Um guia completo para a seleção e parâmetros técnicos de transformadores do tipo seco: 10 pontos-chave que os engenheiros e as áreas de compras provavelmente ignorarão

Em projetos práticos, the problem of selecting the wrong model for transformadores do tipo seco is very common.

A capacidade é suficiente, mas o aumento da temperatura excede o padrão;
Correspondência de tensão, but noise is not qualified;
Parameter compliance, but overseas acceptance failed.

This article will delve into the most critical but easily overlooked technical details of dry-type transformers from the perspective of engineering selection.

1.Seleção de capacidade: You cannot just look at kVA

1.1 Continuous load and intermittent load

Dry-type transformers are highly sensitive to ambient temperature and require appropriate derating in the following scenarios:

• high altitude
• high temperature environment
• Closed computer room

1.2 Overload Capacity Assessment

The short-term overload capacity of epoxy cast transformadores do tipo seco is significantly weaker than that of oil immersed transformers, and the load curve needs to be evaluated in advance.

2.Voltage level and wiring group

Common combinations:

• 10kV / 0.4kV
• 20kV / 0.4kV

The wiring group should match the system protection logic, como:

• Dyn11
• Sim0

3.Insulation level and temperature rise design

When choosing, consider long-term operating temperature rather than short-term limits.

4.Selection of cooling method

UM: Resfriamento natural, baixo ruído
DE: Forced air cooling, capacity can be increased by 30-40%

But the reliability and maintenance of the fan also need to be taken into consideration.

5.Nível de descarga parcial

High quality dry-type transformers typically require:

• Partial discharge ≤ 10 computador

This is one of the core indicators for overseas project acceptance.

6.Noise control

Noise often becomes a veto in data center and commercial building projects.
Attention should be paid to:

• core structure
• Shock absorption design
• Installation foundation

7.Protection level and environmental adaptability

Common levels:

• IP00 (indoor)
• IP23/IP31 (anti drip, anti foreign object)

8.Energy efficiency and loss indicators

Critical loss parameters:

• perda sem carga
• perda de carga

The EU and North American markets have particularly strict requirements for this.

9.Padrões, certificações, and documents

Common requirements:

• CEI / IEEE
• CE
• ISO system documents

10Hidden risks of export projects

Wooden crate packaging standard
Shipping moisture prevention
Technical document language

Dry-type transformers are not necessarily “the better the parameter table, the safer it is”, but rather highly coupled system equipment with application scenarios.
The truly professional selection is a comprehensive reflection of technical understanding, engineering experience, and standard awareness.

Luoyang Datang Tecnologia de Energia Co., Ltda. é uma empresa de alta tecnologia que integra R&D, fabricação e fornecimento de equipamentos de energia, como transformadores, novos componentes de energia, armários de distribuição e inversores. Com a inovação tecnológica como núcleo, nos concentramos na criação de soluções de energia de alta confiabilidade e alto desempenho para atender clientes globais. Com um rigoroso sistema de controle de qualidade e certificação de padrão internacional, continuamos a produzir produtos excelentes e a permitir que os clientes construam sistemas de energia seguros e estáveis.