WO2012146433A2 - Procédé et dispositif pour la détection de fils - Google Patents

Procédé et dispositif pour la détection de fils Download PDF

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Publication number
WO2012146433A2
WO2012146433A2 PCT/EP2012/054101 EP2012054101W WO2012146433A2 WO 2012146433 A2 WO2012146433 A2 WO 2012146433A2 EP 2012054101 W EP2012054101 W EP 2012054101W WO 2012146433 A2 WO2012146433 A2 WO 2012146433A2
Authority
WO
WIPO (PCT)
Prior art keywords
conductor
offset
magnetic field
detecting
finding
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.)
Ceased
Application number
PCT/EP2012/054101
Other languages
German (de)
English (en)
Other versions
WO2012146433A3 (fr
Inventor
Tobias Zibold
Andrej Albrecht
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2012146433A2 publication Critical patent/WO2012146433A2/fr
Publication of WO2012146433A3 publication Critical patent/WO2012146433A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices

Definitions

  • the invention relates to a technique for finding an AC-carrying conductor.
  • the invention relates to a technique for finding an AC-carrying conductor based on a time offset of components of a complex vector.
  • Line finders which operate on the basis of an electrical, capacitive or magnetic field.
  • Each of the three measurement principles has its individual strengths for detecting a piece of metal, a live conductor or other metallic obstruction hidden in, for example, a house wall to be found, for example to avoid damaging the obstruction when drilling a hole in the house wall .
  • Wire seekers are also known which combine several of the measuring principles mentioned, for example in order to achieve an improved resolution or a clearer measurement.
  • the invention has for its object to provide a technique for further improved finding an alternating voltage-carrying conductor.
  • the invention solves the problem by means of a method having the features of
  • the method according to the invention enables a better detection of lines which are at usual voltages of, for example, 110V / 220V / 380V, or also low-voltage lines.
  • the essence of the invention is to measure the magnetic field representing a complex vector corresponding to the complex current through the line and to relate it to the measured electric field defining the real axis. If you consciously let a complex current flow through the lines to be detected, with a known angle to the real axis (E-field), then this stream can be distinguished from other streams and thus the line from other lines.
  • An inventive method for finding an AC-carrying conductor comprises steps of detecting an electric field at a first measurement location, detecting a magnetic field at the first measurement location, determining a time offset between the detected fields, comparing the determined time offset with a reference offset and outputting an indication of the conductor depending on the comparison.
  • the time offset may be equivalently expressed as absolute time or as phase angle with respect to an alternating frequency of the electric or magnetic field.
  • the temporal offset always means the image of the phase angle between the electric and magnetic fields.
  • the alternating voltage-carrying conductor both on the basis of the determined time offset and to identify it under a plurality of conductors in the region of the measuring location.
  • the reference offset the reference to the conductor, for example, be given if the offset indicates an open line, that is, on a line through which no active current flows.
  • a time offset associated with a particular AC line conductor may be known. Corresponds to the specific temporal "
  • a time offset between the detected fields at a known frequency can also be compared with a reference value. This allows the guide to be generated based on the same information without formally determining the phase.
  • the temporal reference offset may be determined in at least two different ways.
  • an electric field is detected at a second measuring location in the region of the conductor, a magnetic field is detected at the second measuring location, and the reference offset is determined on the basis of the fields detected at the second measuring location.
  • the reference offset determined in this way encompasses all potential measurement errors that may influence an otherwise determination of the reference offset. Tracking the conductor or identifying another section of the conductor can thereby be facilitated.
  • a current can be generated by the conductor, which includes the reference offset with the AC voltage at the conductor.
  • the temporal reference offset can be selected so that it differs from a time offset between current and voltage of another conductor. This can help to make a mapping of a site to the area of the leader less vulnerable.
  • the electrical and magnetic fields are detected sequentially. Depending on the measuring method of the electric and the magnetic field mutual interference can thus be avoided. Alternatively, the electric and magnetic fields can also be detected simultaneously. This can make it easier to ensure that the relevant measuring location for the magnetic field is the same measuring location as that for the electric field.
  • the first measurement location along the ac voltage-carrying conductor is shifted on the basis of the hint.
  • the signal indicative of the conductor may be configured to indicate to a user that the measurement site is approaching or approaching the conductor.
  • a course of the conductor can be tracked in a simple and reliable way. This may make it possible, for example, to correct or complete an incomplete or incorrect circuit diagram of an installation.
  • a computer program product comprises program code means for carrying out the method described, when it runs on a processing device or is stored on a computer-readable data carrier.
  • the invention relates to a device for finding an alternating voltage-carrying conductor, wherein the device comprises a first sensor for detecting an electric field at a first measuring location, a second sensor for detecting a magnetic field at the first measuring location, a processing device for determining a time offset between the detected fields and an output device for outputting an indication of the conductor.
  • the processing device can determine the time offset as the absolute time or based on an alternating frequency of the electric or magnetic field as the phase angle.
  • the processing device is configured to control the output device in dependence on a comparison of the determined phase angle with a predetermined time reference offset.
  • the device can be used to find the alternating voltage-carrying line.
  • the device may also be used to identify a particular AC-carrying conductor among a plurality of AC-conducting conductors or to locate different portions of the conductor.
  • an extension of the conductor can also be determined when the conductor is hidden, for example as a conduit extending within a wall of a building.
  • a system for finding an AC-carrying conductor comprises the described device and means for generating a current through the conductor, the current including the AC voltage at the conductor including the reference offset.
  • the device can actively or passively establish the reference offset between current and voltage.
  • the device includes a complex electrical resistance for connection to the conductor. Since the conductor carries an AC voltage, after connecting the complex electrical resistance to the conductor, a complex current flows whose components include the reference offset with each other.
  • the advantages of finding the conductor based on the time lag between current and voltage, or based on the phase angle between electric field and magnetic field can be combined with the advantages of a transceiver system for finding the conductor.
  • the complex electrical resistor comprises an inductance and / or a capacitor.
  • the device can be constructed in this way particularly simple and inexpensive.
  • Figure 1 shows a device for finding an alternating voltage
  • Figure 2 is a graphical representation of a phase angle
  • FIG. 3 shows a system for finding an AC-conducting conductor
  • Figure 4 is a flowchart of a method for finding an AC-carrying conductor. Detailed description of embodiments
  • FIG. 1 describes a device 100 for finding an AC-conducting conductor 105.
  • a current flows through the conductor 105, so that an electric field E and a magnetic field B prevail in the region of the conductor 105.
  • the device 100 comprises an electric field sensor 110, a magnetic field sensor 115, a processing device 120, a user interface 125 and a battery 130.
  • the processing device 120 is connected to the field sensors 110 and 15 and to the user interface 125 and the battery 130.
  • the electric field sensor 1 10 may be formed in the form of a metallized surface. Depending on how strong the electric field E is, a voltage is produced in the electric field sensor 110 between the surface and a ground terminal which is sampled by the processing means 120 as a signal proportional to the electric field.
  • the magnetic field sensor 1 15 is configured to determine the magnetic field B, which is geometrically perpendicular to the electric field E. If no consumer is operated in a circuit comprising the conductor 105, the magnetic field B can be very small; due to parasitic effects, however, the magnetic field B is practically always sufficiently large to be detected by a sensitive magnetic field sensor 1 15 metrologically.
  • various technologies may be used, such as a Hall sensor, a Förster probe, a GMR, AMR, CMR or TMR probe. It is also possible to use a magnetic field probe based on a field coil.
  • the electric field sensor 110 and the magnetic field sensor 115 are preferably close to each other, so that the specific electric field E and the specific magnetic field B are related to the same measurement location.
  • the sensors 1 10, 1 15 can be controlled alternately or simultaneously to determine the corresponding fields.
  • the user interface 125 has output and controls for a user of the device 100.
  • An output can be visual, audible and / or Haptic done.
  • An input for operation can be made by means of a dedicated button or point. It may also be an advanced user interface, for example in the form of a graphic input and output, for which a graphical output device and a graphical input device may be combined approximately in the form of a touch-sensitive screen. It may also include a further interface, which is provided for data communication with another device. The further interface may be wired or wireless, such as a Bluetooth wireless or Wimax interface.
  • the processing device 120 and optionally the field sensors 1 10 and 1 15 are preferably fed from the battery 130 or a similar electrical energy storage, which allows as complete as possible decoupling of a circuit comprising the conductor 105.
  • the processing device 120 is preferably constructed on the basis of a programmable microcomputer and configured to determine a time offset between the electric field E and the magnetic field B in the form of a time or a phase angle and the AC-carrying conductor 105 on the basis of the determined temporal offset between the specific fields.
  • FIG. 2 shows a diagram 200 with a representation of a phase angle at the conductor 105 from FIG. 1. In the horizontal direction, a real part and in the vertical direction an imaginary part are plotted.
  • phase angle ⁇ is therefore included between temporally corresponding measured values of the field sensors 110 and 15.
  • a first vector 205 corresponds qualitatively to a measured value of the electric field sensor 110 and a second vector 210 qualitatively corresponds to a measured value.
  • the vectors 205 and 210 include the phase angle ⁇ between them. It should be noted that the phase relationship between the vectors 205 and 210 and the measured values of the sensors 1 10 and 1 15 is temporal in nature and is based on an alternating frequency of the AC voltage applied to the conductor 105.
  • the second vector 210 corresponding to the magnetic field B consists of a first portion extending along the real axis of the chart 200 and a second portion extending in the direction of the imaginary axis of the chart 200.
  • the vector 210 is formed by adding the first part to the second part.
  • the first part is called Wrkstrom, the second part reactive current. If the complex resistor comprises only an ohmic load, such as an electric grill, the reactive current is minimal, the active current is maximal and the phase angle ⁇ is approximately 0 °. If the complex resistance is infinitely large, for example in the case of an open line 105, the reactive current is maximal, the active current is minimal and the phase angle ⁇ is close to 90 °. Due to parasitic capacitances and other, hardly avoidable effects in the region of the conductor 105, the phase angle ⁇ generally reaches neither 0 ° nor 90 ° completely.
  • the complex resistor is a load which is a combination of an ohmic resistance, an inductive and / or a capacitive resistance, and the phase angle ⁇ is somewhere between the described extremes.
  • phase angle ⁇ basically also sets with a very small current through the conductor 105 and a correspondingly small magnetic field E.
  • the phase angle ⁇ and the ratio between reactive current and Wrkstrom is independent of the absolute size of the current through the conductor 105.
  • the electric field sensor 110 can be dimensioned correspondingly large in order to amplify a signal indicative of the electric field E. Even if the electric field sensor 110 is not necessarily suitable because of the oversizing.
  • Field sensor 110 is in the method according to the invention in the clear definition of the real reference axis. The actual detection of the power line is then made with the magnetic field sensor 115.
  • the signals of the field sensors 110 and 115 may be multiplied by appropriate factors.
  • FIG. 3 shows a system 300 for finding the alternating voltage-carrying conductor 105 from FIG. 1.
  • the alternating voltage-carrying conductor 105 and a corresponding return conductor 305 run close together. This constellation is common in electrical supply lines, which are laid, for example, as part of a domestic installation in a wall.
  • the conductor 105 and the return conductor 305 are each connected at one end to an AC voltage source 310, which provides a substantially sinusoidal AC voltage.
  • the AC voltage can be, for example, 1 10 V at 60 Hz or 230 V at 50 Hz.
  • the system 300 comprises the device 100 from FIG. 1 and a phase angle generator 315 which can be connected to the respective other ends of the conductor 105 or the return conductor 305.
  • the phase angle generator 315 is constructed of passive components and forms a complex resistor, wherein neither real nor imaginary part of the complex resistance is negligible.
  • the phase angle generator 315 can be constructed, for example, by means of an inductance or a capacitance, which is optionally in series with an ohmic resistance.
  • the complex resistance of the phase angle generator 315 causes a comfor- Plex current through the conductor 105 and the return conductor 305, wherein the complex current with the voltage of the AC voltage source 310 includes the phase angle ⁇ , which has been described in detail above with reference to Figure 2.
  • the device 100 can now be moved in the region of the conductor 105 or the return conductor 305, for example, between a first measuring location 320 and a second measuring location 325, so that the field sensors 1 10 and 15 the electric field E and the magnetic field B in Detecting the area of the conductor 105 or 305.
  • the phase angle ⁇ or the corresponding time offset of the fields is determined and compared with the reference phase angle, which is predetermined between the current and the voltage of the conductors 105, 305 by the design of the phase angle generator 315.
  • a signal is output at the device 100 which assists a user in moving the device 100 along the conductors 105, 305 and thus finding out the course of the conductors 105, 305.
  • FIG. 4 shows a flow diagram of a method 400 for finding the alternating voltage-carrying conductor 100 or 305 from FIGS. 1 or 3.
  • the method 400 starts with one of three possible variants for defining the reference time offset.
  • a step 405 the sensors 1 10, 1 15 are moved to the second measuring location 325 from FIG. 3.
  • the second measurement location is preferably at a point known to be close to the conductor 105, for example in the region of a terminal for the phase angle generator 315.
  • step 410 the electric field and in step 415 the magnetic field in the region of Conductor 105 detected.
  • step 420 the reference phase angle or reference offset between the fields is determined.
  • the reference offset is manually defined in a step 425, for example by means of the user interface 125.
  • an input can take place in the form of a time or in the form of a phase angle.
  • the temporal reference offset is already fixed in a step 430.
  • This variant corresponds to the procedure explained above with reference to FIG. 3, in which the phase angle generator 315 at least during the subsequent steps 440 and 445 of the method 400, the reference phase angle between the current and the voltage of the conductor 105 or 305 is generated.
  • the sensors 110 and 15 are moved to the first measurement location 320 in a step 435.
  • Steps 440 and 445 may also be performed simultaneously or in reverse order.
  • the time offset for example in the form of the phase angle ⁇ , is determined in a step 450.
  • the determined offset is compared with the predetermined reference offset.
  • a signal is output to a user of the device 100 in a step 460.
  • the signal may indicate that the offset is no more than a predetermined amount different from the reference offset.
  • the signal may also indicate that there is greater than a predetermined difference between the skew and the reference skew.
  • a window comparison may also be performed as to whether the particular temporal offset is between a first and a second reference offset, each of which has been defined by means of one of the three variants given above in steps 405 to 430.
  • the device 100 which is designed in particular as a hand-held measuring device, has a housing and moreover optionally or alternatively at least one of the following features:
  • Indicator display, LEDs, etc.
  • Interface HMI for example in the form of a keyboard or a touch display
  • Auto-off power-saving feature that turns the meter off or into "stand-by" mode after a specified or predefinable time after the last measurement has been taken
  • -Weggeber (wheels, photoelectric sensors, acceleration sensors, optical displacement sensor, etc.) which make it possible to detect the path traveled by the measuring device, for example, on a wall, so as to assign, for example, a measured value and a location coordinate

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Measuring Magnetic Variables (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

L'invention concerne un procédé pour trouver un fil conducteur d'une tension alternative, comprenant les étapes de détection d'un champ électrique en un premier site de mesure, la détection d'un champ magnétique au premier site de mesure, la détermination d'un décalage dans le temps entre les champs détectés, la comparaison du décalage déterminé avec un décalage de référence et l'émission d'une signalisation du fil en fonction de la comparaison. Un dispositif pour trouver un fil conducteur d'une tension alternative comprend un premier capteur pour détecter un champ électrique en un premier site de mesure, un deuxième capteur pour détecter un champ magnétique au premier site de mesure, un appareil de traitement pour déterminer un décalage dans le temps entre les champs détectés et un appareil émetteur pour émettre une signalisation du fil. L'appareil de traitement est conçu pour commander l'appareil émetteur en fonction d'une comparaison du décalage déterminé avec un décalage de référence.
PCT/EP2012/054101 2011-04-29 2012-03-09 Procédé et dispositif pour la détection de fils Ceased WO2012146433A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011017761.2 2011-04-29
DE201110017761 DE102011017761A1 (de) 2011-04-29 2011-04-29 Verfahren und Vorrichtung zur Leitungsdetektion

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WO2012146433A2 true WO2012146433A2 (fr) 2012-11-01
WO2012146433A3 WO2012146433A3 (fr) 2013-05-10

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WO (1) WO2012146433A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013212297A1 (de) 2013-06-26 2014-12-31 Robert Bosch Gmbh Vorrichtung und Verfahren zum Detektieren einer wechselspannungsführenden Leitung

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Publication number Priority date Publication date Assignee Title
DE102013212630B4 (de) 2013-06-28 2025-11-20 Robert Bosch Gmbh Verfahren und Vorrichtung zum Bestimmen einer Messgenauigkeit
EP3153821A1 (fr) 2015-10-09 2017-04-12 Siko GmbH Système de détection
DE102016119003A1 (de) 2015-10-09 2017-04-13 Siko Gmbh Sensoranordnung
CN105824253B (zh) * 2016-01-21 2018-02-09 中国地质大学（北京） 一种基于蓝牙与微波技术的无线控制电法勘探仪器及其方法

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DE398267C (de) * 1923-04-28 1924-07-05 Rudolf Hans Richter Einrichtung zum Nachweis von leitenden Koerpern
JP4289578B2 (ja) * 2000-06-15 2009-07-01 関西電力株式会社 埋設ケーブル探査方法
GB2427476B (en) * 2005-06-20 2008-06-25 Radiodetection Ltd A detector for detecting a buried current carrying conductor
DE102005061868A1 (de) * 2005-12-23 2007-07-05 Robert Bosch Gmbh Vorrichtung zur Bestimmung eines Gegenstands, insbesondere Ortungsgerät und Materialerkennungsgerät
US7701196B2 (en) * 2006-08-18 2010-04-20 The United States Of America As Represented By The Secretary Of The Army Methods for detecting and classifying loads on AC lines
US20110066379A1 (en) * 2008-05-26 2011-03-17 Mes Marius J survey system for locating geophysical anomalies
GB2464279B (en) * 2008-10-07 2012-10-24 Thales Holdings Uk Plc Detection of a buried electric wire

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013212297A1 (de) 2013-06-26 2014-12-31 Robert Bosch Gmbh Vorrichtung und Verfahren zum Detektieren einer wechselspannungsführenden Leitung

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WO2012146433A3 (fr) 2013-05-10
DE102011017761A1 (de) 2012-10-31

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