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Buchholz relay

A technology of relays and power transformers, applied in circuits, electric switches, electrical components, etc., can solve problems such as danger, easy failure of reed contacts, and difficulty in replacement

Active Publication Date: 2014-03-05
MASCHFAB REINHAUSEN GEBR SCHEUBECK GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the commonly used reed contacts are prone to failure and difficult to replace
On the other hand, the function monitoring of the known Buchholz relays is only possible directly on the Buchholz relay itself, that is to say on the transformer in which the Buchholz relay is installed.
This is cost-intensive and also dangerous, since the Buchholz relays are usually not located in the non-hazardous range due to the proximity to structural parts carrying the high voltage and the transformer has to be switched off for detection

Method used

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Examples

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Embodiment Construction

[0016] To clarify the figures, it should be pointed out that for reasons of clarity, not all components have been provided with reference symbols in all figures.

[0017] figure 1 A Buchholz relay according to the invention is shown with a housing 1 to which an upper part 2 is fastened by means of a screw connection 3 . A first screw connection 4 with a connection end 4.1 is provided on the upper part 2, and a screw connection 5 with a connection end 5.1 is also provided. These connections will also be discussed in detail later. Furthermore, a cable screw connection 6 is provided, via which electrical lines (not shown here) are guided from the inner electrical switching element to the outside. The housing 1 and the upper part 2 enclose a collecting chamber which is at least partially—in normal operation completely—filled with an insulating liquid.

[0018] figure 2 In section A-A, a cover 7 is firstly shown, the underlying components of which will be explained later. The...

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Abstract

The invention relates to a Buchholz relay for monitoring the development of gas and the insulation liquid in liquid-filled high-voltage systems. Two floats which can be deflected and act on an electrical switching device are provided. Furthermore, a flow flap is provided which likewise acts on an electrical switching device. According to the invention, the electrical switching device comprises one or two immersion tubes in each of which separate magnetic switching tubes are provided. The immersion tubes extend in a perpendicular manner through the collection space of the Buchholz relay. Furthermore, a line is provided, the free end of said line ending in the Buchholz relay in the region of the flow flap, wherein the line can be subjected to the action of air or oil from the outside.

Description

Background technique [0001] Buchholz relays (double-float relays) are long known protective devices for oil-insulated power transformers. Buchholz relays exhibit faults such as short circuits, shorted coils or lack of transformer oil. In the event of small deviations, such as the development of gas, this state is usually only signaled—a so-called “Buchholz alarm” is realized. In the event of a catastrophic fault, such as a short circuit, the transformer is switched off. [0002] The known Buchholz relays are based on the fact that in oil-cooled transformers insulation faults or also severe overloading can lead to local overheating which leads to gas formation in the oil space of the transformer. Air bubbles accumulate in the upper part of the housing of the Buchholz relay and push against the oil present there in the normal state. In the event of a small fault, the float of the Buchholz relay drops due to gas formation and the contact closes, which notifies the fault. With...

Claims

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Application Information

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IPC IPC(8): H01H33/55H01H36/02H01F27/40H01H35/40
CPCH01F2027/404H01H36/02H01H35/40H01H33/555H01F27/402
Inventor K·黑默尔U·雷纳尔特K·菲尔埃克
Owner MASCHFAB REINHAUSEN GEBR SCHEUBECK GMBH & CO KG
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