EP0944295B1 - Überwachungseinrichtung für Beleuchtungssysteme gebildet aus mehreren Lampen in Reihenschaltung - Google Patents

Überwachungseinrichtung für Beleuchtungssysteme gebildet aus mehreren Lampen in Reihenschaltung Download PDF

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Publication number
EP0944295B1
EP0944295B1 EP99104798A EP99104798A EP0944295B1 EP 0944295 B1 EP0944295 B1 EP 0944295B1 EP 99104798 A EP99104798 A EP 99104798A EP 99104798 A EP99104798 A EP 99104798A EP 0944295 B1 EP0944295 B1 EP 0944295B1
Authority
EP
European Patent Office
Prior art keywords
mesh
operative
load
safety device
series
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
EP99104798A
Other languages
English (en)
French (fr)
Other versions
EP0944295A3 (de
EP0944295A2 (de
Inventor
Basile Gianluigi
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OCEM SpA
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OCEM SpA
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Publication date
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Publication of EP0944295A2 publication Critical patent/EP0944295A2/de
Publication of EP0944295A3 publication Critical patent/EP0944295A3/de
Application granted granted Critical
Publication of EP0944295B1 publication Critical patent/EP0944295B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/46—Circuits providing for substitution in case of failure of the lamp
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2855—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions

Definitions

  • the present invention relates to a safety devices associated to feeding devices for a plurality of lamps connected in series, in particular for discharge lamps, that are used in industrial and/or public lighting systems.
  • Lighting systems of medium-high power which have heretofore been provided, often use discharge lamps connected preferably in series.
  • the traditional systems are provided with a current transformer in series with the load mesh, generally with the secondary winding of the power supply transformer, which operates, by a suitable control unit, transition and protection devices provided on the supply mesh, i.e. on the primary winding of the power supply transformer ( Figure 1).
  • This undesired situation can occur with particular frequency in all lighting systems which are operated only for a predetermined period of time, i.e. in accordance with discontinued cycles.
  • Document WO-A-87/07730 discloses a fixture for checking the continuity of a cable having wires running between terminals in two end connectors.
  • the cable is designed so that a single path is provided by each wire and its associated terminals.
  • the connectors are plugged into mating receptacles on the fixture which also includes an array of associated light emitting diodes and an array of pins. The user touches the stylus of a manually movable probe against each pin. Only the associated light emitting device will be energised if there is good continuity for a given path in the cable.
  • Non energising of the associated device or energising any other device indicates a lack of continuity and the source thereof.
  • Document WO-A-74/18811 describes a method and apparatus for feeding a plurality of fluorescent lamps connected in series which are fed at the start-up with a variable voltage having a frequency that is varied during a selected time period, between a minimum value and a maximum value. This makes the start-up of the lamps taking place with a convenient voltage value. Subsequently, the lamps are fed with constant current having nominal frequency.
  • Document EP 768.810 discloses a ground fault detection system for airfield lighting systems, including electronic circuitry arranged to detect a ground fault of the lighting system. The current sensed by the leakage sensing circuitry is recorded and the current measured value of current flow is then related to the extent of ground fault condition. The function of the device is long term monitoring of the insulation resistance of the high voltage series circuit.
  • this invention was evolved with the general object of providing a safety device for lighting systems formed by a plurality of loads, preferably lamps connected in series, which can verify the metallic continuity of the system, in which it is disposed, before power is applied.
  • Another object of the present invention is to propose a safety device, which guarantees safety for persons present near the system, in the whole area occupied by this system.
  • Yet another object of the present invention is to propose a safety device, which is obtained by a simple technical solution, which is extremely functional, reliable and cheap and which can be used also in already existing and/or obsolete systems.
  • reference numeral 3 generally designates a plurality of loads, e.g. discharge lamps, connected in series and supplied by outlet terminals of a first generator GAC.
  • loads e.g. discharge lamps
  • the first generator GAC is preferably an AC generator, capable of supplying a voltage V2 variable within acceptable values.
  • the input terminals of the first generator GAC are supplied via a first switching means 4 connected to a control unit C.
  • the proposed safety device 1 is connected in series with the lamps 3, which define a load mesh 3a supplied by the output terminals of the first generator GAC.
  • An electric contactor 11, normally closed, and a detection mesh 3b are connected to the output terminals of the safety device 1.
  • the detection mesh 3b that is power supplied by a second generator GDC, e.g. a low voltage generator, includes a pair of second electric contactors 12, mechanically connected to each other and normally open, an impedance Z, preferably with high power factor, and a current measuring device 90.
  • a second generator GDC e.g. a low voltage generator
  • An isolation electric contactor 13, normally closed and connected to earth, is connected to the output terminals of the second generator GDC, that is preferably a DC generator. According to known techniques, the isolation electric contactor is connected to earth via a low impedance connection, that produces a zero reference potential.
  • All the electric contactors that is the first electric contactor 11, the second electric contactors 12 and the isolation electric contactor 13, are operated in proper phase relation, by a unique actuator 10, e.g. an electric-mechanical relay operated in turn by the control unit C.
  • a unique actuator 10 e.g. an electric-mechanical relay operated in turn by the control unit C.
  • the first electric contactor 11 and the isolation electric contactor 13 of the safety device 1 keep their closed position, while the second electric contactors 12 are open ( Figure 2).
  • This condition can often occur in those systems which do not work continuously, typically a lightening system, and is particularly dangerous for people located close to the failure point.
  • the safety device 1 can be activated.
  • the safety device 1 can be operated manually or by the control unit C, only if the first generator GAC is not powered.
  • the load mesh 3a can be connected in series with the detection mesh 3b by the relay 10, that opens the electric contactor 11.
  • Opening of the first electric contactor 11 determines an operative condition 0 for the safety device 1.
  • the second generator GDC sends a predetermined detection continue current, that runs through the load mesh 3a and the detection mesh 3b ( Figure 3).
  • the control unit C stores this data and, possibly, operates the first switching means 4 to close, so that the lamps 3 are powered.
  • the failure is displayed by means of a predetermined sound or optical signal.
  • the safety device 1 By checking the integrity of the lighting system in which it is installed, the safety device 1 prevents all possible anomalous and dangerous effects provoked by the full supply voltage on the terminals of a single load 3, both because of the high value and because of the risky way in which this condition occurs.
  • the claimed solution prevents various possible accidents for the maintenance team and for other people, that inadvertently can take an excessively close position in the operation zone of the lighting system.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Claims (3)

  1. Beleuchtungssystem mit mehreren Lampen (3), die in einem Lastkreis (3a) in Reihe geschaltet sind, welcher von einem ersten Generator (GAC) gespeist wird, welcher mit einer Leistungsversorgung über erste Schaltmittel (4) verbunden ist, einer Steuereinheit (C), die mit den Schaltmitteln (4) verbunden ist, um die Leistungszufuhr zu dem ersten Generator (GAC) zu steuern, und einer Sicherheitseinrichtung, welche Sicherheitseinrichtung (1) umfasst:
    einen Detektorkreis (3b), der einen zweiten Generator (GDC) enthält, und ein Messmittel (90), das mit dem Detektorkreis in Reihe geschaltet ist, um den durch den Detektorkreis (3b) fließenden Strom zu messen und dadurch die Kontinuität des Lastkreises (3a) zu prüfen;
    welche Sicherheitseinrichtung dadurch gekennzeichnet ist, dass:
    erste Betriebsmittel (11) mit dem Lastkreis (3a) in Reihe geschaltet sind und von einem Aktuator (10) betätigt werden, der von der Steuereinheit (C) in Phasenbeziehung zu dem Deaktivierungszustand der Schaltmittel (4) betätigt wird, wobei die ersten Betriebsmittel (11) zwischen zwei Stellungen bewegbar sind, und zwar eine Außerbetriebsstellung (I), in der sie den Lastkreis (3a) schließen, und eine Betriebsstellung (O), in der der Lastkreis (3a) offen ist, und zwar wegen Unterbrechung des Lastkreises (3a), da die Anschlüsse der Betriebsmittel (11) voneinander abgetrennt sind;
    dass der Detektorkreis (3b) von den Anschlüssen der Betriebsmittel (11) abgeleitet ist, wenn sie sich in der Betriebsstellung (O) befinden;
    dass die Strom-Messmittel (90) mit der Steuereinheit (C) verbunden sind;
    dass die Strom-Messmittel (90) im Betrieb die Steuereinheit (C) darüber informiert, ob es, wenn sich die ersten Betriebsmittel (11) in der Betriebsstellung (O) befindet, einen Stromfluss gibt;
    dass die Steuereinheit (C) im Betrieb den Betrieb der ersten Betriebsmittel (11) und der ersten Schaltmittel (4) und somit eine Leistungszufuhr zu dem Lastkreis (3a) erst zulässt, nachdem der Stromfluss durch den Lastkreis (3a) und den Detektorkreis (3b) in der Betriebsstellung (O) der ersten Betriebsmittel (11) detektiert worden ist.
  2. Sicherheitseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Detektorkreis (3b) umfasst: mindestens eine Impedanz (Z) zum Begrenzen des durch den Detektorkreis (3b) fließenden Stromes und zweite Betriebsmittel (12), die in Phasenbeziehung zu den ersten Betriebsmitteln (11) durch den Aktuator (10) aufgrund eines von der Steuereinheit (C) empfangenen Befehls betätigt werden, um den Detektorkreis (3b) vom Lastkreis (3a) abzutrennen, wenn die ersten Betriebsmittel (11) in die Außerbetriebsstellung (I) eingestellt sind.
  3. Sicherheitseinrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die ersten und zweiten Betriebsmittel (11, 12) elektrische Schalter umfassen.
EP99104798A 1998-03-13 1999-03-11 Überwachungseinrichtung für Beleuchtungssysteme gebildet aus mehreren Lampen in Reihenschaltung Expired - Lifetime EP0944295B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT98BO000156A IT1299901B1 (it) 1998-03-13 1998-03-13 Dispositivo di sicurezza per impianti di illuminazione costituiti da una pluralita' di carichi collegati in serie.
ITBO980156 1998-03-13

Publications (3)

Publication Number Publication Date
EP0944295A2 EP0944295A2 (de) 1999-09-22
EP0944295A3 EP0944295A3 (de) 2000-08-23
EP0944295B1 true EP0944295B1 (de) 2004-01-07

Family

ID=11343027

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99104798A Expired - Lifetime EP0944295B1 (de) 1998-03-13 1999-03-11 Überwachungseinrichtung für Beleuchtungssysteme gebildet aus mehreren Lampen in Reihenschaltung

Country Status (7)

Country Link
EP (1) EP0944295B1 (de)
AT (1) ATE257639T1 (de)
DE (1) DE69914008T2 (de)
DK (1) DK0944295T3 (de)
ES (1) ES2213304T3 (de)
IT (1) IT1299901B1 (de)
PT (1) PT944295E (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994018811A1 (en) * 1993-02-04 1994-08-18 O.C.E.M. S.P.A. Method for feeding a plurality of discharge or fluorescent lamps connected in series, and apparatus that carries out such method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5849996B2 (ja) * 1980-03-13 1983-11-08 株式会社東芝 直列点灯回路の断芯検出装置
FR2490349A1 (fr) * 1980-09-17 1982-03-19 Aerospatiale Dispositif pour la verification automatique d'une pluralite de voyants electriques
IT1211687B (it) * 1987-07-29 1989-11-03 Vitroselenia S P A In El Ingeg Sistema di rilevamento dei guasti sui circuiti d'illuminazione con alimentazione in serie, particolarmente idoneo per aeroporti
EP0364577B1 (de) * 1988-03-25 1995-01-04 The Nippon Signal Co. Ltd. Anordnung zum ausschaltnachweis von birnen
EP0768810A1 (de) * 1995-10-09 1997-04-16 Adb-Alnaco, Inc. Erdschluss Überwachung und Messanlage für eine Flugplatzbeleuchtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994018811A1 (en) * 1993-02-04 1994-08-18 O.C.E.M. S.P.A. Method for feeding a plurality of discharge or fluorescent lamps connected in series, and apparatus that carries out such method

Also Published As

Publication number Publication date
DK0944295T3 (da) 2004-05-03
PT944295E (pt) 2004-04-30
EP0944295A3 (de) 2000-08-23
ES2213304T3 (es) 2004-08-16
EP0944295A2 (de) 1999-09-22
ITBO980156A1 (it) 1999-09-13
ITBO980156A0 (it) 1998-03-13
ATE257639T1 (de) 2004-01-15
IT1299901B1 (it) 2000-04-04
DE69914008D1 (de) 2004-02-12
DE69914008T2 (de) 2004-11-11

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