DE2504841A1 - Phase-failure protection relay for AC motor - has transistor switches triggering cut-out when any one switch receives no base volt - Google Patents

Phase-failure protection relay for AC motor - has transistor switches triggering cut-out when any one switch receives no base volt

Info

Publication number
DE2504841A1
DE2504841A1 DE19752504841 DE2504841A DE2504841A1 DE 2504841 A1 DE2504841 A1 DE 2504841A1 DE 19752504841 DE19752504841 DE 19752504841 DE 2504841 A DE2504841 A DE 2504841A DE 2504841 A1 DE2504841 A1 DE 2504841A1
Authority
DE
Germany
Prior art keywords
phase
motor
failure protection
transistors
protection relay
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Withdrawn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
DE19752504841
Other languages
German (de)
Inventor
Josef Moehnle
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19752504841 priority Critical patent/DE2504841A1/en
Publication of DE2504841A1 publication Critical patent/DE2504841A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/12—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to underload or no-load
    • H02H3/13—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to underload or no-load for multiphase applications, e.g. phase interruption
    • 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
    • H02H7/09—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 over-voltage; against reduction of voltage; against phase interruption

Abstract

The phase-failure protection relay, which is used for an ac motor, has transistors (13-15) which are used for triggering the protective cut-out when any one of them receives no base voltage. The three transistors (13, 14, 15) are connected in emitter/collector series between the first supply pole and the protective cut-out mechanism and the base of each transistor is connected over a resistor to one end of a rectifier bridge output diagonal. The other end of the diagonal is connected to a common line that forms the first supply pole. The rectifier bridge input diagonal is coupled to a phase transformer.

Description

Phasenausfallschutzrelais für Drcbstrommotoren Die bis heute bekannten Schutzgeräte wie Bim@tallrelais oder Motorvollschutz erfüllen nicht in vollem Umfang die Aufg@be einen Drehstrommotor bei totalem Ausfall einer Phas@ oder bei einem sogenannten Wackelkontakt den Motor vom @etz zu trennen. Phase failure protection relays for three-phase motors The ones known to this day Protective devices such as bim @ tall relays or full motor protection do not fully meet the requirements the task of a three-phase motor in the event of a total failure of one phase or one so-called loose contact to separate the motor from the network.

Die Charakteristik der thermischen Relais stimmt nicht immer mit der der Motoren überein und außerdem sind die Verhältnisse im Leerlauf des Motors ganz andere wie bei Vollast.The characteristics of the thermal relays do not always match the of the engines and, moreover, the conditions when the engine is idling are perfect others like at full load.

Dazu kommt noch, daß Motoren mit großen Schwungmassen, sehr shcwer gegen Zweiphasenlauf @u schütsen sind.In addition, motors with large flywheels are very heavy are shot against two-phase run @u.

Die vorliegende Erfindung begegnet diesen Schwierimkeiten durch eine ständige Überwachung der Motorströme durch drei stromdurchflossene Spulen (1), (2) und (3) welche in den Sekundzärspulen (4), (5) und (6) eine Spannung induzieren, welche über die Gleichrichter (7), (8) und (9) und den nachgeschalteten Widerständen (10), (11) und (12) die Basisspannung für drei mit ihren Emitter = Kollektorstrecken in Reihe liegenden Schalttransistoren (13), (14) und (15) liefern.The present invention overcomes these difficulties through a constant monitoring of the motor currents by three current-carrying coils (1), (2) and (3) which induce a voltage in the secondary coils (4), (5) and (6), which via the rectifiers (7), (8) and (9) and the downstream resistors (10), (11) and (12) the base voltage for three with their emitter = collector paths supply switching transistors (13), (14) and (15) lying in series.

Die Arbeitsspannung für das Hil@srelais (16) wird beispielsweise über den Trafo (18) und den Gleichrichter (17) erzeugt.The working voltage for the Hil @ srelais (16) is, for example, about the transformer (18) and the rectifier (17) generated.

In diesem Kreis liegt auch der Kontakt (22) eiens thermischen Überstromrelais.The contact (22) of a thermal overcurrent relay is also located in this circle.

Mittles des Rilfsrelais (16) wird über die Kontakte (20) und (21), welche beim Anlauf kurzzeitig überbrückt werden, das Wechselstromschütz Bei Ausfall eines Phasenstromes schaltet der betreffende Transistor schnell ab, sodaß das Hilfsrelais (16) abfällt und der @otorschütz spannungslos wird.By means of the auxiliary relay (16), the AC contactor is activated via the contacts (20) and (21), which are briefly bridged during start-up If a phase current fails, the relevant transistor switches off quickly, so that the auxiliary relay (16) drops out and the motor contactor is de-energized.

Da das Hilfsrelais (16) zwischen Betriebs- und Abfallspannung eine große Differenz aufweist, bleibt auch bei Entlastung des Motors, also im Leerlauf, der Betriebszustand erhalten, zumal auch die Transistoren eine Spannungsdifferenz wischen Durchschalten und Sperren haben.Since the auxiliary relay (16) has a has a large difference, remains even when the engine is unloaded, i.e. when idling, the operating state is maintained, especially since the transistors also have a voltage difference wipe through switching and locking.

Claims (3)

PatentansprücheClaims 1. Phasenausfallschutzrelais für Drehstrommotoren gekennze chnet dadurch, daß Transistoren (13), (14) und (15) als Schalter ein Abfallen des Betriebsschützers bewirken, wenn einem davon keine Basisspannung über die Schaltglieder (4), (7), (12) / (5), (Gt.), (11) und (6), (9) und (io) zufließt.1. Phase failure protection relays for three-phase motors are characterized by that transistors (13), (14) and (15) as switches cause the operating contactor to drop out cause if one of them does not have a base voltage across the switching elements (4), (7), (12) / (5), (Gt.), (11) and (6), (9) and (io) flow in. 2. Anordnung nach Anspruch 1 dadurch gekennzeichnet, das dei Transistoren (13), (14), (15) mit ihren Emitter - Kollektorstreckent in Reihe geschaltet sind.2. Arrangement according to claim 1, characterized in that the transistors (13), (14), (15) are connected in series with their emitter-collector segments. 3. Anordnung nach Anspruch 1 dadurch gekennzeichnet, daß dre) stromdurchflossene Spulen in den konzentrisch angeordneten Spulen durch den Stromfluss in den Primärspulen Spannungen erzeugen, die zum Durchschalten von Transistoren geeignet sind.3. Arrangement according to claim 1, characterized in that three) current-carrying Coils in the concentrically arranged coils due to the current flow in the primary coils Generate voltages that are suitable for switching transistors through. L e e r s e i t eL e r s e i t e
DE19752504841 1975-02-06 1975-02-06 Phase-failure protection relay for AC motor - has transistor switches triggering cut-out when any one switch receives no base volt Withdrawn DE2504841A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19752504841 DE2504841A1 (en) 1975-02-06 1975-02-06 Phase-failure protection relay for AC motor - has transistor switches triggering cut-out when any one switch receives no base volt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752504841 DE2504841A1 (en) 1975-02-06 1975-02-06 Phase-failure protection relay for AC motor - has transistor switches triggering cut-out when any one switch receives no base volt

Publications (1)

Publication Number Publication Date
DE2504841A1 true DE2504841A1 (en) 1976-08-19

Family

ID=5938162

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19752504841 Withdrawn DE2504841A1 (en) 1975-02-06 1975-02-06 Phase-failure protection relay for AC motor - has transistor switches triggering cut-out when any one switch receives no base volt

Country Status (1)

Country Link
DE (1) DE2504841A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2565430A1 (en) * 1984-06-04 1985-12-06 Shinko Electric Co Ltd CIRCUIT DETECTING A RELAY FAILURE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2565430A1 (en) * 1984-06-04 1985-12-06 Shinko Electric Co Ltd CIRCUIT DETECTING A RELAY FAILURE

Similar Documents

Publication Publication Date Title
DE1181805B (en) Protective device for synchronous machines
DE2504841A1 (en) Phase-failure protection relay for AC motor - has transistor switches triggering cut-out when any one switch receives no base volt
DE436248C (en) Safety device to prevent inadmissible operating states when cascading asynchronous motors with commutator rear machines
DE756927C (en) Arrangement for tempering contact converters
DE10018372C2 (en) Circuit arrangement for inrush current limitation for a power supply
DE691022C (en) Excitation device for selective protection circuits
DE581352C (en) Protective device for multi-phase AC machines, especially single armature converters
DE1298626B (en) DC relay for AC operation
DE303446C (en)
DE698696C (en) Motor protection device with start lock
DE899064C (en) Protective device for electrical machines, especially for asynchronous motors
DE877634C (en) Contact converter for working on counter voltage with circuit breaker against reverse current
DE736927C (en) Multi-phase relay based on the Ferraris principle
DE252959C (en)
DE456165C (en) Separately excited excitation machine for generators in connection with a fast regulator according to the Tirrill system with two exciter windings connected against each other
DE426792C (en) Device for automatic triggering of the switch on three-phase motors in the event of overcurrent and in the event of unequal load in the phase lines
DE605178C (en) Protective device for single armature converters that either work alone or are connected in parallel with direct current sources that are also dependent on the alternating current side, without the interposition of protective switching devices
DE346716C (en) Overcurrent protection for direct current with transformer-generated auxiliary current
DE598244C (en) Selective protective circuit for parallel three-phase lines against short circuits with the help of opposing components
DE420454C (en) Switching arrangement for the protection of three-wire DC systems
DE955522C (en) Earth fault protection for single-phase generator
DE548222C (en) Contactor control for automatic starting of three-phase asynchronous motors
DE588600C (en) Protection device for multi-phase networks
DE616333C (en) Compensation unit for voltage division to limit the compensation processes that occur when the voltage changes
DE614650C (en) Fault protection device in electrical systems

Legal Events

Date Code Title Description
8141 Disposal/no request for examination