Electricity: power supply or regulation systems – Including a transformer or an inductor – Current transformer
Patent
1979-09-06
1982-03-16
Moose, Jr., Harry E.
Electricity: power supply or regulation systems
Including a transformer or an inductor
Current transformer
324 72, 324126, 336174, H01F 4008
Patent
active
043203370
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a combined current and voltage converter according to the pre-characterising clause of Patent Claim 1, hereinafter called combination converter for the sake of brevity.
With voltage converters for an enclosed high voltage installation filled with pressure gas, such as, e.g., SF.sub.6 it is known to obtain the measuring voltage by means of capacitive voltage division (Germal Offenlegungsschrift No. 2,139,225). Furthermore, it is also known (German Offenlegungsschrift No. 2,325,441) to create a combination converter by providing additional current converter cores with windings. However, the known combination converters possess the common feature that the electrode used for voltage measurements, as well as the current converter cores possibly provided, are arranged inside the housing, necessitating insulating passages in order to pass the secondary connections to the outside of the housing. In addition, if the current converter cores are dried insufficiently, the danger also exists that the SF.sub.6 gas becomes moist. Finally, a combination converter has also become known (German Utility Model No. 74,07,268) in which one metal layer forming one electrode for the capacitive voltage division is still situated inside the housing, requiring a passage through the housing, even though the current converter core is arranged to be located outside of the SF.sub.6 gas filling. In addition, the intermediate element carrying the metal layer is an insulating tube exposed to the internal pressure existing inside the housing.
It is the object of the invention to provide a combination converter which does not require any passage to the outside through the housing. In addition, it should be possible to accommodate several current converter cores in a simple manner.
The aforementioned object is achieved according to the invention by the measures specified in the characterising clauses of patent claims 1 to 8.
In this arrangement it is of advantage that by using a metallic intermediate element inserted in an insulated manner between the housing, the resistance of the latter to the internal pressure is high, even with a relatively great number of current converter cores, thus avoiding any weak points in the high voltage installation.
An advantageous embodiment is achieved with respect to the connection to the parts of the housing adjoining the combination converter by the measures according to the characterising clauses of patent claims 2 to 4. The measure according to the characterising clause of patent claim 5 results in an additional possibility for conducting the housing currents without distorting effect on the measuring current, apart from providing a simple protective cover for the current converter cores.
The drawing represents an illustrative embodiment of the invention, in which:
FIG. 1 shows a section of the combination converter and
FIG. 2 shows the detail A in FIG. 1 on an enlarged scale, whilst
FIG. 3 shows a variant with reference to the measuring cable leading to the voltage measuring amplifier.
In FIG. 1 there is located between the housing 1, 2 the intermediate element 3, inserted in an insulated manner, which has virtually the same inside diameter and wall thickness as the housing. Parts 1 to 3 suitably consist of a light metal, such as aluminium or one of its alloys. 4 designates the conductor carrying a high voltage, mounted to be insulated inside housing 1, 2 in a known manner. The interior of the housing is filled with pressure gas, such as, e.g., SF.sub.6. FIG. 2, showing the detail A of FIG. 1 on an enlarged scale, shows the connection of intermediate element 3 to housing 1 in greater detail. Between housing 1 and intermediate element 3, insulating parts 7, 8 are arranged, insulating part 8 insulating the pressure ring 5 with respect to intermediate part 3. Pressure ring 5 and housing 1 are flanged together by means of screw connections indicated symbolically. If pressure ring 5 consists of a reinforced insulating plastic, instead of metal, insulating part 8 can possibly
REFERENCES:
patent: 3538440 (1970-11-01), Galloway
patent: 3869665 (1975-03-01), Kenmochi et al.
patent: 3900791 (1975-08-01), Kleen et al.
patent: 3942099 (1976-03-01), Freygang et al.
patent: 3959761 (1976-05-01), Graul
patent: 4277746 (1981-07-01), Abe et al.
Hartmann Hans
Mauthe Gerhard
BBC Brown Boveri & Company Ltd.
Moose Jr. Harry E.
LandOfFree
Combined current and voltage converter for a compressed-gas insu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Combined current and voltage converter for a compressed-gas insu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combined current and voltage converter for a compressed-gas insu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1643760