EP0571319A2 - Transformateur du courant avec un noyau en forme de baguette - Google Patents

Transformateur du courant avec un noyau en forme de baguette Download PDF

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Publication number
EP0571319A2
EP0571319A2 EP93810227A EP93810227A EP0571319A2 EP 0571319 A2 EP0571319 A2 EP 0571319A2 EP 93810227 A EP93810227 A EP 93810227A EP 93810227 A EP93810227 A EP 93810227A EP 0571319 A2 EP0571319 A2 EP 0571319A2
Authority
EP
European Patent Office
Prior art keywords
measuring device
current measuring
voltage
current
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.)
Granted
Application number
EP93810227A
Other languages
German (de)
English (en)
Other versions
EP0571319A3 (fr
EP0571319B1 (fr
Inventor
Ulrich Kull
Max Friedrich
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.)
Moser Glaser and Co AG
Original Assignee
Moser Glaser and Co 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 Moser Glaser and Co AG filed Critical Moser Glaser and Co AG
Publication of EP0571319A2 publication Critical patent/EP0571319A2/fr
Publication of EP0571319A3 publication Critical patent/EP0571319A3/fr
Application granted granted Critical
Publication of EP0571319B1 publication Critical patent/EP0571319B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase AC
    • H01F38/28—Current transformers
    • H01F38/30—Constructions

Definitions

  • the present invention relates to a current measuring device for the proportional conversion of a primary current at the high voltage level into a reduced secondary current according to the induction principle.
  • the current measuring device is preferably used for protection and measurement purposes.
  • FIG. 1a Current measuring devices for alternating current are known in which the current to be measured flows through a winding and is transmitted to a second winding, via whose measuring devices connected to the winding a measurement of the current image takes place.
  • the two windings are usually arranged concentrically on a closed iron core.
  • Figures 1a and 1b show two examples of arrangements typically used in the prior art.
  • a closed iron core with its secondary winding 1 is chained to the high-voltage winding 2.
  • the core with secondary winding 3 and the high-voltage winding 4 are chained together.
  • Typical of this concept is the fact that the iron core, carrying one of the two windings, encompasses the second winding - or if this consists of only one conductor, this conductor.
  • the invention is based primarily on a new arrangement of the components used. It is defined in independent claim 1; preferred embodiments result from the dependent claims.
  • the primary winding is arranged around the secondary winding with an elongated iron core at a distance which is available for introducing high-voltage insulation.
  • the secondary winding and core are located in an earthed, electrically conductive tube in which the leads of the secondary winding are led to earth.
  • the iron core is preferably dimensioned such that there is a reduction effect over its entire extent due to the leakage flux for the magnetic force flow in the core.
  • the core with one winding 5 and the other winding 6 are structures which are completely separate from one another and do not encompass or overlap at any point.
  • FIG. 3 shows an exemplary embodiment of a current measuring device according to the invention for the high-voltage region.
  • the active part of the current transformer consists of a primary winding 7 made of a conductor material such as copper or aluminum, which is guided in one or more turns around an insulating body 10, and of a secondary winding 8 made of a conductor material such as copper, which as a coil with one of the desired Current ratio corresponding number of turns is pushed over a rod core 9 made of laminated ferromagnetic material such as grain-oriented silicon iron and is arranged together with this at the level of the primary winding in an electrically conductive, grounded tube 12, in which the leads of the secondary winding lead to earth.
  • a primary winding 7 made of a conductor material such as copper or aluminum, which is guided in one or more turns around an insulating body 10
  • a secondary winding 8 made of a conductor material such as copper, which as a coil with one of the desired Current ratio corresponding number of turns is pushed over a rod core 9 made
  • the insulating body 10 is provided in a similar way to a high-voltage bushing with capacitive, conductive coatings for controlling the electrical field and, in the case of outdoor use, with screens made of a suitable material such as For example, porcelain or silicone rubber surround, wherein the upper end in the area of the active transducer part is formed on the outside as a high-voltage electrode and is closed at the top.
  • This also allows the simultaneous combination of this inductive rod core current transformer with a capacitive voltage transformer by tapping (11) the voltage at one (12a) of the capacitive intermediate linings, which is directly opposite the tube 12.
  • the conductive control pads and electrodes as well as the support tube are designed so that they do not form a short-circuit turn in the area of the active part of the current transformer.
  • the compensation devices consisting of known inductive, capacitive and ohmic switching elements, which may be necessary to correct the translation and angular error, are arranged at the earthed end of the support tube.
  • a saturation choke is connected in parallel.
  • the active elements of the current or voltage converter are dimensioned in such a way that sufficient power is available for the trouble-free transmission of the measurement signals and the safe control of electronic protective relays and measuring devices.
  • FIG. 4 shows how two (or possibly also several) of the devices described above can be connected together to form a (here two-stage) cascade.
  • the two short-controlled parts 15 and 16 of the insulating body lie opposite one another.
  • the medium voltage to earth or from is dissipated via the elongated parts 13 and 19 of the insulating body high voltage to be measured to medium potential.
  • a coupling winding 17 ensures the magnetic coupling of the two wound rod cores.
  • the upper cascade element is supplied via a current transformer 18 in the high-voltage line to be measured. This converter is firmly connected to the upper cascade element.
  • the high voltage can be measured in a known manner by means of a resonance choke and intermediate converter via a measuring covering 20 which is brought out close to the earth.
  • the various compensation elements and the elements for voltage measurement can be found in foot 14 of the cascade.
  • FIG. 5 shows a diagram of a secondary circuit with separate relay connection 21 and measurement connection 22.
  • the measurement connection 22 has a compensation circuit 23 for correcting the angular error.
  • a choke 24 with an iron core, which bridges the measuring connection 22 and the compensation circuit 23, is dimensioned such that it saturates in the overcurrent range and thus relieves the burden on the secondary circuit.
  • FIG. 6 shows the measurement connection 22 with its compensation circuit. This consists of a linear inductor 26 connected upstream of the measuring connection and an optical resistor 27, which is connected in parallel to the series connection of the measuring connection and inductance. The corresponding setting of the value of the ohmic resistance allows the desired correction of the angular error in both directions.
  • capacitor 29 In order to keep the burden on the secondary circuit of the current transformer low, compensation is advantageously made for the angle error correction required inductance by a capacitor 29 according to FIG. 7.
  • capacitor 29 and compensation circuit 23 with a load connection are short-circuited by a parallel-connected choke 30 with an iron core, which is dimensioned such that it saturates in this range. This effectively relieves the load on the secondary circuit when a short-circuit current is transmitted.
  • the magnetic circuit is additionally influenced in the desired manner by attaching rods or sheets 31 made of magnetic materials radially outside the primary winding, which at the same time provides effective protection against external magnetic disturbances.
  • the use of capacitively controlled high-voltage insulation offers the possibility to bring out a measuring surface near the earth and thus measure the voltage in a manner known per se via a resonance choke and a medium-voltage converter, so that a combined measuring device for current and voltage is provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Cable Accessories (AREA)
EP93810227A 1992-04-03 1993-03-30 Transformateur du courant avec un noyau en forme de baguette Expired - Lifetime EP0571319B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1101/92 1992-04-03
CH110192 1992-04-03

Publications (3)

Publication Number Publication Date
EP0571319A2 true EP0571319A2 (fr) 1993-11-24
EP0571319A3 EP0571319A3 (fr) 1993-12-15
EP0571319B1 EP0571319B1 (fr) 1996-06-12

Family

ID=4202500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93810227A Expired - Lifetime EP0571319B1 (fr) 1992-04-03 1993-03-30 Transformateur du courant avec un noyau en forme de baguette

Country Status (7)

Country Link
US (1) US5504419A (fr)
EP (1) EP0571319B1 (fr)
AT (1) ATE139365T1 (fr)
CA (1) CA2093288A1 (fr)
DE (1) DE59302880D1 (fr)
ES (1) ES2089773T3 (fr)
NO (1) NO931245L (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH692161A5 (fr) * 1997-07-04 2002-02-28 Lem Liaisons Electron Mec Capteur de courant.
JP2004201482A (ja) * 2002-05-08 2004-07-15 Fiderikkusu:Kk スイッチング電源装置
US20120092115A1 (en) * 2008-11-27 2012-04-19 Mohan Srinivasrao Current transformer
DE102010005086B4 (de) * 2010-01-15 2018-05-24 Siemens Aktiengesellschaft Hochspannungsdurchführung
DE102021109474A1 (de) 2021-04-15 2022-10-20 TenneT TSO GmbH Elektrische Spule, angeordnet in einem elektromagnetischen Wechselfeld zum Erzeugen von Eigenbedarfstrom

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2703390A (en) * 1951-10-11 1955-03-01 Gen Electric Explosion-safe transformer
US2945912A (en) * 1953-06-15 1960-07-19 Moser Glaser & Co Ag High voltage insulator
US2947958A (en) * 1955-07-18 1960-08-02 Gen Electric High voltage current transformer
US3187282A (en) * 1962-09-24 1965-06-01 Sigma Instruments Inc Current probe for high tension lines
FI46571C (fi) * 1972-04-07 1973-04-10 Stroemberg Oy Ab Suurjännitevirtamuuntaja.
FI46572C (fi) * 1972-04-07 1973-04-10 Stroemberg Oy Ab Jännitemuuntaja.
DE2325450A1 (de) * 1973-05-17 1974-11-21 Siemens Ag Einleiterwandler fuer hochspannungsschaltanlagen
FI50460C (fi) * 1974-10-28 1976-03-10 Stroemberg Oy Ab Putkieristeinen vaippasydänvirtamuuntaja
FI50461C (fi) * 1975-02-18 1976-03-10 Stroemberg Oy Ab Virtamuuntaja

Also Published As

Publication number Publication date
ES2089773T3 (es) 1996-10-01
EP0571319A3 (fr) 1993-12-15
NO931245L (no) 1993-10-04
EP0571319B1 (fr) 1996-06-12
DE59302880D1 (de) 1996-07-18
ATE139365T1 (de) 1996-06-15
NO931245D0 (no) 1993-03-31
CA2093288A1 (fr) 1993-10-04
US5504419A (en) 1996-04-02

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