EP0944295A2 - Safety device for lighting systems formed by a plurality of lamps connected in series - Google Patents
Safety device for lighting systems formed by a plurality of lamps connected in series Download PDFInfo
- Publication number
- EP0944295A2 EP0944295A2 EP99104798A EP99104798A EP0944295A2 EP 0944295 A2 EP0944295 A2 EP 0944295A2 EP 99104798 A EP99104798 A EP 99104798A EP 99104798 A EP99104798 A EP 99104798A EP 0944295 A2 EP0944295 A2 EP 0944295A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- mesh
- series
- load
- operative
- safety device
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000009849 deactivation Effects 0.000 claims 1
- 238000004804 winding Methods 0.000 description 5
- 238000002955 isolation Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002547 anomalous effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Images
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.
- 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.
- 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 O 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 100 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)
Abstract
Description
- 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.
- This allows known feeding source to provide the desired current intensity, in relation to the number of the lamps that are installed.
- In case of failure, 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).
- During the short time passing between the system damage, e.g. a lamp failure, and the subsequent intervention of the transition and protection device on the primary mesh, the full tension of the secondary supply winding V2 is applied to the broken lamp terminals (Figure 1a).
- It is possible, after the damaged lamp has been substituted or repaired by specialised operator, to restore, by means of the control unit, the load mesh supply.
- If the damage is not correctly identified and therefore the system continues to go wrong, the full voltage of the secondary supply winding V2 continues to be localized on the terminal points of the system damaged part, which is dangerous to persons present near the damaged lighting system.
- 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.
- In case the damage occurs while the lighting system is not in operation, when the system is turned on, it should bear a start-up transient state during which the transition and protection devices would not be able to operate within the proper time because of the technical-operational characteristics of the discharge lamps.
- Because of this problem, during the time between the set-to-on moment and the intervention of the transition and protection device on the primary mesh, the full supply voltage V2 is still applied to section in which the failure has occurred. This constitutes a very serious danger for people located thereby.
- Therefore, 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.
- 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.
- The above mentioned objects are obtained in accordance with the contents of claims.
- The characteristic features of the present invention will become more fully apparent from the following detailed description of a preferred but not the only embodiment, taken in conjunction with the accompanying drawings, in which:
- Figure 1 is a schematic view of a conventional circuit diagram used for lighting systems;
- Figure 1a is a schematic view of a particular part of this circuit diagram, in a particular operation condition;
- Figures 2, 3 are views of the principle circuit diagram of the proposed safety device, in two particularly significant operation conditions.
- With reference to the above described Figures,
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. - 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. A
current transformer 5, whose primary winding is connected in series with the plurality of lamps 3 (see Figure 1), sends its output signal to the control unit C. - The proposed
safety device 1 is connected in series with thelamps 3, which define a load mesh 3a supplied by the output terminals of the first generator GAC. - An
electric contactor 11, normally closed, and adetection mesh 3b are connected to the output terminals of thesafety 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 secondelectric contactors 12, mechanically connected to each other and normally open, an impedance Z, preferably with high power factor, and acurrent measuring device 90. - 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 secondelectric contactors 12 and the isolationelectric contactor 13, are operated in proper phase relation, by aunique actuator 10, e.g. an electric-mechanical relay operated in turn by the control unit C. - Operation of the proposed
safety device 1 will be described in the following, with particular reference to two most characteristic operation conditions. - When in normal operation conditions for the load mesh 3a, the nominal load current runs through each
lamp 3 and thecurrent transformer 5. - With these, say nominal operation condition, the first
electric contactor 11 and the isolationelectric contactor 13 of thesafety device 1 keep their closed position, while the secondelectric contactors 12 are open (Figure 2). - When the first
electric contactor 11 is closed, a non-operative condition I is established and thesafety device 1 is set off. - At the start moment, many adjustment transient effects occur due to the diverse characteristics of the
lamps 3. In this moment, a possible previous failure could cause the full supply voltage V2 of the load mesh 3a to be applied to the terminals of one lamp 3 (Figure 1a). - 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.
- In case it is desired to test previously the metal continuity of the circuit to prevent such dangerous situations, after maintenance operations or after repairing or after a check operation scheduled according to a monitoring program, before the supply tension is applied, 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. - When the
safety device 1 is active, the load mesh 3a can be connected in series with thedetection mesh 3b by therelay 10, that opens theelectric contactor 11. - Opening of the first
electric contactor 11 determines an operative condition O for thesafety device 1. - At the same time, when the first
electric contactor 11 opens, the secondelectric contactors 12, that are mechanically connected to the first electric contactor, are closed, also due to the action of therelay 10. - In phase relation with the second
electric contactor 12 closing and with the firstelectric contactor 11 opening, the second generator GDC sends a predetermined detection continue current, that runs through the load mesh 3a and thedetection mesh 3b (Figure 3). - If the integrity of the load mesh 3a is ascertained by the measuring means 90, due to the detection current flowing through a closed circuit, the control unit 100 stores this data and, possibly, operates the first switching means 4 to close, so that the
lamps 3 are powered. - Otherwise, the failure is displayed by means of a predetermined sound or optical signal.
- The presence of
such safety device 1 in a lighting system guarantees safe conditions for the people present nearby, with any anomalous operation condition of the system. - 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 asingle 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.
Claims (3)
- Safety device for lighting systems in which a plurality of loads (3) are connected in series along a load mesh (3a), that is supplied by a first generator (GAC) connected to a power supply via first switching means (4), the device being characterised in that it includes:first operative means (11) connected in series with said load mesh (3a) and operated by an actuator (10), the actuator (1) being operated in phase relation with deactivation condition of said switching means (4), with the first operative means (11) being movable between two positions, namely a non-operative position (I), in which they close the load mesh (3a), and an operative position (O), in which the load mesh (3a) is open because of non-integrity of the load mesh (3a) due to the terminals of the operative means (11) being disconnected to each other;a detection mesh (3b) including a second generator (GDC) and derived from the terminals of said operative means (11) when they are in the operative position (O);a measuring means (90) for measuring the current flowing through the detection mesh (3b), the measuring means being connected in series with the detection mesh (3b) and with the central unit (C), for detecting the integrity of the circuit formed by the load mesh (3a) and the detection mesh (3b) connected in series with each other.
- Safety device as in claim 1, characterised in that said detection mesh (3b) includes at least one impedance (Z) aimed at limiting the current flowing through the detection mesh (3b), and second operative means (12), that are operated in phase relation with said first operative means (11) by the said actuator (10) due to a command received by the control unit (C), for disconnecting the detection mesh (3b) from the load mesh (3a) when the said first operative means (11) is set to the non-operative position (I).
- Device as in claim 2, characterised in that said first and second operative means (11,12) include electric contactors.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT98BO000156A IT1299901B1 (en) | 1998-03-13 | 1998-03-13 | SAFETY DEVICE FOR LIGHTING SYSTEMS MADE UP OF A PLURALITY OF LOADS CONNECTED IN SERIES. |
ITBO980156 | 1998-03-13 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0944295A2 true EP0944295A2 (en) | 1999-09-22 |
EP0944295A3 EP0944295A3 (en) | 2000-08-23 |
EP0944295B1 EP0944295B1 (en) | 2004-01-07 |
Family
ID=11343027
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99104798A Expired - Lifetime EP0944295B1 (en) | 1998-03-13 | 1999-03-11 | Safety device for lighting systems formed by a plurality of lamps connected in series |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0944295B1 (en) |
AT (1) | ATE257639T1 (en) |
DE (1) | DE69914008T2 (en) |
DK (1) | DK0944295T3 (en) |
ES (1) | ES2213304T3 (en) |
IT (1) | IT1299901B1 (en) |
PT (1) | PT944295E (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5849996B2 (en) * | 1980-03-13 | 1983-11-08 | 株式会社東芝 | Disconnection detection device for series lighting circuits |
FR2490349A1 (en) * | 1980-09-17 | 1982-03-19 | Aerospatiale | DEVICE FOR THE AUTOMATIC VERIFICATION OF A PLURALITY OF ELECTRIC INDICATORS |
EP0271524A1 (en) * | 1986-06-05 | 1988-06-22 | Hughes Aircraft Company | Cable continuity checker |
IT1211687B (en) * | 1987-07-29 | 1989-11-03 | Vitroselenia S P A In El Ingeg | FAULT DETECTION SYSTEM ON LIGHTING CIRCUITS WITH SERIAL POWER SUPPLY, PARTICULARLY SUITABLE FOR AIRPORTS |
WO1989009533A1 (en) * | 1988-03-25 | 1989-10-05 | The Nippon Signal Co., Ltd. | Disconnection detection apparatus for lamps |
IT1266242B1 (en) * | 1993-02-04 | 1996-12-27 | Ocem Spa | METHOD FOR THE POWER SUPPLY OF A PLURALITY OF DISCHARGE OR FLUORESCENT LAMPS CONNECTED IN SERIES AND EQUIPMENT THAT IMPLEMENTS THIS |
EP0768810A1 (en) * | 1995-10-09 | 1997-04-16 | Adb-Alnaco, Inc. | Ground fault detection and measurement system for airfield lighting system |
-
1998
- 1998-03-13 IT IT98BO000156A patent/IT1299901B1/en active IP Right Grant
-
1999
- 1999-03-11 EP EP99104798A patent/EP0944295B1/en not_active Expired - Lifetime
- 1999-03-11 DK DK99104798T patent/DK0944295T3/en active
- 1999-03-11 DE DE69914008T patent/DE69914008T2/en not_active Expired - Lifetime
- 1999-03-11 ES ES99104798T patent/ES2213304T3/en not_active Expired - Lifetime
- 1999-03-11 AT AT99104798T patent/ATE257639T1/en not_active IP Right Cessation
- 1999-03-11 PT PT99104798T patent/PT944295E/en unknown
Non-Patent Citations (1)
Title |
---|
None |
Also Published As
Publication number | Publication date |
---|---|
PT944295E (en) | 2004-04-30 |
DK0944295T3 (en) | 2004-05-03 |
ES2213304T3 (en) | 2004-08-16 |
DE69914008T2 (en) | 2004-11-11 |
IT1299901B1 (en) | 2000-04-04 |
ITBO980156A0 (en) | 1998-03-13 |
ATE257639T1 (en) | 2004-01-15 |
EP0944295A3 (en) | 2000-08-23 |
DE69914008D1 (en) | 2004-02-12 |
EP0944295B1 (en) | 2004-01-07 |
ITBO980156A1 (en) | 1999-09-13 |
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