Een uitgebreide gids voor de selectie en technische parameters van droge transformatoren: 10 belangrijke punten die ingenieurs en inkoop het meest waarschijnlijk over het hoofd zien

Bij praktijkprojecten, the problem of selecting the wrong model for droge transformatoren is very common.

De capaciteit is voldoende, maar de temperatuurstijging overschrijdt de norm;
Spanningsaanpassing, 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 droge transformatoren 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, zoals:

• Dyn11
• Ja0

3.Insulation level and temperature rise design

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

4.Selection of cooling method

EEN: Natuurlijke koeling, laag geluidsniveau
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 (indoor)
• IP23/IP31 (anti drip, anti foreign object)

8.Energy efficiency and loss indicators

Critical loss parameters:

• nullastverlies
• belasting verlies

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

9.Standards, 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 Energietechnologie Co., Ltd. is een hightech onderneming die R&D, productie en levering van stroomapparatuur zoals transformatoren, nieuwe energiecomponenten, verdeelkasten en omvormers. Met technologische innovatie als kern, we richten ons op het creëren van zeer betrouwbare en krachtige energieoplossingen om wereldwijde klanten te bedienen. Met een strikt kwaliteitscontrolesysteem en internationale standaardcertificering, we blijven uitstekende producten produceren en stellen klanten in staat veilige en stabiele energiesystemen te bouwen.