EP0746002A2 - Transformateur de courant pour un réseau d'alimentation électrique à haute tension - Google Patents
Transformateur de courant pour un réseau d'alimentation électrique à haute tension Download PDFInfo
- Publication number
- EP0746002A2 EP0746002A2 EP96108463A EP96108463A EP0746002A2 EP 0746002 A2 EP0746002 A2 EP 0746002A2 EP 96108463 A EP96108463 A EP 96108463A EP 96108463 A EP96108463 A EP 96108463A EP 0746002 A2 EP0746002 A2 EP 0746002A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- transformer
- insulating
- fact
- tube
- transformer according
- 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
Links
- 238000005259 measurement Methods 0.000 title claims abstract description 4
- 238000004804 winding Methods 0.000 claims abstract description 17
- 230000005684 electric field Effects 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000012528 membrane Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 8
- 229910052573 porcelain Inorganic materials 0.000 claims description 8
- 239000011152 fibreglass Substances 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 3
- 206010052428 Wound Diseases 0.000 claims 1
- 208000027418 Wounds and injury Diseases 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 239000011796 hollow space material Substances 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 230000036961 partial effect Effects 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 230000000930 thermomechanical effect Effects 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
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 instant invention relates to a transformer for the measurement of current in high- voltage supply networks.
- This kind of instruments is inserted in the medium-voltage (M.V.) or high-voltage (H.V.) lines within the substations for the generation and distribution of electricity in order to supply low-voltage current proportional to the current circulating in the high-voltage line by means of a static transforming device the primary winding of which is constituted by one of the conductors of the distribution line while the secondary windings, duly insulated, are constituted by coils wound on magnetic cores.
- M.V. medium-voltage
- H.V. high-voltage
- Said coils at their end are provided with terminals arranged at the base of the transformer to which terminals the individual consumer can connect himself for receiving the low-voltage signals necessary for measuring the line current and for protecting the line itself.
- the insulation between the primary and the secondary, at the present state of the art, is realized through an insulating means which may consist of paper or a film of plastic material impregnated with insulating fluids or of an insulating gas, generally SF6 which is in overpressure with respect to the atmospheric pressure.
- an insulating means which may consist of paper or a film of plastic material impregnated with insulating fluids or of an insulating gas, generally SF6 which is in overpressure with respect to the atmospheric pressure.
- the transformer disclosed herein is of the pressurized gas type.
- Fig.1 is a schematic illustration of the operative insertion of an instrument transformer for measuring the electrical current including, according to the conventional construction, a base 1 to which is linked a porcelain insulating body 2 which supports a head 3 wherein are arranged the elements of the transformer.
- the primary winding consists of one of the conductors of the line itself, e.g. a three-phase line 5 wherein a high-voltage current circulates.
- the secondary windings are wound on magnetic cores 6 assembled within a shell 7, said cores as a whole forming a ring surrounding the conductor 4.
- the ring formed by the magnetic cores 6 is generally supported by an insulating bell 8.
- annular shields e.g. as the one bearing the reference numeral 11, useful for a better distribution of the internal electrical field.
- a safety membrane 12 On top of the head 3 is, in many instances, arranged a safety membrane 12 forming a weakening point for the rupture of the structure which acts as a vent in case of a sudden overpressure due to an internal short-circuit.
- Object of the present invention is that of realizing a current transformer for high-voltage networks more reliable with regard to the above mentioned drawbacks and also of a more simple and hence more economic design.
- the annular shell compacting the magnetic cores is supported from below by a metal tube directly fixed to the base of the transformer while at its upper part the shell is fixed to an insulating element which is coaxial to said metal tube.
- the upper end of the insulating element is slidingly centered on a flange, arranged on the base of the safety membrane, thereby attaining a stable transversal centering of the entire unit at the extremities of the supporting shell of the magnetic cores, which proves to be advantageous both during operation and during the transportation of the current transformer.
- Said sleeve-magnetic-cores-tube supporting assembly is kept under tension by at least one cup-shaped spring provided between the end of the insulating tube and said spoke flange so as to automatically compensate longitudinal expansions.
- any other way of transversal centering as well as the adoption of supporting bells of the magnetic cores is eliminated, thereby simplifying the design and the assembly of the transformer, the head whereof proves therefore to be shorter, with the advantage of lower weight and lower cost.
- the lower part of the spoke flange supporting the upper insulating tube presents a ring-shaped projection constituting an electrode facing a second electrode engaged at the point of attachment between the upper insulating tube and the shell of the magnetic cores.
- a preferential discharge area is created, shifted towards the weakest point of the electrical insulation in the terminal portion of the transformer's head, viz. in the neighbourhood of the safety membrane.
- the safety membrane timely gives way, thereby avoiding the burst of the transformer,thus safeguarding its integrity as well as that of the persons and objects in its surroundings.
- an intermediate shield to improve the electrical field consisting of a metal electrode, appended to an insulating supporting tube fixed to the shell of the cores, which electrode is interposed between a conventional electric shield fixed on the flange and the supporting central tube.
- an intermediate shield is foreseen for high voltages, such as in the area of 245 kV, for conveying and dividing, in an optimal way, the equipotential lines of the internal electrical field in order to avoid discharges along the insulating body.
- a winding of insulating material such as a film of polypropylene or of other insulating plastic materials, amongst the turns of which winding there is provided the insertion of conducting or semiconducting foils such as to constitute a capacitance graded bushing.
- This bushing allows a better distribution of the electrical field under the transformer head which constitutes the most critical area as well as in the insulating gas channel leading to said head.
- the capacity of the capacitance graded bushing is calculated so as to obtain a value equivalent to the capacity between the central supporting tube and the intermediate shield, which is elongated beyond the lower end of the bushing itself, for a controlled voltage distribution.
- the intermediate shields can be more than one and the condenser winding is made on the outermost one.
- the inventive transformer for measuring currents in high-voltage networks is of the pressurized gas insulation type and includes a base 1 to which a porcelain insulating body 2 is fixed, supporting the head 30, through which passes the conductor 4, in which head are contained the elements of the transformer.
- the magnetic cores 6 are fitted and compacted within a shell 7 supported below by a central metal tube 20 directly fixed onto base 1.
- a central metal tube 20 directly fixed onto base 1.
- an insulating tube 22 e.g. made of fiberglass reinforced plastic material, which passes slidingly at the centre of a bored flange 24 above which are arranged cup-shaped springs 26 which are opposed to a blocking element 27 which is located at the end of the insulating tube 22.
- the bored flange 24 allows the passage of the insulating pressurized gas into the chamber 13 closed by the safety membrane 14.
- the elastic tension of the assembly (22, 7, 20) can be appropriately adjusted so as to automatically compensate the longitudinal thermal expansions.
- the shell 7 and its magnetic cores 6 remain transversally centered, thus avoiding the need for insulating bells which cause drawbacks of a dimensional nature, the possible deposit of impurities which substantially weaken the superficial electric insulation and which contribute to preventing a rapid venting of the overpressure from the inside of the insulating body 2 towards the head of the transformer in case of a short circuit.
- the lower part of the bored flange 24 presents an annular projection 28 constituting an upper electrode which lies opposite to a lower electrode 29 fitted onto the insulating tube 22 at the engaging point of the latter with shell 7 of the magnetic cores.
- Said arrangement of the electrodes 28 and 29 forms a preferential reaction point for a possible internal discharge which can thus occur in the immediate vicinity of the breakable safety membrane 14 in order to allow an immediate venting of the overpressure, thus avoiding the explosion of the insulating body 2.
- a conventional grading shield 11 is provided. This is applied at the flange 32 between the insulating body 2 and the head 30 of the transformer.
- FIG.4 is illustrated, on an enlarged scale, another embodiment of the invention which besides the elements described in Fig.3 includes additional elements.
- an intermediate shield 36 made of a metal tube, provided with conventional rings 37 suitable for conveniently distributing the electric field.
- the intermediate shield 36 is appended by means of an insulating tube 38 to the metallic shell 7 in order to be concentric with the supporting metal tube 20.
- the tubular supporting element 38 is suitably bored in order to allow a correct passage of the insulating gas along the hollow space between the supporting central tube 20 and the inner wall of the porcelain insulating body 2, within which hollow space said intermediate screen 36 is then arranged.
- a protecting tube 40 is provided generally made of fiberglass reinforced plastic material, adhering to the inner wall of the insulating body 2 in order to avoid dangerous thermo-mechanical stresses in case of an internal discharge.
- FIG.5 A further embodiment is illustrated in Fig.5.
- the insulating space inside the insulating container is subdivided into two parts in order to avoid the use of a complete capacitance bushing distribution, as adopted in certain prior art embodiments, which demands the construction of a gas impregnated bushing element of considerable weight and size constituting an economical and technical burden as a result of a more difficult impregnation of the insulating wrapping,
- a first part, formed by the zone lying within the central metal tube 20 and the intermediate shield 36 is insulated by means of a gas whereas the second part consists essentially of a capacitance graded bushing 45 of limited dimensions which however allows a good distribution of the electric field in that part which usually is more stressed.
- the bushing 45 tied to the intermediate shield 36 is made up by a winding made of an insulating material such as a film of polypropylene or other plastic material within the turns of which are inserted conducting or semiconducting foils so as to form a capacitance graded bushing which allows a good distribution of the electric field in the highest zone 48 of the insulating body 2, i.e. immediately below the head 30, as well as within opening 31 forming a channel for the insulating gas which leads to said head.
- the intermediate shield 36 is extended downwards beyond the lowest edge of the capacitance graded bushing 45.
- the percent distribution of the voltage is computed considering the capacities resulting from the first gas insulated part and the second bushing part and relevant ratio. Also in this embodiment, for a better centering of the intermediate shield 36 and for mechanical safety reasons during transportation, use is made of insulating elements 42 applied between the protecting fiberglass tube 40 and the intermediate shield 36. Said elements are obviously placed in the lowest areas where the electric field is minimal.
- the intermediate shields could be more than two and the capacitance graded bushing will be tied only to the last one, where the longitudinal distribution of the electrical field is more critical.
- Said bushing can be made of windings of polypropylene sheets or similar dielectric plastic materials, or of paper, all impregnated with insulating gas.
- a further advantage of the windings of limited width is the fact that they can be made of a continuous winding without any, certainly less reliable, ribbon winding.
- circuits are of the electronic type, one can directly use a signal, otherwise, for a higher burden, one has to provide an amplifying circuit, e.g. when an electromagnetic circuit has to be energized.
- the porcelain body 2 can be replaced by a simple, possibly finned, insulating tube.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI951143A IT1275290B (it) | 1995-06-01 | 1995-06-01 | Trasformatore per misura di corrente in reti elettriche ad alta tensione |
| ITMI951143 | 1995-06-01 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0746002A2 true EP0746002A2 (fr) | 1996-12-04 |
| EP0746002A3 EP0746002A3 (fr) | 1997-03-12 |
| EP0746002B1 EP0746002B1 (fr) | 2000-06-14 |
Family
ID=11371724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96108463A Expired - Lifetime EP0746002B1 (fr) | 1995-06-01 | 1996-05-28 | Transformateur de courant pour un réseau d'alimentation électrique à haute tension |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0746002B1 (fr) |
| DE (1) | DE69608853T2 (fr) |
| IT (1) | IT1275290B (fr) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001038886A1 (fr) * | 1999-11-19 | 2001-05-31 | Siemens Aktiengesellschaft | Dispositif de conversion d'une grandeur electrique et utilisation de ce dispositif |
| CN102866281A (zh) * | 2012-09-03 | 2013-01-09 | 河南新月实业有限公司 | 高压线路用电流传感器 |
| CN103680906A (zh) * | 2013-12-13 | 2014-03-26 | 中国西电电气股份有限公司 | 一种特高压敞开式变电站电流互感器的绝缘结构 |
| CN102024557B (zh) * | 2009-09-21 | 2015-09-16 | 江苏思源赫兹互感器有限公司 | 电子式电流互感器 |
| CN105225816A (zh) * | 2015-10-21 | 2016-01-06 | 中国电力科学研究院 | 一种具有高压标准电容器功能的电流互感器 |
| CN113899936A (zh) * | 2021-10-13 | 2022-01-07 | 中国电力科学研究院有限公司 | 一种电磁式电流互感器 |
| EP3979267A1 (fr) * | 2020-09-30 | 2022-04-06 | Hitachi Energy Switzerland AG | Traversée électrique et procédé de production d'une traversée électrique |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1488299A1 (de) * | 1963-03-22 | 1969-04-10 | Siemens Ag | Hochspannungsstromwandler |
| DE3230091A1 (de) * | 1982-07-19 | 1984-01-19 | BBC Aktiengesellschaft Brown, Boveri & Cie., 5401 Baden, Aargau | Druckgasisolierter stromwandler |
| EP0236974A2 (fr) * | 1986-03-13 | 1987-09-16 | Mwb Messwandler-Bau Ag | Transformateur de courant et de tension combiné pour une installation de haute tension |
| US4775849A (en) * | 1987-12-24 | 1988-10-04 | Guthrie Canadian Investments Limited | Gas insulated current transformer |
-
1995
- 1995-06-01 IT ITMI951143A patent/IT1275290B/it active IP Right Grant
-
1996
- 1996-05-28 EP EP96108463A patent/EP0746002B1/fr not_active Expired - Lifetime
- 1996-05-28 DE DE69608853T patent/DE69608853T2/de not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1488299A1 (de) * | 1963-03-22 | 1969-04-10 | Siemens Ag | Hochspannungsstromwandler |
| DE3230091A1 (de) * | 1982-07-19 | 1984-01-19 | BBC Aktiengesellschaft Brown, Boveri & Cie., 5401 Baden, Aargau | Druckgasisolierter stromwandler |
| EP0236974A2 (fr) * | 1986-03-13 | 1987-09-16 | Mwb Messwandler-Bau Ag | Transformateur de courant et de tension combiné pour une installation de haute tension |
| US4775849A (en) * | 1987-12-24 | 1988-10-04 | Guthrie Canadian Investments Limited | Gas insulated current transformer |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001038886A1 (fr) * | 1999-11-19 | 2001-05-31 | Siemens Aktiengesellschaft | Dispositif de conversion d'une grandeur electrique et utilisation de ce dispositif |
| CN102024557B (zh) * | 2009-09-21 | 2015-09-16 | 江苏思源赫兹互感器有限公司 | 电子式电流互感器 |
| CN102866281A (zh) * | 2012-09-03 | 2013-01-09 | 河南新月实业有限公司 | 高压线路用电流传感器 |
| CN103680906A (zh) * | 2013-12-13 | 2014-03-26 | 中国西电电气股份有限公司 | 一种特高压敞开式变电站电流互感器的绝缘结构 |
| CN105225816A (zh) * | 2015-10-21 | 2016-01-06 | 中国电力科学研究院 | 一种具有高压标准电容器功能的电流互感器 |
| EP3979267A1 (fr) * | 2020-09-30 | 2022-04-06 | Hitachi Energy Switzerland AG | Traversée électrique et procédé de production d'une traversée électrique |
| US11881330B2 (en) | 2020-09-30 | 2024-01-23 | Hitachi Energy Ltd | Electrical bushing and methods of producing an electrical bushing |
| CN113899936A (zh) * | 2021-10-13 | 2022-01-07 | 中国电力科学研究院有限公司 | 一种电磁式电流互感器 |
| CN113899936B (zh) * | 2021-10-13 | 2024-05-03 | 中国电力科学研究院有限公司 | 一种电磁式电流互感器 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0746002A3 (fr) | 1997-03-12 |
| IT1275290B (it) | 1997-08-05 |
| ITMI951143A1 (it) | 1996-12-01 |
| ITMI951143A0 (it) | 1995-06-01 |
| DE69608853T2 (de) | 2000-11-30 |
| DE69608853D1 (de) | 2000-07-20 |
| EP0746002B1 (fr) | 2000-06-14 |
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