{"id":2231,"date":"2025-10-31T09:43:00","date_gmt":"2025-10-31T01:43:00","guid":{"rendered":"https:\/\/www.britecelectric.com\/?post_type=blog&p=2231"},"modified":"2025-11-03T16:21:24","modified_gmt":"2025-11-03T08:21:24","slug":"types-of-industrial-surge-protection-devices-and-graded-protection-strategies","status":"publish","type":"blog","link":"https:\/\/www.britecelectric.com\/pt\/blog\/types-of-industrial-surge-protection-devices-and-graded-protection-strategies\/","title":{"rendered":"Tipos de dispositivos de prote\u00e7\u00e3o contra surtos industriais e estrat\u00e9gias de prote\u00e7\u00e3o graduadas"},"content":{"rendered":"
Este artigo apresentar\u00e1 sistematicamente os tipos, m\u00e9todos de classifica\u00e7\u00e3o e como construir um sistema eficaz de prote\u00e7\u00e3o graduada para protetores contra surtos industriais (SPD)<\/strong><\/a>.<\/div>\r\n \r\n

Classifica\u00e7\u00e3o por princ\u00edpio t\u00e9cnico e capacidade de descarga<\/h2>\r\n
Este \u00e9 o principal m\u00e9todo de classifica\u00e7\u00e3o para SPD, que determina diretamente seus cen\u00e1rios de aplica\u00e7\u00e3o e n\u00edveis de prote\u00e7\u00e3o, e geralmente \u00e9 baseado em padr\u00f5es internacionais como IEC 61643.<\/div>\r\n\"Dispositivo<\/a>\r\n

Tipo 1 (Tipo 1\/T1): Descarga de Energia<\/h3>\r\n
Princ\u00edpio T\u00e9cnico: <\/strong>Dispositivos de prote\u00e7\u00e3o contra surtos tipo 1<\/a> normalmente usa um centelhador como seu componente principal. Sua principal caracter\u00edstica \u00e9 a alta capacidade de descarga de corrente de surto.<\/div>\r\n
Capacidade de descarga: <\/strong>Capaz de suportar e liberar descargas atmosf\u00e9ricas diretas ou parciais (simulando uma forma de onda 10\/350\u00b5s); as correntes de teste normalmente podem atingir dezenas de quiloamperes.<\/div>\r\n
Cen\u00e1rios de aplica\u00e7\u00e3o: <\/strong>Primarily installed at the entrance of the building's main distribution cabinet (MDB) as a primary protection device to release lightning current from external lines (e.g., power lines).<\/div>\r\n \r\n\r\n\"Dispositivo<\/a>\r\n

Tipo 2 (Tipo 2\/T2): Limitador de Tens\u00e3o<\/h3>\r\n
Princ\u00edpio T\u00e9cnico: O componente principal \u00e9 um varistor (MOV). Sob tens\u00e3o normal, o MOV apresenta alta resist\u00eancia; quando ocorre uma sobretens\u00e3o de surto, sua resist\u00eancia cai drasticamente, desviando a corrente e fixando a tens\u00e3o a um n\u00edvel seguro.<\/div>\r\n
Capacidade de descarga: Dispositivos de prote\u00e7\u00e3o contra surtos tipo 2<\/a> Usado para descarregar descargas atmosf\u00e9ricas induzidas e sobretens\u00f5es operacionais (simulando forma de onda de 8\/20 \u00b5s), com capacidade de descarga variando normalmente de v\u00e1rios milhares a dezenas de milhares de amperes.<\/div>\r\n
Cen\u00e1rios de aplica\u00e7\u00e3o: Instalado a jusante do gabinete de distribui\u00e7\u00e3o principal no gabinete de distribui\u00e7\u00e3o (painel de distribui\u00e7\u00e3o, SDB) ou antes do gabinete de controle de equipamentos importantes, servindo como prote\u00e7\u00e3o secund\u00e1ria para fornecer prote\u00e7\u00e3o para a maioria dos equipamentos el\u00e9tricos.<\/div>\r\n\"Protetor<\/a>\r\n

Tipo 3 (Tipo 3\/T3): Prote\u00e7\u00e3o Avan\u00e7ada<\/h3>\r\n
Princ\u00edpio T\u00e9cnico: Normalmente emprega MOVs mais finos, tubos de descarga de g\u00e1s ou diodos TVS, resultando em resposta extremamente r\u00e1pida e menor tens\u00e3o residual (n\u00edvel de prote\u00e7\u00e3o).<\/div>\r\n
Capacidade de descarga: A capacidade de descarga \u00e9 relativamente pequena, usada principalmente para suprimir ainda mais a tens\u00e3o residual.<\/div>\r\n
Cen\u00e1rios de aplica\u00e7\u00e3o: Dispositivos de prote\u00e7\u00e3o contra surtos tipo 3<\/a> installed very close to the protected equipment, such as in the equipment's socket or socket board, for fine protection. It usually needs to be used in conjunction with a Type 2 SPD and cannot be installed alone.<\/div>\r\n \r\n\r\n\"BR-12.5M<\/a>\r\n

Spd Combinado (Tipo 1+2): Solu\u00e7\u00e3o Integrada<\/h3>\r\n
Princ\u00edpio T\u00e9cnico: Este dispositivo integra um centelhador Tipo 1 e um varistor Tipo 2, oferecendo as vantagens de alta capacidade de descarga e baixo n\u00edvel de prote\u00e7\u00e3o.<\/div>\r\n
Cen\u00e1rios de aplica\u00e7\u00e3o: Dispositivos combinados de prote\u00e7\u00e3o contra surtos SPD (Tipo 1+2)<\/a> adequado para aplica\u00e7\u00f5es com espa\u00e7o limitado ou que requerem design simplificado. Pode ser instalado diretamente no arm\u00e1rio de distribui\u00e7\u00e3o principal na entrada do edif\u00edcio, proporcionando prote\u00e7\u00e3o combinada de primeiro e segundo n\u00edvel.<\/div>\r\n \r\n

Classifica\u00e7\u00e3o estendida de dispositivos de prote\u00e7\u00e3o contra surtos industriais<\/h2>\r\n
Al\u00e9m dos principais tipos de tecnologia, os SPD industriais tamb\u00e9m podem ser classificados de acordo com outras dimens\u00f5es.<\/div>\r\n

Classifica\u00e7\u00e3o por tipo de fonte de alimenta\u00e7\u00e3o<\/h3>\r\n
SPD de fonte de alimenta\u00e7\u00e3o CA: Usado para proteger sistemas de fonte de alimenta\u00e7\u00e3o CA, como redes de energia industriais de 380V\/220V.<\/div>\r\n
SPD de fonte de alimenta\u00e7\u00e3o CC: Usado para proteger sistemas de fonte de alimenta\u00e7\u00e3o CC, como sistemas de gera\u00e7\u00e3o de energia fotovoltaica, acionamentos de motor CC e fontes de alimenta\u00e7\u00e3o de esta\u00e7\u00e3o base de comunica\u00e7\u00e3o.<\/div>\r\n \r\n

SPD de alimenta\u00e7\u00e3o CA versus SPD de alimenta\u00e7\u00e3o CC<\/h4>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Recurso<\/th>\r\nSPD de alimenta\u00e7\u00e3o CA<\/th>\r\nSPD de alimenta\u00e7\u00e3o CC<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
Aplica\u00e7\u00e3o Prim\u00e1ria<\/strong><\/td>\r\nPain\u00e9is el\u00e9tricos principais, subpain\u00e9is, circuitos ramais em resid\u00eancias, escrit\u00f3rios e instala\u00e7\u00f5es industriais.<\/td>\r\nMatrizes solares fotovoltaicas, sistemas de armazenamento de baterias, esta\u00e7\u00f5es de carregamento de ve\u00edculos el\u00e9tricos, telecomunica\u00e7\u00f5es, automotivo, mar\u00edtimo e transporte p\u00fablico.<\/td>\r\n<\/tr>\r\n
Tens\u00e3o do sistema<\/strong><\/td>\r\nSegue tens\u00f5es CA padr\u00e3o (por exemplo, 120 V, 230 V, 400 V, 480 V).<\/td>\r\nAltamente vari\u00e1vel (por exemplo, 12V, 24V, 48V para baterias; 600V a 1500V para cadeias solares).<\/td>\r\n<\/tr>\r\n
Comportamento Atual<\/strong><\/td>\r\nCorrente alternada.<\/strong>\u00a0A tens\u00e3o cruza zero 100 ou 120 vezes por segundo. Isso ajuda\u00a0extinguir um arco el\u00e9trico<\/strong>.<\/td>\r\nCorrente cont\u00ednua.<\/strong>\u00a0A tens\u00e3o \u00e9 constante e n\u00e3o ultrapassa zero. Isso faz\u00a0arco muito mais sustentado e perigoso<\/strong>.<\/td>\r\n<\/tr>\r\n
Desafio principal de design<\/strong><\/td>\r\nGerenciamento de sobretens\u00f5es transit\u00f3rias. O cruzamento zero da CA naturalmente ajuda a interromper a corrente seguinte.<\/td>\r\nSupress\u00e3o de arco.<\/strong>\u00a0The primary challenge is to safely quench the \"follow current\" from the DC source after a surge event without the SPD catching fire.<\/td>\r\n<\/tr>\r\n
Tecnologia e componentes internos<\/strong><\/td>\r\nUsa principalmente\u00a0Varistores de \u00f3xido met\u00e1lico (MOVs)<\/strong>\u00a0e \u00e0s vezes tubos de descarga de g\u00e1s (GDTs). Os designs s\u00e3o relativamente simples.<\/td>\r\nUsa mais robusto\u00a0MOVs<\/strong>\u00a0com c\u00e2maras\/enchimentos especiais para extin\u00e7\u00e3o de arco. Maior depend\u00eancia de\u00a0GDTs<\/strong>\u00a0projetado especificamente para DC, que pode lidar com seguran\u00e7a com a tens\u00e3o DC cont\u00ednua sem vazamentos.<\/td>\r\n<\/tr>\r\n
Classifica\u00e7\u00e3o de tens\u00e3o (Uc)<\/strong><\/td>\r\nClassificado para opera\u00e7\u00e3o cont\u00ednua em tens\u00f5es CA RMS padr\u00e3o (por exemplo, 275 V, 320 V, 440 V).<\/td>\r\nClassificado para opera\u00e7\u00e3o cont\u00ednua na tens\u00e3o espec\u00edfica do sistema CC (por exemplo, 1000 V CC, 1500 V CC).<\/td>\r\n<\/tr>\r\n
Desconex\u00e3o e Seguran\u00e7a<\/strong><\/td>\r\nFreq\u00fcentemente inclui seccionadores t\u00e9rmicos para falhar com seguran\u00e7a em um MOV que foi degradado por muitos surtos.<\/td>\r\nCr\u00edtico e mais robusto.<\/strong>\u00a0Requer mecanismos avan\u00e7ados de falha para desconectar fisicamente o SPD da fonte CC de maneira \u00e0 prova de falhas, pois um arco CC sustentado \u00e9 um grande risco de inc\u00eandio.<\/td>\r\n<\/tr>\r\n
Padr\u00f5es de Certifica\u00e7\u00e3o<\/strong><\/td>\r\nUL 1449 (Am\u00e9rica do Norte), IEC 61643-11 (Internacional).<\/td>\r\nUL 1449 (para aplica\u00e7\u00f5es CC espec\u00edficas), IEC 61643-11, UL 497B e padr\u00f5es espec\u00edficos para sistemas fotovoltaicos como IEC 62548.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n \r\n

Classifica\u00e7\u00e3o por tipo de sinal<\/h3>\r\n
Os ambientes industriais cont\u00eam n\u00e3o apenas linhas de energia, mas tamb\u00e9m numerosas linhas de sinal e controle. Os SPDs de sinal s\u00e3o projetados especificamente para proteger essas linhas de baixa tens\u00e3o, como:<\/div>\r\n
\u25cf SPD de rede\/Ethernet<\/div>\r\n
\u25cf Porta serial RS-232\/485\/422 SPD<\/div>\r\n
\u25cf SPD de E\/S Anal\u00f3gica\/Digital<\/div>\r\n
\u25cf Cabo coaxial SPD (usado para vigil\u00e2ncia por v\u00eddeo, antenas, etc.)<\/div>\r\n \r\n

Classifica\u00e7\u00e3o por estrutura de montagem<\/h3>\r\n

Dispositivos de prote\u00e7\u00e3o contra surtos plug-in<\/h4>\r\n
Parece um adaptador e se conecta diretamente a uma tomada de parede. \u00c9 usado principalmente para proteger um \u00fanico dispositivo e pertence ao Tipo 3.<\/div>\r\n \r\n

Dispositivos modulares de prote\u00e7\u00e3o contra surtos<\/h4>\r\n
O design modular padr\u00e3o permite que ele seja montado em trilho DIN em um gabinete de distribui\u00e7\u00e3o, como um disjuntor. Esta \u00e9 a forma mais comum em aplica\u00e7\u00f5es industriais, facilitando a instala\u00e7\u00e3o, substitui\u00e7\u00e3o e monitoramento de condi\u00e7\u00f5es (atrav\u00e9s de contatos de sinaliza\u00e7\u00e3o remota). O Tipo 1 e o Tipo 2 s\u00e3o principalmente deste tipo.<\/div>\r\n \r\n

Dispositivos de prote\u00e7\u00e3o contra surtos tipo caixa<\/h4>\r\n
M\u00f3dulos SPD, fus\u00edveis ou disjuntores s\u00e3o integrados em um \u00fanico inv\u00f3lucro de prote\u00e7\u00e3o, que \u00e9 comumente usado em caixas de equipamentos externos ou de campo.<\/div>\r\n \r\n

Como construir um sistema de prote\u00e7\u00e3o em n\u00edveis (escalonados)?<\/h2>\r\n
Um \u00fanico SPD n\u00e3o pode fornecer prote\u00e7\u00e3o perfeita, portanto \u00e9 necess\u00e1ria uma estrat\u00e9gia de prote\u00e7\u00e3o em n\u00edveis (ou escalonados).<\/div>\r\n

Princ\u00edpio da prote\u00e7\u00e3o em camadas<\/h4>\r\n
The core concept of graded protection is \"step-by-step discharge and layer-by-layer clamping.\"<\/div>\r\n
N\u00edvel 1 (Tipo 1\/Tipo 1+2): Na linha de entrada principal, absorve e descarrega a grande maioria da energia de surto massivo, limitando sobretens\u00f5es de v\u00e1rios quilovolts a um n\u00edvel mais baixo (por exemplo, 1500-2500V).<\/div>\r\n
N\u00edvel 2 (Tipo 2): No painel de distribui\u00e7\u00e3o, descarrega ainda mais os surtos residuais que penetraram no N\u00edvel 1 e fixa a tens\u00e3o a um n\u00edvel mais seguro (por exemplo, 1000-1500V).<\/div>\r\n
N\u00edvel 3 (Tipo 3): Na parte frontal do equipamento, proporciona supress\u00e3o final de pequenos surtos residuais, oferecendo a menor tens\u00e3o residual poss\u00edvel (normalmente abaixo de 1000V), garantindo a seguran\u00e7a absoluta das portas dos equipamentos de precis\u00e3o.<\/div>\r\n
Uma certa dist\u00e2ncia de linha (geralmente recomendada como superior a 10 metros) precisa ser mantida entre cada n\u00edvel de SPD para utilizar a imped\u00e2ncia de linha para coordena\u00e7\u00e3o de energia. Se a dist\u00e2ncia for insuficiente, componentes de desacoplamento (como indutores de desacoplamento dedicados ou fus\u00edveis\/disjuntores apropriados) ser\u00e3o necess\u00e1rios para garantir que cada n\u00edvel do SPD opere em uma sequ\u00eancia coordenada.<\/div>\r\n \r\n

Exemplo de configura\u00e7\u00e3o Spd em cen\u00e1rios industriais t\u00edpicos<\/h4>\r\n
Cen\u00e1rio: Centro de Controle de Linha de Produ\u00e7\u00e3o Automatizada<\/div>\r\n
Sala de Distribui\u00e7\u00e3o Principal (MDB): Instalar DPS Tipo 1+2 para proteger a entrada de energia de todo o edif\u00edcio.<\/div>\r\n
Gabinete de controle de linha de produ\u00e7\u00e3o (SDB): Instale SPDs Tipo 2 para proteger a fonte de alimenta\u00e7\u00e3o das unidades de controle principais, como CLPs e conversores de frequ\u00eancia.<\/div>\r\n
Frente do m\u00f3dulo de E\/S do PLC: Instale SPDs de sinal nas linhas de sinal de controle (por exemplo, 24 Vcc).<\/div>\r\n
Esta\u00e7\u00e3o de trabalho do engenheiro: Use placas de soquete SPD Tipo 3 nos soquetes para proteger o computador e o programador.<\/div>\r\n
Switch de rede de oficina: Instale SPDs Ethernet nas portas de rede.<\/div>\r\n \r\n

Perguntas frequentes<\/h2>\r\n
Como selecionar o tipo de SPD apropriado com base nas condi\u00e7\u00f5es do local?<\/strong><\/div>\r\n
Etapa 1: Determine o local de instala\u00e7\u00e3o. Selecione T1 ou T1+2 para o gabinete da linha de entrada principal; T2 para arm\u00e1rio de distribui\u00e7\u00e3o; e T3 para a parte frontal do equipamento.<\/div>\r\n
Etapa 2: verifique os principais par\u00e2metros. A tens\u00e3o m\u00e1xima de opera\u00e7\u00e3o cont\u00ednua (Uc) deve ser maior que a tens\u00e3o mais alta que pode ocorrer na rede el\u00e9trica local; a corrente de descarga nominal (In) e a corrente m\u00e1xima de descarga (Imax) devem atender aos requisitos do n\u00edvel de prote\u00e7\u00e3o contra raios (LPL) do ponto de instala\u00e7\u00e3o; o n\u00edvel de prote\u00e7\u00e3o de tens\u00e3o (Up) deve ser inferior ao valor da tens\u00e3o suport\u00e1vel do equipamento protegido.<\/div>\r\n
Etapa 3: Considere outros fatores, como o sistema de fonte de alimenta\u00e7\u00e3o (CA\/CC), m\u00e9todo de instala\u00e7\u00e3o (modular\/tipo caixa), indica\u00e7\u00e3o de status e requisitos de fun\u00e7\u00e3o de sinaliza\u00e7\u00e3o remota.<\/div>\r\n \r\n
Inspe\u00e7\u00e3o di\u00e1ria e manuten\u00e7\u00e3o de SPD industrial<\/strong><\/div>\r\n
Inspe\u00e7\u00e3o visual regular: Verifique se h\u00e1 danos f\u00edsicos no SPD, como rachaduras ou marcas de queimadura.<\/div>\r\n
Observe o indicador de status: A maioria dos SPDs possui um indicador de janela codificado por cores (verde\/vermelho). Verde indica opera\u00e7\u00e3o normal e vermelho indica falha, exigindo substitui\u00e7\u00e3o imediata.<\/div>\r\n
Mantenha um registro de manuten\u00e7\u00e3o: registre a data de instala\u00e7\u00e3o, a data da inspe\u00e7\u00e3o inicial e os detalhes da inspe\u00e7\u00e3o subsequente. Mesmo quando em condi\u00e7\u00f5es normais, os SPDs t\u00eam uma vida \u00fatil limitada; recomenda-se inspecion\u00e1-los ou substitu\u00ed-los periodicamente (por exemplo, a cada 3-5 anos) ou ap\u00f3s um grande evento de sobretens\u00e3o.<\/div>\r\n
Testes profissionais: Utilize instrumentos especializados para medir a corrente de fuga do varistor e avaliar a degrada\u00e7\u00e3o do desempenho.<\/div>\r\n \r\n
Os dispositivos de prote\u00e7\u00e3o contra surtos podem impedir o disparo dos disjuntores?<\/strong><\/div>\r\n
A principal fun\u00e7\u00e3o de um SPD \u00e9 evitar que o equipamento seja danificado por sobretens\u00e3o, e n\u00e3o impedir o disparo dos disjuntores.<\/div>\r\n \r\n

Conclus\u00e3o<\/h2>\r\n
Compreendendo os princ\u00edpios t\u00e9cnicos e cen\u00e1rios de aplica\u00e7\u00e3o de diferentes tipos de dispositivos industriais de prote\u00e7\u00e3o contra surtos (SPD) (t1, t2, t3) e combinando-os com prote\u00e7\u00e3o abrangente de linhas de energia e sinal, podemos construir um sistema de prote\u00e7\u00e3o hier\u00e1rquico (passo a passo) eficaz.<\/div>","protected":false},"featured_media":1601,"parent":0,"menu_order":107,"template":"","meta":{"_acf_changed":false},"blog_category":[9],"class_list":["post-2231","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-industry-news"],"acf":{"des":"This article provides a detailed analysis of the Type 1\/2\/3 industrial surge protection devices (SPD) and their technical principles, explains how to construct an effective hierarchical (step-by-step) protection strategy to ensure the safety of industrial equipment, and answers common selection and maintenance questions.","txt":"
This article will systematically introduce the types, classification methods, and how to build an effective graded protection system for industrial surge protectors (SPD)<\/strong><\/a>.<\/div>\r\n \r\n

Classification By Technical Principle And Discharge Capacity<\/h2>\r\n
This is the core classification method for SPD, which directly determines their application scenarios and protection levels, and is usually based on international standards such as IEC 61643.<\/div>\r\n\"BR-25M<\/a>\r\n

Type 1 (Type 1\/T1): Energy Discharge<\/h3>\r\n
Technical Principle: <\/strong>Type 1 surge protection devices<\/a> typically uses a spark gap as its core component. Its main characteristic is its high surge current discharge capability.<\/div>\r\n
Discharge Capability: <\/strong>Capable of withstanding and releasing direct lightning strikes or partial lightning current (simulating a 10\/350\u00b5s waveform); test currents can typically reach tens of kiloamperes.<\/div>\r\n
Application Scenarios: <\/strong>Primarily installed at the entrance of the building's main distribution cabinet (MDB) as a primary protection device to release lightning current from external lines (e.g., power lines).<\/div>\r\n \r\n\r\n\"BR-20<\/a>\r\n

Type 2 (Type 2\/T2): Voltage Limiter<\/h3>\r\n
Technical Principle: The core component is a varistor (MOV). Under normal voltage, the MOV exhibits high resistance; when a surge overvoltage occurs, its resistance drops sharply, bypassing the current and clamping the voltage to a safe level.<\/div>\r\n
Discharge Capacity: Type 2 surge protection devices<\/a> Used to discharge induced lightning strikes and operational overvoltages (simulating 8\/20\u00b5s waveform), with a discharge capacity typically ranging from several thousand to tens of thousands of amperes.<\/div>\r\n
Application Scenarios: Installed downstream of the main distribution cabinet in the distribution cabinet (distribution panel, SDB) or before the control cabinet of important equipment, serving as secondary protection to provide protection for most electrical equipment.<\/div>\r\n\"BR-230<\/a>\r\n

Type 3 (Type 3\/T3): Advanced Protection<\/h3>\r\n
Technical Principle: Typically employs finer MOVs, gas discharge tubes, or TVS diodes, resulting in extremely fast response and lower residual voltage (protection level).<\/div>\r\n
Discharge Capacity: The discharge capacity is relatively small, primarily used to further suppress residual surge voltage.<\/div>\r\n
Application Scenarios: Type 3 surge protection devices<\/a> installed very close to the protected equipment, such as in the equipment's socket or socket board, for fine protection. It usually needs to be used in conjunction with a Type 2 SPD and cannot be installed alone.<\/div>\r\n \r\n\r\n\"BR-12.5M<\/a>\r\n

Combined Spd (Type 1+2): Integrated Solution<\/h3>\r\n
Technical Principle: This device integrates a Type 1 spark gap and a Type 2 varistor, offering the advantages of high discharge capability and low protection level.<\/div>\r\n
Application Scenarios: Combined SPD (Type 1+2) surge protection devices<\/a> suitable for applications with limited space or requiring simplified design. It can be directly installed in the main distribution cabinet at the building entrance, providing combined first- and second-level protection.<\/div>\r\n \r\n

Extended Classification Of Industrial Surge Protection Devices<\/h2>\r\n
In addition to core technology types, industrial SPDs can also be classified according to other dimensions.<\/div>\r\n

Classification By Power Source Type<\/h3>\r\n
AC power supply SPD: Used to protect AC power supply systems, such as 380V\/220V industrial power grids.<\/div>\r\n
DC power supply SPD: Used to protect DC power supply systems, such as photovoltaic power generation systems, DC motor drives, and communication base station power supplies.<\/div>\r\n \r\n

AC Power SPD VS Dc Power SPD<\/h4>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Feature<\/th>\r\nAC Power SPD<\/th>\r\nDC Power SPD<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
Primary Application<\/strong><\/td>\r\nMain electrical panels, sub-panels, branch circuits in homes, offices, and industrial facilities.<\/td>\r\nSolar PV arrays, battery storage systems, EV charging stations, telecommunications, automotive, marine, and public transport.<\/td>\r\n<\/tr>\r\n
System Voltage<\/strong><\/td>\r\nFollows standard AC voltages (e.g., 120V, 230V, 400V, 480V).<\/td>\r\nHighly variable (e.g., 12V, 24V, 48V for batteries; 600V to 1500V for solar strings).<\/td>\r\n<\/tr>\r\n
Current Behavior<\/strong><\/td>\r\nAlternating Current.<\/strong>\u00a0The voltage crosses zero 100 or 120 times per second. This helps\u00a0extinguish an electrical arc<\/strong>.<\/td>\r\nDirect Current.<\/strong>\u00a0The voltage is constant and does not cross zero. This makes\u00a0arcing much more sustained and dangerous<\/strong>.<\/td>\r\n<\/tr>\r\n
Key Design Challenge<\/strong><\/td>\r\nManaging transient overvoltages. The zero-crossing of AC naturally helps interrupt follow current.<\/td>\r\nArc Suppression.<\/strong>\u00a0The primary challenge is to safely quench the \"follow current\" from the DC source after a surge event without the SPD catching fire.<\/td>\r\n<\/tr>\r\n
Internal Technology & Components<\/strong><\/td>\r\nPrimarily uses\u00a0Metal Oxide Varistors (MOVs)<\/strong>\u00a0and sometimes Gas Discharge Tubes (GDTs). Designs are relatively straightforward.<\/td>\r\nUses more robust\u00a0MOVs<\/strong>\u00a0with special arc-quenching chambers\/fillers. Heavier reliance on\u00a0GDTs<\/strong>\u00a0specifically designed for DC, which can safely handle the continuous DC voltage without leaking.<\/td>\r\n<\/tr>\r\n
Voltage Rating (Uc)<\/strong><\/td>\r\nRated for continuous operation at standard AC RMS voltages (e.g., 275V, 320V, 440V).<\/td>\r\nRated for continuous operation at the specific DC system voltage (e.g., 1000V DC, 1500V DC).<\/td>\r\n<\/tr>\r\n
Disconnection & Safety<\/strong><\/td>\r\nOften includes thermal disconnectors to safely fail an MOV that has been degraded by many surges.<\/td>\r\nCritical and more robust.<\/strong>\u00a0Requires advanced failure mechanisms to physically disconnect the SPD from the DC source in a fail-safe manner, as a sustained DC arc is a major fire hazard.<\/td>\r\n<\/tr>\r\n
Certification Standards<\/strong><\/td>\r\nUL 1449 (North America), IEC 61643-11 (International).<\/td>\r\nUL 1449 (for specific DC applications), IEC 61643-11, UL 497B, and specific standards for PV systems like IEC 62548.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n \r\n

Classification By Signal Type<\/h3>\r\n
Industrial environments contain not only power lines but also numerous signal and control lines. Signal SPDs are specifically designed to protect these low-voltage lines, such as:<\/div>\r\n
\u25cf Network\/Ethernet SPD<\/div>\r\n
\u25cf RS-232\/485\/422 Serial Port SPD<\/div>\r\n
\u25cf Analog\/Digital I\/O SPD<\/div>\r\n
\u25cf Coaxial Cable SPD (used for video surveillance, antennas, etc.)<\/div>\r\n \r\n

Classification By Mounting Structure<\/h3>\r\n

Plug-In Surge Protective Devices<\/h4>\r\n
It looks like an adapter and plugs directly into a wall socket. It is mainly used to protect a single device and belongs to Type 3.<\/div>\r\n \r\n

Modular Surge Protective Devices<\/h4>\r\n
The standard modular design allows it to be mounted on a DIN rail in a distribution cabinet, just like a circuit breaker. This is the most common form in industrial applications, facilitating installation, replacement, and condition monitoring (via remote signaling contacts). Type 1 and Type 2 are mostly of this type.<\/div>\r\n \r\n

Box-Type Surge Protective Devices<\/h4>\r\n
SPD modules, fuses, or circuit breakers are integrated into a single protective enclosure, which is commonly used in outdoor or field equipment boxes.<\/div>\r\n \r\n

How To Build A Tiered (Stepped) Protection System?<\/h2>\r\n
A single SPD cannot provide perfect protection, so a tiered (or stepped) protection strategy is required.<\/div>\r\n

Principle Of Tiered Protection<\/h4>\r\n
The core concept of graded protection is \"step-by-step discharge and layer-by-layer clamping.\"<\/div>\r\n
Level 1 (Type 1\/Type 1+2): At the main incoming line, it absorbs and discharges the vast majority of the massive surge energy, limiting overvoltages of several kilovolts to a lower level (e.g., 1500-2500V).<\/div>\r\n
Level 2 (Type 2): At the distribution panel, it further discharges residual surges that have penetrated Level 1 and clamps the voltage to a safer level (e.g., 1000-1500V).<\/div>\r\n
Level 3 (Type 3): At the front end of the equipment, it provides final suppression of minor residual surges, offering the lowest possible residual voltage (typically below 1000V), ensuring the absolute safety of precision equipment ports.<\/div>\r\n
A certain line distance (generally recommended to be more than 10 meters) needs to be maintained between each level of SPD to utilize line impedance for energy coordination. If the distance is insufficient, decoupling components (such as dedicated decoupling inductors or appropriate fuses\/circuit breakers) are required to ensure that each level of SPD operates in a coordinated sequence.<\/div>\r\n \r\n

Example Of Spd Configuration In Typical Industrial Scenarios<\/h4>\r\n
Scenario: Automated Production Line Control Center<\/div>\r\n
Main Distribution Room (MDB): Install Type 1+2 SPDs to protect the power input to the entire building.<\/div>\r\n
Production Line Control Cabinet (SDB): Install Type 2 SPDs to protect the power supply to core control units such as PLCs and frequency converters.<\/div>\r\n
PLC I\/O Module Front: Install signal SPDs on control signal lines (e.g., 24V DC).<\/div>\r\n
Engineer Workstation: Use Type 3 SPD socket boards on the sockets to protect the computer and programmer.<\/div>\r\n
Workshop Network Switch: Install Ethernet SPDs on the network ports.<\/div>\r\n \r\n

FAQ<\/h2>\r\n
How To Select The Appropriate SPD Type Based On Site Conditions?<\/strong><\/div>\r\n
Step 1: Determine the installation location. Select T1 or T1+2 for the main incoming line cabinet; T2 for the distribution cabinet; and T3 for the equipment front end.<\/div>\r\n
Step 2: Check key parameters. The maximum continuous operating voltage (Uc) must be greater than the highest voltage that may occur in the local power grid; the nominal discharge current (In) and maximum discharge current (Imax) must meet the lightning protection level (LPL) requirements of the installation point; the voltage protection level (Up) should be lower than the withstand voltage value of the protected equipment.<\/div>\r\n
Step 3: Consider other factors, such as the power supply system (AC\/DC), installation method (modular\/box-type), status indication, and remote signaling function requirements.<\/div>\r\n \r\n
Daily Inspection And Maintenance Of Industrial SPD<\/strong><\/div>\r\n
Regular visual inspection: Check the SPD for physical damage, such as cracks or burn marks.<\/div>\r\n
Observe the status indicator: Most SPDs have a color-coded window (green\/red) indicator. Green indicates normal operation, and red indicates failure, requiring immediate replacement.<\/div>\r\n
Keep a maintenance log: Record the installation date, initial inspection date, and subsequent inspection details. Even when in normal condition, SPDs have a limited lifespan; it is recommended to inspect or replace them periodically (e.g., every 3-5 years) or after a major surge event.<\/div>\r\n
Professional testing: Use specialized instruments to measure the leakage current of the varistor and assess for performance degradation.<\/div>\r\n \r\n
Can Surge Protection Devices Prevent Circuit Breakers From Tripping?<\/strong><\/div>\r\n
The primary function of an SPD is to prevent equipment from being damaged by overvoltage, not to prevent circuit breakers from tripping.<\/div>\r\n \r\n

Conclusion<\/h2>\r\n
Understanding the technical principles and application scenarios of different types of industrial surge protection devices (SPD) (t1, t2, t3), and combining them with comprehensive protection of power and signal lines, we can build an effective hierarchical (step-by-step) protection system.<\/div>"},"_links":{"self":[{"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/blog\/2231","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/media\/1601"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/media?parent=2231"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/blog_category?post=2231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}