DE571774C

DE571774C - High-voltage-safe storage of winding heads of electrical machines on insulated retaining bolts

Info

Publication number: DE571774C
Application number: DES77001D
Authority: DE
Original assignee: Siemens Schuckertwerke AG; Siemens Corp
Current assignee: Siemens Schuckertwerke AG; Siemens Corp
Priority date: 1926-11-14
Filing date: 1926-11-14
Publication date: 1933-03-04

Description

Die Hochspannungsprüfung . elektrischer Maschinen für hohe Klemmenspannung führt oberhalb einer gewissen Spannungsgrenze zu Schwierigkeiten, weil an den Stellen, wo die isolierte Wicklung am Körper der Maschine gelagert ist, leicht Glimmerscheinungen auftreten, die die Luft an diesen Stellen leitend machen und die Gefahr eines Durchschlagens näher bringen. Dies läßt sich vermeiden, wenn es gelingt, die schädliche "Luftstrecke durch eine elektrisch leitende Überbrückung vom Isolierweg auszuschalten. Gemäß der Erfindung werden zu diesem Zwecke an den von isolierten Haltebölzen gehaltenen Wicklungsköpfen sowohl die Wicklungsköpfe selbst als auch die Haltebolzen an denjenigen. Stellen, wo sie einander berühren,-mit. einer innerhalb' ihrer "Isolierschicht angebrachten metallischen Belegung versehen, wobei dieThe high voltage test. electrical machines for high terminal voltage leads Above a certain voltage limit to difficulties, because in the places where the insulated winding is stored on the body of the machine, glimmering phenomena easily occur, which make the air at these points conductive and the risk of puncturing bring closer. This can be avoided if the harmful "air gap" is successful to be switched off by an electrically conductive bridge from the isolation path. According to the For this purpose, the invention is attached to the winding heads held by insulated retaining bolts both the winding heads themselves and the retaining bolts on those. Place, where they touch each other, -with. one attached within 'their' insulating layer metallic occupancy provided, with the

ao metallischen Belegungen dieser Teile miteinander elektrisch leitend verbunden werden. In Anlehnung an Vorschläge, die in anderen Zusammenhängen zur Vermeidung von Glimmerscheinungen gemacht worden sind, könnte man daran denken, zur Lösung der gestellten Aufgabe die Isolation der Wickelkopfleiter mit metallischen Belegungen zu versehen und diese unmittelbar mit den metallischen Haltebolzen leitend zu verbinden.ao metallic coverings of these parts are connected to one another in an electrically conductive manner. Based on suggestions that have been made in other contexts to avoid glowing phenomena, one could think of isolating the end-winding conductor to solve the task at hand to be provided with metallic coverings and these directly with the metallic To connect the retaining bolt conductively.

Hierzu müßte aber die Isolation auf dem Wickelkopf leiter erheblich verstärkt sein; dies ist jedoch mit großen Schwierigkeiten verknüpft, da Leiter, die mit starken Isolier-. stoff schichten bedeckt sind, sehr schwer gebogen werden können. Auch würde sich hierdurch ein wesentlich vergrößerter Raumbedarf der Wickelköpfe ergeben. Außerdem nimmt mit der Dicke der Isolation auch die Schwierigkeit eines gleichmäßigen Aufbaues unter Vermeidung jeglicher Lufteinschlüsse und anderer unstetiger Stellen zu.To do this, however, the insulation on the winding head would have to be considerably reinforced; However, this is associated with great difficulties, since conductors with strong insulating. If layers of fabric are covered, it is very difficult to bend. Also would be this results in a significantly larger space requirement for the winding heads. aside from that With the thickness of the insulation, the difficulty of a uniform structure also decreases while avoiding any air inclusions and other discontinuous points.

Diese Nachteile sind jedoch bei dem vorgenannten Vorschlag vermieden, da auf diese Weise ohne jegliche Verstärkung der Isolation eine vollständige Beherrschung der $5 Feldverteilung an den den Haltebolzen benachbarten Teilen der Wicklung ermöglicht wird.However, these disadvantages are avoided in the aforementioned proposal, since this Wise a complete mastery of the $ 5 without any reinforcement of the isolation Allows field distribution on the parts of the winding adjacent to the retaining bolt will.

In der Zeichnung ist der Erfindungsgegenstand an. zwei Ausführungsbeispielen . veranschäulicht, und zwar zeigen Abb. 1 und 2 je einen Längs- und Querschnitt durch das erste und Abb. 3 einen Querschnitt durch das zweite Ausführungsbeispiel.In the drawing, the subject of the invention is on. two embodiments. exemplified, namely, Fig. 1 and 2 each show a longitudinal and cross-section through the first and Fig. 3 a cross section through the second embodiment.

In Abb. ι und 2 bezeichnet 1 einen der am Gehäuse einer großen Wechselstrommaschine angebrachten Haltebolzen, der einen aus Kupferseele 2 und Isolierhülle 2' bestehenden Statorwicklungskopf trägt. Der Wicklungskopf ist in Gestalt eines Knies um den mit einer Isolierhülle 3 versehenen Haltebolzen 1 herumgeführt. Die Isolierhülle 3 besteht aus zwei Schichten, zwischen denen sich eine zylindrische, aus Zinnfolie hergestellte metallische Einlage 4 befindet. In entsprechender .Weise ist der Wicklungskopf mit einer in dieIn Fig. Ι and 2, 1 denotes one of the am Housing of a large alternating current machine attached retaining bolt, the one from Copper core 2 and insulating sleeve 2 'carries existing stator winding head. The winding head is in the form of a knee around the retaining bolt 1 provided with an insulating sleeve 3 shown around. The insulating sleeve 3 consists of two layers, between which there is a cylindrical, Metallic insert 4 made of tin foil is located. In a corresponding .Weise the winding head with a

Claims

two-layer insulating sleeve 2 'embedded metallic insert 5 equipped. The length the insert 5 is approximately three times the diameter of the insulated retaining bolt 1. The metallic inserts 4 and 5 are conductively connected to one another by means of a wire 6. To this end, the outer Layer of the bolt insulation 3 has a short interruption 7 through which the Verjo Binding wire is passed through.

A protective device designed in the manner described allows for use of retaining bolts of normal dimensions, the application of a test voltage that is twice as high as before, any glimmering phenomenon is avoided.

Instead of one, several assignments can be made on the retaining bolt or the winding

ao lungskopf are applied, on the one hand to the edge fields of the metallic if necessary To weaken coverings and on the other hand, in the case of multi-layer windings, the coverings of each winding with corresponding, to be able to electrically connect separate linings of the retaining bolt. This not only makes one for enables the operation required good potential distribution, but also particularly an examination of the layers against each other. An example of such a design is shown in Fig. 3. Here are two winding heads 8 arranged in different layers and 9 each with a metallic insert 8 'or 9' embedded in the insulating sleeve and arranged on a common retaining bolt 10, the two in its insulating sleeve metallic inserts 11 and 12 of miscellaneous Has a diameter which, in the manner shown in Fig. 3, with the inserts 8 'surrounding the copper cores 8 and 9 and 9 'of the two winding heads are conductively connected.

It is not absolutely necessary to use the ones provided to prevent the glow discharge Execute metal layers from tin foil. The metallic assignments can be in on As is known, it also consists of a conductive layer attached to the outside of an insulating layer Paint (e.g. aluminum powder) or one of the known metal spraying processes be made. Furthermore, it is not essential for the invention that the two metal coverings to be connected to one another are connected to each other by wires. Instead, you can just as easily establish a conductive connection by that one metallic covering with a wire brush resting against the other is connected or that there is even a direct metallic contact between the two Occupancy takes place.

PATENTANSI ¹ RUeHJi:

i. High-voltage-safe storage of winding heads of electrical machines on insulated retaining bolts, characterized in that both the winding heads as well as the retaining bolts at those points where both touch each other, with one attached within their insulating layer provided metallic assignment and that the metallic assignments of the two touching parts are electrically connected to each other.

2. Device according to claim 1, characterized in that at least one of the two touching parts is provided with several mutually insulated metallic inserts, from which the outermost part is conductively connected to the occupancy of the other touching part is.

3. Device according to claim 1 or 2 for multilayer windings, characterized characterized in that at least one corresponding to the number of layers on the retaining bolt Number of isolated metallic assignments are arranged, each with an assignment of the individual winding are conductively connected.

For this purpose I sheet drawings