 38 eines im Zusatzbaustein 14 angeordneten Hilfsrelais 40 erregt, wodurch der zugehörige Relaiskontakt 42 betätigt wird. Mit der Ab- Schaltung des Motors 11 kann damit über Signalleitungen, die an die mit dem Relais- kontakt 42 verbundenen Meldeklemmen 18 angeschlossen sind, die Überschreitung der zulässigen Motortemperatur in die Ferne gemeldet werden.The circuit breaker 2 according to the invention has the usual protection options against overload and possibly against short circuit and offers additional protection by evaluating the motor temperature detected directly by the thermistor 34. After the limit value has been exceeded by the monitoring variable supplied by the thermistor 34, the lighting element 20 is activated via activated outputs 36 of the evaluation unit 28, so that the excess of the permissible temperature in the motor 11 is signaled optically at the circuit breaker 2. At the same time, the relay coil 38 of an auxiliary relay 40 arranged in the additional module 14 is excited via the activated outputs 36, as a result of which the associated relay contact 42 is actuated. When the motor 11 is switched off, signal lines connected to the relay Contact 42 connected signaling terminals 18 are connected, the exceeding of the permissible motor temperature can be reported remotely.
Die Erfindung ist nicht auf die vorstehend beschriebene Anwendung beschränkt. So kann die von der Auswerteeinheit 28 erfasste Überwachungsgröße beispielsweise von einem temperaturabhängigen Widerstand abgenommen werden, der an einer kritischen Stelle innerhalb der vom Motor 11 betriebenen Maschine oder Anlage, insbesondere an einem durch Heißlaufen bedrohten Lager, angebracht ist.The invention is not limited to the application described above. For example, the monitoring variable detected by the evaluation unit 28 can be taken from a temperature-dependent resistor, which is attached at a critical point within the machine or system operated by the motor 11, in particular at a bearing threatened by hot running.
Die vorliegende Erfindung ist auch nicht auf die vorstehend beschriebene Ausführungsform beschränkt. So müssen die Messklemmen 16, die Meldeklemmen 18, das Leuchtelement 20 und das Hilfsrelais 40 nicht notwendigerweise Bestandteil eines Zusatzbausteins sein, sondern können einzeln, in Kombination oder insgesamt mit dem Schaltergehäuse 4 verbunden sein. Bei preiswerteren Ausführungen des Schutzschalters 2 kann auf das Leuchtelement 20 oder auf das Hilfsrelais 40 und die Meldeklemmen 18 verzichtet werden.The present invention is also not limited to the embodiment described above. Thus, the measuring terminals 16, the signaling terminals 18, the lighting element 20 and the auxiliary relay 40 do not necessarily have to be part of an additional component, but can be connected individually, in combination or as a whole to the switch housing 4. In the case of cheaper versions of the circuit breaker 2, the lighting element 20 or the auxiliary relay 40 and the signaling terminals 18 can be dispensed with.
Bezugszeichenliste:LIST OF REFERENCE NUMBERS
2 Schutzschalter2 circuit breakers
4 Schaltergehäuse4 switch housings
6 Handhabe6 handle
8; 10 Hauptanschlüsse8th; 10 main connections
11 Motor11 engine
12 Einstellregler12 adjustment controls
14 Zusatzbaustein14 additional module
16 Messklemmen16 measuring terminals
18 Meldeklemmen18 signaling terminals
20 Leuchtelement20 light element
22 Hauptkontakte22 main contacts
24 Betätigungsmechanismus24 operating mechanism
26 Stromsensoren26 current sensors
28 Auswerteeinheit28 evaluation unit
30 Auslösemagnet30 release magnet
32 Steckverbinder32 connectors
34 Thermistor34 thermistor
36 Ausgänge36 outputs
38 Relaisspule38 relay coil
40 Hilfsrelais40 auxiliary relays
42 Relaiskontakt 42 relay contact

Claims

A n s p r ü c h e Expectations
1. Schutzschalter mit einem Betätigungsmechanismus (24) zum Schließen und Öff- nen von Hauptkontakten (22), mit Stromsensoren (26) zum Erfassen der Phasenströme und mit einer Auswerteeinheit (28), welche die erfassten Werte der Phasenströme verarbeitet, mit einstellbaren Fehlerkriterien vergleicht und beim Überschreiten der Fehlerkriterien durch Ausgabe eines Auslösesignals den Betätigungsmechanismus (24) über einen Auslösemagneten (30) auslöst, dadurch ge- kennzeichnet, dass1. Circuit breaker with an actuating mechanism (24) for closing and opening main contacts (22), with current sensors (26) for detecting the phase currents and with an evaluation unit (28) which processes the recorded values of the phase currents, compares them with adjustable error criteria and triggers the actuating mechanism (24) via a trigger magnet (30) when the error criteria are exceeded by outputting a trigger signal, characterized in that
- eingangsseitig mit der Auswerteeinheit (28) verbundene Messklemmen (16) zum Anlegen einer elektrischen Überwachungsgröße vorgesehen sind und- Measuring terminals (16) connected to the evaluation unit (28) on the input side are provided for applying an electrical monitoring variable and
- die Auswerteeinheit (28) Mittel zum Erfassen einer Änderung der Überwachungsgröße und zur Abgabe eines Auslösesignals beim Überschreiten einer kritischen Änderung der Überwachungsgröße aufweist,- The evaluation unit (28) has means for detecting a change in the monitoring variable and for emitting a trigger signal when a critical change in the monitoring variable is exceeded,
- wobei die Überwachungsgröße von einem temperaturabhängigen Widerstand (34) geliefert wird, der mit einer motorbetriebenen und über den Schutzschalter (2) versorgten Anlage verbunden ist.- The monitoring variable is supplied by a temperature-dependent resistor (34) which is connected to a motor-operated system supplied by the circuit breaker (2).
2. Schutzschalter nach vorstehendem Anspruch, dadurch gekennzeichnet, dass durch die Auswerteeinheit (28) ein Hilfsrelais (40) beim Überschreiten der kritischen Änderung der Überwachungsgröße erregt wird.2. Circuit breaker according to the preceding claim, characterized in that the evaluation unit (28) excites an auxiliary relay (40) when the critical change in the monitoring variable is exceeded.
3. Schutzschalter nach vorstehendem Anspruch, dadurch gekennzeichnet, dass das Hilfsrelais (40) und mit diesem ausgangsseitig verbundene Meldeklemmen (18) in einem mit dem Schaltergehäuse (4) des Schutzschalters (2) verbindbaren Zusatzbaustein (14) angeordnet sind.3. Circuit breaker according to the preceding claim, characterized in that the auxiliary relay (40) and the signaling terminals (18) connected to this on the output side are arranged in an additional module (14) which can be connected to the switch housing (4) of the circuit breaker (2).
4. Schutzschalter nach einem der vorstehenden Ansprüche, dadurch gekennzeich- net, dass die Auswerteeinheit (28) ein Leuchtelement (20) beim Überschreiten der kritischen Änderung der Überwachungsgröße ansteuert. 4. Circuit breaker according to one of the preceding claims, characterized in that the evaluation unit (28) controls a lighting element (20) when the critical change in the monitoring variable is exceeded.
EP03767611A 2002-11-27 2003-11-22 Protective switch Withdrawn EP1573877A1 (en)

Applications Claiming Priority (3)

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DE10255168 2002-11-27
DE10255168A DE10255168A1 (en) 2002-11-27 2002-11-27 breaker
PCT/EP2003/013130 WO2004049535A1 (en) 2002-11-27 2003-11-22 Protective switch

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DE102005041543A1 (en) * 2005-08-31 2007-03-01 Siemens Ag Safety device for protecting electrical consumer loads e.g. electric motor, from overloading or excessive temperature rise, has evaluation unit to evaluate operating condition of thermistor and activates/deactivates thermistor as result
WO2007063080A1 (en) * 2005-12-01 2007-06-07 Arcelik Anonim Sirketi An electric motor
US7685447B2 (en) * 2006-07-05 2010-03-23 Eaton Corporation Circuit interrupter and method modulating configurable processor clock to provide reduced current consumption
FR2999791B1 (en) * 2012-12-18 2015-01-02 Schneider Electric Ind Sas MODULAR ELECTRICAL SWITCHING DEVICE COMPRISING AT LEAST ONE UNIPOLAR CUT-OFF BLOCK AND SWITCHING ARRANGEMENT HAVING SUCH DEVICES
US9036318B2 (en) * 2013-07-09 2015-05-19 Eaton Corporation Method of tripping a circuit interrupter in a back fed configuration
KR101614202B1 (en) * 2013-08-28 2016-04-21 주식회사 엘지화학 Current measurement relay apparatus

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US4470091A (en) * 1982-10-20 1984-09-04 Westinghouse Electric Corp. Productive relay apparatus for protection from sub-synchronous current oscillations in a power system
DE29713363U1 (en) * 1997-07-28 1998-01-08 ESG Elektroschaltgeräte Görlitz GmbH, 02827 Görlitz Molded housing for an evaluation module for full motor protection
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