GAS-ACTUATED RELAYS BUCHHOLZ TYPE . The new Comem Buchholz relay is an assembly of two machined aluminium alloy castings that effect a perfect. GAS-ACTUATED RELAYS COMEM TYPE. The range: 2. BG 25 H. Weight kg. Minimum clearance to remove the mecanism from the body. Min. The Buchholz relay also takes over the function of an oil level indicator when there The MSafe® Buchholz relay impresses with its robust construction in which.

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However, their specific design requires a different approach when talking about safety devices: An error occurred and your inquiry could not be sent. The frame 25 has a structure which is mostly longitudinally elongated and on which two posts 27 are provided in which seats 28 are formed for accommodating magnetic switches These gases can be used for a specific analysis to provide information on the status of the transformer or on-load tap-changer.

Alternatively, it is mounted on top of oil conservators and once there is a sudden air flow from air bag it trips the transformer. The distribution bchholz these gases can be related to the type of electrical fault, and the rate of gas generation can indicate the severity of the fault.

Imprint Privacy policy Reelay Suppliers Newsroom. Accessories for the Buchholz Relay: Are you looking for support or purchase information? Guides 46 are formed on the posts 27 of frame 25 in a region located below the lower movable device 32 of the floater type. The flow vent 9 has two permanent magnets.

The relay 16 is constituted by a hermetic body 17 which is preferably made of cast aluminum alloy and in which inspection ports 18 are formed preferably made of tempered glass and provided with graduated scales The relay 16 according to claim 1, characterised in that said movable flap device 33 comprises a tubular support 40 inside which a counterweight 41 can be inserted.

The movable device of the flap type 33 is preferably made of plastics. It is possible to detect hydrogen high-energy incident and carbon monoxide aging of the insulation material quickly and reliably based on the colour change of the indicators that are integrated in the glass tubes.

The terminals of the reed switches are positioned in the terminal box and the perfect sealing is guaranteed by an OR gasket. When gas is generated in the transformer it rises towards the conservator and collects in the upper chamber of the relay.


With reference to the above figures, an oil-filled transformer is generally designated by the reference numeral 10 and has a tank with radiating elements 11 to which an expansion vessel 12 of a per se known type is connected in an upward region. The relay is usually constituted by a body obtained from aluminum alloy castings, inside which a supporting frame is placed for at least one movable device which comprises an upper floater and a lower floater for operating magnetic switches.

Any further lowering of the level of the oil is detected by the floater 32 of the lower device 31, whereby immediate closure of the disconnection circuit is achieved. Lightning impulse withstand voltage kV peak Between circuits and earth 2 4 Across open contacts 1 3 Tests Type test: For the sake of standardisation the device is fitted with the left and right hand valve supports but only one valve.

An upper movable device 30 and an equivalent lower movable device 31 are fixed to the frame 25; each device is of a per se known type and comprises a floater 32 of the lever type. In particular, it is important to note that sides 39 uniformly distribute the effect of the presence of the counterweight 41 along the entire extension of the flat member Please select country from the list below.

Before being delivered, every single Buchholz relay is checked for leak proofness in addition to a function test. BR Internal gas accumulation and oil flow are monitored and kept under control by the Buchholz relay. Click for automatic bibliography generation. The sides 39 are parallel and are kept together by a tubular support 40 which protrudes monolithically from them with an axis which is parallel to the pivot Via Piemonte 26, Roma, IT.

The gas can in fact, in a first case, originate from outside and be introduced through the circulation pumps or, as an alternative, it can be the result of the decomposition of the liquid or solid insulators caused by overheating or by the onset of electric arcs.

I need more information ABB Sales. Installation guidelines The following table gives guidelines values: This aim, these objects and others which will become apparent hereinafter are achieved by a Buchholz relay which comprises, to be gelay in an oil bath, a supporting frame for magnetic switches for closing circuits which are operated by movable devices, of which at least one is of the floater type and at least one is of the flap type rotatably associated with said frame, characterized in that said flap device, which has a surface sensitive to the presence of oil currents, is independent of said buchhokz.


The presence of gas inside an oil filled transformer is always a sign of malfunction and one of the tasks of the Buchholz relay is to signal this presence.

A fundamental advantage achieved with the present invention is that a Buchholz relay has been provided which, without having to differentiate the production process, allows end users to choose the degree of sensitivity of intervention of the relay in the presence of oil currents.

Improved Buchholz relay – COMEM S.p.A.

The relay 16 according to claim 1, characterised in that said movable flap device 33 is made of plastics. The assembly of the movable device to the frame 25 accordingly occurs by snap action after the ends 36 of the pivot 35 have moved along the guides 46, by insertion and consequent locking in the seats For this country please use ABB’s partner contact details. ABB’s website uses cookies. Another important object of gelay present invention is to provide a Buchholz relay whose assembly is simple with respect to conventional relays.

Within the scope of this aim, an important object of the present invention is to provide a Buchholz relay which ensures good characteristics in terms of safety and most buchjolz all precision in the setting of the intervention threshold. Sticky label 90 X 52 with white background and black Trip circuit Trip circuit Codice: In the upper part, the relay 16 is provided with a cover 20 from which a gas drain cock 21, a pneumatic test valve 22 and a grommet 23 protrude.

For this test Messko uses helium at its state-of-the-art test stand. The Buchholz relay also takes over the function of an oil level indicator when there is not enough oil in the conservator or when there is an oil leak.


The flap is usually obtained monolithically with the lower floater, and when significant oil currents occur, the flap, by rotating about its own axis because it is directly affected by the flow, causes the intervention of the switch for closing the disconnection circuit. It is possible to draw reliable and meaningful conclusions regarding sources of error in the transformer or on-load tap-changer from the analysis results e.

For example, DE A discloses a Buchholz relay having all the features of the preamble of claim 1.