Un guide complet sur la sélection et les paramètres techniques des transformateurs de type sec: 10 points clés que les ingénieurs et les achats sont les plus susceptibles de négliger

Dans des projets pratiques, the problem of selecting the wrong model for transformateurs secs is very common.

La capacité est suffisante, mais la hausse de température dépasse la norme;
Adaptation de tension, 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.Capacity selection: 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 transformateurs secs 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, tel que:

• Dyna11
• Oui0

3.Insulation level and temperature rise design

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

4.Selection of cooling method

UN: Refroidissement naturel, faible bruit
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.Partial discharge level

High quality dry-type transformers typically require:

• Partial discharge ≤ 10 PC

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

6.Contrôle du bruit

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 (intérieur)
• IP23/IP31 (anti drip, anti foreign object)

8.Energy efficiency and loss indicators

Critical loss parameters:

• perte à vide
• perte de charge

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

9.Normes, certifications, 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 Energy Technology Co., Ltée. est une entreprise de haute technologie intégrant R&D, fabrication et fourniture d'équipements électriques tels que des transformateurs, nouveaux composants énergétiques, armoires de distribution et onduleurs. Avec l’innovation technologique au cœur, nous nous concentrons sur la création de solutions d'alimentation haute fiabilité et hautes performances pour servir les clients du monde entier. Avec un système de contrôle de qualité strict et une certification standard internationale, nous continuons à produire d'excellents produits et permettons aux clients de construire des systèmes électriques sûrs et stables.