DE1613798A1 - High voltage current transformer - Google Patents

Description

High savings power converter

The invention "relates to a high-voltage current transformer having mounted on a base hollow Isölatorsäule on which a dar high voltage line by modifying the container is arranged, which in its interior contains a high-voltage wire surrounding at a distance from the secondary winding.

Most high voltage current transformers are on an insulating column attached to isolate the high voltage parts of the / andler from earth. Such "insulator columns must be designed in such a way that they are great mechanical Withstand forces, e.g. from internal tension, cable pull, heavy ice formation or high wind speeds originate. Since many insulation materials only behave

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Withstanding small tensions, facilities have already been established suggested to preload the isolator column to make it suitable for absorbing these high loads is.

Known devices to put a 'bias' on the isolator column to apply are relatively expensive and take up a lot of space, so that an enlargement of the insulator column is required to pretension the devices to accommodate in it.

The invention is based on the object of a high-voltage current converter to create with the relatively easy. and cheap parts can be used to make the isolator column prestressing without thereby a substantial increase in the number of parts receiving the parts required for the prestressing Isolator column is required.

This object is essentially achieved in that by the interior of the isolator column from the base to the container tubularly fastened to the container and base with clamps. Tensioning tab made of metal, and that the opannstab a tensile stress can be applied to generate a prestress in the insulator column.

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Sine "for example. Embodiment of the invention; 1st in the drawing, shown s divided; it shows: - ^; ■■

Fig. 1 is a side view of a high-voltage current transformer according to the invention; ν -

Fig. 2 an enlarged section through the high-voltage converter: according to Fig. ",..... ■

In Figure 1, a high-voltage current selector is shown.,; at to which a hollow insulator column Ί2. attached on a base 1O which is preferably made of porcelain ;. A metal container 14 is attached to the upper end of the insulator column 12- which contains an opening 16 which is substantially aligned with the interior of the insulator column 12. The base 'ΰ is normally at earth potential, whereas the container ■ 4 is normally under high voltage. The isolator column 2 serves to electrically isolate the container Ί4 from the base / O and against other "parts located in the · \ lahe :, the to earth potential or a potential in the vicinity of the earth potential lie. The container 14 shown consists of two parts'! 4a and 14b, which by a horizontally lying Flange connection 17 are screwed together. · ... ".

The container 14, the IsoTatoräule 12 and the base are OK with the help of a tubular tie rod 18, which is preferred made of steel, held together under pressure. The tie rod 18 extends from a point within the container 14

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the center of the hollow isolator column 12 down to a point near the base. The holder 22 in turn rests on the upper end of a tubular insulator 24-. The tubular insulator 24 surrounds the tie rod 18 and is essentially aligned with the insulator column .2. The lower end of the tubular insulator 24- rests on part of the container 14-. The tensile stress applied to the tension rod 8 in the area of the lower end acts on the parts 18, 20 and 22 as well as the insulator 24 and clamps the container 14, the insulator column 2 and the base 10 against each other. Suitable seals 26 are attached between parts "4, 12 and -0 in order to ensure a pressure-tight fit of the waist to one another.

A row of bolts 2> 0 are attached to the tie rod 18 and run around the lower end of the tie rod at a certain distance from one another. These bolts are fastened in the base ^'1 O and are provided at the upper end with a thread-auf'welches a nut is screwed 52nd The bolts 30 protrude through openings in a flange 34 which is welded to the tie rod S or fastened in some other way. Between the flange 34 and the "nut 32" a stack of spring washers or spring washers 36 are provided on the bolt 30, which in the illustration according to FIG.

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seed bias are shown compressed. Through the The spring action of the spring washers 36 is achieved via the flange 34 tensile stress is applied to the tie rod "8.

For fine adjustment of the force applied by the spring discs 36 to the tie rod tension of the adjustable flange 20 is provided ^Λ 18 at the upper end of the tension rod. The flange 20 consists of a nut which is screwed onto the upper end of the tension rod 18. Through the feed, that is, by the screwing of the flange 20, the effective length of the tensioning rod ^ ^r; shortened 8, so that the spring discs are züsammengejjreßt stronger 36, with * the flange 20 can thus be ■ the tension tab on the instep ,, '18 to adjust.

When assembling the current transformer ¹ , the tie rod /: 8, onto which the flange 20 is not yet screwed, is first mounted on "the base" 10. Since the insulator column 12 has not yet been put in place in this state, the nuts 32 can be adjusted in a ^{suitable manner on the bolts:} the insulator column 12 is then slipped over the tie rod and placed on the base . Hachdem the parts _14b; 24 and 22 are attached to the upper end of the Isölaforsäule 12, the adjustable flange 20 is screwed onto the tensioning rod, which now presses the spring washers 36 in an oblique manner by tightening the flange 20 accordingly. _: ;

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The primary winding of the current transformer consists of a rod 40 which is preferably made of a highly conductive material such as copper or aluminum. The rod 40 is connected in series with the high-voltage line 4 ″ and carries the power transmitted via the high-voltage line; it runs in the horizontal direction through the container ^Λ and protrudes beyond it attached flange 42. This flap 4-2 is suitably attached to the container, with a seal 45 being provided between the flange and the container to ensure a gas- and pressure-tight seal Flange 42 is an electrical connection, which is shown schematically by the line 44. In addition to this electrical connection in the region of the flange 42, the container ^ 4 is insulated from the conductor 40. Through the electrical connection 44, the container 14 is at the same high voltage potential as the dtab 40, which forms the primary side of the handler, is held.

The right-hand end of the »rod 40 protrudes through the right one Uand of the container 14 and is insulated from this. One Nut 45 is screwed onto the right-hand end of rod 40 and bears against a seal 46 disposed between the container wall and the nut 45. These Seal 46 isolates the right-hand end of .Jtabes 40

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against the container "^ and simultaneously causes a pressure served closure of the container 14. In the illustrated ^ CiZζ guidance £ form of 3ii J = l ~ is on the rod 40 on the inside;?. 3RS a lock nut .48 and mounted another. '-iich. ~ vxL% 49 between this' counter nut and the container wall -rozc-geGshea. In this arrangement, the container wall is pinched between the compressed seals sn 46 and 49 when the nut4-5 is removed *. - ^:.

In the illustrated imsführungsform the invention are for the current transformer is provided within the container 14 - two secondary windings * 5ö and 5.2. It is obvious. That any number of iron turns followed. Usage type the current transformer can be provided. Each of the secondary windings 50 and 52 are constructed in a conventional manner i.e. * wound around a toroidal core 5 ^, which is the primary winding serving rod 40 includes. The turns of these windings are electrically isolated from the Eex-n in the usual way. The cores 54 lie exactly like one end of the respective secondary winding at ground potential * The house located within the magnetic core 54- is hereinafter referred to as the! window the current transformer secondary side. :

The secondary windings 50 and 52 are grounded with one Met all shielding 60, which electrostatically shield the windings and see a concentration of the dielectric

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Prevent stress in the area of the irregular surfaces. The metal shield 60 is basically constructed in the shape of a ring and has smooth outer surfaces around which. To reduce stress concentration. Preferably, the Me tall shielding 60 is made up of two half-shell shaped hangers which are attached to the puddle 22 in a suitable manner. A suitable insulation 59 i- ^ ~ ^s provided between the two parts of the metal shield 60 to prevent the shield Me represents a tall 60 extending around the cores 54- shorted.

The metal shield 60 and the windings 59 ' ^{in the} d 52 are essentially at ground potential. However, suitable electrical insulation 64 is provided to further isolate metal shield 60 from the secondary windings. The secondary windings 50 and 52 together with the metal shield 60 form a unitary structural element which is fastened in a suitable manner to the flange 22 and is held by the latter on the tubular insulator 24.

In the illustrated embodiment, the windings 50 and 52 and the metal shield 60 with a U-shaped bent part 61 attached to flange 22. The ΤΓ-shaped curved one Part 61 runs along a portion of the cores 54. The windings 50 and 52 are suitably provided with connected to the part 61, to which the laterally protruding

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sets 62 are welded on. With through the sowing they 62 ver ■ "\ running screws 63 can be the U-j-shaped bent part 61, the metal shield 60 and the flange 22 firmly with- - "■ * · get jammed together. . ''

After the parts 50 and 52 and 60 to 63 on the splash 22, the upper part 14a of the container 14 is mounted on the lower part 14b. After that, the rod 40 with the cap 42 attached from the left side introduced into the container 14 and by the Senate of the Windings 50 and 52 inserted. After the rod on the opposite Page is fixed in a suitable manner, the assembly of the high-voltage current transformer is completed.

The tie rod 18 is designed as an Eohr, through the interior of which the lines 66 to the secondary windings run. The lines 66 are insulated in a suitable manner and protrude beyond the upper end of the hollow tie rod 18. They are inserted through the base plate of the high-voltage current selector from below through an opening which is closed by a suitable cover 6 ^;

To isolate the parts 60, 18 and 22 against the high potential rod 40 and Container ί 4 is a suitable ionizing gas in an ilen container ter 14 and the interior of the hollow "Iöolatörsäie 12 elnge-"

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leads. A suitable gas is sulfur hexafluoride, which under several atmospheres of pressure. Since the parts 60, 18 and 22 which are at ground potential are spatially different from those at high potential lying parts are separated, the gaseous insulation provides the necessary dielectric strength between them Share achieved so that under normal conditions a Breakdown or flashover within the structure of the high-voltage current transformer is prevented. Due to the pressure-tight Connections on all parts of the structure will leak prevented so that the gas pressure can be maintained within the structure. Although in the described Embodiment a gaseous insulator is used, the inside of the superstructure can also be covered with a liquid insulator be filled.

To further influence the electrostatic field and to prevent undesired concentrations, shields 70 " ⁰²¹ A 72 are also provided. The shield 70 consists of a tubular metal part which surrounds the tie rod 18 at a certain distance in the upper region of the insulator column 12. This shield is electrical The other shield 72 is in the form of a cup and surrounds the bolts 30 and nuts 32 at the lower end of the structure. The shield 72 is at ground potential and is preferably supported by the lower flange 34 to which it is electrically connected *

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As already stated ■ ',. The insulator column '"■ 2 of the Hochspajrimmgs-Stromwandler must be able to withstand large mechanical forces that are exerted on the arrangement by a high internal pressure or due to high wind speeds or heavy iron due to the The high-voltage conductors W \ attached to the rod 40 are effective on the arrangement. By these forces, the isolator column 12 is exposed to tension. such loads can become problematic. In order to withstand high loads safely, it has already been proposed to apply a gate voltage to the isolator column which counteracts this load component.; - .- ■; - ": - ■ ^{; ::} . . "■■" ■ - ": ■

The well-known devices used for this purpose consist in Hegel of a series of. insulated rods attached at a distance next to one another and running through the interior between the two ends of the insulator column. One such arrangement is. Not only expensive, but also relatively complicated and requires so much hem that usually an enlargement of the insulator column IE is necessary in order to accommodate the arrangement inside with the necessary safety clearances. V \ "., · .; V "-'-.- ■". ■■■ '' - ■;. ■ "

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By having the features of the invention, the need becomes such insulating rods eliminated by using a central tubular tie rod 18 with which the necessary Bias can be applied to the insulator column 12. The tie rod 18 is in contrast to the known insulating rods made of Metair and can consist of a cheap metal, such as steel, with high tensile strength, since it does not have to transmit any electricity. This makes it possible to introduce high voltages across the tension rod, though this has only a relatively small cross section.

Even with a high-voltage current transformer in which there is no tie rod is provided, a suitable pipe must be available inside the isolator column, which the supply lines 66 to the secondary windings. Since the tie rod 18 is hollow, it can also be used for this function at the same time be used. The tie rod 18 is thus able to apply the required prestress to the insulator column without taking up more space as a pipeline which is only intended to accommodate the supply lines. As for the tie rod 18 only a relatively small diameter is required, an insulator column 12 with a relatively small diameter can also be used Find use and still have the necessary electrical Keep a safe distance.

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Since the distance does not have to carry a primary current, his. length or its diameter of the size of the primary current not "influenced. A live part is exposed to heat due to the cattle changing currents an expansion and a contraction that im A substantially constant length of the tie rod 18 has an advantage in that the spring washers 36 can be constructed more simply and a more uniform preload on the Isölatorsäule 12 regardless of the size of the Primary current can be applied. Would the tie rod 18 are appreciably lengthened as a function of a high current, then the spring disks 36 applied preload decrease in a way that requires compensation. -

It should also be noted that the cross section of the tie rod 18, since it carries no current, can be dimensioned independently of the conductivity vienn, on the other hand, the cross-section under "consideration of a Power supply dimensioned would have to xierden - then were for large currents require relatively large cross-sections, which also increase the cross-section of the insulator column to have xfiirde. Since such a vStom-dependent ^ cross-section determination for the tie rod 18 is omitted, can even for I-hole voltage current transformers with a ratio of ^ " Moderate primary current tie rods of small diameter can be used. , BAD ORIGINAL

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It should also be pointed out that the tubular insulator 24 is essential for maintaining the prestress in the insulator column 12, since the tubular insulator transfers the tensioning forces from the tension rod 18 to the insulator column 12. The purpose of the insulator 24 is to maintain a sufficiently large constant distance between the parts carrying high voltage and the parts which are at ground potential, regardless of the mechanical forces acting on these parts. In this regard, the insulator 24 is fixed the upper end of the tension rod 18 and prevents a radial displacement thereof relative to the container 14. At the same time the parts 5O ₅ 52 and 60 of the secondary side are compared to the the primärseitxgen current-carrying rod 40 in both the axial direction and fixed in the radial direction. Finally, the tubular insulator 24 is used to hold the secondary arrangement made up of parts 50, 52 and 60. Thus, no further insulators are required for the support, thus eliminating the cost of further insulators and avoiding further breakdown paths inside the container 14.

Patent claims

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Claims (5)

Patent claims 1. High voltage current transformer with one mounted on a base hollow insulator pillar on which one of the power lines interspersed container is arranged, which in its interior a the high-voltage line at a distance surrounding secondary winding, characterized in that through the interior of the insulator column from the base to the container a tubular am Container and the base with a Torspannanordnung attached tie rod extends from metal, and that the tie rod to A tensile stress can be applied to generate a prestress in the insulator column. 2. High-voltage current transformer according to claim 1, characterized in that the container has one on the interior the isolator column has aligned opening. and a tubular one aligned with the insulator column Contains an insulator that supports the secondary winding structure, and that the tubular tension rod extends through the insulator column and the tubular insulator and the prestressing at the top of the tubular insulator. 109819/0177 IbI3798 3. HochspannuJigs current transformer according to claim 1, characterized g e k e η η ζ e rejects that the pre-tensioning order at the bottom Has the end of the insulator column attached spring elements that Apply tension to the tension rod. 4-. High-voltage current converter according to claim. 3? characterized in that at the upper end of the öpannstabs to change the preload applied by the spring elements Einteilglieder are provided, and that by the Adjusting elements, the effective length of the; 3paniistab can be changed is. 5. High-voltage Stromxfandler according to one or more of the claims '' to 4, characterized in that the container and the isolator column are under overpressure contain standing insulating gas filling, and that the supply lines for the secondary winding arrangement be guided through the tubular tie rod to the vicinity of the lower end of the isolator column. BATH ORIGINAL 1098 1 9 / -n 1-7 7 Blank page