I. Core Differences (Summarized in one sentence)

* **Oil-immersed cylindrical pole-mounted transformer:** Uses oil insulation and cooling; inexpensive, good heat dissipation, and strong outdoor weather resistance; however, it carries risks of oil leakage and flammability.

* **Dry-type epoxy-cast cylindrical pole-mounted transformer:** Uses epoxy resin solid insulation; fireproof, explosion-proof, maintenance-free, and safer; however, it is more expensive and has slightly weaker heat dissipation.

II. Detailed Comparison (Most Practical Version)

1. Insulation and Cooling Media

Oil-Immersed

Insulation + Cooling: Transformer oil

Dry-Immersed Epoxy Casting

Insulation: Epoxy resin casting and curing

Cooling: Natural air cooling

2. Safety (Most Important Difference)

Oil-Immersed

Oil is flammable, posing a risk of fire and oil leakage pollution.

Dry-Immersed

Flame-retardant, non-combustible, leak-free, and pollution-free. Suitable for places with high fire protection requirements.

3. Maintenance Required

Oil-Immersed

Requires regular maintenance: oil level checks, oil changes, leak detection, and anti-aging.

Dry-Immersed

Mostly maintenance-free, only requires cleaning and dust prevention.

4. Environmental Adaptability

Oil-Immersed

More resistant to moisture, dust, and harsh outdoor environments.

Dry-Immersed

Susceptible to long-term moisture and condensation, more suitable for indoor or clean outdoor environments.

5. Size and Weight

Oil-Immersed

Relatively heavy, larger cylindrical tank.

Dry-Immersed

Compact structure, smaller cylindrical shape.

6. Noise and Loss

Oil-Immersed

Lower noise.

Dry-Immersed

Slightly higher noise, slightly weaker overload capacity.

7. Price

Oil-immersed: Inexpensive, high cost-performance ratio

Dry-type: Higher cost, higher selling price

8. Applicable Scenarios

Oil-immersed cylindrical pole-mounted transformer: Suitable for:

Rural power grids, suburbs, streetlights

General outdoor pole-mounted installation

Projects with limited budgets and large quantities

Dry-type epoxy-cast cylindrical pole-mounted transformer: Suitable for:

Dense urban areas, residential areas, parks

High fire protection requirements:

Near shopping malls, hospitals, and schools

Scenarios requiring no oil and no pollution

III. Super Simple Mnemonic

Oil-immersed: Inexpensive, durable, good heat dissipation, but requires maintenance and is susceptible to fire.

Dry-type epoxy: Safe, maintenance-free, more environmentally friendly, but more expensive and susceptible to moisture.