\n
\nAnoth\u00ader advan\u00adtage of esters is that they make trans\u00adform\u00aders safer to use thanks to a low lev\u00adel of flam\u00adma\u00adbil\u00adi\u00adty \u2013 putting them in a cat\u00ade\u00adgo\u00adry referred to as class K\u2014with a com\u00adbus\u00adtion point above 300 degrees Cel\u00adsius. This means that the fire load of this alter\u00adna\u00adtive insu\u00adlat\u00ading mate\u00adr\u00adi\u00adal is much low\u00ader than oth\u00ader types, and that any fires which do break out can be extin\u00adguished eas\u00adi\u00adly. In sharp con\u00adtrast, trans\u00adformer fires involv\u00ading min\u00ader\u00adal oil are extreme\u00adly dif\u00adfi\u00adcult to quench. As such, esters eas\u00adi\u00adly com\u00adply with safe\u00adty requirements\u2014even the very strict ones\u2014that are imposed on high-volt\u00adage instal\u00adla\u00adtions in dense\u00adly pop\u00adu\u00adlat\u00aded urban areas and relate to fire pre\u00adven\u00adtion, tox\u00adic fumes, and explo\u00adsion dam\u00adage in the event of a mal\u00adfunc\u00adtion.<\/p>\n
Since there is already a clear trend toward the use of ester trans\u00adform\u00aders, why not make the most of fur\u00adther advan\u00adtages of these insulat\u00ading liq\u00aduids? Esters have a high\u00ader com\u00adbus\u00adtion point than min\u00ader\u00adal oil, allow\u00ading for oper\u00adat\u00ading tem\u00adper\u00ada\u00adtures of up to 150 degrees Cel\u00adsius (as com\u00adpared with 115 degrees Cel\u00adsius in trans\u00adform\u00aders that use min\u00ader\u00adal oil). If on-load tap-chang\u00aders and motor-dri\u00adve units are also able to with\u00adstand oper\u00adat\u00ading tem\u00adper\u00ada\u00adtures of this mag\u00adni\u00adtude, then this means that a trans\u00adformer will be able to trans\u00adfer more pow\u00ader but with\u00adout hav\u00ading to increase in size.<\/p>\n
NEW OPPORTUNITY<\/h2>\n
MR has made sev\u00ader\u00adal devel\u00adop\u00adments with this in mind: Its VACUTAP\u00ae VR\u00ae high-tem\u00adper\u00ada\u00adture on-load tap-chang\u00aders, DEETAP\u00ae DU high-tem\u00adper\u00ada\u00adture de-ener\u00adgized tap-chang\u00aders, and TAPMOTION\u00ae ED motor-dri\u00adve units allow ester trans\u00adform\u00aders to run in a con\u00adtrolled over\u00adload state over sev\u00ader\u00adal weeks or months. This new oppor\u00adtu\u00adni\u00adty is set to ben\u00ade\u00adfit trans\u00adformer oper\u00ada\u00adtors in megac\u00adi\u00adties and mobile appli\u00adca\u00adtions in par\u00adtic\u00adu\u00adlar.<\/p>\n
A Solution for Megacities<\/h2>\n
In large cities, oper\u00ada\u00adtors are repeat\u00adedly con\u00adfront\u00aded with the need to main\u00adtain more infra\u00adstruc\u00adture in a con\u00adsis\u00adtent\u00adly small space due to the increas\u00ading demand for ener\u00adgy. High-tem\u00adper\u00ada\u00adture trans\u00adform\u00aders are the ide\u00adal solu\u00adtion here. They are able to achieve the same per\u00adfor\u00admance with a reduced size, or high\u00ader per\u00adfor\u00admance with the same size. When trans\u00adform\u00aders are being replaced, the exist\u00ading foun\u00adda\u00adtion can nor\u00admal\u00adly be used with\u00adout the need to extend it. In many cas\u00ades, the result\u00ading con\u00adstruc\u00adtion cost sav\u00adings alone bal\u00adance out the acqui\u00adsi\u00adtion costs of ester insu\u00adlat\u00ading flu\u00adid, which are rough\u00adly dou\u00adble com\u00adpared to min\u00ader\u00adal oil.<\/p>\n
\u201cNot only can trans\u00adform\u00aders that oper\u00adate with esters deliv\u00ader more pow\u00ader, they are also safer.\u201d<\/p><\/blockquote>\n
Oper\u00ada\u00adtors of mobile trans\u00adform\u00aders can also ben\u00ade\u00adfit from a more com\u00adpact struc\u00adture that deliv\u00aders the same lev\u00adel of per\u00adfor\u00admance: A trans\u00adformer of this kind can reach its des\u00adti\u00adna\u00adtion more quick\u00adly in the event of an emer\u00adgency, since obsta\u00adcles such as low bridges no longer pose an issue, and the low\u00ader weight makes trans\u00adporta\u00adtion eas\u00adi\u00ader too.<\/p>\n
What also makes these mobile trans\u00adform\u00aders so resilient in emer\u00adgency sit\u00adu\u00ada\u00adtions is their max\u00adimum over\u00adload capa\u00adbil\u00adi\u00adty of 150 degrees Cel\u00adsius, which they are able to main\u00adtain over an extend\u00aded peri\u00adod. Addi\u00adtion\u00adal\u00adly, it is worth not\u00ading that safe\u00ad\u00adty restric\u00adtions in many coun\u00adtries, the USA includ\u00aded, pro\u00adhib\u00adit the trans\u00adporta\u00adtion of trans\u00adform\u00aders filled with min\u00aderal oil\u2014so in these cas\u00ades, ester trans\u00adform\u00aders are the go-to solu\u00adtion. With MR equip\u00adment added to them, they then become high-tem\u00adper\u00ada\u00adture trans\u00adform\u00aders.<\/p>\n
Service Life Put to the Test<\/h3>\n
On-load tap-chang\u00aders can also be filled with esters as an insu\u00adlat\u00ading flu\u00adid to make them capa\u00adble of withstand\u00ading high tem\u00adper\u00ada\u00adtures. Syn\u00adthet\u00adic or nat\u00adur\u00adal esters are both options, but nat\u00adur\u00adal esters are gen\u00ader\u00adal\u00adly pre\u00adferred due to their car\u00adbon-neu\u00adtral cre\u00adden\u00adtials, which make them an espe\u00adcial\u00adly eco-friend\u00adly choice.<\/p>\n
While esters in trans\u00adform\u00aders are only required to cool and elec\u00adtri\u00adcal\u00adly insu\u00adlate active parts and bush\u00adings, in on-load tap-chang\u00aders they need to meet four addi\u00adtion\u00adal cri\u00adte\u00adria in order to ensure that the equip\u00adment main\u00adtains a long oper\u00adat\u00ading life. These cri\u00adte\u00adria relate to lubric\u00adi\u00adty, arc elim\u00adi\u00adna\u00adtion behav\u00adior, vis\u00adcos\u00adi\u00adty, and com\u00adpat\u00adi\u00adbil\u00adi\u00adty with oth\u00ader mate\u00adri\u00adals. MR has been inves\u00adti\u00adgat\u00ading esters for use in on-load tap-chang\u00aders and de-ener\u00adgized tap-chang\u00aders as part of a com\u00adpre\u00adhen\u00adsive series of tests span\u00adning more than ten years.<\/p>\n
\n
- <\/i><\/span> Where lubric\u00adi\u00adty is con\u00adcerned, it has not been pos\u00adsi\u00adble to iden\u00adti\u00adfy any notable dif\u00adfer\u00adence between esters and min\u00ader\u00adal oil, which has already been tried and test\u00aded in this area.<\/li>\n
- <\/i><\/span> The behav\u00adior that esters demon\u00adstrate in elim\u00adi\u00adnat\u00ading arcs is not as good as that of min\u00ader\u00adal oil. This is of lit\u00adtle con\u00adse\u00adquence to on-load tap-chang\u00aders that use vac\u00adu\u00adum-switch\u00ading tech\u00adnol\u00ado\u00adgy, how\u00adever, as any switch\u00ading arcs that do occur are ful\u00adly encap\u00adsu\u00adlat\u00aded with\u00adin the her\u00admet\u00adi\u00adcal\u00adly sealed vac\u00adu\u00adum inter\u00adrupters. Addi\u00adtion\u00adal\u00adly, the only kind of wear that esters under\u00adgo in vac\u00adu\u00adum switch\u00ades is ther\u00admal aging, which means that there is usu\u00adal\u00adly no need to change the insu\u00adlat\u00ading flu\u00adid at any point dur\u00ading the tap changer\u2019s ser\u00advice life. Using esters in de-ener\u00adgized tap-chang\u00aders some\u00adtimes requires a high\u00ader lev\u00adel of dielec\u00adtric strength, although this can be resolved through actions such as opt\u00ading for a high\u00ader volt\u00adage range (in Um).<\/li>\n
- <\/i><\/span> Esters are much more vis\u00adcous than min\u00ader\u00adal oil, but this has only had a mod\u00ader\u00adate impact on switch\u00ading behav\u00adior in cold con\u00addi\u00adtions dur\u00ading test\u00ading, where it has been shown that the low\u00ader tem\u00adper\u00ada\u00adture lim\u00adit of esters is slight\u00adly above that of min\u00ader\u00adal oil.<\/li>\n
- <\/i><\/span> In mate\u00adr\u00adi\u00adal com\u00adpat\u00adi\u00adbil\u00adi\u00adty tests, we have iden\u00adti\u00adfied that seals with cer\u00adtain rub\u00adber for\u00admu\u00adla\u00adtions become hard and brit\u00adtle in syn\u00adthet\u00adic esters, but swollen and soft in nat\u00adur\u00adal ones. In appli\u00adca\u00adtions involv\u00ading esters, MR there\u00adfore uses only Viton seals as they have proven them\u00adselves to be ful\u00adly com\u00adpat\u00adi\u00adble with this kind of flu\u00adid. While the plas\u00adtics used in on-load tap-chang\u00aders do not react with esters, they still need to with\u00adstand the high\u00ader tem\u00adper\u00ada\u00adtures at which the equip\u00adment is run\u2026 To achieve this, MR uses spe\u00adcial high-tech plas\u00adtics that under\u00adgo nei\u00adther elas\u00adtic nor plas\u00adtic defor\u00adma\u00adtion even when they are exposed to excep\u00adtion\u00adal\u00adly high oper\u00adat\u00ading tem\u00adper\u00ada\u00adtures.<\/li>\n<\/ul>\n
Fol\u00adlow\u00ading exten\u00adsive rounds of test\u00ading and sev\u00ader\u00adal hun\u00addred instal\u00adla\u00adtions of ester-based on-load tap-chang\u00aders in the field, includ\u00ading spe\u00adcial appli\u00adca\u00adtions such as trac\u00adtion trans\u00adform\u00aders and test-field trans\u00adformers, MR can say with cer\u00adtain\u00adty that oper\u00ada\u00adtors will get much bet\u00adter per\u00adfor\u00admance out of their ester trans\u00adform\u00aders if they use high-tem\u00adper\u00ada\u00adture on-load tap-changers\u2014and will ben\u00ade\u00adfit from safe oper\u00ada\u00adtion through\u00adout the equipment\u2019s ser\u00advice life.<\/p>\n
\nYOUR CONTACT<\/h2>\n
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