250kva Cast Coil Transformer Dry Type 400v Cast Resin Electrical
Distribution Transformers
Product overview
WINLEY cast coil 250 kVA cast resin dry‑type transformers are
designed, built, and factory‑tested to meet the highest industry
standards — including UL, cUL, CSA and IEEE — and provide reliable
indoor electrical distribution where safety, low maintenance and
environmental compliance are priorities, making them ideal for
commercial buildings, data centers, hospitals and light industrial
applications.
Product Photos
Main data
| 250kVA transformer specification data |
| No. | Particulars | Unit | Specification |
| 1 | Type | ~ | cast resin, dry type |
| 2 | Rated capacity | kVA | 250 |
| 3 | No. of Phase | ~ | 3 |
| 4 | Primary voltage | V | 400 |
| 5 | Secondary voltage | V | 400Y/230 |
| 6 | Tapping type | ~ | off-circuit |
| 7 | Tapping type | % | ±2*2.5% |
| 8 | Cooling method | ~ | AN |
| 9 | Rated frequency | Hz | 50 |
| 10 | Vector group | ~ | Dyn11 |
| 11 | Insulation class | ~ | F (155℃) |
| 12 | Temperature rise | K | 100 |
| 13 | Winding material | ~ | copper |
| 14 | Core material | ~ | silicon steel |
| 15 | Enclosure | ~ | IP00 |
| 16 | Service condition | ~ | indoor |
| 17 | Sea level | M | ≤1000 |
| 18 | Standard | ~ | IEC60076 |
Features & benefits
- Safety and fire resistance: Cast‑resin insulation eliminates
combustible transformer oil, reducing fire risk and making the unit
safer for indoor and densely occupied spaces.
- Low maintenance: Dry construction minimizes routine maintenance and
removes oil leak concerns.
- High reliability: Copper windings and silicon steel core ensure
efficient performance and long service life.
- Thermal performance: F‑class insulation and 100 K temperature rise
rating for robust thermal endurance in demanding environments.
- Flexibility: Off‑circuit tap changer provides precise voltage
adjustment for site conditions and load variations.
- Standards compliant: Designed and manufactured to IEC 60076 for
global compatibility and quality assurance.
- Quiet operation: Dry‑type construction and AN cooling reduce noise
compared with oil‑filled units, ideal for noise‑sensitive
locations.
Technical drawings
Production process
FAQ
1. Q: Can I have a sample order?
A: Yes, we welcome sample order to test and check quality.
2. Q: What is the lead time?
A: Mass production time 15-25 days.
3. Q: How long is the warranty?
A: 24 monthes from B/L. If there are any accessory problems,just
provide the photos of damaged accessory,then we will provide free
service. According to the number of products,we will provide easily
damaged accessories for free. we also can provide technical support
if you need.
4. Q: Is OEM/ODM available?
A: Yes,it is! We are manufacturer with our own R&D team, we can
customize products according to customer's drawing or requirements.
Customized services:
a. Customized color and special function.
b. Customized box.
c. Print customer's logo.
d. Your other ideas about product, we can help you design and put
them into production. The above customized services must be
confirmed before production.
5. Q: How to control the products quality?
A: Our company owns the core technology ,all kinds of products hold
CE certificate. We have professional engineers. Workers are
strictly required to make products according to the drawings. Each
process has technical instructors.The QC supervisors will regularly
inspect the production. We will do products performance tests
during production, and comprehensive quality tests when the
products is completed.
