En omfattende guide til valg og tekniske parametere for transformatorer av tørr type: 10 nøkkelpunkter som ingeniører og innkjøp mest sannsynlig vil overse

I praktiske prosjekter, the problem of selecting the wrong model for tørr-type transformatorer is very common.

Kapasiteten er tilstrekkelig, men temperaturstigningen overstiger standarden;
Spenningstilpasning, 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.Kapasitetsvalg: 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 tørr-type transformatorer 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, slik som:

• Dyn11
• Yyn0

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 kjøling, lite støy
AV: Forsert luftkjøling, 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 (innendørs)
• IP23/IP31 (anti drip, anti foreign object)

8.Energy efficiency and loss indicators

Critical loss parameters:

• no-load loss
• belastningstap

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 høyteknologisk bedrift som integrerer R&D, produksjon og levering av kraftutstyr som transformatorer, nye energikomponenter, distribusjonsskap og omformere. Med teknologisk innovasjon som kjernen, vi fokuserer på å skape kraftløsninger med høy pålitelighet og høy ytelse for å betjene globale kunder. Med et strengt kvalitetskontrollsystem og internasjonal standardsertifisering, vi fortsetter å produsere utmerkede produkter og gjør det mulig for kunder å bygge trygge og stabile kraftsystemer.