En omfattende guide til udvælgelse og tekniske parametre for transformatorer af tør type: 10 nøglepunkter, som ingeniører og indkøb med stor sandsynlighed vil overse

I praktiske projekter, the problem of selecting the wrong model for tør-type transformere is very common.

Kapaciteten er tilstrækkelig, men temperaturstigningen overstiger standarden;
Spændingstilpasning, 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.Valg af kapacitet: 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 tør-type transformere 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, som f.eks:

• Dyn11
• Ja 0

3.Insulation level and temperature rise design

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

4.Selection of cooling method

AN: Naturlig køling, lav støj
AF: 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.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 (indendørs)
• IP23/IP31 (anti drip, anti foreign object)

8.Energy efficiency and loss indicators

Critical loss parameters:

• tab uden belastning
• belastningstab

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

9.Standarder, certifications, and documents

Common requirements:

• IEC / 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., Ltd. er en højteknologisk virksomhed, der integrerer R&D, fremstilling og levering af strømudstyr såsom transformere, nye energikomponenter, distributionsskabe og invertere. Med teknologisk innovation som kernen, vi fokuserer på at skabe høj pålidelighed og højtydende strømløsninger til at betjene globale kunder. Med et strengt kvalitetskontrolsystem og international standard certificering, vi fortsætter med at producere fremragende produkter og gør det muligt for kunderne at bygge sikre og stabile strømsystemer.