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WO2001063976A1 - Systeme d'indication de defaillances de lampes et d'indication d'isolation - Google Patents

Systeme d'indication de defaillances de lampes et d'indication d'isolation Download PDF

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Publication number
WO2001063976A1
WO2001063976A1 PCT/DE2001/000635 DE0100635W WO0163976A1 WO 2001063976 A1 WO2001063976 A1 WO 2001063976A1 DE 0100635 W DE0100635 W DE 0100635W WO 0163976 A1 WO0163976 A1 WO 0163976A1
Authority
WO
WIPO (PCT)
Prior art keywords
series circuit
detection
lamp
control device
voltage signal
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.)
Ceased
Application number
PCT/DE2001/000635
Other languages
German (de)
English (en)
Inventor
Manfred Bete
Wolfgang Klinger
Dieter Leber
Helmut Schmidt
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO2001063976A1 publication Critical patent/WO2001063976A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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

Definitions

  • the present invention relates to a lamp failure alarm system and an insulation alarm system for lighting systems on airfields and the like.
  • Lighting systems include all lighting aids that ensure safe flight operations and taxiing of aircraft in the area of an airport in the dark and / or poor visibility. A distinction is made among other things between approach lights, gliding fire, side row lights, threshold lights, runway lights, runway lights, beacon lights, hazard lights, obstacle lights and rotating lights.
  • airports must be equipped with airfield lighting systems for operation at night or in poor visibility.
  • lighting devices serve as visual navigation aids for the pilot.
  • Lighting systems for large airports include various lighting devices that are used to mark the approach sector, the runways, the runways and aprons. Additional devices are also used, for example taxiway signs, parking aids, wind direction indicators and the like. Both the devices and the systems can be switched separately, and each individual system can also comprise differently switchable lighting devices.
  • the approach lights include, for example, approach flashlights for the optical highlighting of the approach center line and threshold, high-performance lights for approach, threshold and end of the runway, precision approach gel fire for high light outputs and sharp red-white transition and the like.
  • the individual lighting systems usually extend over several kilometers and require a corresponding cable network.
  • the individual lighting devices are usually operated in series in order to rule out differences in intensity of the connected lighting devices at the beginning and end of the line, which were present in parallel-operated lighting devices due to the high voltage drop given these cables.
  • the lamp transformers for feeding the light sources of the lighting devices are connected in series in the series circuit and operated with a constant current. The transformers therefore have the character of current transformers with a fixed, predefinable current conversion ratio.
  • the light intensity of the lighting systems must be able to be adapted at any time to the visual conditions prevailing when the aircraft take off or land.
  • the setting of the light intensity is carried out by means of control and regulating devices, which are provided by the lighting systems in addition to lamps as lighting devices. Once an intensity value has been set, it must be kept constant regardless of mains voltage fluctuations or the failure of individual lamps in the series circuit. Constant current regulators are used to keep the current constant in series circuits of lighting systems on airfields. In addition to the above requirements, international guidelines and
  • lighting systems also include lamp failure detection and / or insulation monitoring devices as lighting devices.
  • Lamp failure detection devices ensure that the failure of lamps in lighting systems can be recognized and remedied. As a rule, regardless of the circuit current and its curve shape, the individual lamp failures in thyristor-controlled series circuits are recognized and reported.
  • the lamp failure detection devices usually used report the first and all other failed lamps of a lighting system.
  • the lamp failure detection devices determine the inductance of the series circuit from a current signal from an idling lamp transformer in the series circuit and a voltage signal from a voltage converter lying parallel to the series circuit.
  • Lamps in the series circuit are usually calibrated using potentiometers. This calibration is an extremely time-consuming and error-prone process, since the accuracy of the notification of failed lamps depends on the goodness of the comparison of the lamp failure detection devices. In addition, when comparing the lamp failure detection devices, care must be taken that the constant current controller of the monitored series circuit and the lamp failure detection device receive the same control signal.
  • the series circuits for airfield lighting which are usually characterized by long cable runs and are mainly located in the ground and in damp shafts, can easily lead to insulation faults in the event of defects due to high operating voltages against earth.
  • the consequence of such insulation faults in the case of double earth faults is the reduction of the operating current and thus the lamp brightness of lighting devices close to the fault, which leads to the failure of the lamps in the event of an emergency.
  • Insulation monitoring devices detect the insulation resistance of an airfield lighting serial circuit both in operation and in the switched-off state.
  • eme Stabilized DC voltage is fed into the series circuit regardless of the operating voltage and the resistance is determined via the resulting current.
  • the measured resistance value specifies an error measure, which outputs a message for initiating remedial measures within predefinable limit values.
  • the various lighting devices such as constant current controllers, lamp failure detection systems and insulation monitoring systems for airfield lighting, must exchange a large number of signals to control and report operating states with the central control device. These signals must be made available to the individual lighting devices on the part of the central control device via cables and corresponding plug or clamp connections. Previously, the lighting devices had to be connected to the central control device or upstream decentralized control devices via parallel interfaces with multi-core cables and corresponding plug or clamp connections. The connection of the individual lighting devices with the control device requires a considerable amount of assembly and material.
  • the present invention is based on the object of providing a lamp failure detection system and an insulation detection system for lighting systems of the type mentioned at the outset, which require simpler wiring and signal supply, entail little assembly and material expenditure, which are simple are more calibratable and moreover enable more precise messages.
  • the present invention uses a lamp alarm system for lighting systems on airfields and the like, consisting of a device for determining the number of failed lamps in a series of lamps and at least one device for detecting at least one current signal and at least one voltage signal of the lamp sensor circuit, the determination device forming the measurement window from the at least one current signal, adding up the at least one voltage signal within this measurement window and transmitting the added voltage signal to a control device.
  • the determination device comprises at least one interface for connection to a control device, at least one interface for connection of a detection device, means for selecting a detection device, means for forming a measurement window from a current signal and means for summing up a voltage signal within the measurement window.
  • Current signals or voltage signals in the sense of the present invention are also signals proportional or convertible to a current signal or a voltage signal, for example power signals, voltage signals, current signals or the like.
  • the interface for connection to a control device is advantageously a bus interface, preferably for a fieldbus, particularly preferably for a PROFIBUS.
  • PROFIBUS is a standardized fieldbus solution with a large number of providers, which provides a digital serial transmission system for automated process control and monitoring.
  • the PROFIBUS allows the transmission of signals from twisted shielded two-wire lines with data transfer rates between 9, ⁇ and 12000 kbit / s and thus allows an extremely simple signal exchange between a control device and the determination device of the lamp failure reporting system.
  • the interface for connection to a control device is designed redundantly. This advantageously allows redundant communication between see the determination device of the lamp failure detection system according to the invention and a control device, which is also advantageously designed to be redundant.
  • the interface for connection to a detection device is advantageously a bus interface. This allows a plurality of detection devices to be connected to a determination device in a simple manner via a bus system.
  • the respective detection device can advantageously be selected on the part of the means for selecting a detection device, the means for selecting a detection device advantageously being provided by a microcontroller.
  • the means for forming a measurement window from a current signal comprise an operational amplifier, whereby a measurement window is formed from the current signal.
  • the means for summing up a voltage signal comprise an analog / digital converter via which the voltage signal is fed to a summing element, the summing element adding up the voltage signal via the measuring window hm formed.
  • the summing element is advantageously designed on the part of a microcontroller.
  • the determination device has means for forming effective values from current or voltage signals, so that effective values can advantageously be transmitted to a control device.
  • the detection device comprises an interface for connection to an detection device, a connection for detecting the voltage of a whole series circuit, a connection conclusion for the detection of the current of an idling lamp transformer and means for activating the detection device on the part of the detection device.
  • connection for detecting the voltage of a lamp circuit advantageously has means for electrical isolation, advantageously a transformer.
  • the means for activating the detection device on the part of the detection device are switchable relays.
  • the detection device has a push-through converter for measuring the series current of a lamp series circuit.
  • the technical solution to the problem with the present invention em insulation detection system for lighting systems on airfields and the like, consisting of a device for determining the insulation resistance of a series circuit cable and at least one device for detecting a current signal of the series circuit, the determination device generating em voltage signal with this applies the series circuit via the detection device and transmits the current and voltage signals to a control device in the event of a predefinable change in the detected current signal over time.
  • a value representing the current or voltage signal is transmitted to the control device, advantageously digitally.
  • the determination device comprises at least one interface for connection to a control device, at least one interface for connection to a detection device, means for generating a voltage signal, means for determining a voltage signal. ner predefinable temporal change in the detected current signal and means for determining at least one current signal and at least one voltage signal.
  • the determination device and / or the detection device have means for filtering current or voltage signals, preferably at least one RC element.
  • the detection device comprises at least one connection for coupling to a series circuit, which is advantageously designed for connecting up to 5 kV eff .
  • the detection device comprises at least one interface for connection to a determination device.
  • the detection device has means for connecting the detection device to a detection device, which are advantageously designed as relays.
  • the interfaces of the determination devices and / or the detection devices are bus interfaces, preferably for a fieldbus, particularly preferably for a PROFIBUS.
  • the interface for connection to a control device is designed redundantly.
  • FIG. 1 shows the basic structure of a combined lamp failure and insulation detection system for airfield lighting systems
  • FIG. 2 shows a combined lamp failure and insulation detection system for airfield lighting systems according to FIG. 1;
  • Figures 1 and 2 show a combined lamp failure and insulation detection system consisting of detection devices 1 and 3, which are serially connected via 24 V inputs / outputs 5 to a control device 6, in this case a SIMATIC S7-300, and detection devices 2 and 4, each create a coupling to a series circuit 7 of a lighting system.
  • the detection devices 1 and 3 of the lamp failure detection systems and the insulation detection systems automatically switch the connected detection devices 2 and 4 and thus record the measured values of the series circuits 7 connected to the detection devices 2 and 4 one after the other.
  • the measurement values are determined by the detection devices 1 and 3 transmitted to the control device 6 in digitally converted form via the connections 5.
  • the control device 6 is connected to a superimposed lighting control system 8, which is arranged centrally in a tower control room of an airport system and controls, regulates and monitors additional lighting devices 9, not shown here, such as constant current controllers and the like.
  • 2 shows the combined lamp failure and insulation detection system according to FIG. 1 in a functional representation.
  • the control device ⁇ connected to the superimposed lighting control system 8 via the PROFIBUS 10 can be controlled and parameterized via the computer marked 11 in FIG. 2, which is used as an input and / or output device.
  • the combined lamp failure and insulation alarm system can be visually displayed on the computer, which in particular makes control, regulation and monitoring tasks more effectively manageable.
  • the combined lamp failure and insulation detection system is a modular system, consisting of the control device 6 for reading and outputting the measured values transmitted by the lamp failure detection systems and the insulation detection systems with respect to the bus connections 10, such as PROFIBUS or Ethernet , and for evaluating the measured values of the lamp failure and insulation detection systems, which each consist of detection devices 1 and 3 and detection devices 2 and 4.
  • FIG. 3 shows a lamp failure detection system consisting of a detection device 1 and a plurality of detection devices 2.
  • the determination device 1 has an interface 12 for connection to a control device ⁇ via corresponding bus lines 5, an interface 13 for connecting detection devices 2 and an interface 14 for selecting a detection device 2.
  • the determination device 1 of the lamp failure reporting system has a microcontroller 15.
  • the determination device 1 comprises means 16 for forming a temporal measurement window from a current signal of a detection device 2 Lamp sensor circuit 7 and means 17 for summing up a voltage signal within this measurement window, the voltage signal being detected by a detection device 2 as the voltage of a lamp series circuit and supplied digitally converted in summing means 17.
  • the summation means 17 are implemented by the microcontroller 15.
  • the microcontroller 15 controls the relay 18 via the interface 14 via a detection device 2, whereby the correspondingly selected detection device 2 is connected to the interface 13 of the determination device 1 via the interface 19 and corresponding connections 20.
  • the detection device 2 selected in this way thus detects, via the interface 21, the primary voltage of the series circuit 7, which is thyristor-controlled with a thyristor controller 22, and a current signal via an idle lamp transformer 23, which generates a time window with the measurement window generating means 16 of the determination device 1, within which the summing means 17 the determination device 1 sums up the analog / digital-converted voltage voltage signal of the lamp series circuit 7 and supplies it to the control device 6 on the part of the microcontroller 15 via the interface 12 and the PROFIBUS connection 5.
  • the control device 6 determines how many lamps in the lamp circuit 7 have failed on the basis of the transmitted accumulated voltage signal. Appropriate measures for eliminating the failed lamps are initiated on the part of the control device 6 or on the part of the superimposed lighting control system 8.
  • the lamp failure system shown in FIG. 3 additionally has, on the part of the detection devices 2, a through-current converter 24 which is connected via the interface 19 to the
  • connection terminal strips 20 and the interface 13 an effective value image 25 (Roote Means Square (RMS)) on the part of the averaging device 1 is supplied, the ascertained effective value of the series current of the lamp series circuit 7 being supplied to the microcontroller 1 of the determination device 1 in an analog / digitally converted manner.
  • the determination device 1 can supply the control device 6 or the superimposed lighting control system 8 with a further measured value from the lamp series circuit 7 for control, regulation or monitoring and serves in 6 to determine the intensity level (regardless of the constant current controller).
  • the rms value of the series current of the lamp series circuit 7 determined in this way is independent of the constant current regulator of the lamp series circuit 7, of which the transformer 26 serving as a current converter is shown in FIG.
  • the lamp failure detection system according to FIG. 3 enables the safe operation of take-off and landing runways and taxiways, for which error-free operation of the lighting is of great importance.
  • the lamp failure detection system ensures that the errors that occur in the lighting devices due to the limited lifetime due to the failure of lamps can be recognized and eliminated immediately after they occur. Lamp failures are recognized and reported by the thyristor-controlled series circuits 7 regardless of the series circuit current and its curve shape. It is irrelevant which constant current regulator make and which constant current regulator type is used.
  • the lamp failure detection system reports the first and all further lamps precisely and precisely.
  • the determination device 1 of the lamp failure detection system switches on the connected detection devices 2 one after the other.
  • the measurement of the current and voltage signals is carried out by connecting the individual detection devices 2 to the determination device 1 via the relays 18 on the part of the detection devices 2. After the relays 18 on the detection device 2 are activated by the Determination device 1 were closed, in the present case three measured values, the secondary voltage of the idling lamp transformer 23 in the series circuit 7, the galvanically isolated primary voltage of the feed transformer 27 of the series circuit 7 and the current in the series circuit 7, are recorded via the through-current transformer 24. These measured values are obtained from the Determination device 1 read.
  • a lamp failure is determined by measuring the voltage time area, while the measurement window t 0 to t n in which the idling lamp transformer 23 is not yet saturated. This measured value obtained is a measure of the inductive component of the impedances of the series circuit 7. If a lamp fails, for example in the event of a filament break, the inductance of the series circuit 7 increases due to the lamp transformer of the defective lamp which then runs empty. With the same type and power of lamp transformers, ie with the same U / I characteristic of the transformers, the increase in inductance is proportional to the number of failed lamps. If the U / I characteristic of the lamp transformers deviate from one another, this results in a measurement error to be taken into account.
  • the determined value of the voltage time area is transmitted to the control device 6.
  • the evaluation is carried out here by interpolations and extrapolations, based on calibration values stored by the control device, so that the number of failed lamps of the lamp series circuit 7 can be determined by the control device 6.
  • the effective value of the series current is determined by the lamp failure system independently of the constant current regulator of the lamp series circuit 7 and transmitted to the control device 6.
  • the control device 6 thus provides an independent measured value of the current for monitoring purposes and the like on the constant current controller of the series circuit 7
  • the current is used to determine the level of the constant current regulator.
  • the calibration is carried out when the series circuit 7 is completely free, i.e. Without lamp failure, the measured current value per stage used by the constant current controller.
  • the detection device 3 of the insulation detection system has an interface 12 via which the detection device 3 can be connected to the control device 6 via a connection 5.
  • the detecting means 3 eme interface 14 to select a detection device 4 by an appropriate control and relay 18 on the part of the detecting devices 4 15 via the pre-to control and selection by the determination means 3 ⁇ provided microcontroller
  • the detector 3 further includes means 28 for generating a Measuring voltage of 500 V DC from the DC voltage of 24 V made available by the interface 12, the measuring voltage generation being activated by switching the relay 29 on the part of the microcontroller 15 of the determining device 3, with the microcontroller first or simultaneously 15 selected detection device 4 is connected to the detection device 3 by switching the relay 18.
  • the selected detection device 4 is connected to the lamp circuit 7. sen and the measuring voltage of about 500 V DC voltage via the connection terminal strips 30 and the selected detection device 4 of the series circuit 7 is applied. On the part of the determination device 3, the voltage U and the insulation fault current of the series circuit 7 are detected via the resistance network by means of the measuring means 31. The voltage and current values detected by the measuring means 31 are then fed to the control device 6 via the interface 12 and the BUS 5 in an analog / digital conversion.
  • the detection devices 4 of the insulation detection system also have a series circuit connection 32 for connection to the series circuit 7, which can supply up to 5 kV ef to the series circuit, furthermore filter means 33 for coarse filtering of the series circuit AC voltage.
  • the filter means 33 are in the form of an RC element consisting of a 2 M ⁇ resistor and a 0.1 ⁇ F capacitor, the values of which can also be dimensioned differently.
  • the secondary circuits 7 usually used in lighting systems are networks without a defined zero potential. Therefore, a first fault, for example a ground fault due to a cable damage, does not lead to a malfunction of the series circuit, which is desirable since errors occurring during flight operation do not impair the function of the lighting system. A further fault, however, leads to the series circuit section lying between the two faults being short-circuited and the lighting devices of the series circuit thus short-circuited, the lamps of the lamp series circuit in the present case, being no longer ready for operation.
  • a first fault for example a ground fault due to a cable damage
  • a further fault leads to the series circuit section lying between the two faults being short-circuited and the lighting devices of the series circuit thus short-circuited, the lamps of the lamp series circuit in the present case, being no longer ready for operation.
  • the insulation signaling system at hand ensures that the first window is detected as early as possible.
  • the insulation state of the series circuit 7 is also important, since experience has shown that high ohmic insulation damage initially develops into low-resistance earth faults.
  • the insulation reporting system shown in FIG. 4 consists of detection devices 4, which are expediently installed in the vicinity of the transformers 27 of the series circuits 7, a determination device 3 and a control device 6, which have a measuring range of 1 k ⁇ to 1000 M ⁇ for calculating the insulation value in ⁇ Software for calculating the insulation value.
  • the measurement is carried out by connecting a detection device 4 to the detection device 3 via the relay 18 on the part of the detection device 4. After the relay 18 has been closed by the detection device 4 by activation by the detection device 3, the measurement voltage generated by the determination device 3 with the voltage generator 28 becomes ramped up to about 500 V DC voltage and the DC current flowing in the series circuit 7 is measured by the measuring means 31 via the detection device 4.
  • the alternating current from the series circuit 7 is filtered out by the detection device 4 with the RC element 33 and by the determination device 3 via the resistance network.
  • the settling of the measuring direct current which is essentially determined by the internal resistance of the measuring circuit (in the present case a series connection of 2.0 M ⁇ and 0.2 M ⁇ ), the insulation resistance R lso and the cable capacitance, is on the part of the 31 monitored on the determination device 3.
  • a predeterminable steady-state value ie when a predefinable temporal change in the detected current signal or the value of the detected value is reached Current signal, the voltage and current values detected by the measuring means 31 are converted analog / digital and transmitted to the control device 6 by the interface 12 of the determination devices 3 via the BUS connection 5.
  • the measuring voltage is reduced from 500 V DC voltage and the relay 18 of the selected detection device 4 is opened. Subsequently, the relay 18 of the next selected detection device 4 is closed and started in accordance with a new measuring cycle for the newly selected detection device 4.
  • each cycle ie. H. each time the detection devices 4 that can be connected to the determination device 3 are scanned, additional measurements are carried out for the comparison, in the present case zero calibration and a measurement without an applied reference resistance on the part of the determination device 3, which in the present case is 10 M ⁇ , but can also have other values.
  • the control device 6 calculates the insulation values of the connected series circuits 7 from the transmitted current and voltage measured values of the zero adjustment and the reference value.
  • the insulation signaling system entails less assembly and material expenditure and thus enables easier wiring and signal supply to the lighting devices.
  • the lamp failure detection system also saves time by automatically calibrating the lamp failure detection system.
  • the radio signals can be transmitted via a higher-level visualization system of the control device 6.
  • functions of the lamp failure detection system are extremely easy and effective to operate, control or monitor.
  • the additional detection of the RMS value of the series circuit current also provides further options for control, regulation or monitoring.
  • the automatic calibration eliminates the need for specialists otherwise required for this.
  • the use of bus systems reduces the installation and material costs and simplifies the wiring and signal supply to the lighting devices.
  • the insulation detection system enables a cost-saving system structure by using determination devices 3 and detection devices 4.
  • the insulation detection system has an extended measuring range from 0 to 1000 M ⁇ , shorter connection times of the series circuits and more precise measurements by using reference resistors.
  • higher-level visualization systems can be used via the control device 6, which further simplify the operation for controlling, regulating or monitoring.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

La présente invention concerne un système d'indication de défaillances de lampes pour installations de balisage d'aéroports ou analogues, constitués d'un dispositif (1), servant à la détermination du nombre de lampes défaillantes d'un circuit de lampes montées en série (7), et d'au moins un dispositif (2) pour détecter au moins un signal de courant et au moins un signal de tension du circuit de lampes montées en série (7), le dispositif de détermination (1) formant une fenêtre de mesure à partir du signal de courant ou des signaux de courant, et, à l'intérieur de cette fenêtre de mesure, totalisant le signal de tension ou les signaux de tension et transmettant le signal de tension totalisé à un dispositif de commande (6). L'invention concerne en outre un système d'indication d'isolation pour installations de balisage d'aéroports ou analogues, constitué d'un dispositif (3) servant à déterminer la résistance d'isolation d'un câble de circuit de courant en série et d'au moins un dispositif (4) servant à la détection d'un signal de courant du circuit en série (7), ce dispositif de détermination (3) produisant un signal de tension qu'il envoie au circuit en série (7), par l'intermédiaire du dispositif de détection (4), et, lors d'une modification temporelle prédéterminable du signal de courant détecté, transmettant le signal de courant et le signal de tension à un dispositif de commande (6).
PCT/DE2001/000635 2000-02-21 2001-02-20 Systeme d'indication de defaillances de lampes et d'indication d'isolation Ceased WO2001063976A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10007893 2000-02-21
DE10007893.1 2000-02-21

Publications (1)

Publication Number Publication Date
WO2001063976A1 true WO2001063976A1 (fr) 2001-08-30

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7023217B1 (en) 2004-12-16 2006-04-04 Honeywell International Inc. Method and apparatus for determining wear of resistive and conductive elements
EP1942707A1 (fr) * 2007-01-04 2008-07-09 Applied Materials, Inc. Détecteur de panne de lampe
CN104994635A (zh) * 2015-06-29 2015-10-21 芜湖倍思科创园有限公司 一种智能室内灯
EP3923684A1 (fr) * 2020-06-11 2021-12-15 Ellego Powertec OY Procédé permettant de déterminer l'emplacement d'un défaut de circuit ouvert dans un circuit électrique et circuit électrique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829735A (en) * 1972-01-28 1974-08-13 Plessey Handel Investment Ag Airfield lighting circuit arrangements
US4323841A (en) * 1979-04-04 1982-04-06 Christian Gundorph Albertus Indicating device for use in airfield lighting plants technical field
JPH10294185A (ja) * 1997-04-17 1998-11-04 Koito Ind Ltd 定電流光度調整装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829735A (en) * 1972-01-28 1974-08-13 Plessey Handel Investment Ag Airfield lighting circuit arrangements
US4323841A (en) * 1979-04-04 1982-04-06 Christian Gundorph Albertus Indicating device for use in airfield lighting plants technical field
JPH10294185A (ja) * 1997-04-17 1998-11-04 Koito Ind Ltd 定電流光度調整装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 02 26 February 1999 (1999-02-26) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7023217B1 (en) 2004-12-16 2006-04-04 Honeywell International Inc. Method and apparatus for determining wear of resistive and conductive elements
EP1942707A1 (fr) * 2007-01-04 2008-07-09 Applied Materials, Inc. Détecteur de panne de lampe
US7923933B2 (en) 2007-01-04 2011-04-12 Applied Materials, Inc. Lamp failure detector
US8106591B2 (en) 2007-01-04 2012-01-31 Applied Materials, Inc. Lamp failure detector
CN104994635A (zh) * 2015-06-29 2015-10-21 芜湖倍思科创园有限公司 一种智能室内灯
EP3923684A1 (fr) * 2020-06-11 2021-12-15 Ellego Powertec OY Procédé permettant de déterminer l'emplacement d'un défaut de circuit ouvert dans un circuit électrique et circuit électrique

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