EP0806781B1 - Schaltung zur geschützten Versorgung einer elektrischen Last - Google Patents

Schaltung zur geschützten Versorgung einer elektrischen Last Download PDF

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Publication number
EP0806781B1
EP0806781B1 EP97400951A EP97400951A EP0806781B1 EP 0806781 B1 EP0806781 B1 EP 0806781B1 EP 97400951 A EP97400951 A EP 97400951A EP 97400951 A EP97400951 A EP 97400951A EP 0806781 B1 EP0806781 B1 EP 0806781B1
Authority
EP
European Patent Office
Prior art keywords
circuit
electronic switch
load
power supply
switch
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.)
Expired - Lifetime
Application number
EP97400951A
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English (en)
French (fr)
Other versions
EP0806781A1 (de
Inventor
Jean Abot
Alain Gousset
Nicolas Hertzog
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric Industries SAS
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 Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP0806781A1 publication Critical patent/EP0806781A1/de
Application granted granted Critical
Publication of EP0806781B1 publication Critical patent/EP0806781B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/541—Contacts shunted by semiconductor devices
    • H01H9/542—Contacts shunted by static switch means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H89/00—Combinations of two or more different basic types of electric switches, relays, selectors and emergency protective devices, not covered by any single one of the other main groups of this subclass
    • H01H89/06—Combination of a manual reset circuit with a contactor, i.e. the same circuit controlled by both a protective and a remote control device
    • 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
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/548—Electromechanical and static switch connected in series

Definitions

  • the present invention relates to a circuit for protected power supply of an electric charge in alternating current, this circuit comprising a switch electromechanical protection and a bidirectional electronic switch placed in series, downstream of the protection switch, and controlled by a control device to ensure gradual operation of the load; parallel to the switch electronic is mounted a shunt switch which ensures operation continuous charge.
  • the role of the protection switch is to protect the main path of current if a fault current is detected; its response time is however too long to effectively protect the electronic switch or the shunt switch during operation.
  • the present invention therefore aims to use a bypass contactor of standard dimensions whose protection is still ensured during the detection of a fault current.
  • the supply circuit is characterized in that connected in series to the shunt switch and upstream of it a component electric designed to establish a DC voltage across the switch electronic.
  • the electrical component preferably consists of a resistor or a transformer whose impedance is chosen so as to make it conductive, when an overload current appears in the circuit and during a phase of continuous operation of the load, the electronic switch to which is sent periodically control pulses.
  • FIG. 1 shows a supply circuit 10 for an electric charge such than a single- or multi-phase motor M.
  • the supply circuit 10 is connected to the conductors of a three-phase distribution network U, V, W.
  • an electromechanical protection switch 20 and a electronic switch 30 are placed on one or more phases and in series an electromechanical protection switch 20 and a electronic switch 30; the electronic switch 30 is controlled by a device pulse modulated control unit 40 for modulating the energy supplied to the motor.
  • a device pulse modulated control unit 40 for modulating the energy supplied to the motor.
  • Motor M is supplied only when the switch electromechanical protection 20, such as a circuit breaker comprising contacts movable cooperating with fixed contacts, is closed, then the device control 40 has closed the electronic switch 30, the current passing through a main current path C.
  • the switch electromechanical protection 20 such as a circuit breaker comprising contacts movable cooperating with fixed contacts
  • the electronic switch 30 is controlled by the control device pulse modulation 40 to thereby form an electronic dimmer to supply the motor with graduated energy during the start-up and slowing down so as to ensure progressiveness.
  • the electronic switch 30 is constituted by two thyristors mounted at the head spade in parallel or by any other bi-directional semiconductor switch controllable; it is connected by an upstream terminal 31 to the switch electromechanical protection 20 and by a downstream boom 32 to the motor M.
  • an electromechanical contactor of shunt 50 comprising main contacts 51, 52; the contactor understands also an electromagnet whose coil 53 has terminals connected to the command 40 and which determines the opening and closing of the contacts 51, 52. These contacts are closed outside of a motor start-up or braking phase when it is desired to supply the motor with unmodulated energy.
  • the current bypass through path C1 of contactor 50 prevents overheating thyristors.
  • a electrical component 60 capable of establishing a direct voltage V across the terminals of thyristors when the contacts 51, 52 of the contactor are closed.
  • the component electric 60 has an upstream terminal 61 connected to the upstream terminal 31 of the electronic switch 30 and a downstream terminal 62 connected to the upstream terminal 51 of the contactor 50, the downstream terminal 52 of which is connected to the static switch 30.
  • the electrical component 60 may consist of a resistor R ( Figure 1) or by a transformer T ( Figure 2).
  • the use of transformer T can allow to supply a branch circuit 11 of circuit 10.
  • the impedance of resistance R or the impedance of the primary of transformer T is chosen so as to establish a sufficient voltage V so that thyristors, on which the device 40 continuously sends pulses of control, be conductors at the passage of an overcurrent on the way to main current C.
  • FIG 3 shows the circuit of Figure 1 to which a device is added electric arc jump 70 of known type associated with switch 20.
  • the device 70 is for example an arc transfer electrode, located on the one hand at a short distance from the fixed upstream contact of the switch 20 connected to the network, and on the other hand connected to the downstream terminal 32 of the electronic switch 30.
  • the device 70 has the function of protect the electronic switch 30, during a phase of its operation, by drifting the current when an overcurrent appears on the main path C of current in order to prevent the switch 30 from being crossed by the arc current generated when the switch 20 contacts open.
  • the protective switch 20 is closed and then the control device 40 applies ignition signals to the thyristor control electrode or to make the thyristors conductive or non-conductive during the engine starting phase while the contactor 50 remains open.
  • control 40 shunts the thyristors by closing the contactor 50 which provides a continuous energy to the motor, the current flowing in the thyristors is then zero.
  • the device 40 When the contactor 50 is closed, the device 40 continuously sends control pulses to the thyristors which are however not conductive due to the voltage V at their bomes remaining below the threshold voltage boot.
  • Figure 4 illustrates the current patterns in the circuit and the voltage at the thyristor terminals when an overload current, due for example to a short circuit, appears on the current path C.
  • the current I c of the main path C increases, causing an increase in the current I Ct passing through the current path C1 when the shunt contactor 50 is closed.
  • the increase in current I C1 causes an increase in the voltage V across the terminals of the electronic switch 30 to reach the ignition voltage, which causes the conduction of the thyristors and therefore the passage through them of a current I T , representing part of the current I C.
  • the current I C1 increases but remains lower than the repulsion current I R of the contactor corresponding to the welding of the contacts.

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Control Of Ac Motors In General (AREA)

Claims (4)

  1. Stromkreis für die geschützte Versorgung einer elektrischen Last mit Wechselstrom. Der Stromkreis (10) umfasst einen Schutzschalter (20) und einen in Reihe geschalteten bidirektionalen elektronischen Schalter (30), der sich unterhalb des Schutzschalters (20) befindet und von einer Steuereinrichtung (40) gesteuert wird, um einen abgestuften Betrieb der Last zu gewährleisten. Parallel zu dem elektronischen Schalter (30) ist ein Nebenschlussschütz (50) geschaltet, das für einen Dauerbetrieb der Last sorgt. Ein elektrisches Bauteil (60) befindet sich oberhalb des Nebenschlussschützes (50) und ist mit letzterem in Reihe geschaltet. Seine Aufgabe ist, eine Gleichspannung (V) an die Klemmen des elektronischen Schalters (30) zu liefern. Die Impedanz des Bauteils wurde so gewählt, dass sie, beim Auftreten eines Überstroms im Stromkreis und während sich die Last im Dauerbetrieb befindet, den elektronischen Schalter (30), an den in regelmäßigen Abständen Steuerimpulse gesendet werden, leitend macht.
  2. Speisestromkreis gemäß dem Patentanspruch 1, der dadurch gekennzeichnet ist, dass das elektronische Bauteil (60) ein Widerstand ist.
  3. Speisestromkreis gemäß dem Patentanspruch 1, der dadurch gekennzeichnet ist, dass das elektronische Bauteil (60) ein Transformator ist, der einen Spannungspfad (11) des Speisestromkreises (10) versorgt.
  4. Speisestromkreis gemäß einem der vorherigen, beliebig wählbaren Patentansprüche. Er ist dadurch gekennzeichnet, dass er eine Vorrichtung mit Lichtbogenbildung (70) umfasst, die den elektronischen Schalter (30), bei Auftreten eines Überlaststromes während eines abgestuften Betriebes der Last, überbrückt.
EP97400951A 1996-05-10 1997-04-28 Schaltung zur geschützten Versorgung einer elektrischen Last Expired - Lifetime EP0806781B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9605956 1996-05-10
FR9605956A FR2748612B1 (fr) 1996-05-10 1996-05-10 Circuit pour l'alimentation protegee d'une charge electrique

Publications (2)

Publication Number Publication Date
EP0806781A1 EP0806781A1 (de) 1997-11-12
EP0806781B1 true EP0806781B1 (de) 2002-09-11

Family

ID=9492097

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97400951A Expired - Lifetime EP0806781B1 (de) 1996-05-10 1997-04-28 Schaltung zur geschützten Versorgung einer elektrischen Last

Country Status (9)

Country Link
US (1) US5953189A (de)
EP (1) EP0806781B1 (de)
AU (1) AU716799B2 (de)
BR (1) BR9703106A (de)
CZ (1) CZ293753B6 (de)
DE (1) DE69715296T2 (de)
FR (1) FR2748612B1 (de)
TW (1) TW463440B (de)
ZA (1) ZA973974B (de)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1016791C2 (nl) * 2000-12-04 2002-06-05 Holec Holland Nv Hybride elektrische schakelinrichting.
DK1733470T3 (da) 2004-04-05 2012-12-03 Siemens Ag Omskifterapparat til drivning af en motor samt en tilsvarende fremgangsmåde
US8072723B2 (en) * 2007-06-19 2011-12-06 General Electric Company Resettable MEMS micro-switch array based on current limiting apparatus
KR100954674B1 (ko) * 2008-02-05 2010-04-27 엘에스산전 주식회사 피크 전류 제한 장치
FR2930091B1 (fr) * 2008-04-09 2011-10-28 Schneider Electric Ind Sas Systeme a relais statique comprenant deux transistors de type jfet en serie
US8922957B2 (en) * 2008-04-30 2014-12-30 Keysight Technologies, Inc. Dynamic switch contact protection
WO2010150389A1 (ja) 2009-06-25 2010-12-29 東芝三菱電機産業システム株式会社 低周波遮断器
US8619395B2 (en) 2010-03-12 2013-12-31 Arc Suppression Technologies, Llc Two terminal arc suppressor
KR101044492B1 (ko) * 2010-04-23 2011-06-27 엘에스산전 주식회사 하이브리드 한류기
JP5106606B2 (ja) 2010-09-27 2012-12-26 三菱電機株式会社 放電システムおよび電動車両
CN102244510A (zh) * 2011-05-18 2011-11-16 广州市金矢电子有限公司 触发节能装置及晶闸管开关
DE102012214814A1 (de) 2012-08-21 2014-02-27 Siemens Aktiengesellschaft Motorstarter
US9954464B2 (en) 2012-11-19 2018-04-24 Siemens Aktiengesellschaft Switching device for controlling energy supply of a downstream electric motor
US9270119B2 (en) * 2013-05-24 2016-02-23 Eaton Corporation High voltage direct current transmission and distribution system
CN104660107A (zh) * 2013-11-21 2015-05-27 河南省济源市矿用电器有限责任公司 矿用隔爆兼本安质安全型双接触器低压交流软启动器
CN104730441B (zh) * 2013-12-20 2018-07-17 中国科学院宁波材料技术与工程研究所 晶闸管故障检测装置
CN104752080A (zh) * 2013-12-31 2015-07-01 北京新宇航世纪科技有限公司 具有消弧功能的感性负载直流开关
DE102016203755A1 (de) * 2016-03-08 2017-09-14 Siemens Aktiengesellschaft Motorstarter und Diagnoseverfahren
EP3410601A1 (de) * 2017-06-02 2018-12-05 General Electric Technology GmbH Schaltvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868549A (en) * 1973-04-26 1975-02-25 Franklin Electric Co Inc Circuit for protecting contacts against damage from arcing
FR2584529B1 (fr) * 1985-07-04 1995-01-06 Merlin Gerin Disjoncteur-contacteur electrique, notamment pour des batteries de condensateurs
FR2707437B1 (fr) * 1993-07-05 1995-08-11 Telemecanique Dispositif de protection et de commande pour charge électrique.

Also Published As

Publication number Publication date
FR2748612B1 (fr) 1998-06-19
US5953189A (en) 1999-09-14
ZA973974B (en) 1997-12-02
DE69715296T2 (de) 2003-06-12
FR2748612A1 (fr) 1997-11-14
AU2009897A (en) 1997-11-13
TW463440B (en) 2001-11-11
CZ293753B6 (cs) 2004-07-14
EP0806781A1 (de) 1997-11-12
DE69715296D1 (de) 2002-10-17
AU716799B2 (en) 2000-03-09
BR9703106A (pt) 1998-06-30
CZ142397A3 (cs) 1998-12-16

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