Dry Type Isolation Transformer Model Parameters
04-16 2025 | By:
Dry Type Isolation Transformer Introduction
Dry-type isolation transformers are critical components in modern electrical systems, offering enhanced safety, energy efficiency, and adaptability to diverse environments. Unlike oil-filled transformers, they utilize solid insulation materials (e.g., epoxy resin) and advanced cooling techniques, making them ideal for applications requiring fire resistance, compact design, and minimal maintenance . This article explores their common models, technical parameters, and industrial applications.
Dry type isolation transformer model parameters
1. Models and Technical Parameters
Common Models
SG/SBK Series
Application: Widely used in industrial automation, medical equipment, and communication systems for voltage conversion and noise suppression.
Features:
Input voltage: 380V/415V/440V (adjustable) .
Output voltage: 220V/1140V (customizable based on load requirements) .
Capacity range: 1kVA–3000kVA .
Insulation class: F or H grade, withstanding temperatures up to 155°C .
QZB Series (Autotransformer)
Application: Suitable for voltage regulation in mining, tunnels, and explosive environments.
Features:
Input/output voltage: 6kV/10kV to 0.4kV .
Compliance: GB8286-2017 standards for flameproof and dustproof requirements .
Photovoltaic Step-Up Transformer
ZSG Series
Application: Designed for renewable energy systems (e.g., solar/wind power) and high-frequency equipment.
Features:
Frequency adaptability: 50Hz–400Hz .
Efficiency: ≥95% with low harmonic distortion (<0.1%) .
Key Parameters
Insulation Resistance: ≥500MΩ (primary to secondary) .
Cooling Methods: Natural air cooling (AN) or forced air cooling (AF) for overload conditions .
Protection Level: IP20 (standard) or IP23 for outdoor use to resist dust and moisture .
Waveform Distortion: <0.1%, ensuring stable power supply for sensitive equipment .
2. Applications
Industrial and Mining
KA/KBSG Series: Installed in explosive environments (e.g., coal mines) with flameproof enclosures, complying with IP20 protection and GB8286 standards .
Function: Provides stable power for ventilation systems, drilling platforms, and heavy machinery .
Healthcare and Laboratories
SG Series: Isolates sensitive medical devices (e.g., MRI machines) from grid interference and ensures leakage current control .
Renewable Energy
ZSG Series: Integrates with solar/wind inverters to manage voltage fluctuations and enhance grid compatibility .
Urban Infrastructure
Used in subway systems, data centers, and commercial buildings for compact, fire-safe power distribution .
3. Advantages Over Oil-Filled Transformers
Safety: No flammable oil, reducing fire risks .
Environmental Adaptability: Operates in temperatures from -15°C to 45°C and humidity up to 95% .
Low Maintenance: Resistant to corrosion and dust, with a lifespan exceeding 30 years .
Dry-type isolation transformers, such as the SG, QZB, and ZSG series, are indispensable in modern electrical systems due to their versatility, safety, and high efficiency. From harsh mining environments to precision medical facilities, their advanced insulation and adaptive designs ensure reliable performance across industries. For detailed specifications, refer to standards like IEC439 and GB5226 .
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