Residential Pad mounted Transformer Single Phase 25Kva 6.6KV To
120V Dual Windings Electric Power Distribution Transformer UL/cUL
Listed
Single-phase pad-mounted transformers are compact, self-contained
electrical device.It has the characteristics of small size, light
weight, low noise, low loss, safety and reliability.It is widely
used in residential quarters, commercial centers, hospitals, parks,
schools, etc.
WINLEY’s single‑phase pad‑mounted distribution transformers are UL
and cUL certified, designed to applicable ANSI, IEEE, NEMA, and DOE
standards, and built for safe, reliable operation in underground
electrical distribution networks.
Main data
| Transformer Type: | Liquid Filled Pad Mounted |
| Phase: | Single Phase |
| Transformer Feed Type: | Loop Feed |
| Capacity: | 25 KVA |
| Vector Group: | II6 |
| Primary Voltage: | 6600V |
| Secondary Voltage: | 120/240 V (L-N-L) |
| Secondary Phasor: | Dual Windings, Single Phase |
| Secondary BIL: | 30 KV |
| Frequency: | 100 Hz |
| Temperature Rise: | 65°C |
| Insulation Rating: | E |
| Cooling Class: | ONAN; Self-Cooled |
| Impedance: | 5.00% |
| Efficiency Standard(s): | Meets DOE 2016 Standards, Meets ANSI/IEEE Standards |
| K-Factor Rating (Harmonic Mitigation): | K-1 (Standard) |
| Winding Material: | Copper |
| Ambient Temperature Rating: | 40°C |
| Core Material: | Grain Oriented Steel |
| Dimensions*: | 33.05-W x 37.1-D x 24.8-H |
| Total Weight (Liquid Filled)*: | 10259.38 lbs |
Key Features & Drawing
- Primary: 6600 V Delta, 8.7 kV class, 95 kV BIL, dead‑front ANSI Type II
terminations with 200 A load‑break elbows
- Secondary: 120/240 V (L‑N‑L), dual windings, ANSI Type II epoxy bushings and
spade terminals; neutral grounded to tank
- Tap Changer: 5‑position, hot‑stick operable (±2.5% steps); front‑compartment
HV location
- Protection & Switching: Bayonet expulsion and partial‑range current‑limiting fuses on
primary; 4‑position load‑break switch (200 A, 8.7 kV), surge
arrester included
- Construction: Grain‑oriented steel core, copper windings, coated steel tank and
cabinet, low‑profile lockable lid with lifting lugs
- Enclosure & Finish: NEMA 3R weatherproof wiring compartment; bell green epoxy finish;
tamper‑resistant design
Testing
- Winding Resistance Test
- Insulation Resistance Test
- Voltage Ratio Error Test
- Applied voltage withstand test
- Induced over voltage withstand test
- No-load Loss (Wattage) Test
- Load Loss (Wattage) Test
- Short-circuit Impedance
- seal test
Type testing
- Lightning Impulse Test Record
Specification
| Single phase Pad mounted Transformer Specification |
| Rating | High voltage(kV) | No Load Loss | On load Loss | Height | Depth | Width | Oil Weight(kg) | Total Weight(kg) |
| (kVA) | (mm) | (mm) | (mm) |
| 15 kVA | 34.5/19.92
13.8/8
13.2/7.6
12.47/7.2
or others | 50 | 195 | 840 | 740 | 610 | 45 | 294 |
| 25 kVA | 80 | 290 | 840 | 740 | 610 | 68 | 362 |
| 37.5 kVA | 106 | 360 | 840 | 760 | 610 | 75 | 476 |
| 50 kVA | 135 | 500 | 840 | 810 | 610 | 93 | 553 |
| 75 kVA | 190 | 650 | 840 | 860 | 610 | 132 | 672 |
| 100 kVA | 280 | 1010 | 910 | 1200 | 965 | 230 | 714 |
| 167 kVA | 435 | 1530 | 1000 | 1200 | 965 | 265 | 913 |
| 250 kVA | 550 | 2230 | 1250 | 1300 | 1430 | 325 | 1106 |
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.
