EP0259627A2 - Arrangement d'isolateurs pour une clôture capacitive de protection - Google Patents

Arrangement d'isolateurs pour une clôture capacitive de protection Download PDF

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Publication number
EP0259627A2
EP0259627A2 EP87111566A EP87111566A EP0259627A2 EP 0259627 A2 EP0259627 A2 EP 0259627A2 EP 87111566 A EP87111566 A EP 87111566A EP 87111566 A EP87111566 A EP 87111566A EP 0259627 A2 EP0259627 A2 EP 0259627A2
Authority
EP
European Patent Office
Prior art keywords
insulator
partial
insulators
transmitter
electrode
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Withdrawn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
EP87111566A
Other languages
German (de)
English (en)
Other versions
EP0259627A3 (fr
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
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
Publication of EP0259627A2 publication Critical patent/EP0259627A2/fr
Publication of EP0259627A3 publication Critical patent/EP0259627A3/fr
Withdrawn legal-status Critical Current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 an arrangement of insulators on a capacitive protective fence, which has a plurality of transmitting electrodes acted upon by a transmitter and a plurality of receiving electrodes, which are fastened to the protective fence by means of insulators, and also has an evaluation device in which the flowing and measured through the electrode capacitances Currents are processed and evaluated, with a current measuring device being arranged between the transmitter and the transmitting electrode in each transmission circuit.
  • transmitting and receiving electrodes are required, which are attached to the protective fence or to the fence poles by means of insulators.
  • the currents flowing through the electrode capacitance 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.
  • the electrode currents are falsified by currents flowing over the insulators.
  • the transmitter electrodes are particularly critical here, since they have a high voltage (eg 100 V) at the insulator and can therefore close relatively large insulation currents, even if the insulator has a rather large resistance.
  • each insulator for the transmitting electrodes is formed by at least two partial insulators with a common connecting part, to which the transmitter is connected directly and at least one transmitting circuit via the second partial insulator, the base point of the first Partial insulator is at ground potential.
  • the isolator is formed by two partial isolators, at the common connecting part of which the transmitter is direct, i.e. without a measuring device, and if the second partial insulator is connected to the transmitting circuit with the transmitting electrode and the measuring device, the disturbing current flowing through the first partial insulator is guided past the measuring device and can therefore not be measured.
  • the current flowing through the first partial insulator does not interfere with the evaluation and can therefore be very large.
  • only the second partial insulator has to withstand the voltage drop across the current measuring device, which, as is known, can be kept very small.
  • the arrangement with the transmission voltage applied directly to the support has the advantage that only the measuring current of one electrode is adversely affected by the insulation current, while all other measuring currents remain unaffected. For an exact measurement and evaluation with this arrangement, it is therefore only necessary to dispense with the measurement of a transmitter electrode.
  • a transmitter SEN with the transmission voltage US which is on the one hand at ground potential EP, feeds a transmission electrode SE via a measuring device MW.
  • the electrode current IE flows from this transmitting electrode SE to the earth point EP via the electrode capacitance CE.
  • the transmission electrode SE is generally attached to the grounded fence pole by a plurality of insulators J, so that an insulator current IJ flows through the respective insulator J.
  • the measuring device is formed, for example, by a measuring transducer MW, so that the primary winding PW is located in the transmitting circuit and the measuring signal proportional to the measuring current IM is tapped and further processed via the secondary winding SW.
  • This measuring current IM is composed of the electrode current IE and the insulator current IJ.
  • the measuring transformer MW therefore measures a measuring current IM as the sum of the current IE through the electrode capacitance CE and the current J through the insulator J.
  • the circuits are closed via the earth points or earth potentials symbolically represented here.
  • a capacitive protective fence usually has a plurality of transmitter electrodes SE1, SE2,. In the arrangement according to the invention, this can be done with the aid of a cheap, shielded cable of lower quality, so that this additional effort is of no greater importance than the use of very expensive special insulators.
  • FIG. 3 An advantageous embodiment of the invention is shown in Figure 3, in which the desired improvement is achieved without an additional cable.
  • the transmitter electrodes here for example four transmitter electrodes SE1 to S4, are connected to the transmitter SEN via a respective measuring device MW1 to MW4. Only the primary winding of the respective transducer MW1 to MW4 is shown here.
  • the respective measuring current IM1 to IM4 is measured.
  • the arrangement according to the invention now provides an insulator which consists of a high-quality part insulator J1h with an electrically conductive support ST and further part insulators J2 to J4 connected to it.
  • the electrically conductive support ST is arranged on the high-quality (first) partial insulator J1h as a load-bearing element.
  • the capacitance current IE1 through the electrode capacitance CE1 of the transmitting electrode SE1 is not relevant due to excessive interference.
  • the transmitting electrode SE1 which is galvanically connected to the support ST, at the bottom, that is to say near the ground.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
EP87111566A 1986-08-13 1987-08-10 Arrangement d'isolateurs pour une clôture capacitive de protection Withdrawn EP0259627A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3627473 1986-08-13
DE3627473 1986-08-13

Publications (2)

Publication Number Publication Date
EP0259627A2 true EP0259627A2 (fr) 1988-03-16
EP0259627A3 EP0259627A3 (fr) 1989-10-18

Family

ID=6307307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111566A Withdrawn EP0259627A3 (fr) 1986-08-13 1987-08-10 Arrangement d'isolateurs pour une clôture capacitive de protection

Country Status (1)

Country Link
EP (1) EP0259627A3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3814063A1 (de) * 1988-04-26 1989-11-09 Siemens Ag Isolatoranordnung an einem kapazitiven intrusions-schutzzaun
DE3814062A1 (de) * 1988-04-26 1989-11-09 Siemens Ag Isolatoranordnung an einem kapazitiven schutzzaun

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB892872A (en) * 1960-09-12 1962-04-04 American District Telegraph Co Intruder alarm systems
DE8307308U1 (de) * 1983-03-14 1983-08-04 Siemens AG, 1000 Berlin und 8000 München Isolator mit einer Drahtspannvorrichtung für kapazitive Schutzzäune

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB892872A (en) * 1960-09-12 1962-04-04 American District Telegraph Co Intruder alarm systems
DE8307308U1 (de) * 1983-03-14 1983-08-04 Siemens AG, 1000 Berlin und 8000 München Isolator mit einer Drahtspannvorrichtung für kapazitive Schutzzäune

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3814063A1 (de) * 1988-04-26 1989-11-09 Siemens Ag Isolatoranordnung an einem kapazitiven intrusions-schutzzaun
DE3814062A1 (de) * 1988-04-26 1989-11-09 Siemens Ag Isolatoranordnung an einem kapazitiven schutzzaun

Also Published As

Publication number Publication date
EP0259627A3 (fr) 1989-10-18

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Inventor name: METZNER, UWE, ING.

Inventor name: THILO, PEER, DR.-ING.