EP0256484A1 - Clôture capacitive de sécurité - Google Patents

Clôture capacitive de sécurité Download PDF

Info

Publication number
EP0256484A1
EP0256484A1 EP87111577A EP87111577A EP0256484A1 EP 0256484 A1 EP0256484 A1 EP 0256484A1 EP 87111577 A EP87111577 A EP 87111577A EP 87111577 A EP87111577 A EP 87111577A EP 0256484 A1 EP0256484 A1 EP 0256484A1
Authority
EP
European Patent Office
Prior art keywords
voltage
insulator
electrode
amplifier
compensation
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Withdrawn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
EP87111577A
Other languages
German (de)
English (en)
Inventor
Uwe Ing. 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
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Publication of EP0256484A1 publication Critical patent/EP0256484A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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 protective fence with transmitting and receiving electrodes, which are arranged by means of insulators on the protective fence on grounded fence poles, the electrode currents flowing through the electrode capacitances being measured and an intruder alarm being derived in a central evaluation device from determined changes in capacitance.
  • transmitting and receiving electrodes are required, which are attached in an insulated manner.
  • the currents flowing through the electrode capacitances are measured and evaluated, as described, for example, in DE-OS 33 29 554. Capacity changes caused by intruders are derived from the measured electrode currents or determined operating capacities, which lead to an alarm. However, the electrode currents are falsified by currents flowing over the insulators.
  • the transmitter electrodes are particularly critical here, since they have a high voltage (e.g. 100 V) across the insulator and therefore relatively large insulator currents can flow, even if the insulator still has a fairly large resistance.
  • the object of the invention is therefore to avoid the disadvantages described above and to reduce the disturbing influences on the insulators in the case of a capacitive protective fence described in the introduction, in order to measure the electrode currents more precisely and to be able to detect the changes in capacitance more reliably.
  • each isolator for the transmitting electrodes is designed as an active isolator with a voltage compensation device which supplies the isolator with a compensation voltage, so that the isolator current is largely compensated for.
  • the active isolator according to the invention uses, in addition to a conventional (passive) isolator, a compensation device which measures the voltage across the isolation gap and supplies the isolator with a compensation voltage, so that only a negligibly small isolator current can flow.
  • a compensation device which measures the voltage across the isolation gap and supplies the isolator with a compensation voltage, so that only a negligibly small isolator current can flow.
  • the active isolator expediently consists of a simple isolator, to which a voltage amplifier is assigned. This feeds in an increased voltage at a conductive potential surface suitably arranged on the insulator.
  • the conductive potential surface which can be formed, for example, by a guard ring, has a potential tap which separates the insulator into a compensation path which is between the tap and the electrode connection, and a partial path which is between the tap and the base point of the insulator located on.
  • the electrode voltage tapped off at the electrode connection of the insulator and fed to the amplifier is fed from the amplifier output as compensation voltage to the potential tap, and is thus fed into the insulator.
  • Fig. 1 shows schematically the operation of the invention.
  • the transmitter electrode EL is isolated from the earth E by the insulator J. Between the electrode EL and the earth E there is the voltage UL, which in the case of a real insulator causes a disturbing insulator current IJ to flow through the insulator J.
  • the amplifier V is connected at its input to the connection point of the insulator J for the transmission electrode EL and at its output A to the potential tap PA of the potential area P arranged on the insulator J.
  • the potential area P divides the insulator J or its entire insulation section into a compensation section KS and a section TS.
  • the amplifier V generates the compensation voltage UK, which is fed in via the tap PA on the isolator.
  • an additional current IP now flows from the amplifier V via the potential area P to the earth E.
  • this current IP does not interfere as long as the amplifier V is able to supply this potential current IP without UK differing significantly from UL .
  • the operational amplifier OP serves as amplifier here, which is supplied from two identical batteries with a positive (BP) or negative (BN) voltage to earth at the connection terminals of the operational amplifier.
  • the energy supply for the amplifier can either be provided by primary elements, for example lithium batteries, solar cells with additional accumulators, or by coupling to the electrode voltage.
  • the electrode voltage UL is fed to the input E1 of the operational amplifier OP via the voltage divider from C1 and C2, while the resistor R sets the operating point of the operational amplifier.
  • the winding W1 of the transformer U is connected to the output A of the operational amplifier OP.
  • the second winding W2 of the transformer U is connected to the potential area P and the potential tap PA of the insulator J.
  • the base points of the amplifier V and the transformer U are connected to earth E.
  • the effect described in Figure 1 is achieved in that the capacitors C1 and C2, the windings W1 and W2 and the gain v of the operational amplifier OP are selected in such a way that the compensation voltage UK is equal to the electrode voltage UL.
  • the advantage of this compensation circuit is that the voltages UL and UK can be large compared to the supply voltage BP, BN of the operational amplifier OP.
  • FIG. 3 shows a modification of the voltage compensation circuit compared to FIG. 2.
  • the function is similar to that described in Fig. 2. However, all parts connected to the base point of the winding W1 are not connected to earth E but to the potential area P or PA. In addition, the capacitor C2 is omitted.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
EP87111577A 1986-08-13 1987-08-10 Clôture capacitive de sécurité Withdrawn EP0256484A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3627400 1986-08-13
DE3627400 1986-08-13

Publications (1)

Publication Number Publication Date
EP0256484A1 true EP0256484A1 (fr) 1988-02-24

Family

ID=6307273

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111577A Withdrawn EP0256484A1 (fr) 1986-08-13 1987-08-10 Clôture capacitive de sécurité

Country Status (1)

Country Link
EP (1) EP0256484A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB846018A (en) * 1956-07-13 1960-08-24 Monroe Calculating Machine Detection system
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB846018A (en) * 1956-07-13 1960-08-24 Monroe Calculating Machine Detection system
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

Similar Documents

Publication Publication Date Title
EP3867651B1 (fr) Dispositif de mesure, installation électrique comprenant un dispositif de mesure et procédé de mesure d'un courant de fuite
EP3776612B1 (fr) Batterie de condensateurs
DE2627199A1 (de) Schutzeinrichtung fuer ein teilnehmergeraet
DE112007001098T5 (de) Datensignal-Isolationsvorrichtung
DE3304316A1 (de) Mess- und daempfungswiderstandsanordnung fuer ein hochspannungsgeraet
EP0256484A1 (fr) Clôture capacitive de sécurité
EP0190547B1 (fr) Dispositif détecteur de surveillance et de comptage pour un déchargeur sans éclateur à étincelles
DE2709230A1 (de) Speisebruecke
EP4312032B1 (fr) Dispositif de mesure pour courants alternatifs et haute tension des plasmas physiques
EP0106247B1 (fr) Installation téléphonique
DE19536782C2 (de) Schaltungsanordnung für ein Strommeßrelais
EP0239807B1 (fr) Système capacitif de protection contre l'intrusion
EP0009811B1 (fr) Amplificateur de ligne avec montage pour la protection grossière de l'entrée et de la sortie contre les surtensions
DE69615901T2 (de) Differentialschutz
EP0193989A2 (fr) Circuit limiteur de surtension pour un réseau à large bande
DE2811696A1 (de) Elektronischer koppelpunkt zum durchschalten von fernsprech- oder datensignalen in einer symmetrischen verteil- und koppelanordnung
DE4331184C2 (de) Auswerteschaltung
EP0037940A1 (fr) Circuit pour branchement à deux fils d'un abonné téléphonique à une ligne pour des signaux sortants et une ligne pour des signaux entrants
EP0256482A1 (fr) Clôture capacitive de sécurité
EP0259627A2 (fr) Arrangement d'isolateurs pour une clôture capacitive de protection
EP1035323B1 (fr) Dispositif pour la saisie de signaux pour un circuit d'allumage
DE3111021C1 (de) Schutzeinrichtung gegen elektrostatische Aufladungen für schutzisolierte elektrische Geräte
EP0867660A1 (fr) Dispositif de surveillance d'un brûleur
DE2638727C2 (de) Kondensatoranordnung
DE4444345A1 (de) Sicherheitsbarriere für hohe Datenraten

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19880809

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19900301

RIN1 Information on inventor provided before grant (corrected)

Inventor name: THILO, PEER, DR. ING.

Inventor name: METZNER, UWE, ING.