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Method and apparatus for protecting electrical equipment

Info

Publication number
EP0357343A3
EP0357343A3 EP19890308612 EP89308612A EP0357343A3 EP 0357343 A3 EP0357343 A3 EP 0357343A3 EP 19890308612 EP19890308612 EP 19890308612 EP 89308612 A EP89308612 A EP 89308612A EP 0357343 A3 EP0357343 A3 EP 0357343A3
Authority
EP
Grant status
Application
Patent type
Prior art keywords
signal
level
input
interference
equipment
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.)
Withdrawn
Application number
EP19890308612
Other languages
German (de)
French (fr)
Other versions
EP0357343A2 (en )
Inventor
Gavin William Bourn
Hendrik Jacobus Geldenhuys
Rene Bruno Lagesse
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.)
Council of Scientific and Industrial Research (CSIR)
Original Assignee
Council of Scientific and Industrial Research (CSIR)
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

Links

Classifications

    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18Prevention or correction of operating errors
    • G08B29/185Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system

Abstract

The invention relates to a method of and apparatus for protecting electrical or electronic equipment from electromagnetic interference. Such a method includes the initial steps of detecting the electromagnetic interference, and generating an input signal which represents the interference. The level of the input signal is then compared to a predetermined threshold level, and an output signal is generated to initiate a protective measure, such as interrupting the power supply to the equipment, in the event of the input signal level exceeding the predetermined threshold. The apparatus for protecting the equipment includes detection means (1) for detecting the electromagnetic interference, and generating a representive input signal, level detection means (5) for comparing the input signal level to a threshold level, and control means (6,7) for generating an output signal to initiate a protective measure.
EP19890308612 1988-09-02 1989-08-24 Method and apparatus for protecting electrical equipment Withdrawn EP0357343A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ZA886541 1988-09-02
ZA8806541 1988-09-02

Publications (2)

Publication Number Publication Date
EP0357343A2 true EP0357343A2 (en) 1990-03-07
EP0357343A3 true true EP0357343A3 (en) 1990-12-27

Family

ID=25579401

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890308612 Withdrawn EP0357343A3 (en) 1988-09-02 1989-08-24 Method and apparatus for protecting electrical equipment

Country Status (1)

Country Link
EP (1) EP0357343A3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5166661A (en) * 1991-06-07 1992-11-24 Advance Security Inc. Automobile alarm system with noise reduction function
DE102004029360B4 (en) * 2004-06-17 2007-06-21 Siemens Ag Device with an operation state and an interrupted state
WO2009116849A3 (en) * 2008-03-17 2009-12-23 Pak Chuen Chang Electrical interface protecting apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1030243A (en) * 1963-02-01 1966-05-18 Napier & Son Ltd Means for detecting a fault on an electrical supply system
GB1119941A (en) * 1966-08-19 1968-07-17 George Scott Bowman Protection device
DE1279512B (en) * 1967-06-28 1968-10-03 August Woerl Circuit to prevent false alarms UEberwachungsanlagen with electromagnetic fields or sonic or ultrasonic fields
US4206451A (en) * 1975-11-05 1980-06-03 Honeywell Inc. Intrusion detection system
US4466071A (en) * 1981-09-28 1984-08-14 Texas A&M University System High impedance fault detection apparatus and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1030243A (en) * 1963-02-01 1966-05-18 Napier & Son Ltd Means for detecting a fault on an electrical supply system
GB1119941A (en) * 1966-08-19 1968-07-17 George Scott Bowman Protection device
DE1279512B (en) * 1967-06-28 1968-10-03 August Woerl Circuit to prevent false alarms UEberwachungsanlagen with electromagnetic fields or sonic or ultrasonic fields
US4206451A (en) * 1975-11-05 1980-06-03 Honeywell Inc. Intrusion detection system
US4466071A (en) * 1981-09-28 1984-08-14 Texas A&M University System High impedance fault detection apparatus and method

Also Published As

Publication number Publication date Type
EP0357343A2 (en) 1990-03-07 application

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RIN1 Inventor (correction)

Inventor name: LAGESSE, RENE BRUNO

Inventor name: BOURN, GAVIN WILLIAM

Inventor name: GELDENHUYS, HENDRIK JACOBUS

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Effective date: 19910628