WO2006061693A1 - A method for detecting an open circuit such as public lighting system - Google Patents

A method for detecting an open circuit such as public lighting system Download PDF

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Publication number
WO2006061693A1
WO2006061693A1 PCT/IB2005/003689 IB2005003689W WO2006061693A1 WO 2006061693 A1 WO2006061693 A1 WO 2006061693A1 IB 2005003689 W IB2005003689 W IB 2005003689W WO 2006061693 A1 WO2006061693 A1 WO 2006061693A1
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WO
WIPO (PCT)
Prior art keywords
electric
auxiliary device
control signal
load
loads
Prior art date
Application number
PCT/IB2005/003689
Other languages
French (fr)
Inventor
Giovanni Cannistra'
Original Assignee
O.C.E.M. S.P.A.
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 O.C.E.M. S.P.A. filed Critical O.C.E.M. S.P.A.
Publication of WO2006061693A1 publication Critical patent/WO2006061693A1/en

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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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/23—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in series
    • H05B47/235—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in series with communication between the lamps and a central unit
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/44—Testing lamps

Definitions

  • the present invention relates to the technical field concerning the operation state of electric equipments including e.g. a network mesh formed by loads connected in series, with particular reference to the public 1ighting systems.
  • lamps are used in lighting field, low or high pressure lamps, mercury-vapor lamps, incandescent lamps, halides lamps and so on, in which the emitted luminous flux depends on the intensity of the electric current passing therein.
  • outside or public lighting systems require, e.g. a cascade connection of the corresponding electric loads, with the circulation of the same current in each load, to allow as uniform as possible lighting of the environment, or roadway.
  • each lamp supplied by a relative current transformer requires the installation of auxiliary devices, which communicate the lamp good operation state to a control central unit, situated in the supply apparatus.
  • Such devices not only integrate more additional functions, but also, in case of short circuit condition, control e.g. a branch set in parallel connection to the lamp, in order to avoid dangerous overvoltage at the lamp ends in case of breakdown.
  • Each auxiliary device communicates with the central unit by e.g. so-called power-line carrier, which allow to use the same power line as a vehicle for the information signals transmission.
  • the central unit uses the supply line and the so-called "polling" technique to examine individually each device, which communicates the operation state of the associated lamp.
  • the object of the present invention is to propose a method for detecting an open circuit, which allows to detect quickly the interruption of an electric circuit formed by loads connected in series or in branched from a supply line.
  • Figure 1 is an electric diagram of a circuit formed by loads connected in series and powered by a supply and control apparatus;
  • Figure 2 is an electric diagram of the circuit of Figure 1, in which a failure occurred in a portion included between two generic loads;
  • Figure 3 is an electric diagram of a circuit formed by loads parallel to an electric line and powered by a supply and control apparatus, according to an embodiment
  • Figure 4 is an electric diagram of the circuit of Figure 3, in which a failure occurred in a conductor of a portion included between two generic loads .
  • the reference number 1 indicates a supply and control apparatus, aimed at supplying an electric circuit L, formed by a plurality of electrical loads Ci,..., Ci, Ci + i, Ci +2 , .., Cj, Cj +1 , .., C n , which in the example shown in Figure 1 are connected in series.
  • each electric load Ci includes, e.g. a current transformer, which has its primary winding connected in series with the electric circuit L and its secondary winding connected for supplying a load element, for example a lamp, and an auxiliary device Di, which includes a power supply and a trans-receiver.
  • the supply and control apparatus can also communicate, over the same electric- circuit L and e.g. by a power line carrier, with the auxiliary devices Di, .. , Di, Di + i, D 1+2 , .. , Dj, Dj +1 , .. , D n in the way explained hereinbelow.
  • the description of the method refers to e.g.
  • the method proposed by the present method includes : the transmission, on the electric line and by a power line carrier, of at least one first control signal S(i,i+1) from a first auxiliary device D 1 , connected to a first load Ci, to a second auxiliary device Di +1 , connected to a second electric load Ci +1 ; the transmission, on the electric line and by a power line carrier, of at least one second control signal S(i+l,i) from the second auxiliary device Di + i / to the first auxiliary device D 1 ; - the receiving of the first control signal S(i,i+1) by the second auxiliary device Di +1 ; the transmission of a first error signal Err(i+l, (i)) to the supply and control apparatus, by the second auxiliary device D i+ i, aimed at defining the missing
  • each auxiliary device for example, the second device Di +1 , connected to the second load Ci +1 , communicates with the auxiliary devices D i+2 and Di of the adjacent loads, e.g. according to periodical times.
  • the lack of signals determines the transmission of a respective second and first error signal Err(i, (i+1)) and Err(i+1, (i) ) , by means of the power line carrier, from the second and first auxiliary device Di +1 , Di to the supply and control apparatus, in order to detect the portion of the circuit, in which the fault has occurred.
  • the interruption of the circuit L in the portion Ll causes the interruption of the imposed current, not shown in the Figures, which supplies the above mentioned plurality of electric loads.
  • the electric loads besides the first and second electric load Ci, Ci + i, isolated one from the other due to the failure, continue to transmit the control signals in the above described way, due to the power supplied thereto by the power source integrated in each auxiliary device.
  • these signals include an identifying code, which distinguishes them from the others, thus allowing their recognition by the auxiliary devices receiving them.
  • the first control signal S(i,i+1) is recognized, received and possibly processed by the auxiliary devices of the loads adjacent to the first electric load Ci, due to identifying code, while it is ignored by all other auxiliary devices.
  • the error signals can be transmitted by means of radio waves from the above mentioned auxiliary devices, in the example D i+ i, Di, to the supply and control apparatus.
  • the above described method allows to detect a failure in the circuit L, which causes its interruption, also when only one of the above mentioned first control signal S(i,i+1) and second control signal S(i+l,i) is transmitted between two generic auxiliary devices, e.g. between the first and second devices Di, Di +1 .
  • the missing receiving of the first signal S(i,i+1) will operate the second auxiliary device D 1+ i so as to generate a first error signal Err(i+1, (i) ) , directed to the supply and control apparatus; in this way, it is likewise possible to detect a possible interruption of the portion of the circuit Ll, included between the first load Ci and the second load Ci +1 .
  • the supply and control apparatus includes electric loads, connected to the ends of the electric line, of which only the connected auxiliary devices D 0 and D n+ i have been indicated for sake of simplicity, added to the above mentioned plurality of electric loads Ci,..., Ci, Ci + i, Ci +2 , .., Cj, Cj + i, .., C n , since the control and error signals are managed in the similar way as the one described above: in this way, it is possible to detect the interruption of the metallic continuity in any portion of the electric circuit L.
  • the above mentioned electric loads Ci,..., Ci, C i+ i, C 1+2 , .., Cj, Cj +i , .. , C n are branched from the electric circuit L, powered by the supply and control apparatus 1, as shown in Figure 3.
  • the control and error signals are managed in the similar way as in the previously described case, in which the electric loads are connected in series.
  • first and second control signals S(i,i+1), S(i+l,i), transmitted respectively from the first and second auxiliary devices D 1 , D i+ i can be sent indifferently on a specific electric conductor of the line L, as shown in Figure 3, or they can be send in sequence on both the conductors of the line L.
  • the supply and control apparatus 1 includes only one electric load, of which the only auxiliary device D 0 has been shown, branched from the beginning of the electric line L and belonging to the above mentioned plurality of electric loads Ci,..., Ci, C i+ i, Ci +2 , .., Cj, Cj + i, .. , C n , since the error and control signal are managed in the same way, as described above.
  • the advantage of the present invention lies in the fact that it has defined a method for finding an open circuit, which, in case of an interruption of an electric circuit composed by loads connected in cascade, or branched from a supply line, allows to find the portion of the circuit, in which the failure has occurred.
  • the detection of the faulty portion allows the specialized staff to intervene and to remove the portions of the cable relative to the faulty portion of the circuit from the tubular sheath and to introduce therein an intact portion of the feeding cable.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Selective Calling Equipment (AREA)

Abstract

A method for detecting an interrupted circuit, with the circuit being of the type including a plurality of electric loads connected to an electric line (L) and powered by a supply and control apparatus (1), each electric load including a using element and an auxiliary device, arranged in parallel, includes: the transmission, on the electric line, of at least one first control signal (S(i,i+1)) from a first auxiliary device (Di), connected to a corresponding first load (Ci), belonging to a plurality of electric loads, to a second auxiliary device (D i+1), connected to a corresponding second electric load (C i+l), adjacent to the first load (C1), belonging to the plurality of electric loads; the receiving of the first control signal (S(i,i+l)), transmitted by the first auxiliary device (Di), by the second auxiliary device (D i+1); the transmission of a first error signal (Err (i+1,(i))) to the supply and control apparatus (1), by the second auxiliary device (D i+1), which indicates the lack of the first control signal (S(i,i+l)) directed to the second device (D i+1).

Description

A METHOD FOR DETECTING AN OPEN CIRCUIT SUCH AS A PUBLIC LIGHTING SYSTEM
FIELD OF THE INVENTION
The present invention relates to the technical field concerning the operation state of electric equipments including e.g. a network mesh formed by loads connected in series, with particular reference to the public 1ighting systems.
DESCRIPTION OF PRIOR ART
Different types of lamps are used in lighting field, low or high pressure lamps, mercury-vapor lamps, incandescent lamps, halides lamps and so on, in which the emitted luminous flux depends on the intensity of the electric current passing therein.
Consequently, outside or public lighting systems require, e.g. a cascade connection of the corresponding electric loads, with the circulation of the same current in each load, to allow as uniform as possible lighting of the environment, or roadway.
In particular, the public illumination systems have generally a remarkable extension, and thus, each lamp supplied by a relative current transformer requires the installation of auxiliary devices, which communicate the lamp good operation state to a control central unit, situated in the supply apparatus.
Such devices not only integrate more additional functions, but also, in case of short circuit condition, control e.g. a branch set in parallel connection to the lamp, in order to avoid dangerous overvoltage at the lamp ends in case of breakdown.
Each auxiliary device communicates with the central unit by e.g. so-called power-line carrier, which allow to use the same power line as a vehicle for the information signals transmission.
In this way, the central unit uses the supply line and the so-called "polling" technique to examine individually each device, which communicates the operation state of the associated lamp.
Thus, it is possible to know, with a delay depending on the number of loads of the system, when and which lamp is out of use, thus allowing its substitution. If the system failure causes a circuit interruption, e.g. due to cables cutting, the above mentioned polling technique does not allow to detect where the exact breakdown point is.
Similar considerations are valid for the lighting systems with loads set in parallel to a supply line.
SUMMARY OF THE INVENTION
The object of the present invention is to propose a method for detecting an open circuit, which allows to detect quickly the interruption of an electric circuit formed by loads connected in series or in branched from a supply line.
The above mentioned object is obtained in accordance with the contents of the claims. BRIKF DESCRIPTION OF THK FIGURES
The characteristic features of the invention, which do not appear from what has been just said, will be better pointed out in the following, in accordance with the contents of the claims and with reference to the enclosed figures, in which:
Figure 1 is an electric diagram of a circuit formed by loads connected in series and powered by a supply and control apparatus; - Figure 2 is an electric diagram of the circuit of Figure 1, in which a failure occurred in a portion included between two generic loads;
Figure 3 is an electric diagram of a circuit formed by loads parallel to an electric line and powered by a supply and control apparatus, according to an embodiment;
Figure 4 is an electric diagram of the circuit of Figure 3, in which a failure occurred in a conductor of a portion included between two generic loads .
DESCRIPTION OF PRKFERRKD EMBODIMENTS
Having regards to the enclosed Figures, the reference number 1 indicates a supply and control apparatus, aimed at supplying an electric circuit L, formed by a plurality of electrical loads Ci,..., Ci, Ci+i, Ci+2, .., Cj, Cj+1, .., Cn, which in the example shown in Figure 1 are connected in series.
With reference to Figure 1, each electric load Ci includes, e.g. a current transformer, which has its primary winding connected in series with the electric circuit L and its secondary winding connected for supplying a load element, for example a lamp, and an auxiliary device Di, which includes a power supply and a trans-receiver. Besides supplying the electric loads, the supply and control apparatus can also communicate, over the same electric- circuit L and e.g. by a power line carrier, with the auxiliary devices Di, .. , Di, Di+i, D1+2, .. , Dj, Dj+1, .. , Dn in the way explained hereinbelow. The description of the method refers to e.g. any two adjacent electric loads Ci and Ci+1, later called respectively first and second electric load Ci, Ci+i, like the elements defining them and the signals generated thereby, for a bigger explanation clarity. The method proposed by the present method includes : the transmission, on the electric line and by a power line carrier, of at least one first control signal S(i,i+1) from a first auxiliary device D1, connected to a first load Ci, to a second auxiliary device Di+1, connected to a second electric load Ci+1; the transmission, on the electric line and by a power line carrier, of at least one second control signal S(i+l,i) from the second auxiliary device Di+i/ to the first auxiliary device D1; - the receiving of the first control signal S(i,i+1) by the second auxiliary device Di+1; the transmission of a first error signal Err(i+l, (i)) to the supply and control apparatus, by the second auxiliary device Di+i, aimed at defining the missing receiving of the first control signal S(i,i+1) by the second device Di+1; the transmission of a second error signal Err(i, (i+1) ) , to the supply and control apparatus, by the first device D1, aimed at defining the missing receiving of the second control signal S(i+l,i) by the first auxiliary device Di.
It becomes obvious from the above described method, that each auxiliary device, for example, the second device Di+1, connected to the second load Ci+1, communicates with the auxiliary devices Di+2 and Di of the adjacent loads, e.g. according to periodical times.
As shown as example in Figure 2, a possible failure of the portion of the circuit Ll included between the first electric load Ci and the second electric load Ci+1, which causes the interruption of the circuit L, does not allow the receiving of the first and second control signals S(i,i+1), S(i+l,i), respectively by the second and first auxiliary device Di+1, D1.
The lack of signals determines the transmission of a respective second and first error signal Err(i, (i+1)) and Err(i+1, (i) ) , by means of the power line carrier, from the second and first auxiliary device Di+1, Di to the supply and control apparatus, in order to detect the portion of the circuit, in which the fault has occurred.
According to the above described example, the interruption of the circuit L in the portion Ll, causes the interruption of the imposed current, not shown in the Figures, which supplies the above mentioned plurality of electric loads.
The electric loads, besides the first and second electric load Ci, Ci+i, isolated one from the other due to the failure, continue to transmit the control signals in the above described way, due to the power supplied thereto by the power source integrated in each auxiliary device.
Moreover, these signals include an identifying code, which distinguishes them from the others, thus allowing their recognition by the auxiliary devices receiving them.
For example, the first control signal S(i,i+1) is recognized, received and possibly processed by the auxiliary devices of the loads adjacent to the first electric load Ci, due to identifying code, while it is ignored by all other auxiliary devices.
Otherwise, the error signals, can be transmitted by means of radio waves from the above mentioned auxiliary devices, in the example Di+i, Di, to the supply and control apparatus.
The above described method allows to detect a failure in the circuit L, which causes its interruption, also when only one of the above mentioned first control signal S(i,i+1) and second control signal S(i+l,i) is transmitted between two generic auxiliary devices, e.g. between the first and second devices Di, Di+1.
If we take for example only the transmission of the first signal S(i,i+1) from the first auxiliary device Di, connected to the first load Ci, to the second device Di+1, connected to the second load Ci+i, adjacent to the first one, the missing receiving of the first signal S(i,i+1) will operate the second auxiliary device D1+i so as to generate a first error signal Err(i+1, (i) ) , directed to the supply and control apparatus; in this way, it is likewise possible to detect a possible interruption of the portion of the circuit Ll, included between the first load Ci and the second load Ci+1. The supply and control apparatus includes electric loads, connected to the ends of the electric line, of which only the connected auxiliary devices D0 and Dn+i have been indicated for sake of simplicity, added to the above mentioned plurality of electric loads Ci,..., Ci, Ci+i, Ci+2, .., Cj, Cj+i, .., Cn, since the control and error signals are managed in the similar way as the one described above: in this way, it is possible to detect the interruption of the metallic continuity in any portion of the electric circuit L.
According to an embodiment, the above mentioned electric loads Ci,..., Ci, Ci+i, C1+2, .., Cj, Cj+i, .. , Cn, are branched from the electric circuit L, powered by the supply and control apparatus 1, as shown in Figure 3. The control and error signals are managed in the similar way as in the previously described case, in which the electric loads are connected in series.
In particular, the first and second control signals S(i,i+1), S(i+l,i), transmitted respectively from the first and second auxiliary devices D1, Di+i, can be sent indifferently on a specific electric conductor of the line L, as shown in Figure 3, or they can be send in sequence on both the conductors of the line L.
In this case, the supply and control apparatus 1 includes only one electric load, of which the only auxiliary device D0 has been shown, branched from the beginning of the electric line L and belonging to the above mentioned plurality of electric loads Ci,..., Ci, Ci+i, Ci+2, .., Cj, Cj+i, .. , Cn, since the error and control signal are managed in the same way, as described above.
A possible failure on the electric line L, causing its interruption, has been shown in Figure 4: in this case, as discussed before, the first load Ci and the second load Ci+i do not receive the relative control signals and they transmit an error signal to the supply and control apparatus 1 by the power line carrier or by radio waves. The advantage of the present invention lies in the fact that it has defined a method for finding an open circuit, which, in case of an interruption of an electric circuit composed by loads connected in cascade, or branched from a supply line, allows to find the portion of the circuit, in which the failure has occurred.
The detection of the faulty portion allows the specialized staff to intervene and to remove the portions of the cable relative to the faulty portion of the circuit from the tubular sheath and to introduce therein an intact portion of the feeding cable.
It is understood that the proposed invention has been described as a mere, not limiting example. Therefore, it is obvious that any practical or use variants applied thereto remain within the protective scope of the invention as described above and claimed below.

Claims

CLAXMS
1. Method for detecting an interrupted circuit, the circuit being of the type including a plurality of electric loads connected to an electric line (L) and powered by a supply and control apparatus (1) , each electric load including a load element and an auxiliary device, arranged in parallel, characterized in that it includes: - the transmission, on said electric line, of at least one first control signal (S(i,i+D) from a first auxiliary device (Di) , connected to a corresponding first load (Ci) , belonging to said plurality of electric loads, to a second auxiliary device (D1+1), connected to a corresponding second electric load (Ci+i) , adjacent to said first load (Ci) , belonging to said plurality of electric loads; the receiving of said first control signal (S(i/i+l))ι transmitted by said first auxiliary device (Di) , by the second auxiliary device (Di+i) ; the transmission of a first error signal (Err(i+1, (i) ) ) to said supply and control apparatus (1) , by said second auxiliary device (Di+1) , indicating the lack of the first control signal (S(i,i+D) directed to said second device (Di+i) .
2. Method for detecting and interrupted circuit, the circuit being of the type including a plurality of electric loads connected to an electric line (L) and powered by a supply and control apparatus (1) , each electric load including a load element and an auxiliary device, arranged in parallel, characterized in that it includes: the transmission, on said electric line, of at least one first control signal (S(i,i+1)) from a first auxiliary device (D1) , connected to a corresponding first load (Ci) , belonging to said plurality of electric loads, to a second auxiliary device (Di+1) , connected to a corresponding second electric load
(Ci+i) , adjacent to said first load (Ci) , belonging to said plurality of electric loads,- the transmission, on said electric line (L) , of at least one second control signal (S(i+l,i)) from said second auxiliary device (Di+1) , connected to said corresponding second load (Ci+i) belonging to said plurality of electric loads, to said first auxiliary device (D1) , connected to said corresponding first load (Ci) , adjacent to said second load (Ci+i) , belonging to said plurality of electric loads,- the receiving of said first control signal (S(i,i+1)), transmitted by said first auxiliary device (Di) . by said second auxiliary device (Di+1) ; the receiving of said second control signal (S(i+l,i)), transmitted by said second auxiliary device (Di+1) . by said first auxiliary device (Di) ; - the transmission of a first error signal Err(i+l, (i)) to said supply and control apparatus (1) , by said second auxiliary device (Di+1) , indicating the lack of said first control signal (S(i,i+D) directed to said second device (Di+1),- - the transmission of a second error signal (Err(i, (i+1) ) ) , to said supply and control apparatus (1) , by said first auxiliary device (Di), which defines the missing receiving of the second control signal (S(i+l,i)) by said first auxiliary device (D1) .
3. Method, as claimed in claim 1, in which said plurality of electric" loads is connected in series on said electric line (L) , characterized in that said first control signal (S(i,i+1) is sent to the supply conductor of said electric line (L) .
4. Method, as claimed in claim 2, in which said plurality of electric loads is connected in series on said electric line (L) , characterized in that said first control signal (S(i,i+1) and second control signal (S(i+l,i)) are sent to the supply conductor of said electric line (L) .
5. Method, as claimed in claim 1, in which said plurality of electric loads is branched from said electric line (L) , characterized in that said first control signal (S(i,i+1) is sent to at least on of the two supply conductors of said electric line (L) .
6. Method, as claimed in claim 1, in which said plurality of electric loads is branched from said electric line (L) , characterized in that said first control signal (S(i,i+1) is sent in sequence to one and the other of the two supply conductors of said electric line (L) .
7. Method, as claimed in claim 2, in which said plurality of electric loads is branched from said electric line (L) , characterized in that said first control signal (S(i,i+1) and second control signal (S(i+l,i)) are sent to at least one of the two supply conductor of said electric line (L) .
8. Method, as claimed in claim 2, in which said plurality of electric loads is branched from said electric line (L) , characterized in that said first control signal (S(i,i+1) and second control signal (S(i+l,i)) are sent in sequence to one and the other of the two supply conductors of said electric line (L) .
9. Method, as claimed in claim 1, characterized in that said first error signal (Err(i+1 (i) ) ) is transmitted on said electric line (L) .
10. Method, as claimed in claim 1, characterized in that said first error signal (Err(i+1(i) ) ) is transmitted by radio waves.
11. Method, as claimed in claim 2, characterized in that said first error signal (Err(i+1 (i) ) ) and second error signal (Err(i, (i+1))) are transmitted on said electric line (L) .
12. Method, as claimed in claim 2, characterized in that said first error signal (Err(i+1(i) ) ) and second error signal (Err(i, (i+1) ) ) are transmitted by radio waves.
13. Method, as claimed in claim 3 or 4, characterized in that the electric loads of said plurality of electric loads, connected to the ends of said electric line (L) are integral with said supply and control apparatus (1) .
14. Method, as claimed in claim 5, or 6, or 7, or 8, characterized in that the electric load of said plurality of electric loads, connected to the beginning of said electric line (L) is integral with said supply and control apparatus (1) .
PCT/IB2005/003689 2004-12-07 2005-12-07 A method for detecting an open circuit such as public lighting system WO2006061693A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO2004A000756 2004-12-07
IT000756A ITBO20040756A1 (en) 2004-12-07 2004-12-07 METHOD FOR DETECTING OPEN CIRCUIT

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10317441B2 (en) 2013-10-14 2019-06-11 Signify Holding B.V. Problem detection for cable-fed-loads

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5373453A (en) * 1990-02-06 1994-12-13 Bae; Hee H. Centralized apparatus for displaying disordered locations of lighting fixtures and method of collecting information of the disorders
US20020009975A1 (en) * 2000-06-07 2002-01-24 Janusz Gerald E. Method and system for transmitting, receiving and collecting information related to a plurality of working components
US20020103621A1 (en) * 1997-04-16 2002-08-01 A.L. Air Data, Inc. Lamp monitoring and control system and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5373453A (en) * 1990-02-06 1994-12-13 Bae; Hee H. Centralized apparatus for displaying disordered locations of lighting fixtures and method of collecting information of the disorders
US20020103621A1 (en) * 1997-04-16 2002-08-01 A.L. Air Data, Inc. Lamp monitoring and control system and method
US20020009975A1 (en) * 2000-06-07 2002-01-24 Janusz Gerald E. Method and system for transmitting, receiving and collecting information related to a plurality of working components

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10317441B2 (en) 2013-10-14 2019-06-11 Signify Holding B.V. Problem detection for cable-fed-loads

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