DE7204896U - PRIMARY SIDE SWITCHABLE CURRENT CONVERTER - Google Patents

Description

SIEIENS ASDIENGESSIISOHAFT Erlangen, February 7, 1972 Berlin and Munich Werner-von-Siemens-Str. 50

Our reference: VPA 72/3710 Kr / Stζ

switchable ar current converter

The innovation relates to a switchable on the primary side Current transformer of high voltage and amperage with several windings surrounding the iron core and according to the Current ranges of decreasing conductor cross-section, with your for a wider one, opposite the current ranges of the windings largest current range an additional stretched conductor the window of the secondary system as a more compact, short one Staff interspersed.

In such a known current transformer (DT-AS 1 231 346) the windings consist of one or more conductors that are routed around the secondary system. The surge resistance of the known converter is therefore in the measuring ranges in which the windings are switched on, limited by the dynamic strength of the primary windings.

The innovation is based on the task To create a current transformer which can be switched on the primary side and which is not only suitable for the largest current range (e.g. switched-on rod or rod with one turn) is characterized by high dynamic strength, but

-2- Y? A 72/3710 '

which is also used for recording when the primary windings are switched on of currents in smaller Stromiae ranges one has high shock resistance.

To solve this problem, a switchable on the primary side is required Current transformers of the type described above are suitable, in which, according to the innovation, the secondary system of one metallic casing and / or is surrounded by a metallic housing like a hollow ring and in which the metallic Sheath or the housing one turn of the windings forms.

Although it is already known (DT-OS 1 563 435), with one high-voltage current transformer in Head construction su use the head housing as a connection, however, the known high-voltage current converter is only suitable for a 1: 2 switchover. The well-known high-voltage current transformer namely, apart from a short rod-shaped conductor, it has the purpose of detecting the highest currents and the housing as a further winding, no primary windings that are looking for sustenance on.

In the current transformer according to the invention, the metallic casing and / or the housing has an annular opening on one end face that encompasses the window of the secondary system and is closed with insulating material.

The housing of the current transformer according to the invention can with be filled with a gaseous or liquid insulating agent, the opening in the housing then closing off Insulating material consists of a gas- or liquid-tight fastened plate; the plate has recesses for passing through and holding the compact rod and the winding conductor of the windings.

_ · ^ _ ~ R ~ c! \ Τ? / ■ =; "71 η

~ 2> .τ Λ / .-: / j! IU

The U-nhüllung within the metallic or C ~ s "j ton rule housing befindliehe insulating han:... I also AUJ cast resin Confess In such PaIIe h.- · ■ :: Λί · 3 metallic sheath of one on den Cir: ";:; :: νΓ ;; ^ Γ ^ _ riuffjcti-aoliten IsifbelaiT g .- ^ oilaei: be. Gc / wcccüralls ΐ ·:; - ηη is carried out as yet nähor below - :: :: ^u: .c; Lioli "u c.ei: r.ä" L "C-llischen wrapping a Gie3harr: i. _'olicruxi: a no case be vorgeaeheii.

The \ iieklungen bz-v ?. whose v / iVidunsen V; ':. i \ nc = n "in the Repentance · approximately contemporary Strorvr./andler in different voise in 03i: ug to Geh'üi ^ e may be arranged as V: ^-:: o i appears .lhait it \ ^ erni "at a" .. ^r ic ': lung with a sinsicen turn this Viindung of de ^ ^ housing etildei; is because these \ 7icklung of all - au'or de: ·· Stac - v.-.--. ;; tö ?. ⁴ ; -? n current flows through, v; cim is a des ~ rsc :: cr.dc υ-. ϊθΐ: α1 - tung voi'genominen wcrdsn.

It can also be advantageous if there is a "·; ίο '.: 1νιη; -; r, u?: -.;: At least one within the metallic. U :: JiüIlu ^^ I-- ·. ■ ;. i: v- ! inside the case luscious Viiiuluiig and a weiLoio

V / ent from at least one IXU ^ erhalo the ^LV:.>: I unc b ^ .v ;.!

j. ".v ^ nduiv: and from one:

^! formed by deni housing v: -itorcn Vir.o.ur ^ - " ^L ? ht.

With a metallic urine filling filled with Gie3hara j or an appropriately filled out housing ü-: ör-: ie :: dio in-

'; within the envelope bsw. des Ge :: iu3es "Jiter ^ vhrachtcn" .'in-

fertilize consist of rounded strips of sheet metal that cover the

the wrapping bsv ;. of the housing ar.geva? t sir.ä.

It appears to be particularly advantageous to undermine the contractions in the corrugations of the housing that run over the ir.r.v_iialc of the housing. ^, ^, - - ^ i. Di33i sickle, kc'-iIien iiÖMÜch. ils iennsit ic to '.'"? - serve to stiffen the housing.

-4- VPA 72/3710

It is also considered advantageous if the secondary system encased with casting resin is noticeably smaller than the housing is and when the turns run in the space between the metallic shell and the housing. The turns are then namely arranged without interference. By the first cast resin body and the windings in the metallic housing can then be fixed in an insulated manner will.

It is also possible and under certain circumstances "special" advantageous if the windings are located on the outside of the metallic casing "or on the outside of the metallic housing "are located. It can then be achieved that no lead-through terminal at all in the interior of the if necessary, the space of the housing filled with a gaseous or liquid insulating medium must be guided. aside from that In such a case, a connection point between, for example, a first and a second winding omitted.

The outside on the housing or on the metallic casing lying head of the windings can be isolated from one another and from the housing in different ways and be held on the housing. For example, no-n can be the ladder have an insulating coating and / or via insulating pieces with the metallic casing or with the metallic Housing vcr ~ u; v ^ cn be.

On the other hand, it is also possible to accommodate the conductors of the windings in tubes which, in the case of an insulation coating of the conductor, can be made of metal and, if the conductors are not insulated or in addition to such conductor insulation, can be accommodated in insulating tubes. The tubes only need to have such a strength that

-5-. VPA 72/3710

they can be easily bent. They are preferably dimensioned so that, together with the compact rod, they form the window of the secondary system largely fill and thus mutually support each other, giving the converter a high Impulse current resistance is imparted.

It is also possible, however, to provide support bodies made of insulating material in the window of the secondary system to provide support the winding conductors in the window of the secondary system are used and also to achieve a high surge current resistance serve when the ladder itself does not fully fill the core window.

An exemplary embodiment is shown in FIG. 1 to explain the innovation of the current transformer according to the innovation in head design shown; in the figure 2 essentially only the head part of another embodiment is shown, wherein in this embodiment in comparison to the embodiment of Figure 1, the turns outside of the head housing. In the figure 3 is a further embodiment of the current transformer according to the innovation a cast resin insulation, the turns of the windings are housed within the insulation. Figures 4 and 5 each show a section transverse to the longitudinal axis of the head part and leave further explanations the windings and the head housing.

In the figure 6 is a further embodiment of the innovation according to Current transformer with turns running outside of a cast resin insulation surrounding the secondary system shown; in FIG. 7 is a cross section through the head housing of a further embodiment of the innovation according to the invention Current transformer reproduced.

In the figure 1 is a current transformer according to the innovation

-6- VPA 72/3710

recognize, which consists essentially of a head housing 1, an insulator part 2 and a foot part 3. On the headboard 1 an expansion body 4 is attached, the temperature-related volume changes of the current transformer shown in the present to absorb liquid isolating agent.

The head housing 1 - the primary turns and the switching arrangement are shown rotated in the drawing lines a secondary system 5, da;, made up of several iron cores 6 and 7 with secondary windings 8 and 9 ″. The secondary system 5 is in the illustrated embodiment of a Surrounding oil-paper insulation 10, which expires in the insulator part 2 in a known manner. The secondary system 5 is in one metallic head housing 11 housed, which has the shape has a hollow ring. The housing 11 has an annular opening 12 on its one end face. The opening In the exemplary embodiment shown, 12 is closed in a liquid-tight manner with an insulating plate 13.

The insulating plate 13 has a central recess 14 through which a short, compact rod 15 acts as a primary conductor is passed through for the largest current range. The compact rod 15 is in the area of the opposite The end face of the housing 11 is held in a support body 16. On this side, the rod 15 is directly connected to the network tied together. At its other end, the compact rod 15 is connected to a contact 17, which has a switch tab 18 can be connected to the conductor 19, which represents the further network connection of the current transformer.

In addition to the compact rod 15 as the primary conductor is in the head housing 11 of the current transformer housed a winding 20, which consists of a single turn. These "■■ - ·· -" ■■ · - - +: with one end through a recess 21 in the insulating plate 13 guided from the outside into the housing 11 and with

-7- VPA 72Λ710

its other end is directly connected to the compact rod 15. Since it is not connected to the rod 15, the Primary winding 20 is brought up to a switching contact 22 on the outside, which can also be connected to the conductor 19 via the switch tab 18.

In addition to the winding 20, the current transformer in the illustrated embodiment also has a further primary winding 23, which consists of a turn running inside the housing 11 and a further turn which is formed by the head housing 11. This is because the first turn is galvanically connected to the housing 11 at point 24. A conductor 26 for galvanic connection is provided between the housing 11 and a point 25 on the turn of the first primary winding 20. The beginning of the further primary winding 23 is led through a recess 27 in the insulating plate 13 to the outside of a contact 28 , which is connected to the conductor 19 in the position of the switch tab 18 shown.

It can be seen from FIG. 1 that in the position of the switchover tab 18 shown, the simple nominal current flows can; so the lowest current range is switched on. The current transformer then has a series connection of the other Primary winding 23 with the primary winding 20 and the compact rod 15, so is of four turns on the Primary excited. If the switch tab 18 is connected to the contact 22, then the winding 20 is with the rod connected in series and thus switched to the next higher current range. It can then double the nominal current can be detected. If, on the other hand, the switchover tab 18 is connected to the contact 17, then only the compact rod 15 is present effective and thus the largest current range switched on; four times the nominal current can be determined.

-8- VPA 72/3710

In the case of the head housing according to FIG. 2, it is inside the housing 30 housed only the secondary system 31 with its corresponding insulation. Inside the window of the secondary system 31 or of the hollow-ring-like housing 30, the compact rod 33 runs in turn for the largest current range and a first turn 34 and a further turn 35 of a primary winding which has a total of two turns. One end of this primary winding is connected to a contact piece 36 of a switching device, while the other end of the primary winding is connected to the metal housing 30 by turns 34 and 35. That metallic housing 30 forms one turn of a further primary winding, which consists only of this one turn. The housing 30 is therefore on the one hand with a contact piece of the Ums ehalt device and also directly with / the compact Rod 33 connected.

The housing 30 in turn has an annular opening 39 which is liquid-tight by means of an insulating plate 40 is locked. In the insulating plate 40 are recesses for the implementation of the winding conductor and the compact Staff provided. The plate 40 therefore serves as a support element for the primary conductor and therefore contributes to increasing the dynamic strength. On the opposite side of the head housing 30, a support body 41 is provided, the is arranged within the window 32 and is used to hold the primary conductor.

In the exemplary embodiment shown in FIG. 3, the secondary system 50 is supported by a grounded core holder 51 and embedded in a cast resin body 52. The cast resin body ^ς ? : .. st of elr.em metallic casing 53 around ^ e "bp>T>. e _? , _: - at a" tiriiocite is open. This opening can be used to introduce the casting resin into the housing 53.

-9-

720483627.4.72

-9- VPA 72/3710

In the illustrated embodiment, only the compact rod 55 runs in the window 54; the remaining turns are embedded in the cast resin body 52. Thus, a primary winding consisting of one turn 56 is inside of the cast resin body 52 and guided at one end to an outer terminal 57 which has a contact represents a switching device, not shown. The other end of the turn 56 is to another outer one Terminal 58 brought in, which is connected to the compact rod 55. .

Another primary winding consists of one in the cast resin body 52 embedded 7 / indung 59, which is connected at one end to an external terminal 60, which acts as a contact the switching device is used. The other end of the turn 59 is connected to a metallic housing 62 at point 61. The housing 62, which has a connecting line 63 is connected to the end of the turn 56 connected to the outer terminal 57, therefore forms a further one Turn of the further primary winding. In this embodiment of the current transformer according to the invention, there is no insulating plate required and therefore no sealing of this plate.

The embodiment of Figure 4 can again only schematically recognize a secondary system 70, which in a Cast resin body 71 is embedded. In the window 72 again runs a compact rod 73. turns 74 and 75, the are comparable with the turns 56 and 59 according to FIG. 3, exist in the exemplary embodiment according to FIG from rounded sheet metal strips, which are adapted to the curvatures of the housing 76 and therefore in the immediate Near the housing ev / and can be performed.

From Figure 5 it can be seen that the housing 80 with

-10- VPA 72/3710

Corrugations 81 and 82 are provided, in which, in turn, rounded sheet metal strips of turns 83 and 84 are guided. the Corrugations 81 and 82 advantageously reinforce the mechanical strength of the head housing 80. The window 85 surrounding area of the housing 86 is also provided with recesses 87 and 88 for accommodating the winding conductors.

In the embodiment of Figure 6 is the secondary system 90 in turn embedded in a cast resin body 91. The cast resin body 91 is surrounded on the outside by a housing 92, da3 again an annular opening on one end face 93 has. In this exemplary embodiment, there is no turn of the primary windings within the cast resin body 91 guided; rather, the windings run outside the cast resin body 91 and outside the housing 92. So is a primary winding with its single turn 94 initially from a contact piece 95 through the window 96 and then passed around the outside of the housing 92 to a connection point 97 with the compact short rod 98. Likewise Within the window 96, the conductor of a turn 99 of a further primary winding runs, the conductor Coming from a contact 100 after one turn at the point is galvanically connected to the head housing 92. The head case 92 forms a further turn of this primary winding by being connected to the with the Contact 95 connected end of turn 94 is connected; this connection takes place in point 103.

The conductors of the primary winding are in the illustrated embodiment provided with an insulating cover and insulated from the housing 92 by insulating pieces 104 and 105 arranged. Insulating pieces 106 and 107 are provided to fix the conductors inside the window.

-11-

-11- VPA 72/3710

The insulating pieces 104 "to 107 can be dispensed with, when - as shown in FIG. 7 - the conductor 110 of one primary winding and the conductor 111 of the further primary winding run in tubes 112 and 113; the conductors and 111 are connected to the conductors of turns 94 and 99 of the Embodiment according to Figure 6 comparable. The tubes and 113 L. have a relatively high rigidity and can be chosen in their diameter so that they in the window 114 together with the compact rod 115 the window largely fill out; the primary conductors are supported thus in the window of each other at>, which has a high current surge resistance has the consequence.

With the innovation a switchable current transformer is created, which is characterized by a high surge current resistance. The current transformer is not only for switching 1: 2: 4, but can also be used for any other switchovers if its primary windings are constructed accordingly.

7 figures
Expectations

-12-

Claims (16)

-12- VPA 72/3710 Sohutzanaprüohe 1.Current transformer of high voltage and current intensity, switchable on the primary side, with several windings surrounding the iron core and with a conductor cross-section decreasing according to the current ranges, with asm an additional, stretched conductor for a further current range, the largest compared to the current ranges of the windings, because the window of the secondary system as a compact, short rod cross-linked, characterized in that the secondary system is surrounded by a metallic casing and / or by a metallic housing in the manner of a hollow ring and that the metallic casing or the housing forms a turn of the windings. 2. Current transformer according to claim 1, characterized in that the metallic casing and / or the housing has an annular opening surrounding the window of the secondary system on one end face. 3. Current transformer according to claim 1 or 2, characterized in that the housing with a gaseous or liquid Insulating agent is filled and that the opening in the housing is closed gas- or liquid-tight with an insulating plate is, the recesses for leading through and holding the compact rod and the winding conductor of the Has windings. 4. Current transformer according to claim 1 or 2, characterized in that within the metallic casing or the housing The isolating agent is made of cast resin. 5. Current transformer according to claim 4, characterized in that approx .; LLe metallic casing made of a conductive coating applied to the QLz "tz ?? .- body -13- VPA 72/3710 6. Current transformer according to one of the preceding speeches, characterized in that a winding aua a single Winding consists of the housing or the metallic Sheath is formed. 7. Current transformer according to any one of Claims 1 "to 5, characterized in that a winding consists of at least one turn running within the metallic envelope or within the housing and a further winding composed of at least one turn accommodated within the envelope or the housing and consists of a further turn formed by the housing. 8. Current transformer according to one of claims 1 or 2 and 4 to 7, characterized in that one with cast resin filled metallic envelope or a housing housed within the envelope or dec housing Windings consist of rounded sheet metal strips which are adapted to the curvatures of the casing or the housing are. 9. Current transformer according to one of the preceding claims, characterized in that the inside the housing running turns are housed in beads of the housing. 10. Current transformer according to one of the preceding claims, characterized in that the encased with casting resin Secondary system is noticeably smaller than the housing and that the turns run in the space between the metallic casing and the housing. 11. Current transformer according to one of claims 1 to 6, characterized in that the windings on the outside of the metallic Enclosure or outside on the metallic housing. -14- VPA 72/3710 12. Current transformer after. Claim. 11, characterized in that that the conductors of the windings are connected to the metallic casing or to the metallic housing via insulating pieces are. 13. Current transformer according to claim 11 or 12, characterized in that that the conductors of the windings run in pipes. 14. Current transformer according to claim 13, characterized in that that the pipes are metal or insulating pipes. 15. Current transformer according to one of the preceding claims, characterized in that in the window of the secondary system There are support bodies made of insulating material, which are used to support the winding conductors in the window of the secondary system to serve. 16. Current transformer according to claim 13 or 14, characterized in that that the tubes and the short compact rod largely fill the window of the secondary system.