GB1286301A - Improvements in or relating to electric circuits - Google Patents

Improvements in or relating to electric circuits

Info

Publication number
GB1286301A
GB1286301A GB3870/69A GB387069A GB1286301A GB 1286301 A GB1286301 A GB 1286301A GB 3870/69 A GB3870/69 A GB 3870/69A GB 387069 A GB387069 A GB 387069A GB 1286301 A GB1286301 A GB 1286301A
Authority
GB
United Kingdom
Prior art keywords
input
signal
amplifier
alarm
fed
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
GB3870/69A
Inventor
Peter Arthur Roe
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries 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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB3870/69A priority Critical patent/GB1286301A/en
Publication of GB1286301A publication Critical patent/GB1286301A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C17/00—Monitoring; Testing ; Maintaining
    • G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C9/00—Emergency protection arrangements structurally associated with the reactor, e.g. safety valves provided with pressure equalisation devices
    • G21C9/02—Means for effecting very rapid reduction of the reactivity factor under fault conditions, e.g. reactor fuse; Control elements having arrangements activated in an emergency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

1286301 Alarm circuit ASSOCIATED ELECTRICAL INDUSTRIES Ltd 23 April 1970 [23 Jan 1969] 3870/69 Heading G4N An electric circuit for use with an alarm system detects when a signal exceeds a predetermined value or when the rate of change of signal is excessive. The difference between the signal and the predetermined value is amplified by a chopper amplifier, part of the output being fed back to provide the chopping signal. The input to the alarm circuit at 1, may be a thermocouple in a nuclear reactor. The input is combined with a fixed voltage from 2 and fed to a chopper circuit 3 which feeds amplifier 4. The signal from amplifier 4-3 rectified at 6 and fed to sampling circuit 9 in which a sample value of the input is stored and compared with the current input to indicate changes in the input. The difference signal between the stored value of the input and the current input is fed from differential amplifier 15 to the chopper circuit 3. Other outputs are supplied via differential amplifiers 16 and 17, and OR gate 21, to alarms 22. Thus if the rate of change of input exceeds a certain predetermined value, set by the sample interval and the amplitude of pulses from pulse generator 11, an alarm signal is produced. If the input exceeds a certain preset value produced by voltage divider 2, which gives a voltage opposing the signal voltage, an alarm signal is again produced via rectifier 6 differential amplifier 10 and OR gates 21. If the predetermined value is exceeded a signal is passed via power amplifier 7 and rectifier 8 to activate an input to control the unwanted condition. The sampling circuit 9 comprises field effect transistor 23 whose control electrode is fed from the sample pulse generator. The input is used to charge up capacitor 24 during the sample period, the charge being retained on capacitor 24 when transistor 23 is switched off. The stored potential carried on capacitor 24 together with the output of oscillator 11 is compared with the input via field effect transistors 26 and 27, transistors 32 and 33 and differential amplifiers 15, 16 and 17. If the output of oscillator 11 is biased by the output of rectifier 6 so that no change in polarity occurs, the amplifier 15 does not have a square wave output and the input signal 3 not chopped. This causes an alarm condition to be registered i.e. if the input changes by a value greater than the amplitude of the square wave from oscillator 11 between sample periods an alarm condition is produced.
GB3870/69A 1969-01-23 1969-01-23 Improvements in or relating to electric circuits Expired GB1286301A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3870/69A GB1286301A (en) 1969-01-23 1969-01-23 Improvements in or relating to electric circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3870/69A GB1286301A (en) 1969-01-23 1969-01-23 Improvements in or relating to electric circuits

Publications (1)

Publication Number Publication Date
GB1286301A true GB1286301A (en) 1972-08-23

Family

ID=9766446

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3870/69A Expired GB1286301A (en) 1969-01-23 1969-01-23 Improvements in or relating to electric circuits

Country Status (1)

Country Link
GB (1) GB1286301A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2453013A1 (en) * 1974-11-08 1976-05-13 Hellige Gmbh Device for monitoring body temperature of patient - automatically shows rapid alterations in temperature which pass given threshold

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2453013A1 (en) * 1974-11-08 1976-05-13 Hellige Gmbh Device for monitoring body temperature of patient - automatically shows rapid alterations in temperature which pass given threshold

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees