EP0239807B1 - Système capacitif de protection contre l'intrusion - Google Patents

Système capacitif de protection contre l'intrusion Download PDF

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Publication number
EP0239807B1
EP0239807B1 EP87102947A EP87102947A EP0239807B1 EP 0239807 B1 EP0239807 B1 EP 0239807B1 EP 87102947 A EP87102947 A EP 87102947A EP 87102947 A EP87102947 A EP 87102947A EP 0239807 B1 EP0239807 B1 EP 0239807B1
Authority
EP
European Patent Office
Prior art keywords
current
measuring
cable
electrode
winding
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 - Lifetime
Application number
EP87102947A
Other languages
German (de)
English (en)
Other versions
EP0239807A1 (fr
Inventor
Uwe Metzner
Peer Dr. Ing. Thilo
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
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Priority to AT87102947T priority Critical patent/ATE62766T1/de
Publication of EP0239807A1 publication Critical patent/EP0239807A1/fr
Application granted granted Critical
Publication of EP0239807B1 publication Critical patent/EP0239807B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit

Definitions

  • the invention relates to a capacitive intrusion protection system according to the preamble of claim 1.
  • the electrodes are connected to the evaluation device via cables, generally coaxial cables.
  • the capacities or changes in capacitance between the transmitting and receiving electrodes and / or also between the transmitting electrodes and the earth (earth potential) are measured and alarm criteria for an alarm are derived therefrom.
  • the currents flowing over the electrode capacitance are measured and evaluated. For example, such a method is described in DE-A-33 29 554. There, the electrode currents are measured to measure the capacitive state changes on a protective fence in each electrode circuit with the aid of current measuring devices, and the respective operating capacity of the electrode is obtained therefrom.
  • EP-A-131 738 has therefore already proposed a measuring arrangement for capacitance measurement in which the disruptive influences caused by the cable capacitances are avoided.
  • additional and return lines are provided for each electrode, which are connected to the electrode via additional transmitters.
  • the object of the invention is therefore to avoid the disadvantages described above and for a capacitive intrusion protection system a measuring arrangement for measuring the transmission currents in the electrode circuit to be specified in which the cable capacities have no disruptive influence on the measurement result. Neither expensive special cables nor complex circuit arrangements should be used.
  • a current measuring device is arranged in the transmission circuit between the transmitter and the coaxial conductor of the connecting line, that a further current measuring device is arranged between the shield conductor of the connecting line and the earth potential, and in that the difference from the measuring current and the cable current flowing through the cable capacitance is formed and the actually determined electrode current is processed further.
  • both currents are measured individually.
  • the cable current is eliminated by the difference formation, so that the electrode current actually flowing over the electrodes is measured and evaluated.
  • the current measured in each case can advantageously be converted with an analog-digital converter and the difference can be formed in a connected microcomputer.
  • a specially designed measuring transducer can be provided as the measuring device for measuring the measuring current flowing in the coaxial conductor and for measuring the cable current via the shield conductor.
  • the primary winding is arranged in the electrode circuit. The current to be measured or the associated current is fed via the secondary winding proportional voltage tapped.
  • an additional, third winding is arranged in the transducer, which is connected on the one hand to the shield conductor of the coaxial connecting line and on the other hand is at ground potential. This additional winding leads the cable current in such a way that it is subtracted from the original measuring current. It is thereby achieved in a simple but advantageous manner that the cable current flowing over the unavoidable cable capacities no longer interferes with the measurement.
  • the primary winding and the additional third winding have the same number of turns, so that the cable current flowing through the third winding flows counter to the actual measuring current and is subtracted in this way. The current actually flowing to earth via the electrode capacity is therefore measured on the secondary winding.
  • a measuring transducer MW with its primary winding PW is arranged in the electrode circuit in the evaluation device AWE.
  • the transducer is connected to the transmitter SEN, which for example generates an AC voltage US of 100 volts.
  • the second terminal of the transmitter is at ground potential EP.
  • the measuring current IM which is measured via the secondary winding SW of the measuring transducer MW, flows into the coaxial conductor KL of the connecting line VL, for example in the form of a proportional voltage there can be tapped.
  • the measured current IM consists of the sum of the electrode current IE flowing via the electrode E and the electrode capacitance CE to the earth point EP and the cable current IK flowing via the cable capacitance CK to the screen Sch of the coaxial cable or earth potential EP.
  • the measured current value is falsified depending on the cable capacity CK.
  • a first measuring device MIM is arranged in the electrode circuit, ie between the transmitter SEN and the coaxial conductor KL of the connecting line VL.
  • the shield conductor Sch of the coaxial connecting line VL is not directly grounded, but leads to the evaluation device AWE.
  • the shield conductor Sch is connected to a further measuring device MIK, which is connected to earth potential EP with its second connection.
  • the cable current IK is subtracted from the measurement current IM via a subtraction device located in the evaluation device, so that the electrode current IE actually flowing through the electrode E and electrode capacitance CE is measured.
  • FIG. 3 A simple exemplary embodiment of the arrangement according to the invention is shown in FIG. 3.
  • the measuring device ME is formed by a measuring transducer MW which, in addition to the known primary winding PW in the electrode circuit and the secondary winding SW, has a third winding W3 for tapping the measuring current IM. 2
  • this third winding W3 is connected to the shield conductor Sch of the coaxial connecting line VL, via which the cable current IK caused by the cable capacitance CK flows.
  • the other end of the third winding W3 is at ground potential EP.
  • the number of turns of the primary winding PW and the third additional winding W3 are of equal size, so that the additional winding W3 is flowed through in the opposite direction and the interfering cable current IK is subtracted from the measuring current IM, so that the electrode current IE actually to be measured is determined.
  • the arrangement according to the invention is used in a capacitive intrusion protection system for a plurality of electrodes which are fed by a transmitter and in which the electrode currents are measured in order to determine the electrode capacities.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Burglar Alarm Systems (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Claims (3)

  1. Système capacitif de protection contre une intrusion, dans lequel les courants circulant dans la capacité d'électrodes en direction de la terre sont évalués et dans lequel les électrodes (E) sont reliées par l'intermédiaire de cbles coaxiaux de liaison (VL) à un dispositif d'évaluation (AWE), dans lequel les courants respectifs (IE) des électrodes sont mesurés au moyen de dispositifs de mesure (ME) installés dans les câbles de liaison (VL),
    et dans lequel un dispositif ampèremétrique (MIM) est disposé dans le circuit d'émission entre l'émetteur (SEN) et le conducteur central (KL) du câble coaxial de liaison (VL), et dans lequel l'autre côté de l'émetteur (SEN) constituant une source de tension est relié à la terre (EP),
    caractérisé par le fait
    qu'un autre dispositif ampèremétrique (MIK) est disposé entre le conducteur de blindage (Sch) du câble de liaison (VL) et le potentiel de terre (EP), et
    qu'on forme la différence entre le courant de mesure (IM) et le courant (IH) du câble, produit par la capacité (CK) de ce câble, et qu'on traite ensuite le courant (IE) des électrodes, effectivement déterminé.
  2. Système capacitif de protection contre une intrusion suivant la revendication 1, caractérisé par le fait qu'on numérise et on traite ensuite dans un micro-ordinateur le courant de mesure et le courant du câble (IM et IK) respectivement mesurés.
  3. Système capacitif de protection contre une intrusion suivant la revendication 1, caractérisé par le fait que les dispositifs ampèremétriques (MIM, MIK) sont formés par un transformateur de mesure (MW), qui comporte, en plus de l'enroulement primaire (PW), qui est situé dans le circuit d'émission, et de l'enroulement secondaire (SW), dans lequel est prélevé le courant de mesure (IM), un troisième enroulement (W3), qui est situé entre le conducteur de blindage (Sch) du câble de liaison (VL) et le potentiel de terre (EP), l'enroulement primaire (PW) et le troisième enroulement (W3) possédant les mêmes nombres de spires et étant parcourus par des courants de sens opposés.
EP87102947A 1986-03-04 1987-03-02 Système capacitif de protection contre l'intrusion Expired - Lifetime EP0239807B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87102947T ATE62766T1 (de) 1986-03-04 1987-03-02 Kapazitives intrusionsschutzsystem.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3607017 1986-03-04
DE3607017 1986-03-04

Publications (2)

Publication Number Publication Date
EP0239807A1 EP0239807A1 (fr) 1987-10-07
EP0239807B1 true EP0239807B1 (fr) 1991-04-17

Family

ID=6295448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87102947A Expired - Lifetime EP0239807B1 (fr) 1986-03-04 1987-03-02 Système capacitif de protection contre l'intrusion

Country Status (3)

Country Link
EP (1) EP0239807B1 (fr)
AT (1) ATE62766T1 (fr)
DE (1) DE3769348D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5432459A (en) * 1992-03-17 1995-07-11 Conmed Corporation Leakage capacitance compensating current sensor for current supplied to medical device loads with unconnected reference conductor
AU671902B2 (en) * 1993-06-01 1996-09-12 Conmed Corporation Current sensor for medical devices with continuity monitor
FR3107286B1 (fr) * 2020-02-13 2022-04-01 Univ Reims Champagne Ardenne Procédé de détection de la modification de l’environnement d’un câble

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1104868B (de) * 1959-03-06 1961-04-13 Telefonbau Elektrische Raumschutzanlage
US4293852A (en) * 1978-12-08 1981-10-06 Lawrence Security Services Ltd. Capacitive article removal alarm
DE3321471A1 (de) * 1983-06-14 1984-12-20 Siemens AG, 1000 Berlin und 8000 München Messanordnung zur bestimmung der eigenteilkapazitaet bzw. deren aenderung an einen kapazitiven schutzzaun
DE3329554A1 (de) * 1983-08-16 1985-03-07 Siemens AG, 1000 Berlin und 8000 München Verfahren und anordnung zur messung von kapazitiven zustandsaenderungen an einem schutzzaun

Also Published As

Publication number Publication date
EP0239807A1 (fr) 1987-10-07
DE3769348D1 (de) 1991-05-23
ATE62766T1 (de) 1991-05-15

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