GB1100647A - Improvements in or relating to high voltage circuit protection arrangements - Google Patents

Improvements in or relating to high voltage circuit protection arrangements

Info

Publication number
GB1100647A
GB1100647A GB1731265A GB1731265A GB1100647A GB 1100647 A GB1100647 A GB 1100647A GB 1731265 A GB1731265 A GB 1731265A GB 1731265 A GB1731265 A GB 1731265A GB 1100647 A GB1100647 A GB 1100647A
Authority
GB
United Kingdom
Prior art keywords
output
circuit
gate
pulse
detector
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
GB1731265A
Inventor
Boleslaw Marian Sosin
Roger Edwin John Gerard
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co 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 Marconi Co Ltd filed Critical Marconi Co Ltd
Priority to GB1731265A priority Critical patent/GB1100647A/en
Publication of GB1100647A publication Critical patent/GB1100647A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
    • H02H1/0069—Details of emergency protective circuit arrangements concerning transmission of signals by means of light or heat rays

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

1,100,647. Protective arrangements. MARCONI CO. Ltd. 29 Dec., 1965 [23 April, 1965], No. 17312/65. Heading H2K. [Also in Division G1] The fact that overload conditions are occurring in a high voltage line, is transmitted over a radiation link to alarm or safety apparatus, the radiation transmitter being fed by a pulse generator having an operating characteristic dependent on the line condition. In the line to be protected there is inserted a series resistance, the voltage drop across which controls the mark-space ratio of a blocking oscillator T. The oscillator output may be amplified and is applied to an infra-red source, e.g. a GaAs diode, the pulsed output from which is received at a low voltage station by a photo diode detector 10. The detector output is amplified and applied to a Schmidt trigger circuit 12 which passes only pulses above a predetermined amplitude, shaping those that are passed. Connected to the trigger circuit output is a timing circuit 13 (a one-shot multivibrator) and an AND gate 14. The timing circuit is triggered by the trailing edges of pulses from the Schmidt trigger. Under normal line conditions the transmitted pulses representing this condition are sufficiently spaced apart that a timing circuit pulse ends before the next pulse from trigger 12 (Fig. 2, not shown). However, if a voltage overload occurs, the mark-space ratio of the pulse generator rises substantially and a pulse from the Schmidt trigger coincides with a timing circuit pulse, producing an output from the AND gate to actuate the alarm. The device is also provided with a fail safe circuit connected to another output of the Schmidt trigger and providing one input to an OR gate 15, the other input of which is from the AND gate 14. An output from either the AND gate or the fail safe circuit is passed on to a resettable bistable circuit 17 which operates the alarm and/or safety means when over-load occurs. The fail safe circuit comprises a detector 16 and inverting amplifier 20 and gives an output when no pulses are obtained from the detector 10.
GB1731265A 1965-04-23 1965-04-23 Improvements in or relating to high voltage circuit protection arrangements Expired GB1100647A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1731265A GB1100647A (en) 1965-04-23 1965-04-23 Improvements in or relating to high voltage circuit protection arrangements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1731265A GB1100647A (en) 1965-04-23 1965-04-23 Improvements in or relating to high voltage circuit protection arrangements

Publications (1)

Publication Number Publication Date
GB1100647A true GB1100647A (en) 1968-01-24

Family

ID=10092973

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1731265A Expired GB1100647A (en) 1965-04-23 1965-04-23 Improvements in or relating to high voltage circuit protection arrangements

Country Status (1)

Country Link
GB (1) GB1100647A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2131239A (en) * 1982-09-10 1984-06-13 Matsushita Electric Works Ltd Current detecting device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2131239A (en) * 1982-09-10 1984-06-13 Matsushita Electric Works Ltd Current detecting device

Similar Documents

Publication Publication Date Title
GB1462913A (en) Dual spectrum infrared fire detection system with high energy ammunition round discrimination
US4135161A (en) Method and means for pulse detection
GB1248300A (en) Thunderstorm warning system
DK149726B (en) SMOKE DETECTOR WITH IMPULSE EVALUATION CIRCUIT
GB1100647A (en) Improvements in or relating to high voltage circuit protection arrangements
EP0375120A1 (en) Nuclear event detectors
DE1791192A1 (en) Device for the detection of unauthorized entry to protect a limited surveillance area
GB1181564A (en) Self-Clocking Record Sensing System.
US3524984A (en) Nuclear explosion detection systems
US3069624A (en) Automatic power trip switch for a transmitter having high reflective power
GB1106805A (en) Electronic protection apparatus
US2727143A (en) Means for minmizing pulse reflections in linear delay lines loaded with a nonlinear load
GB1558471A (en) Fire detectors
GB1185270A (en) An Electrical Protection Circuit having a Preselected Current Time Characteristic
US3685587A (en) Light responsive activating apparatus for fire or explosion suppressing systems
GB998337A (en) Improvements in or relating to phase measuring circuits
SU1695518A1 (en) Device for protection against impulse noise
KATADA et al. Stilpnomelane co-existing with biotite in a Ryôke metamorphic rock
GB1137876A (en) High voltage d.c. transmission systems with protection means
NESTERUK et al. Contrast reception of a random-phase pulsed signal with correlated noise(Random-phase pulsed signal detection by contrast reception techniques against background of normal correlated noise)
BEARD Status report on latest developments in clear air turbulence(Clear air turbulence detection and prediction by laser, radiometer, radar and other devices)
SIMOVSKAIA et al. Distribution function for the product of envelopes of a mixture of Gaussian noise with a pulse signal in the case of N stored pulses(Distribution function for probability density of random process at output of multiplier acted upon by envelopes consisting of Gaussian noise and pulse signal)
FR1454342A (en) Safety device acting in the event of an overload, usable in particular on plow bodies
KOONS Proton precipitation by a whistler-mode wave from a VLF transmitter[Interim Report]
GOSTEV Determination of the transfer functions of pulsed systems having a first-order link with both periodic and step-varying parameters(Transfer function of pulse amplitude modulated sampled data control systems with element generating arbitrarily shaped pulses and first order element series connected with constant parameter elements)