Transformer
DRY TYPE TRANSFORMERS
Applications
Dry type transformer is suitable for power transmission and distribution system, hotel, restaurant, hospitals, shopping malls, bank buildings ,stadiums, airports, stations especially heavy load centers and places with special fire protection requirements. Dry type transformer is the best choice for specific markets where safety or ecology are main concerns.
WHY UNION
1. +20 years experience R&D team, derived from a 60 years of history transformer manufacturer in China.
2. Full range of transformer types with customized functions are available.
3. CE & ISO certificated.
Below are the tests conducted by Varelen before delivery. Other tests required by clients can also be done accordingly.
Insulation resistance
Resistance of all windings
Check voltage ratio and vector group
No-load test at rated frequency and rated voltage
Impedance test
Withstand voltage test
Induced over-voltage withstand test
Partial discharge measurement
Product Features:
1. The three-limb iron core is made of oblique cut Grain-oriented, seven-step silicon steel laminations insulated on both sides, guaranteeing low losses and low noise. These values are even improved by laser treatment. It is protected on the surface with a flash-proof varnish in order to prevent the sheet from corrosion and to reduce the noise.
2. Clamping frame: it is processed by CNC cutting, bending and then one-time punch forming, the hole’s size is accurate and the appearance looks delicate.
3. The winding coil is made of oxygen-free copper, class H for main insulation materials and coil is insulated by NOMEX paper of DUPONT brand, LV winding is isolated by copper foils. All these make the heat-resistant is up to 220℃, with excellent overload capacity and low loss, but high efficiency.
4. Union practices strictly exclusive casting system of F(155℃) or H(180℃), and the epoxy resin is injected and casted in the vacuum machine, so it's highly insulated, dust-proof and moisture-proof, which ensures stable and reliable performance.
5. Tap changer is available to adapt respective network conditions.
Main specifications:
|
Dry-type transformer type |
Cast resin |
|
Manufacturing standards |
IEC, ANSI, NFC52 etc |
|
Rated capacity |
up to 25MVA |
|
Rated Voltage |
Up to 36KV |
|
Phases |
single or three phase |
|
Tapping |
With tapping links or on-load tap changer |
|
Impedance |
On request |
|
Frequency |
50Hz or 60Hz |
|
Vector groups |
Dy, Yy, Yd as standard. Other on request |
|
class insulation |
According to IEC 60085, Class F or Class H |
|
Temperature rise |
With ambient temperature in accordance with IEC 60076-11 |
|
Type of cooling |
AN/AF |
|
IP rate |
IP00 to IP54 |
|
Environment class |
E2 |
|
Climate class |
C2 |
|
Fireproof class |
F1 |
