How to Choose Transformer Insulation Class-Leilang Electrical

info@leilang-electric.com

language

中文 English

NEWS CENTER

undefined

How to Choose Transformer Insulation Class

Release time:

2025-11-07

The insulation class of a transformer is a critical parameter that directly determines its operating temperature tolerance, service life, safety performance, and suitability for specific application scenarios. Selecting the right insulation class requires a comprehensive assessment of multiple factors to ensure the transformer operates reliably under actual working conditions. Below is a detailed guide on insulation class selection, along with an introduction to Leilang-Electric’s professional custom transformer services that meet high insulation requirements.

Key Factors for Selecting Transformer Insulation Class

1. Operating Temperature Environment

The core function of insulation materials is to resist thermal aging. Different insulation classes correspond to distinct maximum allowable operating temperatures (as specified by IEC standards). For example, Class A insulation is suitable for environments below 105°C, while Class F, H, and C can withstand higher temperatures of 155°C, 180°C, and above 220°C respectively. If the transformer is installed in high-temperature settings such as industrial workshops, power plants, or outdoor areas with intense sunlight, it is necessary to select a high insulation class (e.g., H or C) to avoid insulation breakdown caused by excessive temperature rise.

2. Load Characteristics

Transformers with frequent overloads, impulse loads, or variable loads generate more heat during operation, which accelerates insulation aging. In such cases, choosing an insulation class higher than the standard requirement (e.g., using Class F instead of Class B) can provide a larger temperature margin, effectively extending the transformer’s service life. For continuous full-load operation scenarios, the insulation class should also be prioritized to ensure long-term stable performance.

3. Application Industry and Safety Standards

Different industries have strict mandatory requirements for transformer insulation. For instance, transformers used in aerospace, military, and nuclear power fields often require Class H or C insulation due to their harsh operating environments and high safety demands. In contrast, general civilian power distribution scenarios may use Class F insulation to balance performance and cost. It is essential to comply with industry-specific standards (such as IEEE, ANSI, or local regulatory requirements) when making a selection.

4. Service Life Expectations

The service life of insulation materials follows the "10°C rule"—for every 10°C increase in operating temperature beyond the rated value, the service life of the insulation is halved. If the transformer is expected to have a long service life (e.g., 20-30 years) in key projects, investing in a higher insulation class (such as H or C) is a cost-effective choice, as it reduces maintenance costs and the risk of unplanned downtime.

Leilang-Electric: Custom Transformers with High Insulation Classes

As a professional transformer manufacturer with rich experience in R&D and production, Leilang-Electric focuses on providing customized solutions to meet the diverse needs of global customers. We fully understand the importance of insulation class in transformer performance and offer tailor-made transformers with insulation classes of at least Class F, Class H, and even Class C, covering a wide range of power ratings and application scenarios.

Our Advantages in Custom High-Insulation Transformers

Flexible Insulation Configuration: Based on your specific temperature requirements, load conditions, and industry standards, we can precisely match insulation materials (such as high-temperature-resistant epoxy resin, glass fiber, and silicone rubber) to ensure the transformer meets or exceeds the specified insulation class (F/H/C) performance indicators.

Strict Quality Control: Every custom transformer undergoes rigorous insulation performance tests, including dielectric strength testing, partial discharge testing, and thermal aging testing, to ensure reliable insulation performance under extreme conditions. Our products comply with international standards such as IEC 60076 and UL 1561, ensuring global market access.

Professional Technical Team: Our engineers have in-depth expertise in high-temperature insulation materials and transformer design. They will work closely with you to analyze project requirements, provide optimal insulation solutions, and resolve technical challenges in the customization process.

Wide Application Coverage: Our F/H/C class custom transformers are widely used in industrial automation, renewable energy (solar/wind power), electric vehicles, high-temperature testing equipment, and other fields, winning trust from customers with stable performance and durable quality.

Whether you need a Class F transformer for general industrial use, a Class H transformer for high-temperature workshops, or a Class C transformer for extreme environment applications, Leilang-Electric can provide you with efficient, reliable, and cost-effective customized solutions. Contact us today to discuss your specific needs and let our professional team create the perfect transformer for you.