Here are the typical specifications for single-phase pole-mounted transformers, covering key technical and construction parameters. If you need to provide transformer parameter information, please contact our company.

Core Electrical Specifications

1. Rated Capacity:

Common kVA ratings: 5, 10, 15, 25, 37.5, 50, 75, 100 kVA

Note: Higher ratings (e.g., 167 kVA) exist but are less common.

2. Voltage Ratings:

Primary (HV): 7.2 kV, 7.62 kV, 11 kV, 13.2 kV, 13.8 kV, 33 kV (ANSI/IEEE)

IEC Standards: 11 kV, 22 kV

Secondary (LV): 120/240V (split-phase), 230V (IEC), 240/480V

3. Frequency:

50 Hz or 60 Hz (region-dependent)

4. Vector Group:

Typically Dy1 (Delta primary, Wye secondary) or Yy0 (Wye-Wye)

5. Impedance (%Z):

Standard range: 1.5–4% (e.g., 2.5% for 25 kVA)

Critical for fault current protection coordination.

6. Efficiency & Losses:

No-Load Losses (Core Losses): ≤0.3% of rated kVA

Load Losses (Copper Losses): 1–2% of rated kVA

7. Insulation Class:

Primary: Class 15 kV, 28 kV BIL (Basic Impulse Level)

Secondary: Class 5 kV BIL

Construction & Mechanical

1. Core Material:

CRGO (Cold Rolled Grain-Oriented) silicon steel or amorphous metal (lower no-load losses).

2. Cooling Method:

ONAN (Oil-Natural, Air-Natural) for mineral/oil-filled units.

Dry-Type: Encapsulated or ventilated (less common for pole-mount).

3. Tank:

Corrugated or finned steel for heat dissipation.

Corrosion-resistant paint (e.g., ANSI 61 Gray).

4. Fluid:

Mineral oil, FR3 (ester fluid), or silicone (fire-resistant options).

5. Bushings:

HV: Porcelain or polymer (e.g., 15 kV 200A bushing).

LV: Porcelain or polymer (600V).

6. Weight & Dimensions:

50 kVA example: ~300–400 kg (oil-filled); height: 1.2–1.5 m.

Protection & Accessories

1. Lightning Arresters:

Mounted on HV bushing (e.g., 10 kV distribution-class).

2. Protective Devices:

Pressure-relief device (explosion vent).

Thermowell for oil temperature monitoring.

3. Secondary Compartment:

NEMA 3R enclosure with terminal blocks and ground pad.

4. Taps:

±2×2.5% or ±4×2.5% HV taps (manual adjustment).

Optional Features

Partial Core (amorphous metal) for high efficiency.

Smart monitoring: IoT sensors (oil temp, load, fault detection).

Submersible design for flood-prone areas.

Animal guards (bird/raccoon protection).

Key Selection Considerations

1. kVA Sizing: Based on peak demand + 25% future growth.

2. Voltage Drop: ≤3% at full load (per utility standards).

3. Loss Evaluation: TOC (Total Owning Cost) analysis for efficiency.

4. Location: Coastal (salt-resistant) vs. urban (noise-sensitive).