DE7020538U - SINGLE-LINE FEED-THROUGH CURRENT CONVERTER. - Google Patents

Description

Single conductor bushing current transformers ..

The innovation concerns a single-line bushing current transformer, especially for use in encapsulated generator leads.

In encapsulated generator leads are mostly dried ones Air or a gas with overpressure to prevent the ingress of humid and dusty outside air and to prevent pollution to avoid the busbar support. As a conclusion to the busbar cladding is mostly used sin a single-wire bushing current transformer in the form of a rail current transformer, which must be constructed in such a way that no pressure loss occurs. The encapsulated generator discharge must therefore through the Single-wire bushing current transformer sealed gas-tight will.

Single-line bushing current transformers used up to now have been met these requirements are insufficient, since their insulator was sealed in the area of the primary conductor, however not sufficiently gas-tight in the area of the housing v.ar.

The innovation is based on the task, one completely airtight or gas-tight single-conductor bushing current transformer, especially for use in encapsulated generator

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11 til

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derivations to create with an insulator receiving the primary conductor, which has a housing for receiving at least one Carrying core with secondary winding, the insulator both in the area of the primary conductor and in the area formed by the housing Slot is sealed gas-tight. This object is achieved according to the invention in that the housing with a one Foamed plastic with closed Cell structure is filled. By filling with foamed plastic, the current transformer according to the innovation also in the area of the housing completely gas-tight, since the pressure losses that have so far mainly led to, cannot be controlled leaks in the areas of the parting lines in the case of a split housing now have no effect on the Gas filling of the encapsulated generator discharge can have. Even when using undivided housings, the innovation-based Filling with foamed plastic Advantages, because it reduces the effect of the seal between the insulator and Housing is reinforced and thus a gas passage in the area of the housing is not possible.

The foamed plastic can be polyurethane, epoxy or silicone foam.

To explain the innovation, the figure shows an exemplary embodiment of the single-line bushing current transformer according to the invention partly shown in section.

The new bin-conductor bushing current transformer contains an insulator 1 with a through hole 2 for receiving a Primary conductor formed by a primary rail 3. The primary rail 3 is hard soldered into a cap at its end on the left in the figure. Furthermore, 4 clamping bolts 5 are hard soldered into the cap, which through holes in a further cap 6 of the

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Current transformers are guided and by screwing on nuts be excited. Since a sealing ring 9 is located between the cap 4 and the end 8 of the insulator 1 on the left in the figure, when Tensioning the clamping bolts 5 of the current transformer in accordance with the rules Area of the through hole 2 sealed gas-tight.

! The isolator 1 is in its place. Area sins confiscation 10 for receiving a housing 11 au £. An iron core 12 with a secondary winding 13 is located inside the housing 11 arranged. If necessary, several cores can be arranged in the housing or it can be a core with multiple windings. The housing 11 consists of two housing parts, creating a radially divided housing. The housing has a grounding pin 14 and secondary terminals on its circumference 15th

As the figure also shows, that formed by the housing 11 on the lateral surface of the recess 10 of the insulator 1 is The slot is closed by a seal 16 to allow a passage to avoid gas or air. This seal doesn’t but only there a gas-tight closure of the innovation according to the invention Current transformer, where it runs outside the area of the dividing joint of the housing 11. In the area of the dividing joints namely difficult sealing conditions that could not be solved satisfactorily so far, so that the previously used Single-line bushing current transformers did not meet strict gas impermeability requirements. The described Sealing difficulties will be renewed accordingly circumvented the fact that foamed plastic 17 is introduced inside the housing 11, which completely covers the housing 11 inside fills and due to its closed cell structure a completely gas-impermeable seal in the area of the Housing 11 causes.

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-4- VPA 70/3750 GM

The gas-tight seal through the new single-conductor bushing current transformer is completed in that it is attached to a sealing surface 18 with the interposition of a suitable Sealing ring is attached to a flange-like approach of the encapsulated generator discharge line. This is with Safety avoided that gas or air under excess pressure from the right in the figure of the innovation according to Bushing current transformer on the left side. Pressure losses due to the use of the new single-line through-flow converter in encapsulated generator discharge lines are therefore avoided.

1 figure

4 claims

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Claims (4)

-5- '* VPA 70/3750 GM protection claims 1. EIR leiier feedthrough current transformer, particularly for Verv ~ .r ν * "r, in encapsulated generator output lines, with a '' ii ^ he receiving insulator comprising a housing for receiving the prim - η carries at least one Eisrnkern with secondary winding The insulator is sealed in a gas-impermeable manner both in the area of the primary conductor and at the slot formed by the housing, characterized in that the housing is filled with a foamed plastic with a closed cell structure which creates a completely gas-impermeable seal in the area of the housing. 2. Single-line bushing current transformer according to claim 1, characterized in that the foamed plastic is pressed Is polyurethane foam. 3. Single-line bushing current transformer according to claim 1, characterized in that the foamed. plastic Epoxy foam is. 4. A] pus bushing current transformer according to claim 1, characterized in that the foamed plastic is silicone foam.