EP0668598A1 - Transformateur de courant à noyau annulaire destiné à être monté dans une installation de commutation à haute tension encapsulée en métal - Google Patents

Transformateur de courant à noyau annulaire destiné à être monté dans une installation de commutation à haute tension encapsulée en métal Download PDF

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Publication number
EP0668598A1
EP0668598A1 EP94102403A EP94102403A EP0668598A1 EP 0668598 A1 EP0668598 A1 EP 0668598A1 EP 94102403 A EP94102403 A EP 94102403A EP 94102403 A EP94102403 A EP 94102403A EP 0668598 A1 EP0668598 A1 EP 0668598A1
Authority
EP
European Patent Office
Prior art keywords
encapsulation
current transformer
toroidal
toroidal core
gap
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
EP94102403A
Other languages
German (de)
English (en)
Other versions
EP0668598B1 (fr
Inventor
Walter Lacher
Gerardo Palmieri
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.)
General Electric Switzerland GmbH
Original Assignee
GEC Alsthom T&D 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 GEC Alsthom T&D AG filed Critical GEC Alsthom T&D AG
Priority to AT94102403T priority Critical patent/ATE151195T1/de
Priority to EP94102403A priority patent/EP0668598B1/fr
Priority to DE59402299T priority patent/DE59402299D1/de
Publication of EP0668598A1 publication Critical patent/EP0668598A1/fr
Application granted granted Critical
Publication of EP0668598B1 publication Critical patent/EP0668598B1/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
    • 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
    • H01F2038/305—Constructions with toroidal magnetic core

Definitions

  • the present invention relates to a toroidal current transformer for installation in a metal-encapsulated high-voltage switchgear assembly with at least one toroidal core provided in the encapsulation, with a primary conductor running in the opening of the toroidal core and with an inner tube arranged between the toroidal core and the primary conductor, one of which End electrically connected to the encapsulation and the other end is separated from the encapsulation by an electrically insulating gap and the remaining locations are electrically insulated from the encapsulation.
  • a toroidal current transformer of the type mentioned at the outset is known.
  • an inner tube which is guided in the opening of the ring core and which is electrically conductively connected to the encapsulation at one end, from forming a short-circuit winding which distorts the current transformer measurement, there is an electrically insulating gap between the other end of the inner tube and the encapsulation intended.
  • the total capacitance between the secondary winding and the encapsulation was increased in this arrangement.
  • traveling waves In metal-encapsulated high-voltage switchgear, apart from those caused by atmospheric discharges, steep traveling waves can also occur if a part of the system that represents a small capacitance is switched on or if a small capacitive current switches back or reignites. In these cases, a traveling wave arises that spreads on both sides from the point of origin of the switching arc and can have front times between 2 and 300 ns. After the inner tube ends freely, the traveling wave runs on the one hand in the primary conductor through the opening of the ring core and on the other hand in the encapsulation around the ring core. The traveling wave in the primary conductor induces a high overvoltage in the current transformer winding.
  • the length of the inner tube is usually in the order of magnitude of the front length of the traveling wave.
  • the reflected wave is capacitively coupled to the secondary winding and contributes to its potential increase.
  • both the level of the overvoltage induced in the secondary winding and the level of the potential increase in the secondary winding caused by capacitive coupling between the secondary winding and the inner tube can be limited.
  • the increase in capacitance between the secondary winding and the grounded encapsulation is achieved by a further additional winding applied to the toroidal core.
  • the additional winding is connected to the encapsulation, the other end is free.
  • the inductance of this additional winding has an adverse effect on steep traveling waves and reduces the desired effect of increasing the capacity. Due to the free end of the additional winding, high overvoltages can be injected into the secondary winding.
  • this arrangement forms an oscillatable structure that can be excited to resonate vibrations by the steep traveling waves.
  • the additional winding was composed of a plurality of open partial windings comprising only a short part of the toroid and connected in parallel with one another. This known toroidal current transformer is associated with a high economic outlay.
  • the object of the invention is to develop a toroidal current transformer of the type mentioned in the introduction, in which the increase in the capacitance between the secondary winding and the encapsulation can be achieved with economically advantageous means.
  • each wound toroid with its outer coaxial boundary surface is in contact with the inner surface of the encapsulation and each boundary surface extending transversely to the longitudinal axis of the primary conductor and not directly adjacent to the encapsulation of each wound toroid on an annular with the inner surface of the encapsulation electrically conductive connected, electrically conductive washer.
  • each boundary surface of the secondary windings of the toroidal cores which extends transversely to the longitudinal axis of the primary conductor, lies either directly on the encapsulation or on an annular disk which is electrically conductively connected to the inner surface of the encapsulation, further increases the capacity between the secondary winding and the encapsulation with simple Means.
  • Each ring disk can be provided on its outer circumference with a plurality of resilient contact pieces which are evenly distributed over the circumference and which abut the inner surface of the encapsulation. Such ring disks can simply be inserted into the encapsulation between the wound ring cores, which means that economic advantages can be achieved.
  • the boundary surface of the toroid most distant from the gap facing an annular core-free space facing away from the gap between the inner tube and the encapsulation is advantageously in contact with an annular disk furthest from the gap, which is connected to both the inner surface of the encapsulation and the inner tube is electrically connected.
  • the toroid-free space in the encapsulation can be bridged and the inductance of the path leading through the encapsulation can be reduced for steep traveling waves.
  • the overvoltages caused by steep traveling waves in the encapsulation around the toroidal cores are thus also reduced.
  • the annular disk furthest from the gap is advantageously provided both on its outer circumference and on its inner circumference with a plurality of resilient contact pieces which are evenly distributed over these circumferences and which are in contact with the outside of the inner surface of the encapsulation and the inside of the inner tube.
  • the ring disk provided with contact pieces in this way allows a simple and economically advantageous assembly of the current transformer.
  • FIG. 1 shows a toroidal core current transformer with three toroidal cores 4, 5, 6 provided with secondary windings 1, 2, 3 in section.
  • a primary conductor 7 intended for guiding the operating current runs in the opening of the ring cores 4, 5, 6.
  • the ring core current transformer is provided for installation in a metal-encapsulated high-voltage switchgear assembly (not shown in the figures).
  • the primary conductor 7 is guided in a tightly closed compressed gas space 8 filled with an insulating gas, for example SF 6 .
  • the toroidal cores 4, 5, 6 are accommodated in an outer metal encapsulation 9, which is electrically conductively connected to the remaining metal encapsulation, not shown, of the high-voltage switchgear assembly.
  • the outer encapsulation 9 is connected to an encapsulation 10 which is also electrically conductively connected to the metal encapsulation of the high-voltage switchgear.
  • the encapsulation 10 carries an inner tube 11, which is connected to it in an electrically conductive manner and projects into the opening of the toroidal cores 4, 5, 6.
  • the inner tube 11 is only electrically conductively connected to the encapsulation 10 at one end, at the other locations it is electrically insulated from it and from the other encapsulation parts. With its end facing away from the electrical connection point between the inner tube 11 and the encapsulation 10, the inner tube 11 lies gas-tight on a sealing ring 12 inserted in the outer encapsulation 9.
  • a centering ring 13 made of an electrically insulating material guides the inner tube 11 in the outer encapsulation 9.
  • the interior of the outer encapsulation 9, which accommodates the ring cores 4, 5, 6, is filled with air.
  • the electrically isolating gap 14 present between the end region of the inner tube 11 and the outer encapsulation 9 facing away from the electrical connection point between the encapsulation 10 and the inner tube 11 prevents the outer encapsulation 9 together with the encapsulation 10 adjoining it and the inner tube 11 forms a short circuit turn falsifying the current transformer measurement.
  • Each wound toroidal core 4, 5, 6 lies with its outer, coaxial boundary surface against the inner surface of the encapsulation 9. This measure achieves an increase in the capacitance with simple means between the adjacent part of the secondary winding 1, 2, 3 and the encapsulation 9.
  • These ring disks 15, 16, 17 increase the capacitance between the boundary surfaces of the secondary windings 1, 2, 3 and the encapsulation 9 which are transverse to the primary conductor 7.
  • the one boundary surface of the secondary winding 3 of the toroidal core 6 closest to the gap 14 is in direct contact with the encapsulation 9 .
  • Each washer 15, 16, 17 is provided on its outer circumference with a plurality of resilient contact pieces 18, 19, 20 which are evenly distributed on the circumference and which abut the inner surface of the encapsulation 9.
  • These ring disks 15, 16, 17 can be inserted into the outer encapsulation 9 between the wound ring cores 4, 5, 6.
  • the wound ring cores 4, 5, 6 and the ring disks 15, 16, 17 lying on them laterally are held in the outer encapsulation 9 by a plurality of electrically insulating tapes 21, which are evenly distributed around the circumference and fastened to the encapsulation 9.
  • Fig. 2 shows a further variant of the toroidal current transformer in section.
  • the parts which are identical in FIGS. 1 and 2 have the same reference numbers in the two FIGS. 1 and 2.
  • toroid-free space 25 is electrically closed by the washer 22.
  • the annular core-free space 25 lies between the boundary surface of the toroidal core 4 that is furthest from the gap 14 and the encapsulation 9, 10. This interspace 25 arises when the desired toroidal cores 4, 5, 6 are not all in one encapsulation that is uniform for all current transformers 9, 10 fill in the available space.
  • the part of the encapsulation 9, 10 guided around this intermediate space 25 means an additional inductance for the path of steep traveling waves, which is not caused by the desired current transformer.
  • the washer 22 electrically connects the encapsulation 9 to the inner tube 11 directly at the boundary surface of the ring core 4 that is most distant from the gap 14.
  • the steep traveling waves use this connection through the washer 22 Inductance leads to a reduction in the overvoltages caused by steep traveling waves.
  • the annular disk 22 which is the most distant from the gap 14 is provided, according to FIG. 2, with resilient contact pieces 23 and 24 both on its outer and on its inner circumference.
  • the evenly distributed on the inner circumference of this washer 22 contact pieces 23 are on the inner tube 11.
  • the contact pieces 24, which are evenly distributed on the outer circumference of the annular disk 22, ensure the electrical connection of the annular disk 22 to the outer encapsulation 9.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
EP94102403A 1994-02-17 1994-02-17 Transformateur de courant à noyau annulaire destiné à être monté dans une installation de commutation à haute tension encapsulée en métal Expired - Lifetime EP0668598B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT94102403T ATE151195T1 (de) 1994-02-17 1994-02-17 Ringkernstromwandler zum einbau in eine metallgekapselte hochspannungsschaltanlage
EP94102403A EP0668598B1 (fr) 1994-02-17 1994-02-17 Transformateur de courant à noyau annulaire destiné à être monté dans une installation de commutation à haute tension encapsulée en métal
DE59402299T DE59402299D1 (de) 1994-02-17 1994-02-17 Ringkernstromwandler zum Einbau in eine metallgekapselte Hochspannungsschaltanlage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94102403A EP0668598B1 (fr) 1994-02-17 1994-02-17 Transformateur de courant à noyau annulaire destiné à être monté dans une installation de commutation à haute tension encapsulée en métal

Publications (2)

Publication Number Publication Date
EP0668598A1 true EP0668598A1 (fr) 1995-08-23
EP0668598B1 EP0668598B1 (fr) 1997-04-02

Family

ID=8215695

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94102403A Expired - Lifetime EP0668598B1 (fr) 1994-02-17 1994-02-17 Transformateur de courant à noyau annulaire destiné à être monté dans une installation de commutation à haute tension encapsulée en métal

Country Status (3)

Country Link
EP (1) EP0668598B1 (fr)
AT (1) ATE151195T1 (fr)
DE (1) DE59402299D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19635749A1 (de) * 1996-09-03 1998-04-09 Siemens Ag Meßwandler
ES2118038A1 (es) * 1996-06-13 1998-09-01 Abb Subestaciones S A Transformador de intensidad aislado en hexafloruro de azufre, integrado en un interruptor de alta tension.
WO2012076334A1 (fr) * 2010-12-08 2012-06-14 Siemens Aktiengesellschaft Module transformateur de courant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2720689A1 (de) * 1977-05-07 1978-11-09 Calor Emag Elektrizitaets Ag Einleiter - durchfuehrungsstromwandler
DE3247383A1 (de) * 1982-12-10 1984-06-14 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Stromwandler
EP0229220A1 (fr) * 1985-10-09 1987-07-22 Sprecher Energie AG Transformateur d'intensité
WO1992015104A1 (fr) 1991-02-22 1992-09-03 Siemens Aktiengesellschaft Trasformateur d'intensite

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2720689A1 (de) * 1977-05-07 1978-11-09 Calor Emag Elektrizitaets Ag Einleiter - durchfuehrungsstromwandler
DE3247383A1 (de) * 1982-12-10 1984-06-14 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Stromwandler
EP0229220A1 (fr) * 1985-10-09 1987-07-22 Sprecher Energie AG Transformateur d'intensité
WO1992015104A1 (fr) 1991-02-22 1992-09-03 Siemens Aktiengesellschaft Trasformateur d'intensite

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2118038A1 (es) * 1996-06-13 1998-09-01 Abb Subestaciones S A Transformador de intensidad aislado en hexafloruro de azufre, integrado en un interruptor de alta tension.
DE19635749A1 (de) * 1996-09-03 1998-04-09 Siemens Ag Meßwandler
DE19635749C2 (de) * 1996-09-03 1999-05-06 Siemens Ag Meßwandler
WO2012076334A1 (fr) * 2010-12-08 2012-06-14 Siemens Aktiengesellschaft Module transformateur de courant

Also Published As

Publication number Publication date
DE59402299D1 (de) 1997-05-07
ATE151195T1 (de) 1997-04-15
EP0668598B1 (fr) 1997-04-02

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