DE2113231B2

DE2113231B2 - HV capacitor with current surge discharge - has capacitor elements in parallel and series connection and terminals on opposite metal housing surfaces

Info

Publication number: DE2113231B2
Application number: DE19712113231
Authority: DE
Inventors: Dieter Prof. Dr.-Ing. 3300 Braunschweig; Naglik Manfred Dipl.-Ing. 3301 Mascherode; Kaltofen Albert 8602 Amlingstadt; Zwecker Karl Dipl.-Ing. 8600 Bamberg Kind
Original assignee: Messwandler-Bau Gmbh, 8600 Bamberg
Priority date: 1971-03-18
Filing date: 1971-03-18
Publication date: 1976-01-29
Also published as: DE2113231A1

Abstract

The HV capacitor with high energy for surge discharges consists of a number of capacitor elements in parallel and series connection, which are connected to two external terminals, at least one consisting of a metal element insulated by a ring from the terminal flange on its free end. The second capacitor terminal is brought out through the metal housing surface opposite the first terminal. It also consists of a metal terminal element with an insulating ring on its free end between the terminal flange. Both terminals consist of sheet metal with contact surfaces, projecting in external direction and parallel to the terminal flange surface.

Description

kautschuk als sogenannte Radialdichtungen ist aus dem Aufsatz von B e η k e η > >Über die elektrische Festigkeit von Fugen zwischen festen Isolierstoffen« in der ETZ-A, Bd. 89 -1968- Heft 15, S. 356 bis 361, bekannt. rubber as so-called radial seals is from the essay by B e η k e η> > About the electrical strength of joints between solid insulating materials «in the ETZ-A, Vol. 89 -1968- Issue 15, pp. 356 to 361, known.

Ferner ist es vorteilhaft, wenn die Kondensatorelemente aus Flachwickeln bestehen, die in zwei nebeneinanderliegenden Stapeln im Metallgehäuse angeordnet und mittels eines zentralen Spannbolzens stirnseitig verspannt sind. Die Flachwickel können durch den zentralen Spannbolzen genügend stark vorgepreßt werden, so daß die bei den Entladungen auftretenden großen Kräfte ohne weiteres von der Verspanneinrichtung aufgefangen werden. Besonders günstig ist es, wenn die Isolierringe in ihren Mitten Ausnehmungen für den Spannbolzen aufweisen, so daß dieser nach dem Einsetzen der Kondensatorelemente in das Metallgehäuse nachspannbar ist. Dadurch kann die Einhaltung eines vorbestimmten Preßdrucks auch nach längerer Betriebsdauer sichergestellt werden. Insbesondere kann der Wickelstapel nach dem Imprägniervorgang der Kondensatorelemente nachgepreßt werden. Mit Vorteil können die Kondensatorelemente durch einen aus zwei Teilen bestehenden Isolierkasten gegen das Metallgehäuse isoliert sein. Der Isolierkasten ist zweckmäßig so bemessen, daß er dem Wickelstapel eine ausreichende mechanische Stabilität verleiht. Weiterhin ist es von Vorteil, wenn die beiden Teile des IsolierRastens an der Trennfuge in spitzem Winkel angeschäftet sind. Dadurch erhält man eine überlappende Verbindungsstelle mit einem langen Kriechweg, was insbesondere für Impulskondensatoren hoher und höchster Spannungen vorteilhaft ist. Schließlich ist es von Vorteil, wenn das Metallgehäuse aus dünnem, die Volumenänderungen des Isoliermediums aufnehmendem Blech besteht. Durch die Membranwirkung des Metallgehäuses kann auf ein besonderes Ausdehnungsgefäß für das Isoliermedium verzichtet werden.It is also advantageous if the capacitor elements consist of flat coils, which are arranged in two adjacent stacks in the metal housing and are clamped at the front by means of a central clamping bolt. The flat winding can through the central Clamping bolts are pre-pressed sufficiently strong so that the large ones that occur during the discharges Forces are easily absorbed by the bracing device. It is particularly favorable if the Isolating rings have recesses in their centers for the clamping bolt, so that this after insertion the capacitor elements can be tightened in the metal housing. This allows compliance with a predetermined pressing pressure can be ensured even after a long period of operation. In particular the winding stack can be re-pressed after the impregnation process of the capacitor elements. With Advantageously, the capacitor elements can be protected by an insulating box consisting of two parts Metal housing to be insulated. The insulating box is expediently dimensioned in such a way that it gives the winding stack a sufficient gives mechanical stability. It is also advantageous if the two parts of the IsolierRastens are attached to the parting line at an acute angle. This gives an overlapping joint with a long creepage distance, which is particularly important for pulse capacitors of high and extremely high voltages is advantageous. Finally, it is advantageous if the metal housing is made of thin, the volume changes of the insulating medium absorbing sheet. The membrane effect of the metal housing allows there is no need for a special expansion vessel for the insulating medium.

Einzelheiten und Vorteile der Erfindung werden an einem Ausführungsbeispiel an Hand der Zeichnungen näher erläutert.Details and advantages of the invention are illustrated in an exemplary embodiment with reference to the drawings explained in more detail.

F i g. 1 zeigt einen Längsschnitt durch einen elektrischen Hochspannungskondensator;F i g. 1 shows a longitudinal section through an electrical high-voltage capacitor;

F i g. 2 zeig! den Hochspannungskondensator gemäß F i g. 1 in der Draufsicht.F i g. 2 show! the high-voltage capacitor according to FIG. 1 in plan view.

Der Hochspannungskondensator 1 weist an entgegengesetzten Flächen 2, 3 eines Metallgehäuses 4 Anschlußstücke 5,6 auf, die mittels Isolierringen 7,8 gegen das Metallgehäuse 4 für die volle Betriebsspannung isoliert sind. Die vorzugsweise aus Epoxydharz-Formstoffen bestehenden Isolierringe 7, 8 weisen Flanschstücke 9, 10, auf, mit dem sie an mit dem Metallgehäuse 4 verbundene Anschlußflansche 11, 12 angeschlossen, vorzugsweise mittels Schrauben 13, 14 befestigt sind. In axialer Richtung vorspringende ringförmige Flansche 15, 16 an den Isolierringen 7, 8 sind für den Anschluß elastischer, hochspannungsfester Dichtungselemente, vorzugsweise aus Silikonkautschuk, vorgesehen. Die Kondensatorelemente bestehen aus Flachwickeln 17 mit einem Dielektrikum aus Kondensatorpapier, die in zwei nebeneinanderliegenden Stapeln 18, 19 (F i g. 2) im Metallgehäuse 4 angeodnet sind. Die einzelnen Windungen der Flachwickel 17 sind stirnseitig mittels Brükken 20, 21 kontaktiert. Zr Erzielung eines niederinduktiven Aufbaus der Wickelstapel 18, 19 sind mehrere Flachwickel 17 parallel geschaltet und mehrere dieser parallel geschalteten Gruppen bifilar in Serienschaltung verbunden. An den Enden der Wickelstapel 18, 19 sind Preßplatten 22, 23 aus Stahl angeordnet, die beide Wickelstapel 18, 19 überdecken und die über Kontaktstücke 24, 25 mit den Anscnlußstücken 5, 6 in Verbindung stehen. An der linken Anschlußseite (Fig. l) ist zwischen der Preßplatte 22 und dem Kontaktstück 24 eine mit dem Kontaktstück 24 verlötete Metallplatte 26 vorgesehen, die an der Preßplatte 22 lose anliegt. Die Anschlußstücke 5, 6 sind somit über die Kontaktstücke 24, 25, die Metallplatte 26 bzw. die Preßplatie 21 sowie die Anschlußfahnen 27, 28 mit den beiden äußersten Kondensatorflachwickeln 17 leitend verbunden.The high-voltage capacitor 1 has connecting pieces on opposite surfaces 2, 3 of a metal housing 4 5.6, which is isolated by means of insulating rings 7.8 against the metal housing 4 for the full operating voltage are. The insulating rings 7, 8, which preferably consist of epoxy resin molded materials, have flange pieces 9, 10, with which it is connected to connecting flanges 11, 12 connected to the metal housing 4, preferably are fastened by means of screws 13, 14. Annular flanges protruding in the axial direction 15, 16 on the insulating rings 7, 8 are for the connection of elastic, high-voltage-resistant sealing elements, preferably made of silicone rubber, provided. The capacitor elements consist of flat windings 17 with a dielectric made of capacitor paper, which are arranged in two adjacent stacks 18, 19 (FIG. 2) are angeodnet in the metal housing 4. The individual turns of the flat winding 17 are on the front side by means of bridges 20, 21 contacted. In order to achieve a low-inductance structure of the winding stacks 18, 19, there are several Flat winding 17 connected in parallel and several of these groups connected in parallel are bifilar in series tied together. At the ends of the winding stacks 18, 19 press plates 22, 23 made of steel are arranged, both of which Cover the winding stacks 18, 19 and the contact pieces 24, 25 with the connecting pieces 5, 6 in connection stand. On the left connection side (Fig. 1) is between the press plate 22 and the contact piece 24 is a metal plate 26 soldered to the contact piece 24 provided, which rests loosely on the pressure plate 22. The connecting pieces 5, 6 are thus over the contact pieces 24, 25, the metal plate 26 and the press plate 21 as well the connecting lugs 27, 28 are conductively connected to the two outermost flat capacitor windings 17.

Um Bewegungen der Kondensatorbeläge auf Grund elektrostatischer oder elektrodynamischer Kräfte zu vermeiden, werden die Wickelstapel 18, 19 durch einen zentralen Spannbolzen 29 aus glasfaserverstärktem Kunststoff gepreßt. Der Preßdruck kann durch Muttern 30, 31, die im Bereich von Ausnehmungen 32, 33 in der Mitte der Isolierringe 7, 8 angeordnet sind, eingestellt und falls erforderlich nach dem Einsetzen der Wickelstapel 18,19 in das Metallgehäuse 4 nachgestellt werden. Auch eine betriebsbedingte Nachstellung des Preßdrucks ist jederzeit möglich. Hierzu müssen nur die mittels Schrauben 43, 44 an den Isolierringen 7, 8 befestigten Anschlußstücke 5, 6 entfernt werden, damit die Mutlern 30, 31 des Spannbolzens 29 zugänglich sind. Die Isolierung der Wickelstapel 18, 19 gegen das Metallgehäuse besteht aus einem sich aus zwei Teilen 34, 35 zusamensetzenden Isolierkasten 36 aus Preßspan. Die Wandstärke des Isolierkastens 36 ist so bemessen, daß dieser den Wickelstapeln 18, 19 einen ausreichend meachanischen Halt gewährleistet. Die beiden Teile 34, 35 des Isolierkastens 36 sind an ihrer Trennfuge 37 in spitzem Winkel angeschäftet. Das Metallgehäuse 4 besteht aus dünnem, die Volumenänderungen des Isoliermediums, vorzugsweise Mineralöl, aufnehmendem Blech. Nach der Montage v.irü das Metallgehäuse 4 stirnseitig mit an den metallenen Anschlußflanschen 11, 12 angeschweißten Gehäusedeckeln 38, 39 dicht verschweißt.To prevent movements of the capacitor plates due to electrostatic or electrodynamic forces avoid the winding stacks 18, 19 by a central clamping bolt 29 made of glass fiber reinforced Pressed plastic. The pressing pressure can be increased by nuts 30, 31 in the area of recesses 32, 33 in the center of the insulating rings 7, 8 are arranged, and if necessary after the insertion of the Winding stacks 18, 19 are readjusted in the metal housing 4. Also an operational readjustment of the Press pressure is possible at any time. For this purpose, only the screws 43, 44 on the insulating rings 7, 8 attached connecting pieces 5, 6 are removed so that the nuts 30, 31 of the clamping bolt 29 are accessible are. The insulation of the winding stacks 18, 19 against the metal housing consists of two parts 34, 35 composite insulating box 36 made of pressboard. The wall thickness of the insulating box 36 is dimensioned so that this ensures the lap stacks 18, 19 a sufficiently mechanical hold. The two Parts 34, 35 of the insulating box 36 are attached to their parting line 37 at an acute angle. The metal case 4 consists of thin, the changes in volume of the insulating medium, preferably mineral oil, absorbing Sheet. After assembling the metal case 4 on the end face with housing covers 38, 39 welded to the metal connection flanges 11, 12 tightly welded.

Wie die F i g. 2 zeigt, weisen die Isoläerringe 7, 8 zusätzliche Gewindebohrungen 40 auf, die zum Anschluß eines Gehäuses für einen Schalter, beispielsweise eine Mehrfachfunkenstrecke, eine Ladeeinrichtung oder ein Experiment, dienen. Der Schalter, die Ladeeinrichtung bzw. das Experiment selbst werden unmittelbar an die Anschlußringe 5, 6 angeschlossen. Hierfür sind die Gewindebohrungen 41, 42(F i g. 1) vorgesehen.As the F i g. 2 shows, the Isoläerringe 7, 8 have additional Threaded bores 40 for connecting a housing for a switch, for example a Multiple spark gaps, a charging device or an experiment. The switch, the charger or the experiment itself are connected directly to the connecting rings 5, 6. The threaded holes are for this 41, 42 (Fig. 1) are provided.

Der Hochspannungskondensator gemäß der Erfindung zeichnet sich dadurch aus, daß er mit sehr hohen Spannungen weit über 10OkV, beispielsweise 15OkV, bei einer äußerst niedrigen Eigeninduktivität betrieben werden kann. Wie Versuche gezeigt haben, beträgt die Gesamtinduktivität einer 150 kV-Finheit nur 4OnH. Dies ist unter anderen darauf zurückzuführen, daß die ebenen Anschlußstücke sehr nahe an das leitende Gehäuse herangebracht werden können. Vorteilhaft ist auch die sehr hohe Energiedichte des Hochspannungskondensators gemäß der Erfindung. Bei dem erwähnten 150 kV-Kondensator betrug das Verhältnis Energieinhalt/Gesamtvolumen etwa 0,1 Ws/cm^J. Trotz dieser hohen Energiedichte ist auch die Lebensdauer außergewöhnlich hoch. Der symmetrische koaxiale Aufbau ermöglicht es, an einem Anschlußstiick die Verbindungsleitung zum Experiment und an der dem anderen Anschlußstück, den Schalter und die Ladeeinrichtung anzuschließen. Das Gehäuse dient dabei als koaxialer Rückleiter im Entladekreis. Die Energiespeichereinheit wird günstigerweise in völlig gekapselter Bau-The high-voltage capacitor according to the invention is characterized in that it can be operated with very high voltages well over 100 kV, for example 150 kV, with an extremely low self-inductance. As tests have shown, the total inductance of a 150 kV fin unit is only 40nH. This is due, among other things, to the fact that the flat connecting pieces can be brought very close to the conductive housing. The very high energy density of the high-voltage capacitor according to the invention is also advantageous. In the case of the 150 kV capacitor mentioned, the energy content / total volume ratio was approximately 0.1 Ws / ^cmJ . Despite this high energy density, the service life is also exceptionally long. The symmetrical coaxial structure makes it possible to connect the connection line to the experiment to one connector and to the other connector, the switch and the charging device. The housing serves as a coaxial return conductor in the discharge circuit. The energy storage unit is expediently in a completely encapsulated construction

weise mit Silikonkautschuk als Hochspannungsdichtungen und SFb als Isoliergas für die an den Isolierringen bzw. Anschlußstücken angeflanschten zusätzlichen Einrichtungen, wie Schalter, Ladeeinrichtung und Experiment, ausgeführt.wise with silicone rubber as high-voltage seals and SFb as insulating gas for the additional devices flanged to the insulating rings or connection pieces, such as switches, charging devices and experiments.

Hierzu 2 Blatt ZeichnungenFor this purpose 2 sheets of drawings

Claims

L Patent claims:

1. An electrical high-voltage capacitor having a high energy content for surge current discharges the Kondensatoreiementen combined from a plurality of in series and parallel connection is connected to two outwardly leading electric connections, and wherein at least one of the two electrical Anschiüsse from ^e: NEM metallic fitting which is insulated by an insulating ring from a connection flange having a flat connection surface on the side facing away from the metal housing, characterized in that the second electrical connection of the high-voltage capacitor (1) leads out to a surface of the metal housing (4) opposite to the first electrical connection is and, like the first connection, consists of a metallic connection piece (6) which is isolated by an insulating ring (8) from a connection flange (12) having a flat connection surface on the side facing away from the metal housing (4), and that b Both connection pieces (5,6) each consist of a metal plate which have flat, outwardly directed contact surfaces which run parallel to the connection surface of the connection flanges (11, 12) and are at least approximately in one plane with these surfaces.

2. High-voltage capacitor according to claim 1, characterized in that the insulating rings (7, 8) on the sides facing away from the metal housing (4) protruding in the axial direction, circumferential Flanges (15, 16) for the connection of elastic, high-voltage resistant Have sealing elements.

3. High-voltage capacitor according to claim 1 or 2, characterized in that the capacitor elements consist of flat coils (17) in two adjacent stacks (18, 19) in the Metal housing (4) arranged and clamped at the end by means of a central clamping bolt (29)

4. High-voltage capacitor according to one of claims 1 to 3, characterized in that the Isolating rings (7, 8) have recesses (32, 33) for the clamping bolt (29) in their centers, so that this can be tightened after the capacitor elements (17) have been inserted into the metal housing (4) is.

5. High-voltage capacitor according to one or more of claims 1 to 4, characterized in that that the capacitor elements (17) through an insulating box consisting of two parts (34, 35) (36) are insulated from the metal housing (4).

6. High-voltage capacitor according to claim 5, characterized in that the two parts (34, 35) of the insulating box (36) are connected to the parting line (37) at an acute angle.

7. High-voltage capacitor according to one or more of claims 1 to 6, characterized in that that the metal housing (4) made of thin, the volume changes of the insulating medium absorbing Sheet is made.

65 The invention relates to a high-voltage capacitor according to the features in the preamble of claim 1.

Such a high-voltage capacitor is known from DT-AS 11 72 776. There is the second electric one Connection arranged on the same end face of the capacitor next to the first electrical connection. This results in a high-voltage pulse capacitor in what is known as a pot or cup design, which requires a greater overall height and thus an increased self-inductance of the pulse capacitor. The self-inductance is reduced by the isolated connection bolts, which are designed as feed-through bolts this known high-voltage capacitor is additionally increased.

From US-PS 34 83 453 is a high-voltage capacitor in a similar design (pot or cup design) known as described above. The individual capacitor elements consist of flat angles, which are housed in several adjacent stacks in the metal housing of the capacitor.

From DT-PS 5 27 697 an electrical capacitor is known whose metal end plates by several tension screws, isolated from one another and serving as power supply lines, of which each is contacted with an end plate. against the deposits protruding from the capacitor stack be pressed.

The invention is based on the object of providing a high-voltage capacitor of the type mentioned at the beginning Art to train so that it has an extremely low self-inductance and he can easily a fully encapsulated energy storage system can be installed.

This task is characterized by that in claim 1 Features solved.

In that both connecting pieces are arranged on opposite surfaces of the metal housing. the high-voltage capacitor according to the invention can be equipped with a charging device, a switch, an experiment or the like. To be combined into a unit that is extremely low inductance. In particular it is possible to install the capacitor directly in the course of an encapsulated system, whereby the metal housing, as is known per se, serves as a current return conductor. Another decisive advantage of the invention Capacitor can be seen in the fact that the isolated Connection pieces at least approximately in one plane with the connection flanges of the metal housing lie. This increases the self-inductance of the capacitor due to the connection inductivities practically avoided. The self-inductance of the entire capacitor is only slightly greater than the inductance of the capacitor elements forming the winding stack.

The insulating rings advantageously point in the axial direction on the sides facing away from the metal housing protruding, circumferential flanges for the connection of elastic, high-tension-resistant sealing elements on. By connecting a high-voltage-proof sealing element, preferably made of silicone rubber, to the axial flanges of the insulating plates, the radial distance between the terminals and the metal housing is reduced to a minimum and thus the self-inductance of the capacitor still be further reduced. The use of high-voltage-resistant sealing elements made of silicone