{"id":12886,"date":"2024-12-16T09:42:24","date_gmt":"2024-12-16T08:42:24","guid":{"rendered":"https:\/\/onload.reinhausen.com\/de\/?p=12886"},"modified":"2025-07-07T18:09:12","modified_gmt":"2025-07-07T16:09:12","slug":"burst-prevention-system-on-load-tap-changer","status":"publish","type":"post","link":"https:\/\/onload.reinhausen.com\/en\/12-2024\/burst-prevention-system-on-load-tap-changer\/","title":{"rendered":"Arc Enemy"},"content":{"rendered":"\n
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Faults in trans\u00adformer wind\u00adings, bush\u00adings, and on-load tap-chang\u00aders, in which large amounts of ener\u00adgy are released, are extreme\u00adly rare. If they do occur, how\u00adev\u00ader, high pres\u00adsure is cre\u00adat\u00aded by an elec\u00adtric arc that vapor\u00adizes the sur\u00adround\u00ading insu\u00adlat\u00ading liq\u00aduid. If the process is uncon\u00adtrolled, the con\u00adse\u00adquences can be seri\u00adous. In gen\u00ader\u00adal, trans\u00adformer tanks and pro\u00adtec\u00adtion sys\u00adtems, includ\u00ading those of on-load tap-chang\u00aders (OLTCs), are pre\u00adpared for this: In the event of a fault, they release pres\u00adsure as con\u00adtrolled as pos\u00adsi\u00adble to min\u00adi\u00admize the impact on the envi\u00adron\u00adment.<\/p>\n\n\n\n

How\u00adev\u00ader, there is poten\u00adtial for opti\u00admiza\u00adtion to reduce the risk even fur\u00adther, espe\u00adcial\u00adly for the rare events with release of very high ener\u00adgies. For this rea\u00adson, designs and pro\u00adtec\u00adtion sys\u00adtems have been and con\u00adtin\u00adue to be improved, for exam\u00adple with robust trans\u00adformer tanks. In the event of an arc fault in the trans\u00adformer tank, the ener\u00adgy released is dis\u00adsi\u00adpat\u00aded by defor\u00adma\u00adtion of the tank which has been proven to be the most effec\u00adtive mea\u00adsure against fire after a high-ener\u00adgy arc fault.<\/p>\n\n\n

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<\/div>

The renowned Chi\u00adnese Elec\u00adtric Pow\u00ader Research Insti\u00adtute (CEPRI) has sub\u00adject\u00aded the BPS pas\u00adsive-pro\u00adtec\u00adtion sys\u00adtem to tough real-life tests by pro\u00advok\u00ading high-ener\u00adgy arc\u00ading in test trans\u00adform\u00aders.<\/p><\/div>\n

<\/div>

Users and grid oper\u00ada\u00adtors can retro\u00adfit their trans\u00adform\u00aders with rein\u00adforced BPS cov\u00aders at any time.<\/p><\/div>\n<\/div>\n\n\n

MR has devel\u00adoped the BPS \u2013Burst Pre\u00adven\u00adtion Sys\u00adtem as a sup\u00adple\u00adment for robust trans\u00adformer tanks. The over\u00adall result is a trans\u00adformer that min\u00adi\u00admizes the effects of such dam\u00adag\u00ading events, which can be of great impor\u00adtance for oper\u00ada\u00adtors of ener\u00adgy infra\u00adstruc\u00adture as well as for indus\u00adtri\u00adal com\u00adpa\u00adnies, and any\u00adwhere where space is lim\u00adit\u00aded.<\/p>\n\n\n\n

Cover Reinforcement<\/h2>\n\n\n\n

The engi\u00adneers at MR have scru\u00adti\u00adnized and rein\u00adforced all rel\u00ade\u00advant parts of the OLTC, from the cov\u00ader to the gear unit, screw con\u00adnec\u00adtions, flow relay, sight glass, and pres\u00adsure relief valve for direc\u00adtion\u00adal oil drainage. Com\u00adput\u00ader sim\u00adu\u00adla\u00adtions show that the BPS can han\u00addle dis\u00adtur\u00adbances of up to 10 mega\u00adjoules in 80 mil\u00adlisec\u00adonds and 50 bar pres\u00adsure (see the illus\u00adtra\u00adtion below\u00adto see exact\u00adly how this works).<\/p>\n\n\n\n

Five scenarios where the additional passive protection of BPS is particularly worthwhile:<\/h2>\n\n\n\n
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Valuable
components
in the Vicinity<\/h4>\n\n\n
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<\/figure>\n<\/div>\n\n\n
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Reade more<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Valuable
components
in the Vicinity<\/h5>\n\n\n\n

An explo\u00adsion can dam\u00adage near\u00adby com\u00adpo\u00adnents and set them on fire. Addi\u00adtion\u00adal pas\u00adsive pro\u00adtec\u00adtion is there\u00adfore par\u00adtic\u00adu\u00adlar\u00adly rec\u00adom\u00admend\u00aded where there is valu\u00adable infra\u00adstruc\u00adture near\u00adby, such as in sub\u00adsta\u00adtions for high-volt\u00adage direct cur\u00adrent (HVDC) trans\u00admis\u00adsion.<\/p>\n\n\n\n

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Sensitive
Ecosystems<\/h4>\n\n\n
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<\/figure>\n<\/div>\n\n\n
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Reade more<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Sensitive
Ecosystems<\/h5>\n\n\n\n

For trans\u00adform\u00aders close to bod\u00adies of water or in nature reserves, a BPS pre\u00advents mas\u00adsive envi\u00adron\u00admen\u00adtal pol\u00adlu\u00adtion and high clean-up costs in the event of oil leaks.<\/p>\n\n\n\n

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Offshore
Facilities
<\/h4>\n\n\n
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Reade more<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Offshore
Facilities
<\/h5>\n\n\n\n

Infra\u00adstruc\u00adture that is dif\u00adfi\u00adcult to reach, such as off\u00adshore facil\u00adi\u00adties, ben\u00ade\u00adfits from the low\u00ader risk because it would be dif\u00adfi\u00adcult and take a long time to fight fires in case of emer\u00adgency at such loca\u00adtions.<\/p>\n\n\n\n

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Transformers
in Buildings<\/h4>\n\n\n
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<\/figure>\n<\/div>\n\n\n
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Reade more<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Transformers
in Buildings<\/h5>\n\n\n\n

In steel\u00adworks and oth\u00ader fac\u00adto\u00adries, trans\u00adform\u00aders are often locat\u00aded inside of build\u00adings, and an explo\u00adsion here would be a major haz\u00adard for employ\u00adees and could even dam\u00adage the build\u00ading itself.<\/p>\n\n\n\n

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Urban
Environments<\/h4>\n\n\n
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<\/figure>\n<\/div>\n\n\n
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Reade more<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Urban
Environments<\/h5>\n\n\n\n

The more peo\u00adple who live near a trans\u00adformer, the high\u00ader the risk of some\u00adone being injured or suf\u00adfer\u00ading smoke inhala\u00adtion in the event of a dis\u00adas\u00adter. A BPS helps to pre\u00advent such sit\u00adu\u00ada\u00adtions.<\/p>\n\n\n\n

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The BPS was val\u00adi\u00addat\u00aded not only using numer\u00adous sim\u00adu\u00adla\u00adtions, but also in a test with a real arc in coop\u00ader\u00ada\u00adtion with the Chi\u00adnese Elec\u00adtric Pow\u00ader Research Insti\u00adtute (CEPRI) where the engi\u00adneers sub\u00adject\u00aded a test trans\u00adformer equipped with the BPS to the stress of a 5.6 mega\u00adjoule arc with\u00adin 50 mil\u00adlisec\u00adonds. The BPS with\u00adstood the sub\u00adse\u00adquent, rapid\u00adly increas\u00ading pres\u00adsure of around 40 bar, there\u00adby con\u00advinc\u00ading a Chi\u00adnese grid oper\u00ada\u00adtor to retro\u00adfit the first trans\u00adform\u00aders in the field.<\/p>\n\n\n\n

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What happens when it happens:<\/h2>\n\n\n\n
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1. <\/h2>\n\n\n\n

Electric Arc<\/h5>\n\n\n\n
<\/figure>\n\n\n\n

Elec\u00adtric arcs occur when insu\u00adla\u00adtion sec\u00adtions are over\u00adloaded. While most arc flashovers are harm\u00adless, there are also severe ones with ener\u00adgies of sev\u00ader\u00adal mega\u00adjoules. In this exam\u00adple, we are assum\u00ading such a high-ener\u00adgy arc.<\/p>\n<\/div>\n\n\n\n

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2. <\/h1>\n\n\n\n

Pressure Development<\/h5>\n\n\n\n
<\/figure>\n\n\n\n

The brief, immense heat caus\u00ades the sur\u00adround\u00ading insu\u00adlat\u00ading oil to vapor\u00adize and expand due to the result\u00ading gas. A pres\u00adsure relief device opens auto\u00admat\u00adi\u00adcal\u00adly at the top of the OLTC cov\u00ader and releas\u00ades the oil and pres\u00adsure. In our exam\u00adple, how\u00adev\u00ader, this is not enough, and the pres\u00adsure becomes so great that it expands the walls of the OLTC hous\u00ading.<\/p>\n<\/div>\n<\/div>\n\n\n\n

3.<\/h2>\n\n\n\n
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Reinforced Cover<\/h3>\n<\/div>\n\n\n\n
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Normal Cover<\/h3>\n<\/div>\n<\/div>\n\n\n\n
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<\/div>\n\n\n\n
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Internal Relief<\/h2>\n\n\n\n
<\/figure>\n\n\n\n

A rein\u00adforced BPS cov\u00ader with\u00adstands the pres\u00adsure which instead breaks open the bot\u00adtom of the OLTC hous\u00ading and escapes into the trans\u00adformer. The flex\u00adi\u00adbil\u00adi\u00adty of the trans\u00adformer tank is such that it absorbs all the ener\u00adgy with\u00adout oil escap\u00ading uncon\u00adtrol\u00adlably. If nec\u00ades\u00adsary, the transformer\u2019s pres\u00adsure relief device releas\u00ades oil into a pan which allows the envi\u00adron\u00adment to remain unaf\u00adfect\u00aded.<\/p>\n<\/div>\n\n\n\n

<\/div>\n<\/div>\n<\/div>\n\n\n\n
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<\/div>\n\n\n\n
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Explosion<\/h2>\n\n\n\n
<\/figure>\n\n\n\n

If the pres\u00adsure increas\u00ades too much or too sud\u00adden\u00adly, the OLTC cov\u00ader bursts, releas\u00ading a surge of oil and steam which can ignite and con\u00adt\u00ada\u00adm\u00adi\u00adnate the sur\u00adround\u00adings.<\/p>\n<\/div>\n\n\n\n

<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n
<\/div>\n\n\n\n
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<\/figure>\n<\/div>\n\n\n

YOUR CONTACT PERSON<\/h2>\n\n\n\n

Do you have any ques\u00adtions about the BPS \u2014 Burst Pre\u00adven\u00adtion Sys\u00adtem?<\/strong>
Mar\u00adtin Guth is here for you:
<\/i>\u2009 M.Guth@reinhausen.com<\/a><\/p>\n<\/div><\/div>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

It hard\u00adly ever hap\u00adpens; but if it does, it can end bad\u00adly: a trans\u00adformer fire after a flashover. A new pas\u00adsive pro\u00adtec\u00adtion sys\u00adtem from MR pro\u00adtects oper\u00ada\u00adtors from seri\u00adous dam\u00adage in such cas\u00ades.<\/p>\n","protected":false},"author":4,"featured_media":12895,"comment_status":"closed","ping_status":"open","sticky":false,"template":"template-cover.php","format":"standard","meta":{"_acf_changed":false,"wp_typography_post_enhancements_disabled":false,"footnotes":""},"categories":[43],"tags":[],"class_list":["post-12886","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-12-2024"],"acf":[],"_links":{"self":[{"href":"https:\/\/onload.reinhausen.com\/en\/wp-json\/wp\/v2\/posts\/12886","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onload.reinhausen.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/onload.reinhausen.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/onload.reinhausen.com\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/onload.reinhausen.com\/en\/wp-json\/wp\/v2\/comments?post=12886"}],"version-history":[{"count":8,"href":"https:\/\/onload.reinhausen.com\/en\/wp-json\/wp\/v2\/posts\/12886\/revisions"}],"predecessor-version":[{"id":13602,"href":"https:\/\/onload.reinhausen.com\/en\/wp-json\/wp\/v2\/posts\/12886\/revisions\/13602"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/onload.reinhausen.com\/en\/wp-json\/wp\/v2\/media\/12895"}],"wp:attachment":[{"href":"https:\/\/onload.reinhausen.com\/en\/wp-json\/wp\/v2\/media?parent=12886"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/onload.reinhausen.com\/en\/wp-json\/wp\/v2\/categories?post=12886"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/onload.reinhausen.com\/en\/wp-json\/wp\/v2\/tags?post=12886"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}