Can Amorphous Alloy Dry Type Transformers Operate Effectively in High Temperatures?

As the demand for energy-efficient transformers surges in the industrial sector, amorphous alloy dry-type transformers have attracted much attention for their excellent no-load loss performance. However, a key question has emerged: Can these high-efficiency devices continue to operate stably in high-temperature environments?

Core Advantages Solid: High-Temperature Tolerance of Amorphous Strip
The core of amorphous alloy dry-type transformers lies in their core material - amorphous alloy strip. The Curie temperature (magnetic transition point) of this material is usually between 210°C and 250°C, which is much higher than the maximum operating temperature allowed for conventional dry-type transformers (e.g., 155°C for F-class insulation and 180°C for H-class insulation). This means that within the highest temperature rise range of the transformer's normal operation, the magnetic properties of amorphous alloys (such as permeability and saturation flux density) will fluctuate slightly with temperature, but the low-loss characteristics of its core will be maintained, and the core itself will not experience structural demagnetization or performance mutations.

Insulation system: a key barrier to high temperature resistance
The winding insulation system of a dry-type transformer is the core line of defense against high temperatures. Modern amorphous alloy dry-type transformers generally use high-grade insulation materials:

Mainstream grade: F-class (maximum allowable 155°C) or H-class (maximum allowable 180°C) insulation systems are widely used.
Material composition: Usually combined with high-performance Nomex® paper (or equivalent aromatic polyamide), epoxy resin (VPI vacuum pressure impregnation or winding process) or high-temperature resistant polyester film, etc.
Reliable guarantee: These materials have been strictly designed and processed, and can still provide excellent electrical insulation performance and mechanical strength at rated temperature rise or even high temperatures caused by short-term overload to ensure winding safety.
Heat dissipation design: Optimize adaptability to high temperature environments

The heat dissipation capacity of dry-type transformers directly affects their temperature rise. Amorphous alloy dry-type transformers fully consider the high-temperature operation requirements in their design:
Efficient heat dissipation structure: Adopt optimized airway design, increase the heat dissipation surface area (such as corrugated oil tanks or add heat sinks), promote natural air convection or cooperate with forced air cooling (if necessary), and effectively dissipate internal heat to the environment.
Temperature control system: Standard temperature sensors (such as PT100 platinum resistance) are used in conjunction with intelligent temperature controllers to monitor the temperature of key parts (core, winding) in real time, realize high temperature warning, alarm and even automatic start and stop control of the fan, and provide intelligent protection for safe operation in high temperature environments.
Standards and verification: authoritative endorsement of high temperature operation
The design and production of amorphous alloy dry-type transformers strictly follow international (such as IEC 60076-11) and national standards (such as GB/T 22072-2019 "Technical Parameters and Requirements for Dry-type Amorphous Alloy Core Distribution Transformers"). These standards clearly specify the temperature rise limits of transformers at rated load and different ambient temperatures (such as up to 40°C or 45°C) and the corresponding thermal performance test methods. Through strict type tests and routine tests (including temperature rise tests), its operating ability under the harsh working conditions defined by the standards is fully verified.
Key points for high temperature environment application: benefits and balance
Although amorphous alloy dry-type transformers can operate at high temperatures, it is crucial to follow the specifications:
Clear ambient temperature: The maximum ambient temperature of the equipment installation site must be clear when selecting.
Load management: Pay attention to the load rate in a continuous high temperature environment to avoid long-term overload operation to increase temperature rise.
Ventilation guarantee: Ensure that the installation space is well ventilated to meet the heat dissipation requirements.
Regular maintenance: Keep the equipment clean, the airway unobstructed, the radiator free of dust, and the temperature control system functioning normally.