Single Phase Pad Mounted Transformer
Product Overview
Single-phase pad-mounted transformers are compact, self-contained electrical units housed in secure, lockable outdoor cabinets. These transformers are oil-insulated, self-cooled, and designed with dead-front construction, available in both loop and radial feed configurations.
The single phase pad mounted transformers produced by WINLEY ELECTRIC have obtained UL/cUL certification. The products fully comply with or even exceed ANSI/IEEE, DOE, and CSA standards. The rated capacity ranges from 10KVA to 250KVA, and the primary voltage can reach 34.5kV. The monthly delivery capacity exceeds 800 units, and can be delivered quickly within 4 weeks.
Single phase pad mounted transformers 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.
Design Capability
| Capacity | 15-333kVA |
| Primary Vollage | 34.5KV/19.92KV、13.8KV/7.957KV、13.2KV/7.62KV、12.47KV/7.2KV、4160GrdY/2400V or other |
| Secondary Voltage | 120/240V、240/480V、347/600V or other |
| Feed Type | Loop Feed 、 Radial Feed |
| Insulation Fluids | ONAN、KNAN、Envirotemp™ FR3™ |
| Frequency | 50Hz、60Hz |
| BIL | 30V-150V |
| Standards | ANSI/IEEE C57.12.20, C5712.38, CS7.12.90 CSA C227.3 DOE NEMA |
Standard Features
- Automatic pressure relief device
- Fluid fill and drain provisions
- Laser engraved nameplate
- Floating lock pocket for easy alignment
- Decal bushing designations
- Welded domed tank cover
- Tamper strips of noncorrosive material
- Crowned tank
- Removable sill
- Hinged door with stainless steel hinge pins and barrels
- Ground strap fromX2 to tank ground
- HV bushing wells for dead front elbow connectors
- High voltage bushing wells-200A and low voltage bushin
Accesscries
| Main Accessries | Option Accessries |
| HV Bushings*2 | Multiple voltages or taps |
| LV Bushings*3 | Stainless steel tank, tank bottom, sill, door, and/or hardware |
| Tap Changer*1 | Service entrance in the sill |
| Bay-O-Net Fuse*1 | Various spades and terminals available for secondary bushings |
| ELSP Fuse*1 | High-voltage bushing inserts |
| Oil Level Gauge*1 | Ground connectors |
| Pressure Relief Valve*1 | One piece high-voltage bushings |
| Thermomter*1 | Load break switches |
| Fill Plug*1 | Drain/sampling valve |
| Drain Valve*1 | Pressure vacuum gauge |
| Ground Strap Copper*1 | Liquid level gauge |
| Grounding Spade Terminal*2 | Temperature gauge |
Specification
|
Rated Capacity |
High voltage | No Load Loss | On load Loss | Height | Depth | Width | Oil Weight | Total Weight |
| (kVA) | (kV) | （W） | （W） | (mm) | (mm) | (mm) | (kg) | (kg) |
| 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 |
Product drawings
Performance Characteristic
- Safe and Reliable: The pad-mounted transformer incorporates efficient insulation protection and advanced heat dissipation systems, along with a well-designed cable compartment, ensuring the safety and reliability of the power equipment.
- Strong Overload Capacity: It can handle twice the standard load for 2 hours and 1.6 times the standard load for 7 hours, without compromising its operational lifespan.
- Elbow Plug Design: The high-voltage incoming cable connection utilizes an elbow plug, allowing for easy and safe plug-and-play operation even when the system is energized.
- Robust Defense Capability: The transformer is equipped with enhanced defense mechanisms, effectively mitigating instantaneous voltage spikes and protecting the equipment from damage.
- Dual Fuse Protection:
- a. A dual-sensitive plug-in fuse (temperature and current) safeguards the secondary side of the transformer.
- b. A backup current-limiting protection fuse (ELSP) protects against internal faults on the high-voltage side.
- Long Service Life: Built with high-quality materials and advanced manufacturing technology, the transformer is highly durable and offers a significantly longer service life compared to conventional oil-immersed transformers.
- Flexible Configurations: Pad-mounted transformers are available in terminal and ring network types. The ring network type allows one transformer to supply power to another simultaneously, enabling seamless switching and improving power supply distance and reliability.
- Energy-Efficient and Eco-Friendly: Designed with a focus on sustainability, the transformers emphasize energy efficiency and environmental protection (primarily using FR3 environmentally friendly vegetable oil). This ensures high energy efficiency, minimizes energy waste, and reduces environmental pollution.
Testing
* Ratio, Polarity, and Phase Relation: Assures correct winding ratios and tap voltages; checks insulationof HV and LV circuits. Checks entire insulation system to verily all live-lo·ground clearances.
*Resistance: This test verifies the integrity of intemal high-voltage and low-voltage connections;provides data for loss upgrade calculations.
* Applied Potentiat: Applied lo both high-voltage and low-vollage windings, this test stresses the entireinsulation system to verify all live-to-ground clearances.
*Induced Potential: 3.46 times normal plus 1000 voits for reduced neutral designs.
* Loss Test: These design verification tesls are conducted to assure that guaranteed loss values are meland that test values are within design tolerances. Tests include no-load loss and excitation current
along with impedance voltage and load loss.
* Leak Test: Pressurizing the tank to 7 psig assures a complete seal, with no weld or gasket leaks, toeliminate the possibility of moisture infiltration or fluid oxidation.
Testing Process
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