Buchholz relay: Difference between revisions
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[[Image:Buchholz 2.JPG|thumb]] |
[[Image:Buchholz 2.JPG|thumb]] |
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In the field of electric power distribution and transmission, a '''Buchholz relay''', also called a '''gas |
In the field of electric power distribution and transmission, a '''Buchholz relay''', also called a '''gas specifications from Electromotoren und Gerätebau Barleben GmbH] Contains a detailed description (in English) of the Buchholz detection principles and mechanisms |
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The [[relay]] has two different detection modes. On a slow accumulation of gas, due perhaps to slight overload, gas produced by decomposition of [[transformer oil|insulating oil]] accumulates in the top of the relay and forces the oil level down. A [[float switch]] in the relay is used to initiate an alarm signal that also serves to detect slow oil leaks. |
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If an [[electric arc|arc]] forms, gas accumulation is rapid, and oil flows rapidly into the conservator. This flow of oil operates a switch attached to a vane located in the path of the moving oil. This switch normally will operate a [[circuit breaker]] to isolate the apparatus before the fault causes additional damage. Buchholz relays have a test port to allow the accumulated gas to be withdrawn for testing. Flammable gas found in the relay indicates some internal fault such as overheating or [[arcing]], whereas air found in the relay may only indicate low oil level or a leak. |
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Buchholz relays have been applied to large power transformers at least since the 1940's. The relay was first developed by Max Buchholz (1875-1956) in 1921 <ref> http://www.transformerworld.co.uk/buchholz.htm Tutorial T5 </ref>. |
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Names like ''beechwood relay'' or ''beech relay'' are an indication of incorrectly translated German language manuals. <!-- happened on an energetics conference, and the interpreter had no clue why is everybody laughing so hard --> |
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==References== |
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<references/> |
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==External links== |
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*[http://www.emb-online.de/pdf/01-02-08-02%20Prospekt%20Buchholzrelais%20ENGLISCH.pdf Buchholz relay technical specifications from Electromotoren und Gerätebau Barleben GmbH] Contains a detailed description (in English) of the Buchholz detection principles and mechanisms |
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* Koncar A.k.a Rade Koncar , Buchholz relays , for power and distribution transformers. [http://www.koncar-nsp.hr/eng/prikaz.asp?txt_id=1732] |
* Koncar A.k.a Rade Koncar , Buchholz relays , for power and distribution transformers. [http://www.koncar-nsp.hr/eng/prikaz.asp?txt_id=1732] |
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* [http://www.pbpowereng.co.uk/pdf/PBSIWeir_Mk10%20Buchholz.pdf Buchholz Relay] |
* [http://www.pbpowereng.co.uk/pdf/PBSIWeir_Mk10%20Buchholz.pdf Buchholz Relay] |
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Revision as of 13:47, 27 November 2009
In the field of electric power distribution and transmission, a Buchholz relay, also called a gas specifications from Electromotoren und Gerätebau Barleben GmbH] Contains a detailed description (in English) of the Buchholz detection principles and mechanisms
- Koncar A.k.a Rade Koncar , Buchholz relays , for power and distribution transformers. [1]
- Buchholz Relay
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