{"id":10764,"date":"2026-08-29T23:43:18","date_gmt":"2026-08-29T15:43:18","guid":{"rendered":"https:\/\/q8bbzjnpm5.wpdns.site\/?p=10764"},"modified":"2026-08-29T23:43:18","modified_gmt":"2026-08-29T15:43:18","slug":"key-questions-epcs-must-ask-before-finalizing-a-transformer-supplier-complete-guide","status":"publish","type":"post","link":"https:\/\/subian-electric.com\/pt\/news\/key-questions-epcs-must-ask-before-finalizing-a-transformer-supplier-complete-guide\/","title":{"rendered":"Perguntas-chave que os EPCs Devem Fazer Antes de Finalizar um Fornecedor de Transformadores | Guia Completo"},"content":{"rendered":"<p>Uma empresa EPC fechou um contrato para solar-plus-storage de 230 MW nas Filipinas. Os clientes est\u00e3o exigindo que os transformadores sejam entregues no local em 26 semanas. O gerente de compras tem tr\u00eas fornecedores pr\u00e9-selecionados, duas cota\u00e7\u00f5es cujos pre\u00e7os variam em quase 40 por cento, e um cronograma de projeto que n\u00e3o pode ser violado. Se voc\u00ea j\u00e1 esteve nessa posi\u00e7\u00e3o antes, sabe que escolher o fornecedor de transformadores determinar\u00e1 se sua subesta\u00e7\u00e3o pode ser energizada a tempo ou se o cliente invocar\u00e1 as multas conforme a cl\u00e1usula de danos liquidados.<\/p>\n<p>Este guia discute v\u00e1rios aspectos que os EPCs devem investigar e considerar ao selecionar um fornecedor de transformadores, permitindo que eles construam uma matriz de pontua\u00e7\u00e3o eficaz para os fornecedores. Abordaremos a capacidade de fabrica\u00e7\u00e3o, comprova\u00e7\u00e3o de testes, certifica\u00e7\u00e3o, pol\u00edtica de pre\u00e7os, documenta\u00e7\u00e3o necess\u00e1ria e servi\u00e7os p\u00f3s-venda, fornecendo assim os n\u00fameros necess\u00e1rios para uma compara\u00e7\u00e3o adequada. Assim, ao final deste guia, voc\u00ea obter\u00e1 uma lista de verifica\u00e7\u00e3o reutiliz\u00e1vel que pode ser aplicada em qualquer um de seus projetos de energia, como um projeto de transformador de 315kVA ou um projeto envolvendo um transformador de 120 MVA.<\/p>\n<blockquote><p>De forma resumida, antes de selecionar qualquer fabricante de transformadores, os EPCs precisam verificar cinco \u00e1reas de preocupa\u00e7\u00e3o: (1) Capacidade de fabrica\u00e7\u00e3o e prazos realistas, que normalmente est\u00e3o na faixa de 8 a 16 semanas para transformadores de distribui\u00e7\u00e3o, enquanto transformadores de pot\u00eancia maiores levam de 20 a 32 semanas; (2) Possuir instala\u00e7\u00f5es de teste adequadas e comprova\u00e7\u00e3o de conformidade com IEC\/IEEE; (3) Informa\u00e7\u00f5es completas de pre\u00e7os com custos de unidades de distribui\u00e7\u00e3o imersas em \u00f3leo variando de $3000 a $45.000 e transformadores de pot\u00eancia custando de $50.000 a $1,2 milh\u00e3o, dependendo da classifica\u00e7\u00e3o do equipamento; (4) Conhecimento sobre a capacidade da empresa de fornecer a documenta\u00e7\u00e3o t\u00e9cnica, desenhos, relat\u00f3rios de teste e registros de conformidade; e (5) Compromissos de servi\u00e7o do fornecedor, que podem incluir comissionamento no local e garantia de 12 a 60 meses de dura\u00e7\u00e3o.<\/p><\/blockquote>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10765\" src=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/Key-Questions-Epcs-Must-Ask-Before-Finalizing-A-Transformer-Supplier-Complete-Guide.webp\" alt=\"Key Questions Epcs Must Ask Before Finalizing A Transformer Supplier Complete Guide\" width=\"1448\" height=\"1086\" \/><\/p>\n<hr \/>\n<h2 id=\"why-supplier-matters\">Por que a Sele\u00e7\u00e3o de Fornecedores Define o Risco do Projeto EPC<\/h2>\n<p>Para o contratante de engenharia, compras e constru\u00e7\u00e3o (EPC), a import\u00e2ncia de um transformador n\u00e3o pode ser subestimada. \u00c9 um dos elementos que impulsionam o caminho cr\u00edtico em um projeto e possui um longo processo de fabrica\u00e7\u00e3o, enquanto a falha pode levar a uma subesta\u00e7\u00e3o inteira a ficar inoperante. Com base na pesquisa Cigr\u00e9 A2.37, a condi\u00e7\u00e3o do isolamento e o processo de fabrica\u00e7\u00e3o s\u00e3o as principais causas de falhas prematuras, e na maioria dos casos, isso se resume a aspectos que o teste de aceita\u00e7\u00e3o na f\u00e1brica deve detectar.<\/p>\n<p>O pre\u00e7o de um transformador de 10 MVA pode ser t\u00e3o baixo quanto 5 \u2013 15% do or\u00e7amento de uma subesta\u00e7\u00e3o de tamanho m\u00e9dio, enquanto uma unidade de 100 MVA pode representar aproximadamente 25 \u2013 40% do investimento de capital de uma esta\u00e7\u00e3o maior. A economia de 12% em um transformador no valor de $400,000 geraria $48,000 em fluxo de caixa positivo, sem mencionar que uma interrup\u00e7\u00e3o poderia variar de $50,000 a $2 milh\u00f5es. Muitas vezes, um pre\u00e7o baixo significa um longo risco na cadeia de suprimentos.<\/p>\n<h2 id=\"what-epc-procurement\">O que torna a aquisi\u00e7\u00e3o de transformadores diferente para EPCs<\/h2>\n<p>Enquanto a maioria dos equipamentos que um EPC compra prontos para uso pode ser substitu\u00edda se for considerada defeituosa, os transformadores s\u00e3o feitos sob medida, e a configura\u00e7\u00e3o do enrolamento, o trocador de tomadas, o padr\u00e3o de resfriamento e as perdas s\u00e3o todos adaptados aos requisitos de um c\u00f3digo de rede espec\u00edfico e da localiza\u00e7\u00e3o. Por essa raz\u00e3o, a aquisi\u00e7\u00e3o deve ocorrer antes da precifica\u00e7\u00e3o: as principais empresas EPC emitem um RFQ referindo-se \u00e0 IEC 60076-1 e IEC 60076-11 (ou IEEE C57.12.00 para a Am\u00e9rica do Norte) e pedem para receber uma resposta por escrito para cada ponto.<\/p>\n<h2 id=\"capacity-leadtime\">Perguntas sobre Capacidade de Fabrica\u00e7\u00e3o e Prazo de Entrega<\/h2>\n<p>O prazo de entrega \u00e9 o par\u00e2metro mais crucial porque este \u00e9 o n\u00famero mais complicado de verificar. Fa\u00e7a as seguintes perguntas aos candidatos e observe as respostas vagas:<\/p>\n<ul>\n<li>Qual \u00e9 o seu backlog de pedidos agora e quantas unidades voc\u00ea pode enviar a cada m\u00eas? Um fabricante promete 500 unidades por m\u00eas enquanto usa apenas 60% de capacidade, o que significa que est\u00e1 utilizando o cronograma de outra pessoa.<\/li>\n<li>Voc\u00ea poderia me fornecer um cronograma de produ\u00e7\u00e3o semana a semana e os nomes dos \u00faltimos tr\u00eas clientes cujos pedidos voc\u00ea completou? Refer\u00eancias telef\u00f4nicas s\u00e3o muito superiores a brochuras.<\/li>\n<li>Voc\u00ea realiza lamina\u00e7\u00e3o de n\u00facleo, enrolamento e fabrica\u00e7\u00e3o de tanque internamente? O processo de produ\u00e7\u00e3o interno \u00e9 prop\u00edcio para um prazo de entrega mais curto, enquanto a terceiriza\u00e7\u00e3o completa aumenta o risco de problemas de coordena\u00e7\u00e3o.<\/li>\n<li>Qual \u00e9 o seu prazo de entrega para um transformador t\u00edpico de 10 MVA 33\/11 kV? Os n\u00fameros realistas s\u00e3o: 10-14 semanas para transformadores de distribui\u00e7\u00e3o padr\u00e3o, 14-20 semanas para pot\u00eancia m\u00e9dia e 22-32 semanas para transformador de 100 MVA.<\/li>\n<li>Quais Incoterms voc\u00ea usa para definir a entrega, e quem \u00e9 respons\u00e1vel pelos riscos de frete mar\u00edtimo? O pre\u00e7o CIF parece promissor at\u00e9 que a embalagem inadequada cause um bushing danificado na entrega.<\/li>\n<\/ul>\n<p>Certifique-se de adicionar uma conting\u00eancia de 15-20% aos prazos de entrega cotados, para verificar as informa\u00e7\u00f5es fornecidas por dois clientes recentes no exterior e para solicitar penalidades por marcos no contrato.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10766\" src=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/Testing-Certification-and-Standards-Compliance-Questions.webp\" alt=\"Perguntas sobre Testes, Certifica\u00e7\u00e3o e Conformidade com Normas\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2 id=\"testing-certification\">Perguntas sobre Testes, Certifica\u00e7\u00e3o e Conformidade com Normas<\/h2>\n<p>A certifica\u00e7\u00e3o \u00e9 o ponto onde as equipes de aquisi\u00e7\u00e3o podem garantir o projeto ou criar uma responsabilidade potencial no futuro. As perguntas precisam ir al\u00e9m da marca\u00e7\u00e3o CE, que \u00e9 apenas uma declara\u00e7\u00e3o auto-certificada e n\u00e3o garante um alto desempenho do transformador.<\/p>\n<ul>\n<li>Sua f\u00e1brica possui ISO 9001 e podemos audit\u00e1-la? Apenas fornecedores respeit\u00e1veis a possuem, enquanto a pergunta inevit\u00e1vel \u00e9 se \u00e9 poss\u00edvel realizar uma auditoria no local.<\/li>\n<li>Voc\u00ea pode nos fornecer relat\u00f3rios de teste de tipo de acordo com a IEC 60076 e testemunhados por um \u00f3rg\u00e3o acreditado? Certifique-se de verificar os relat\u00f3rios de teste de aumento de temperatura, impulso de raios e resist\u00eancia a curto-circuito, assinados pelo engenheiro do cliente.<\/li>\n<li>Quais padr\u00f5es voc\u00ea segue ao fabricar os transformadores? IEC 60076-1\/-5\/-11 ou IEEE C57.12.00? Confirme antes de verificar cota\u00e7\u00f5es de diferentes fornecedores.<\/li>\n<li>Qual \u00e9 o seu procedimento de teste? Deve incluir resist\u00eancia de enrolamento, rela\u00e7\u00e3o de transforma\u00e7\u00f5es, grupo vetorial, perdas em vazio\/carga, resist\u00eancia de isolamento e testes de tens\u00e3o induzida.<\/li>\n<li>Voc\u00ea \u00e9 capaz de realizar testes adicionais como medi\u00e7\u00e3o de descarga parcial ou DGA ap\u00f3s os testes de f\u00e1brica? Esses testes ajudar\u00e3o a detectar defeitos de isolamento antes do envio.<\/li>\n<\/ul>\n<p>Os l\u00edderes de mercado alocam aproximadamente 5 a 10 por cento do pre\u00e7o do produto para testes. Se uma cota\u00e7\u00e3o for muito mais baixa, pe\u00e7a para esclarecer quais testes foram exclu\u00eddos.<\/p>\n<p>N\u00e3o se esque\u00e7a de confirmar o pacote de documenta\u00e7\u00e3o enviado junto com os produtos, pois isso determinar\u00e1 a aprova\u00e7\u00e3o dos produtos, seguros e reivindica\u00e7\u00f5es de garantia.<\/p>\n<table>\n<thead>\n<tr>\n<th>Entreg\u00e1vel<\/th>\n<th>Cronograma<\/th>\n<th>Por que isso \u00e9 importante<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Desenhos GA \/ n\u00facleo e bobina<\/td>\n<td>Dentro de 2 semanas ap\u00f3s o pedido<\/td>\n<td>Projeto civil e estrutural<\/td>\n<\/tr>\n<tr>\n<td>Relat\u00f3rios de teste de tipo<\/td>\n<td>Com a cota\u00e7\u00e3o<\/td>\n<td>Evid\u00eancia de conformidade com os padr\u00f5es<\/td>\n<\/tr>\n<tr>\n<td>Relat\u00f3rio de teste de rotina<\/td>\n<td>Com cada remessa<\/td>\n<td>Aceita\u00e7\u00e3o e garantia<\/td>\n<\/tr>\n<tr>\n<td>Manual de O&amp;M<\/td>\n<td>Antes da comissionamento<\/td>\n<td>Treinamento de operadores<\/td>\n<\/tr>\n<tr>\n<td>Certificado de garantia<\/td>\n<td>Com a fatura final<\/td>\n<td>Base de reivindica\u00e7\u00f5es<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 id=\"engineering-support\">Suporte de engenharia e Teste de Aceita\u00e7\u00e3o de F\u00e1brica<\/h2>\n<p>H\u00e1 uma grande necessidade de integra\u00e7\u00e3o entre transformadores e os rel\u00e9s de prote\u00e7\u00e3o, dispositivos de controle de troca de tap e SCADA. Voc\u00ea deve consultar a equipe de engenharia sobre isso:<\/p>\n<ul>\n<li>Voc\u00ea fornece os desenhos GA, n\u00facleo &amp; bobina e layout de terminais duas semanas ap\u00f3s o recebimento do pedido? O atraso na entrega dos desenhos causa atrasos nos trabalhos civis e nos projetos estruturais.<\/li>\n<li>Voc\u00ea \u00e9 capaz de alterar o projeto para se adequar a alta altitude (mais de 1000 m), alta umidade, zonas s\u00edsmicas ou ar costeiro contendo sais? Voc\u00ea deve saber que, entre outras coisas, a norma IEC 60076-1 fala sobre desclassifica\u00e7\u00e3o por altitude. Um fabricante incapaz de operar em clima tropical pode acabar usando buchas subdimensionadas.<\/li>\n<li>Voc\u00ea est\u00e1 pronto para verificar a coordena\u00e7\u00e3o das configura\u00e7\u00f5es do rel\u00e9 com seu pr\u00f3prio trocador de tap e a l\u00f3gica do rel\u00e9 Bucholz? Esta \u00e9 uma raz\u00e3o muito frequente para atrasos na comissionamento.<\/li>\n<li>Seus engenheiros est\u00e3o dispon\u00edveis para pr\u00e9-comissionamento? Isso deve cobrir 1-2 visitas ao local para que os problemas na fase de comissionamento possam ser resolvidos por voc\u00ea.<\/li>\n<\/ul>\n<p>O teste de aceita\u00e7\u00e3o \u00e9 a \u00faltima oportunidade de impedir que o transformador seja enviado. Os EPCs precisam fazer as seguintes perguntas:<\/p>\n<ul>\n<li>Podemos ter nosso engenheiro ou um terceiro testemunhar o FAT para cada pe\u00e7a de equipamento? Para contratos de m\u00faltiplos equipamentos, vale a pena negociar o teste de testemunha para ser conclu\u00eddo em 100% dos casos.<\/li>\n<li>What will happen if any piece fails routine check-up during FAT? Make sure you discuss the rules and regulations on retesting of the equipment.<\/li>\n<li>Will you provide test report package for each shipment? It is very important for acceptance, insurance, and warranty reasons.<\/li>\n<li>What does the quality control cover regarding insulation? Ask about drying cycles, vacuum filling, oil humidity below 10-15 ppm, etc.<\/li>\n<li>Is the short-circuit withstand design covered by IEC 60076-5?<\/li>\n<\/ul>\n<h2 id=\"transformer-types\">Transformer Types EPCs Procure (Classification Table)<\/h2>\n<p>In EPC projects carried out in the fields of renewables, utilities, and industry, there is a need to procure several transformer types with different completion times and costs.<\/p>\n<table>\n<thead>\n<tr>\n<th>Tipo<\/th>\n<th>Faixa T\u00edpica de Classifica\u00e7\u00e3o<\/th>\n<th>Resfriamento<\/th>\n<th>Typical Lead Time<\/th>\n<th>Price Range (FOB)<\/th>\n<th>Key Procurement Concern<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Distribution transformer (pole\/pad)<\/td>\n<td>25\u20132.500 kVA<\/td>\n<td>Mineral oil \/ dry-type<\/td>\n<td>6\u201312 weeks<\/td>\n<td>$1,200\u2013$25,000<\/td>\n<td>Loss levels, moisture ingress<\/td>\n<\/tr>\n<tr>\n<td>Skid \/ unit substation transformer<\/td>\n<td>315\u20132,500 kVA<\/td>\n<td>Mineral oil \/ cast resin<\/td>\n<td>8\u201314 semanas<\/td>\n<td>$8,000\u2013$45,000<\/td>\n<td>Enclosure rating, cable entry<\/td>\n<\/tr>\n<tr>\n<td>Medium power transformer<\/td>\n<td>5\u201340 MVA<\/td>\n<td>Oil with ONAN\/ONAF<\/td>\n<td>12\u201320 weeks<\/td>\n<td>$45,000\u2013$250,000<\/td>\n<td>On-load tap changer, losses<\/td>\n<\/tr>\n<tr>\n<td>Large power transformer<\/td>\n<td>60\u2013300 MVA<\/td>\n<td>Oil, ODAF\/ODWF<\/td>\n<td>24\u201340 weeks<\/td>\n<td>$300,000\u2013$1.5 million<\/td>\n<td>Type tests, transport weight<\/td>\n<\/tr>\n<tr>\n<td>Dry-type \/ cast-resin transformer<\/td>\n<td>100\u201310.000 kVA<\/td>\n<td>Air, F0\/F1 class<\/td>\n<td>8\u201314 semanas<\/td>\n<td>$6,000\u2013$90,000<\/td>\n<td>Partial discharge, fire safety<\/td>\n<\/tr>\n<tr>\n<td>Specialty (furnace, rectifier, earthing)<\/td>\n<td>Personalizado<\/td>\n<td>Oil \/ dry<\/td>\n<td>16\u201330 weeks<\/td>\n<td>$30,000\u2013$600,000<\/td>\n<td>Custom winding design<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 id=\"specifications\">Key Specification Parameters to Verify<\/h2>\n<p>When comparing bids, one needs to perform normalization of the technical requirements between different types of transformers, so the following parameters should be outlined in the RFQ and confirmed in every quotation:<\/p>\n<table>\n<thead>\n<tr>\n<th>Par\u00e2metro<\/th>\n<th>What It Controls<\/th>\n<th>Valor T\u00edpico<\/th>\n<th>Relevant Standard<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Rated power (kVA\/MVA)<\/td>\n<td>Capacity and size<\/td>\n<td>100 kVA\u2013300 MVA<\/td>\n<td>IEC 60076-1<\/td>\n<\/tr>\n<tr>\n<td>Voltage ratio and vector group<\/td>\n<td>Grid interface<\/td>\n<td>e.g. 33\/11 kV Dyn11<\/td>\n<td>IEC 60076-1<\/td>\n<\/tr>\n<tr>\n<td>No-load and load losses<\/td>\n<td>Energy cost over life<\/td>\n<td>e.g. 10 MVA: ~11 kW NL \/ ~65 kW LL<\/td>\n<td>IEC 60076-1, IEC 60076-19<\/td>\n<\/tr>\n<tr>\n<td>Tens\u00e3o de imped\u00e2ncia<\/td>\n<td>Fault level and voltage drop<\/td>\n<td>4\u201312.5%<\/td>\n<td>IEC 60076-5<\/td>\n<\/tr>\n<tr>\n<td>Classe de resfriamento<\/td>\n<td>Continuous loading capability<\/td>\n<td>ONAN, ONAF, OFAF<\/td>\n<td>IEC 60076-2<\/td>\n<\/tr>\n<tr>\n<td>Temperature rise limits<\/td>\n<td>Insulation aging<\/td>\n<td>65 K oil \/ 78 K winding (OA)<\/td>\n<td>IEC 60076-2<\/td>\n<\/tr>\n<tr>\n<td>Insulation level (BIL)<\/td>\n<td>Withstand to lightning<\/td>\n<td>e.g. 33 kV: 170\u2013200 kV BIL<\/td>\n<td>IEC 60076-3<\/td>\n<\/tr>\n<tr>\n<td>Comutador de deriva\u00e7\u00e3o<\/td>\n<td>Regula\u00e7\u00e3o de tens\u00e3o<\/td>\n<td>\u00b15%, \u00b110%, DETC or OLTC<\/td>\n<td>IEC 60214<\/td>\n<\/tr>\n<tr>\n<td>N\u00edvel de ru\u00eddo<\/td>\n<td>Environmental compliance<\/td>\n<td>55\u201385 dB(A)<\/td>\n<td>IEC 60076-10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>If two quotations vary due to loss discrepancies, one has to use the capitalized expense method. The no-load loss should be multiplied by a figure between $2,000\u2013$6,000\/kW and the load loss should be multiplied by a figure between $400\u2013$1,200\/kW. This way, the position of a low-cost transformer with high losses in the rating will change as compared to that of a high-cost transformer with low losses.<\/p>\n<h2 id=\"brands-prices\">Brand Comparison and Price Benchmarks<\/h2>\n<p>The global transformer market includes leading global brands and specific producers; a fair comparison requires standardizing rating, losses, testing range, and Incoterms for all brands. The table shows some typical price ranges for a 10 MVA 33\/11 kV oil-filled transformer as well as a 1000 kVA distribution transformer. Price levels depend on the specifications and location.<\/p>\n<table>\n<thead>\n<tr>\n<th>Brand \/ Manufacturer<\/th>\n<th>Origem<\/th>\n<th>10 MVA 33\/11 kV Price<\/th>\n<th>1,000 kVA Distrib. Price<\/th>\n<th>Typical Lead Time<\/th>\n<th>Strength<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>ABB<\/td>\n<td>Su\u00ed\u00e7a<\/td>\n<td>$180,000\u2013$320,000<\/td>\n<td>$15,000\u2013$28,000<\/td>\n<td>20\u201332 weeks<\/td>\n<td>Global service network, grid references<\/td>\n<\/tr>\n<tr>\n<td>Siemens Energy<\/td>\n<td>Alemanha<\/td>\n<td>$200,000\u2013$350,000<\/td>\n<td>$16,000\u2013$30,000<\/td>\n<td>22\u201334 weeks<\/td>\n<td>Digital transformer, R&amp;D depth<\/td>\n<\/tr>\n<tr>\n<td>Schneider Electric<\/td>\n<td>Fran\u00e7a<\/td>\n<td>$170,000\u2013$310,000<\/td>\n<td>$14.000\u2013$26.000<\/td>\n<td>20\u201330 semanas<\/td>\n<td>Package solutions, medium voltage<\/td>\n<\/tr>\n<tr>\n<td>Hitachi Energy<\/td>\n<td>Switzerland\/Japan<\/td>\n<td>$190,000\u2013$340,000<\/td>\n<td>$15,000\u2013$27,000<\/td>\n<td>22\u201336 weeks<\/td>\n<td>HVDC and large power transformer expertise<\/td>\n<\/tr>\n<tr>\n<td>Hyosung, Hyundai, ILJIN (Korea)<\/td>\n<td>South Korea<\/td>\n<td>$150,000\u2013$280,000<\/td>\n<td>$12.000\u2013$22.000<\/td>\n<td>18\u201328 weeks<\/td>\n<td>Consistent quality, strong test labs<\/td>\n<\/tr>\n<tr>\n<td>Major Chinese OEMs (TBEA, Baoding Tianwei, etc.)<\/td>\n<td>China<\/td>\n<td>$90,000\u2013$180,000<\/td>\n<td>$7,000\u2013$14,000<\/td>\n<td>12\u201320 weeks<\/td>\n<td>Capacity, cost, IEC certified exports<\/td>\n<\/tr>\n<tr>\n<td>Mid-tier Chinese exporters (e.g. Jiangsu Subian Electric Power)<\/td>\n<td>China<\/td>\n<td>$80,000\u2013$150,000<\/td>\n<td>$6,000\u2013$12,000<\/td>\n<td>10\u201318 weeks<\/td>\n<td>Custom engineering, fast response, FAT support<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Renowned global brands gain their price advantage due to years of successful projects and extensive network of servicing. Most mid-tier companies compete through engineering capabilities, reduced delivery times, and pricing while providing products according to IEC 60076 standard. Jiangsu Subian Electric Power is one of the Chinese companies manufacturing IEC 60076-compliant transformers up to 110 kV, offering FAT with clients\u2019 engineers, and exporting to Southeast Asia, Middle East, Africa, and Latin America. For EPCs who need to optimize their schedules, budgets, and compliance systems, Subian can provide audited IEC-certified production without waiting in a 20-32 week queue typical for famous brands.<\/p>\n<h2 id=\"hidden-costs\">Pricing Structure and Hidden-Cost Questions<\/h2>\n<p>When the price comparisons arise from different considerations, the valid comparison becomes invalid. One should ask the following questions before making the comparison:<\/p>\n<ul>\n<li>Is the tap changer, bushings, conservator, oil, and accessories included in the price? Differences of 5-15% in the accessories scope is the major reason behind the pricing differences of the quotes.<\/li>\n<li>Are type tests included or charged separately? The witnessing fee may involve $8,000-$30,000.<\/li>\n<li>What does the price include regarding packing and export crating? Tropical packing costs between 1-3% of the price.<\/li>\n<li>Is the price inclusive of installation supervision? Generally accepted price ranges between $150-$450 per engineer-day plus additional travel costs.<\/li>\n<li>What are the payment terms? The common structure is 30\/30\/30\/10 or 30\/40\/20\/10 and it is better not to pay more than 30-40% before FAT.<\/li>\n<\/ul>\n<p>To be sure that the comparison is valid, make sure that the prices are broken down by items and that the scope is the same; if the price is 25% less than the market price, something is missed.<\/p>\n<p>Summarize key points concerning the commercial terms before the signing takes place.<\/p>\n<table>\n<thead>\n<tr>\n<th>Term<\/th>\n<th>Common Practice<\/th>\n<th>EPC Protection<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Payment milestones<\/td>\n<td>30\/30\/30\/10<\/td>\n<td>Max 30\u201340% before FAT<\/td>\n<\/tr>\n<tr>\n<td>Warranty<\/td>\n<td>12\u201324 months<\/td>\n<td>Negotiate 24\u201360 months<\/td>\n<\/tr>\n<tr>\n<td>FAT witness<\/td>\n<td>First unit only<\/td>\n<td>100% for multi-unit orders<\/td>\n<\/tr>\n<tr>\n<td>Incoterms<\/td>\n<td>FOB or CIF<\/td>\n<td>Define freight risk clearly<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 id=\"aftersales\">After-Sales, Warranty, and Spare Parts Questions<\/h2>\n<p>A transformer has a long lifespan estimated to be around twenty to thirty years after purchase. Ask the vendor the following questions:<\/p>\n<ul>\n<li>What is your warranty, and what is excluded by it? Generally, it is given for a year or two after commissioning, and can be up to five years for core insulation defects.<\/li>\n<li>What is your procedure for warranty claims for transformers used overseas? Indicate the location of the repair, who is paying for delivery, and if compensation for downtime arises.<\/li>\n<li>Do you have service parts in stock (bushings, seals, OLTC elements, etc.)? Delivery of bushings can take 8 \u201316 weeks after the failure.<\/li>\n<li>Can you offer remote service for DGA and OLTC alarms? Negotiating for 24\/7 customer support is a sound investment.<\/li>\n<li>Do you provide maintenance contracts and\/or engineer training?<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10767\" src=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/How-to-Score-and-Shortlist-Suppliers.webp\" alt=\"How to Score and Shortlist Suppliers\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2 id=\"scoring\">How to Score and Shortlist Suppliers<\/h2>\n<p>Create a weighted scoring matrix based on the prior questions, enabling the decision to withstand internal scrutiny.Weighting that has been successful in the past is as follows:<\/p>\n<ul>\n<li>Technical compliance and testing capability \u2013 30 %: Compliance with standards, depth of test report, FAT policy<\/li>\n<li>Delivery reliability and capacity \u2013 20 %: Lead time, back orders, reference record<\/li>\n<li>Total cost of ownership \u2013 20 %: Price, share of losses incurred, transport, commissioning<\/li>\n<li>Quality system and audit outcomes \u2013 15 %: ISO 9001, factory audit, defects background<\/li>\n<li>After-sales service \u2013 10 %: Warranty, spare parts, response time<\/li>\n<li>Documentation and communication \u2013 5 %: Completion of drawings, command of technical terms in English<\/li>\n<\/ul>\n<p>Identify three potential suppliers and request bids for the same package from each of them, attend one FAT if the project value allows, and communicate with two reference customers who received shipments during the last 18 months. It will take some time but save EPCs months of delays and disputes worth six figures.<\/p>\n<h2 id=\"faq\">Perguntas Frequentes<\/h2>\n<h3>What is a realistic transformer lead time for an EPC project?<\/h3>\n<p>For regular transformers (about 2,500 kVA), the estimated delivery period is around 6 to 12 weeks for basic designs and 8 to 16 weeks for those accessories. For transformers of moderate size (5-40 MVA), the lead time is between 12 and 20 weeks whereas much larger transformers (60 MVA+) are sent in the span of 24 to 40 weeks. It is wise to include 2 to 6 weeks of delivery time in the final estimate as well.<\/p>\n<h3>Which standards should an EPC specify for transformer procurement?<\/h3>\n<p>Whenever ordering equipment, IEC 60076-1 through IEC 60076-19 should be specified every country over. In America, IEEE C57.12.90 and IEEE C57.12.00 standards are sufficient. You must evaluate the price quote in advance to be on the safer side.<\/p>\n<h3>How much should an EPC budget for a 10 MVA power transformer?<\/h3>\n<p>Expected costs for an average 10 mVA transformer are between $80,000- and $250,000 depending on brand as well as level of loss per unit. Spending 5 to 12 percent of the budget on customs is quite rational in this case, too. Make sure to get the most competitive prices available.<\/p>\n<h3>Is it worth paying more for a transformer with lower losses?<\/h3>\n<p>In most cases the answer would be yes. If the rate of losses in transformers is in the range of $2,000- to $6,000 per kW depending on the version of the transformer, the extra investment made might be covered fully in future savings.<\/p>\n<h3>Should EPCs witness factory acceptance tests for every transformer unit?<\/h3>\n<p>For mass production it would be wise to oversee the entire factory acceptance testing procedure with each unit sent.<\/p>\n<h2 id=\"references\">Refer\u00eancias<\/h2>\n<ul>\n<li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/628\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076-1: Power Transformers \u2014 General<\/a> \u2014 The primary international standard defining rating, voltage, and loss requirements for power transformers.<\/li>\n<li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/631\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076-5: Power Transformers \u2014 Ability to Withstand Short Circuit<\/a> \u2014 Specifies short-circuit withstand design verification and test procedures.<\/li>\n<li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/629\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076-11: Power Transformers \u2014 Dry-type Transformers<\/a> \u2014 The key standard for dry-type and cast-resin transformer procurement.<\/li>\n<li><a href=\"https:\/\/www.ieee.org\/content\/dam\/ieee-org\/ieee\/web\/org\/pes\/psim\/IEEE-C57.12.00-2021.pdf\" rel=\"nofollow noopener\" target=\"_blank\">IEEE C57.12.00: Standard for Liquid-Immersed Distribution, Power, and Regulating Transformers<\/a> \u2014 North American counterpart used for USA and Canadian projects.<\/li>\n<li><a href=\"https:\/\/www.iso.org\/standard\/62085.html\" rel=\"nofollow noopener\" target=\"_blank\">ISO 9001:2015 Quality Management Systems<\/a> \u2014 The baseline certification expected of any transformer manufacturing plant.<\/li>\n<li><a href=\"https:\/\/www.cigre.org\/\" rel=\"nofollow noopener\" target=\"_blank\">CIGR\u00c9<\/a> \u2014 International council publishing authoritative transformer reliability and maintenance research (A2 technical brochures).<\/li>\n<li><a href=\"https:\/\/subian-electric.com\/pt\/\">Jiangsu Subian Electric Power<\/a> \u2014 IEC 60076-compliant transformer manufacturer serving EPC and distribution projects worldwide.<\/li>\n<\/ul>\n<h2 id=\"conclusion\">Conclus\u00e3o<\/h2>\n<p>The choice of transformer vendor constitutes one of the most crucial steps in any EPC project. The inquiries mentioned previously embrace five main aspects that are vital for successful project delivery i.e. capacity and lead-time, testing and certification, engineering support, actual cost, and after-sales service. Make use of the questions laid above to devise a scoring matrix; compare the quotations against the price tables, and confirm the not-too-ambitious promises through factory inspections, examples of test reports, and reference phone calls.<\/p>\n<ul>\n<li>Make sure that compliance with the IEC 60076 or IEEE C57.12 is proved by type test reports.<\/li>\n<li>Check lead times ranging from 6-16 weeks (in case of distribution transformers) to 24-40 weeks (for big capacity electric machines) adding 15-20% of contingency.<\/li>\n<li>Adjust the prices based on the scope of supply and losses capitalization prior to price comparison.<\/li>\n<li>Make sure to be present at factory acceptance tests (FAT) to demand the relevant test report with each shipment.<\/li>\n<li>Plan for 12-60 warranty period and spare part availability in contracts and negotiations.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>An EPC company has clinched a contract for solar-plus-storage of 230 MW in the Philippines. The clients are demanding that transformers be delivered at the site in 26 weeks. The procurement manager has three shortlisted suppliers, two quotations whose prices vary by almost 40 percent, and a project timetable that cannot be breached. If you [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":10765,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[77],"tags":[],"class_list":["post-10764","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/subian-electric.com\/pt\/wp-json\/wp\/v2\/posts\/10764","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/subian-electric.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/subian-electric.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/pt\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/pt\/wp-json\/wp\/v2\/comments?post=10764"}],"version-history":[{"count":2,"href":"https:\/\/subian-electric.com\/pt\/wp-json\/wp\/v2\/posts\/10764\/revisions"}],"predecessor-version":[{"id":10986,"href":"https:\/\/subian-electric.com\/pt\/wp-json\/wp\/v2\/posts\/10764\/revisions\/10986"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/pt\/wp-json\/wp\/v2\/media\/10765"}],"wp:attachment":[{"href":"https:\/\/subian-electric.com\/pt\/wp-json\/wp\/v2\/media?parent=10764"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/subian-electric.com\/pt\/wp-json\/wp\/v2\/categories?post=10764"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/subian-electric.com\/pt\/wp-json\/wp\/v2\/tags?post=10764"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}