What Are The Characteristics Of Cast Resin Transformers?

Compared with oil-immersed transformers, dry-type transformers have no oil-related risks (fire, explosion, pollution), so they don’t require independent rooms per electrical standards. Their safe operation relies on temperature control, IP-rated protection, and suitable cooling methods—below is a detailed breakdown.

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1 1. Core Advantage vs. Oil-Immersed Transformers: No Independent Room Required

2 2. Temperature Controller: Critical for Insulation & Service Life

3 3. Safety Protection Methods: IP-Rated Safety Shields

4 4. Cooling Methods (Correction: SCB10 Uses Air Cooling, Not Water Cooling)

5 OUR CERTIFICATE

6 OUR PROJECTS

1. Core Advantage vs. Oil-Immersed Transformers: No Independent Room Required

Key Difference: Dry-type transformers use air/gas as insulation/cooling media, eliminating oil leakage, fire, or environmental pollution risks.
Room Requirement: Electrical equipment standards and technical specifications do not mandate independent rooms. They can be installed directly in power distribution rooms, basements, or integrated cabinets—saving space and construction costs.

2. Temperature Controller: Critical for Insulation & Service Life

The temperature controller is a core component to protect winding insulation (the main factor affecting transformer life and safety):

Core Function: Monitor the working temperature of windings in real time. When the temperature exceeds the insulation’s allowable limit, trigger alarms or adjust cooling (e.g., start fans) to prevent insulation damage.
Why It Matters: Excessive winding temperature degrades insulation layers, leading to abnormal transformer operation or even failures. The controller ensures temperature stays within safe ranges (e.g., ≤180°C for Class H insulation).

3. Safety Protection Methods: IP-Rated Safety Shields

Dry-type transformers use IP-rated shields to adapt to different environments, preventing external hazards:

(1) Common IP Ratings & Functions

IP Rating	Core Protection Scope	Application Scenario
IP20	Blocks solid debris ≥12mm (e.g., large dust) and prevents finger contact.	Indoor dry, clean environments (e.g., office building power distribution rooms).
IP23	Based on IP20, adds protection against dripping water at 60° angles.	Outdoor or semi-outdoor installations (e.g., open-air industrial parks).

(2) Key Protection Effects

Prevents intrusion of animals (mice, snakes, cats, birds) and large debris, avoiding short circuits, power outages, or other serious faults.
Forms a natural safety barrier for the transformer body.

(3) Note for IP23 Use

The sealed structure of IP23 shields reduces heat dissipation efficiency. When using IP23 for outdoor installation, avoid overloading and appropriately reduce the operating capacity to prevent overheating.

4. Cooling Methods (Correction: SCB10 Uses Air Cooling, Not Water Cooling)

The original “water cooling” is a misnomer—SCB10 series dry-type transformers adopt air cooling (AN/AF), the standard for dry-type models:

(1) Natural Air Cooling (AN)

Working Principle: Relies on natural convection and radiation for heat dissipation.
Performance: Supports long-term continuous operation at rated capacity, with stable efficiency and low noise (no moving parts).

(2) Forced Air Cooling (AF)

Working Principle: Adds axial fans to actively blow air over windings, enhancing heat dissipation.
Performance: Increases transformer output capacity by 50% (e.g., a 200kVA transformer can carry 300kVA).
Applicable Scenarios: Intermittent overload operation (e.g., peak industrial loads) or emergency overload (e.g., power grid faults).
Caution: Long-term overload is uneconomical—overload causes a sharp increase in load loss and characteristic impedance voltage, accelerating insulation aging.