GB1498015A - Devices for monitoring the operation of electric circuits - Google Patents

Devices for monitoring the operation of electric circuits

Info

Publication number
GB1498015A
GB1498015A GB11200/74A GB1120074A GB1498015A GB 1498015 A GB1498015 A GB 1498015A GB 11200/74 A GB11200/74 A GB 11200/74A GB 1120074 A GB1120074 A GB 1120074A GB 1498015 A GB1498015 A GB 1498015A
Authority
GB
United Kingdom
Prior art keywords
failure
conditions
current
lamp
march
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
Application number
GB11200/74A
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.)
GEC Elliott Traffic Automation Ltd
Original Assignee
GEC Elliott Traffic Automation Ltd
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 GEC Elliott Traffic Automation Ltd filed Critical GEC Elliott Traffic Automation Ltd
Priority to GB11200/74A priority Critical patent/GB1498015A/en
Publication of GB1498015A publication Critical patent/GB1498015A/en
Expired legal-status Critical Current

Links

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

Landscapes

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

Abstract

1498015 Lamp failure indicators GEC-ELLIOTT TRAFFIC AUTOMATION Ltd 13 March 1975 [13 March 1974] 11200/74 Heading G4N In a device for monitoring an AC circuit for differentiating between first and second impedance, conditions, the instantaneous value of the current is gated out at G1 by means of a strobe pulse m arranged to occur at a time in each cycle when the current waveform is substantially different in the first and second conditions. The invention is applicable to detecting failure of tungsten halogen lamps L in a traffic light system. Each lamp L is fed via a step-down transformer T; waveforms b and a of Fig. 2 showing the current respectively in first and second conditions. A strobe pulse d is derived by a monostable m triggered at 90 degrees by a phase shifter P. Circuits G1 ... G3 are arranged to produce a constant current pulse at the time of the strobe m in the event of failure of the respective lamp L. The sum of the pulses across R5 is compared in the differential amplifier C with a constant current from G, the circuit being arranged so that capacitor Q is only charged if the number of failed lamps is greater than a predetermined number which may be O. The voltage across capacitor Q is passed by a driver D to energize a control relay S which switches off power to the traffic light system in the event of such a failure.
GB11200/74A 1975-03-13 1975-03-13 Devices for monitoring the operation of electric circuits Expired GB1498015A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB11200/74A GB1498015A (en) 1975-03-13 1975-03-13 Devices for monitoring the operation of electric circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11200/74A GB1498015A (en) 1975-03-13 1975-03-13 Devices for monitoring the operation of electric circuits

Publications (1)

Publication Number Publication Date
GB1498015A true GB1498015A (en) 1978-01-18

Family

ID=9981852

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11200/74A Expired GB1498015A (en) 1975-03-13 1975-03-13 Devices for monitoring the operation of electric circuits

Country Status (1)

Country Link
GB (1) GB1498015A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2430707A1 (en) * 1978-07-03 1980-02-01 Siemens Ag MONITORING DEVICE FOR LAMP FAILURES IN THE LIGHTING OF AN AVIATION FIELD
CN103337190A (en) * 2013-06-11 2013-10-02 西安费斯达自动化工程有限公司 Intelligent detection and alarming method for failure of traffic light
CN113096365A (en) * 2021-04-06 2021-07-09 成都圣路电器有限公司 Central control lighting system and central control light source fault alarm method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2430707A1 (en) * 1978-07-03 1980-02-01 Siemens Ag MONITORING DEVICE FOR LAMP FAILURES IN THE LIGHTING OF AN AVIATION FIELD
CN103337190A (en) * 2013-06-11 2013-10-02 西安费斯达自动化工程有限公司 Intelligent detection and alarming method for failure of traffic light
CN103337190B (en) * 2013-06-11 2015-02-18 西安费斯达自动化工程有限公司 Intelligent detection and alarming method for failure of traffic light
CN113096365A (en) * 2021-04-06 2021-07-09 成都圣路电器有限公司 Central control lighting system and central control light source fault alarm method

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee