Single-Phase Padmount Transformers

1. Transformer Testing (ANSI C57.12.90)

All transformers undergo standard commercial tests, including:
No-Load Losses: Tested at rated current.
Load Losses: Total losses at rated current.
Percent Impedance: Measured at rated current.
Excitation Current Test: Conducted at 100% voltage.
Ratio Tests: Performed across all tap settings.
Polarity and Phase Relation Tests: Ensures proper orientation.
Induced Potential Tests: Verifies durability under operational conditions.
Impulse Tests: Full wave and reduced wave performance analysis.

2. Transformer Dimensions and Ratings

Transformer Specifications
Specification Details
KVA Ratings 25, 50, 75, 100, 125, and 150
No. of Phases Single-Phase
Frequency 60 Hz
Primary Voltage 2,400 V – 19,920 V
Secondary Voltage 120 V – 600 V
Tapping Range ±2 × 2.5%
Winding Material Copper, Aluminum
Cooling Type ONAN, KNAN
Feed Type Loop Feed, Radial Feed
Fluid Type Non-PCB Mineral Oil
Connection Type Dead Front
Mounting Pad-Mounted

3. Standards and Certifications

Sound Level: Compliant with NEMA TR1 Standard.
IEEE Compliance: Meets IEEE C57.12.00 Standards.
UL Certification: UL Listed.
Efficiency: DOE 2016 Standard Compliant.
Temperature Rise Options: 65°C, 65/75°C, 75°C.
Enclosure Type: NEMA Type 3R – Stainless Steel.

4. Primary Protection Devices

Bay-O-Net Expulsion Fuse: Standard protection feature.
MOV Surge Arrestor: Available on demand.

5. Tank and Material Specifications

Tank Material: Coated Steel.
Tank Coating System: Complies with IEEE Std C57.12.28 and C57.12.29.

6. Quality Control and Warranty

Quality System: ISO 9001 Certified.
Routine Tests: Conducted in accordance with ANSI® and IEEE®.
Warranty: Industry-standard coverage provided.