EP3104373A1 - Cable de courant de haute intensite et procede de determination du degre d'usure de cables de courant de haute intensite - Google Patents

Cable de courant de haute intensite et procede de determination du degre d'usure de cables de courant de haute intensite Download PDF

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Publication number
EP3104373A1
EP3104373A1 EP16171148.6A EP16171148A EP3104373A1 EP 3104373 A1 EP3104373 A1 EP 3104373A1 EP 16171148 A EP16171148 A EP 16171148A EP 3104373 A1 EP3104373 A1 EP 3104373A1
Authority
EP
European Patent Office
Prior art keywords
current
current cable
measuring
line
cable
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.)
Granted
Application number
EP16171148.6A
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German (de)
English (en)
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EP3104373B1 (fr
Inventor
Arndt Dung
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Individual
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Individual
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Priority to PL16171148T priority Critical patent/PL3104373T3/pl
Publication of EP3104373A1 publication Critical patent/EP3104373A1/fr
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Publication of EP3104373B1 publication Critical patent/EP3104373B1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/001—Power supply cables for the electrodes of electric-welding apparatus or electric-arc furnaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/32—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks

Definitions

  • the invention relates to a high-current cable for electrically operated furnaces, plants for electroslag remelting and reduction furnaces and a method for determining the degree of wear of a high-current cable for electrically operated furnaces and electroslag remelting.
  • High-current cables are known in various embodiments from the prior art.
  • corresponding high-current cables are used in particular to connect the secondary side of a transformer of a corresponding high-current system with an electrode or a support arm for an electrode of a ladle or electric arc furnace or another component operated with high current.
  • Small ladle furnaces typically have three phases and are connected with two high current cables per phase.
  • Larger ovens typically use up to four high-current cables per phase.
  • the invention is therefore based on the object to provide a simple method and a high-current cable that allows trouble-free and cost-effective operation, protects the system from damage and makes a routine replacement of high-current cables not necessary and thus leads to lower operating costs.
  • the high-current cable according to the invention for electrically operated furnaces and systems for electroslag remelting method has at least one electrical line element, a feed line arranged at a first position of the line element for a measuring current and a return line for the measuring current arranged at a second position of the line element.
  • a first and a second measuring point are arranged on the line element, wherein a first transmission means for a first measuring signal are connected to the first measuring point and to the second measuring point a second transmission means for a second measuring signal.
  • the high-current cable according to the invention advantageously allows a regular measurement of the condition of the line element, whereby the wear of the high-current cable can be determined in a particularly simple manner without having to remove the high-current cable from the system, resulting in a considerable increase in operating costs the downtime of the plant would result.
  • the stationary arrangement of the measuring points and the feed line and the return line allows a particularly precise and easily reproducible measurement of the individual High power cable.
  • a high current is initially switched off to operate the furnace or the system and a measuring current is introduced via a feed line connected to a line element of the high-current cable at a first position and by means of a arranged at a second position of the conduit member return line.
  • a measurement of at least one measurement signal is carried out at two spaced, arranged on the line element measuring points and finally an evaluation of the measurement signal and a determination of the degree of wear of the high current cable is made.
  • the inventive method makes it possible advantageously to measure the high-current cable during operation or in short breaks, for example, to fill the furnace, regularly and thus to determine the already occurred wear of the high-current cable.
  • unwanted operational failures due to failures of a high-current cable are prevented and at the same time the life of all high-current cables avoided by the absence of current or voltage spikes due to the failure of a single high-current cable.
  • the high-current cable can be used over its maximum operating time, so that premature replacement is unnecessary and thus the operating costs can be reduced.
  • the fixed arrangement of the feed line and the return line and the two measuring points on the high-current cable allows particularly precise measurements, which are not possible in the devices of the prior art, since on the one hand the measurement of a conventional high-current cable within a system, the changing contact resistance of the cable On the other hand, slight variations in the measuring positions make a series of precise, reproducible measurements impossible.
  • a high-current cable is basically understood any cable that is suitable to conduct a high current, in particular with a current greater than 0.5 kA, preferably greater than 1 kA, more preferably greater than 5 kA and most preferably greater than 10 kA.
  • the high-current cable can initially be configured in any desired manner.
  • the high current cable can be uncooled, water cooled or air cooled.
  • the high-current cable can be formed both from an electrical line element, as well as comprise an electrical line element and an insulation or a sheath.
  • a high-current cable may initially have an arbitrary length, but preferably the length of a high-current cable is 1-15 m, particularly preferably 2.5-12.5 m and very particularly preferably 4-10 m.
  • the electrical conduction element is a component or an assembly of the high-current cable which is or is provided for conducting the high current.
  • the electrical conduction element is preferably formed essentially of metal, particularly preferably of a copper alloy and very particularly preferably essentially of pure copper.
  • the electrical conduction element can have any shape, in particular an arbitrary cross section.
  • the electrical line element preferably has a round cross section whose diameter is between 100 mm 2 and 10,000 mm 2 , preferably between 200 mm 2 and 9,000 mm 2 and particularly preferably between 250 mm 2 and 7,500 mm 2 .
  • an electrically operated furnace any system in which a high current is used for operation to produce high temperatures inside the plant or which can be used to process a metal or a metal-containing substance under the action of high temperatures.
  • these are systems for melting and treating metal, in particular ladle furnaces or electric arc furnaces and / or systems for carrying out an electroslag remelting process.
  • the feed line and the return line are each a component which is intended to conduct an electric current.
  • the feed line and the return line are each essentially formed by an electrical conductor, in particular preferably by a metallic cable.
  • the metallic cable is preferably formed from copper or a copper alloy and particularly preferably has an insulation and / or a sheathing, in particular made of a plastic or a lacquer layer.
  • the diameter of the feed line and the Return each between 20 mm 2 and 100 mm 2 , more preferably between 25 mm 2 and 75 mm 2 and most preferably between 35 mm 2 and 50 mm 2 .
  • the feed line and the return line can be formed both single-core and multi-core.
  • the feed line and the return line are at least partially formed as a single, two-core cable, in particular each at an end facing away from the line element of the feed line and the return line.
  • the feed line and the return line are electrically conductively connected to the line element and can form a circuit together with at least one section of the line element.
  • the feed line and the return line are fixed directly and fixed to the line element.
  • the measuring current can initially be any desired electrical current. This is preferably a constant current introduced for a certain duration, the duration preferably being between 500 ms and 30 s, more preferably between 1 s and 15 s, and very particularly preferably between 2.5 s and 7.5 s ,
  • the measuring current can be both a direct current and an alternating current.
  • the current intensity is preferably between 50 A and 1.5 kA, particularly preferably between 100 A and 1 kA, and very particularly preferably between 250 A and 750 A.
  • the frequency is preferred 50-60 Hz or alternatively preferably between 100 Hz and 1 kHz, more preferably between 250 Hz and 1 kHz.
  • a measuring point it is initially only a fixed, stationary position on the line element at which a measurement signal can be determined.
  • the first and the second measuring point are preferably arranged on the first and / or the second position or between the first and second position.
  • a means for receiving or measuring a measuring signal is fixedly arranged at the measuring point.
  • the means for receiving a measurement signal is in the simplest case a wire or cable, but may also comprise a circuit.
  • the transmission means is directly or indirectly via another component, for example a means for receiving, measuring and / or processing a measuring signal, for example a transmitter, connected to one of the measuring points and formed such that the transmission means can forward or transmit a signal measured at the measuring point or data obtained by processing.
  • a measuring signal for example a transmitter
  • the measurement signal may initially be any physical quantity or any physical property.
  • the measurement signal may be an electrical current.
  • a measurement of the measurement signal is understood as the detection of a corresponding physical property, for example an electrical current.
  • the measurement of a measurement signal may already include first steps of an evaluation or data processing, for example the determination of typical electrical parameters or properties of an electrical conductor, such as current, voltage, resistance, voltage difference with respect to another component, in particular grounding, or Properties of the resulting magnetic field.
  • the evaluation of the measurement signal is understood to mean at least the process in which a value or a characteristic number is determined from at least one, preferably a plurality of measurement signals and / or variables derived therefrom, which provides information about the state of the high-current cable, in particular of the line element of the high-current cable.
  • the degree of wear is a value for describing the condition of the high-current cable, in particular the line element of the high-current cable, wherein the degree of wear describes the degree of wear or wear with increasing operating time of a high-current cable.
  • the shutdown of the high-current cable comprises a complete shutdown, particularly preferably a physical separation of at least one end of the high-current cable from the power supply for operating the furnace, in particular from the secondary side of a transformer. This can in particular by means of a switch or other mechanical or electronic switching device respectively.
  • the introduction of a measuring current basically means any adjustment of the current intensity in the line element of the high-current cable to the current intensity of the measuring current.
  • the introduction of the measuring current is independent of and / or from a power source other than the power supply for operating the furnace, in particular the secondary side of a transformer for operating the furnace.
  • the first and the second measuring point along the line element forming a measuring section are spaced from each other, is fixed by the stationary arrangement of the two measuring points the measuring section and thus precisely reproducible measurements of the line element are made possible in a particularly simple manner ,
  • the measuring section has a length between 95% and 85%, preferably between 95% and 90% and particularly preferably 95% of the length of the line element, whereby a particularly simple and precise measurement of known as particularly burdened Sections of the high current cable can be made.
  • the length of the measuring section corresponds to the length of the line element and the two measuring points are arranged in the region of one end of the line element.
  • the first measuring point is arranged at the first position and / or the second measuring point at the second position, whereby particularly precise measurements are made possible, since the positions of the input or return line of the measuring current correspond to the points of the line element of the High current cable correspond to where the measurement signals are detected.
  • the first position along the line element from the second position at least a distance between 10% and 100%, preferably between 25% and 90% and more preferably between 35% and 65% of the length of the conduit element.
  • the feed line and / or the return line are at least partially arranged in an insulation or a sheathing of the high current cable, resulting in a particularly easy handling of the high current cable and at the same time a change in the measurement signals due to different with respect to each other, current-carrying lines is avoided.
  • the feed line and / or the return line extend on the section of the high-current cable within an insulation or a sheathing, in which the feed line and / or the return line are guided parallel to the line element of the high-current cable.
  • both the feed line and the return line emerge from the insulation or the sheathing of the high-current cable at a common position, wherein the feed line and the return line are particularly preferably formed as a two-core cable.
  • both the feed line and the return line are conductively connected to the line element of the high-current cable only at the first or second position.
  • the first and / or the second transmission means are at least partially arranged in an insulation or a sheathing of the high-current cable, resulting in a particularly easy handling of the high-current cable and at the same time a change of the measurement signals due to different with respect to each other extending, current-carrying lines is avoided.
  • both transfer means emerge from the insulation or the sheathing of the high current cable at a common position, so that both transmission means can be connected in a particularly simple manner to a device for detecting and / or evaluating the measurement signal.
  • the high-current cable comprises at least one, preferably both transmission means an electrical measuring line, which preferably comprises a core of metal, in particular copper, for example copper wire or copper wire and particularly preferably further comprises an insulation.
  • the diameter of the metal core is between 0.5 mm 2 and 10 mm 2 , more preferably between 1 mm 2 and 5 mm 2, and most preferably 2.5 mm 2 .
  • the high-current cable comprises at least one, preferably both of the transmission means an optical conductor, in particular a fiber optic cable, more preferably at each optical conductor, a transducer for converting an electrical signal into an optical signal is arranged, whereby a particularly fast and, for example By induction uninfluenced data transfer is made possible in an advantageous manner and thus the accuracy of the measurement is improved.
  • the transmitter is arranged in the region of the measuring point, and particularly preferably the transmitter is arranged completely within a casing or insulation of the high-current cable.
  • connection element for a measuring device or a measuring line which is in electrical contact with the line element of the high-current cable is arranged at the first and / or second measuring point, whereby further measurements or the acquisition of further measured values are made possible in a particularly simple manner
  • a connection element is understood to mean first any device which is provided to connect a measuring line or a measuring device.
  • the connection element preferably comprises a region which is in electrical contact with the line element and a closure device which completely covers this area and can be opened, which in the closed state isolates the closure device, allowing electrical access to the line element, in particular by insulation and / or a jacket of the high-current cable ,
  • a Rogowski coil or a Rogowski belt is arranged surrounding the line element, wherein the Rogowski coil is particularly preferably arranged within an insulation or sheathing of the high-current cable.
  • the shutdown of the high current by means of a contactor wherein particularly preferably by means of Sagittarius at the same time the introduction of the measuring current is switched.
  • Particularly preferred is a potential separation between the high current circuit for operating the system and the measuring circuit.
  • the measurement comprises a detection of a voltage drop, a voltage difference and / or an inductive reactance, whereby a change in the structure of the high current cable, in particular of the line element of the high current cable can be detected in a particularly simple manner.
  • the evaluation comprises an observation of a signal change over a time interval and / or with respect to a reference, in particular with respect to values measured at a shielded ground.
  • a measure of the connected high-current cable is made during pauses in operation of the system, for example between the melting of various metal alloys in an electrically operated oven and examined for a change in the measured values over time, indicating an alteration of the high-current cable, in particular may indicate a wear of the line element.
  • a plurality of mutually insulated line elements of a high-current cable or several high-current cables of an electrical high-current system, in particular an electrically operated furnace are measured in sequence and then the measurement signals for each line element or each high-current cable individually and / or in relation evaluated each other.
  • the first embodiment of a high-current cable 1 has an electrical line element 2 and a surrounding the electrical line element 2 sheath 9.
  • the electrical conduction element 2 is formed from a copper alloy and has a round cross section with a diameter of 7,500 mm 2 .
  • the length of the electrical conduction element 2 is 8 m.
  • a feed line 3 formed of copper and having a diameter of 50 mm 2 is connected in a stationary manner to the electrical line element 2 directly at a first position 5 a.
  • the feed line 3 has a length of 2 m and is provided to introduce a measuring current with a current of 100 A into the electrical line element 2.
  • a return line 4 is stationary and arranged directly on the line element at a second position 5b, wherein the return line 4 in particular in diameter and in the material of the feed line 3.
  • the return line has a length of about 8 m.
  • the feed line 3 and the return line 4 are both arranged at the respective electrical line element 2 facing ends within the casing 9 of the high current cable 1, in particular the return line 4 over a distance of about 6 m parallel to the electrical line element 2 within the casing 9 of the high current cable 1 is guided to the feed line 3, so that the feed line 3 and the return line 4 leave the sheath 9 of the high-current cable 1 at a common position.
  • the outside of the casing 9 of the high-current cable 1 located part of the feed line 3 and the return line 4 is a single, two-core cable surrounded by an insulation 10 surrounded by plastic, said part of the feed line 3 and the return line 4 has a length of about 1.8 m having.
  • the distance of the first position 5a from the second position 5b along the electrical line element 2 is about 6 m and thus 80% of the length of the electrical line element second
  • a first measuring point 6a is arranged, at which a first measuring transducer 11 arranged inside the casing 9 of the high-current cable 1 is connected in an electrically conductive manner to the electrical conducting element 2.
  • a second measuring point 6b with a second measuring transducer 12 is arranged, so that the distance between the first measuring point 6a and the second measuring point 6b along the longitudinal axis of the electrical conducting element 26 m.
  • the two transducers 11, 12 thereby convert an electrical signal picked up by the electrical line element 2 at the two measuring points 6a, 6b into an optical signal.
  • the optical signal is then introduced by the first transmitter 11 in a first transmission means 7 and the second transmitter 12 in a second transmission means 8, wherein both transmission means 7, 8 are formed by optical fiber cable.
  • the two transmission means 7, 8 extend in sections to the transmitters 11, 12 facing ends within the casing 9 of the high current cable 1, in particular the second transmission means 8 parallel to the electrical line element 2 within the casing 9 of the high-current cable 1 to the first transmission means 7 to in that the first transmission means 7 and the second transmission means 8 emerge at a common position from the jacket 9 of the high-current cable 1.
  • a measurement for determining the degree of wear of the high-current cable 1 takes place by first switching off a high current on the high-current cable 1 which is necessary for the operation of a corresponding system and subsequently via the supply line 3 and the return line 4 a measuring current with a current of 100 A for a duration of at least 5 s is initiated.
  • the measuring current is applied to the electrical line element 2, in particular between the first position 5a and the second position 5b, at least the voltage is at each of the first and the second measuring point 6a, 6b through the two measuring transducers 11, 12 determined at the electrical line element 2 with respect to a shielded ground, each converted into an optical signal and forwarded by means of the two transmission means 7, 8 to an evaluation unit.
  • the measured signals are then evaluated and an index of the degree of wear of the high current cable 1 is determined, wherein the evaluation is based at least on the change over time of a determined in a variety of measurements voltage drop between the first measuring point 6a and the second measuring point 6b.
  • the measurement signals and / or the characteristics of the individual high-current cable 1 can be set in relation to each other in order to obtain information about the state of the entire system beyond a single high-current cable 1.

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  • Testing Relating To Insulation (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
EP16171148.6A 2015-06-10 2016-05-24 Cable de courant de haute intensite et procede de determination du degre d'usure de cables de courant de haute intensite Active EP3104373B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16171148T PL3104373T3 (pl) 2015-06-10 2016-05-24 Przewód wysokoprądowy i sposób określania stopnia zużycia przewodów wysokoprądowych

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015109194.1A DE102015109194B4 (de) 2015-06-10 2015-06-10 Hochstromkabel und Verfahren zur Ermittlung des Verschleißgrades von Hochstromkabeln

Publications (2)

Publication Number Publication Date
EP3104373A1 true EP3104373A1 (fr) 2016-12-14
EP3104373B1 EP3104373B1 (fr) 2018-01-03

Family

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Family Applications (1)

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EP16171148.6A Active EP3104373B1 (fr) 2015-06-10 2016-05-24 Cable de courant de haute intensite et procede de determination du degre d'usure de cables de courant de haute intensite

Country Status (4)

Country Link
EP (1) EP3104373B1 (fr)
DE (1) DE102015109194B4 (fr)
ES (1) ES2663919T3 (fr)
PL (1) PL3104373T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114740244A (zh) * 2022-04-01 2022-07-12 核工业西南物理研究院 一种用于等离子体电流分布诊断的罗氏线圈探针

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017203153A1 (de) 2017-02-27 2018-08-30 Siemens Aktiengesellschaft Starres, elektrisch leitendes Verbindungselement und Verfahren zum Herstellen eines starren, elektrisch leitenden Verbindungselementes

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011016966A1 (de) * 2011-04-13 2012-10-18 Saveway Gmbh & Co. Kg Kühlkanal und Stromkabel

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2333897C3 (de) * 1973-06-29 1978-10-26 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schaltungsanordnung zur Überwachung beweglicher elektrischer Leitungen auf Isolationsfehler
DE3615557A1 (de) * 1986-05-09 1987-11-12 Felten & Guilleaume Energie Einrichtung zur strommessung bei einem energiekabel unter einsatz von lichtwellenleitern (lwl)
FR3007188B1 (fr) * 2013-06-14 2015-06-05 Commissariat Energie Atomique Systeme pour controler l'usure d'un cable electrique

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011016966A1 (de) * 2011-04-13 2012-10-18 Saveway Gmbh & Co. Kg Kühlkanal und Stromkabel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114740244A (zh) * 2022-04-01 2022-07-12 核工业西南物理研究院 一种用于等离子体电流分布诊断的罗氏线圈探针

Also Published As

Publication number Publication date
DE102015109194B4 (de) 2017-03-23
EP3104373B1 (fr) 2018-01-03
DE102015109194A1 (de) 2016-12-15
PL3104373T3 (pl) 2018-07-31
ES2663919T3 (es) 2018-04-17

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