Der einzige relevante Google-Treffer ist folgender:

Weiterhin ist aus DE-PS 11 31 760 ein Breitband-Isoliertransformator bekannt, der hinter dem Strahlerzeuger auf der Elektronenstrahlmaschine angeordnet ist. Die auf Hochspannungspotential liegenden Teile sind mit einem mit Isolieröl gefüllten Tank verbunden, auf dessen Oberseite der Isoliertransformator angeordnet ist. In den Tank mündet ein dreiadriges Hochspannungskabel. Die Beschleunigungsspannung sowie die Hilfsspannung für die Wehneltelektrode und die Kathodenheizung verlaufen meist durch die ölgefüllte Isolierkerze und sind über dichte Durchführungen an die Elektroden des Strahlerzeugers angeschlossen
http://www.google.com/patents/DE4204900A1?cl=de&hl=de

Furthermore, from DE-PS 11 31 760 a broadband isolation transformer is known which is arranged behind the beam generator on the electron beam machine. The parts is at high-voltage potential are connected to a container filled with insulating oil tank on the upper side of the isolation transformer is arranged. In the tank empties a three-wire high voltage cables. The acceleration voltage and the auxiliary voltage for the Wehnelt electrode and the cathode usually proceed by heating the oil-filled Isolierkerze and are connected via sealed passages to the electrodes of the beam generator..
http://www.google.com.na/patents/DE4204900C2?cl=de&hl=de

Bei derartigen Elektronenstrahlkanonen bezeichnet man den Hochspannungsisolator mit seinen Zuleitungen für den Strahl­ erzeuger und den darüber angeordneten Isoliertrans­ formator, der die Funktion eines Hilfsspannungswandlers hat, auch häufig als "Strahlkopf". Bei den Strahl­ köpfen bekannter Elektronenstrahlkanonen sind die auf negativem Hochspannumgspotential liegenden Teile mit einem mit Isolieröl gefüllten Tank verbunden, auf dessen Oberseite auch der Isoliertransformator angebracht ist. In den Tank mündet eine dreiadriges Hochspannungs­ kabel, und die Beschleunigungsspannung sowie die Hilfs­ spannungen für die Strahlformungselektrode (Wehnelt- Elektrode) und die Katodenheizung werden im Bereich des Strahlkopfes erzeugt und sind innerhalb des Strahlkopfes entsprechend verdrahtet. (DE-PS 10 87 295 und DE-PS 11 31 760)
http://www.google.com.tj/patents/DE3333686C2?cl=de&hl=de

In such electron guns are referred to the high-voltage insulator with its feed lines for the beam generator and the transformer Isoliertrans arranged above it, which has the function of an auxiliary voltage transformer, also often referred to as "jetting head". When the jet heads known electron beam guns the parts lying on negative Hochspannumgspotential are connected to a container filled with insulating oil tank, on the upper side and the isolation transformer is attached. In the tank, a three-core high-voltage cable ends, and the acceleration voltage and the auxiliary voltage for the beam forming electrode (Wehnelt electrode) and the cathode heater are generated in the region of the jet head and are wired according within the jet head. (DE-PS 10 87 295 and DE-PS 11 31 760).
http://www.google.com.tj/patents/DE3333686C2?cl=en

Anm.: aus Deutsch maschinenübersetzt

Unter der “Isolierkerze” stelle ich mir eine isolierte Durchführung vor, die einer Kerze mit eingebettetem Docht ähnelt.

insulating bushing Isolierbuchse {f}
http://www.dict.cc/?s=Isolierbuchse

Domain TRANSPORT
Domain note structures
de
Term Isolierdurchführung
Reliability 3 (Reliable)
Term Ref. Aérospatiale,Wb.der Luft-und-Raumfahrt,Paris,1984

en
Term insulating lead through
Reliability 3 (Reliable)
Term Ref. Aérospatiale,Aerospace Dict.,Paris,1984
http://iate.europa.eu/SearchByQuery.do?method=searchDetail&l...


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Note added at 1 day4 hrs (2016-09-29 14:37:12 GMT)
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Dank Alisons Beitrag zur Diskussion ist jetzt klar, dass es sich um Isolierdurchführungen handelt, auf English "insulating bushings", so wie ich das von Anfang an vermutet hatte.

Bushings
Larger transformers are provided with high-voltage insulated bushings made of polymers or porcelain. A large bushing can be a complex structure since it must provide careful control of the electric field gradient without letting the transformer leak oil.[84]

Area Insulators / Terms concerning bushings
IEV ref 471-02-07
en outdoor bushing
bushing both ends of which are intended to be in ambient air at atmospheric pressure and exposed to outdoor atmospheric conditions
de Freiluft-Durchführung, f
http://www.electropedia.org/iev/iev.nsf/display?openform&iev...

Area Insulators / Terms concerning bushings
IEV ref 471-02-08
En outdoor-immersed bushing
bushing one end of which is intended to be in ambient air at atmospheric pressure and exposed to outdoor atmospheric conditions and the other end to be immersed in an insulating medium other than ambient air (e.g. oil or gas)
de Freiluft-Kessel-Durchführung, f
http://www.electropedia.org/iev/iev.nsf/display?openform&iev...

8.6 BUSHING POWER FACTORING (AC Hi-Potential Insulation Testing)
All bushings should be power factored before they are inserted into the transformer. If a Power Factor set is not available when a new transformer is being assembled, a capacitance bridge should, at the very least, be used to measure the bushing tap capacitance values
https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd...

In FIG. 2 there is a side view of an embodiment of a multi-voltage autotransformer, the autotransformer may include a number of high voltage and low voltage bushings 26 so there is a bushing for each series and common winding. One or more tertiary winding bushings 21 may also be provided. The bushings 26 and/or 21 will electrically connect the internal windings to the external network.
http://www.google.com/patents/US7692523

Und hier sind die “Isolierkerzen” zu sehen. Es handelt sich tatsächlich um Isolierdurchführungen.

Bushing Connections
In order to meet customer's needs, TATUNG provides several methods of
bushing connections, such as oil-to-air, oil-to-oil, oil-to-SF6 and air duct, to satisfy
customer's requirements.
 
Oil to Air
The transmission line is connected to transformer terminal with direct-coupled oil-to-air bushing. This type is the most economical and simple one. The transformer with this type is usually installed outdoors.
https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd...

GENERAL
The portable, high accuracy test sets allows performing Tan(δ), dissipation factor and capacitance tests on CT, VT, PT and CB. The TDX 5000 is developed to furnish a more compact solution to who is interested only on Tan(δ) test; it is the union of the measuring device and power generation in one instrument. It performs the measurement of the Tan(δ), of the dissipation factor and of the capacitance of a transformer or of a bushing, at the frequency of the mains or in a wide frequency range. The instrument is equipped with a patented measurement circuitry.
https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd...

In this context, this paper describes the first worldwide application project of BIOTEMP® as the insulating and cooling fluid in a 138kV high voltage 25MVA power transformer main tank, its high voltage bushings and its on load tap-changer.
:
Before assembly in this transformer, ABB high voltage GOB bushings have been also filled with BIOTEMP® vegetable oil. Later on the bushing were submitted to all routine tests and to a set of special tests with large number of impulses (lightning and switching) as well as applied AC voltage with Partial Discharge measurement. All bushings have been successfully approved with superior performance proving the excellence of BIOTEMP® also for transformer apparatus as HV bushings
https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd...

DIN High Voltage Transformer Bushing Assemblies
http://cmec-henan.manufacturer.globalsources.com/si/60088244...

ABB Condenser Oil to Air bushings for transformers Type GOM bushings
Type GOM (oil-air transformer bushing)
Bushing application: Transformer
Type: Oil to Air
Construction: Oil impregnated paper (OIP)
Standard: IEC
Service voltage (Ur): to 245 kV
Current (Ir): 1,600 A
http://www.transformer8.com/products/ABB-Condenser-Oil-to-Ai...