Reliable Dry-Type Transformer Temperature Control System

A Dry-type Transformer Temperature Control System is essential to ensure the safe and efficient operation of modern power transformers. Dry-type transformers are widely used for voltage conversion, converting high-voltage electricity into lower voltages to power various equipment. However, these transformers generate significant heat during operation, which, if left uncontrolled, can accelerate insulation aging, reduce efficiency, and cause severe failures such as short circuits or fires.

A robust temperature control system helps maintain optimal transformer performance by actively monitoring and regulating temperature levels. Below is a detailed overview of its key components and working process.

Key Components of a Dry-Type Transformer Temperature Control System

1. Temperature Sensor

The temperature sensor measures the real-time temperature of critical transformer parts, primarily the windings and core. Platinum resistance temperature detectors (RTDs) are commonly used because their resistance changes predictably with temperature. Sensors installed on windings and the core provide accurate data to the controller, as these parts generate the most heat during operation and are sensitive to temperature variations.

2. Temperature Controller

The temperature controller is the system's core, receiving temperature data from sensors and comparing it to preset thresholds. It performs multiple functions such as:

►Displaying temperature readings

►Setting parameters (alarm and trip temperatures)

►Triggering alarms and tripping mechanisms

►Supporting remote monitoring via RS485, Ethernet, or other communication interfaces

When temperatures reach alarm or trip thresholds, the controller takes immediate action to alert personnel or disconnect the transformer to prevent damage.

3. Alarm Device

The alarm device warns operators of abnormal temperature conditions using methods such as sound and light alarms or SMS notifications. On-site alarms alert local personnel, while SMS alarms instantly inform maintenance teams remotely, ensuring timely response to potential issues.

4. Cooling Device

The cooling device reduces transformer temperature through two primary methods:

►Natural Air Cooling: Utilizes ambient air convection; suitable for small-capacity transformers but with limited cooling efficiency.

►Forced Air Cooling: Employs fans to increase airflow over the transformer surface, improving heat dissipation. Fans are strategically installed to optimize airflow across windings and core areas.

How the Dry-Type Transformer Temperature Control System Works

1. Continuous Temperature Monitoring

Sensors continuously measure winding and core temperatures, transmitting data as electrical signals to the controller. Measurement intervals can be configured based on operational needs.

2. Threshold Comparison

The controller compares real-time temperature data with preset alarm and trip thresholds:

►If below alarm temperature: Continuous monitoring continues.

►If alarm temperature is reached: Alarm devices activate (audible, visual, or SMS alerts).

3. Cooling Activation

If temperatures continue rising near trip levels, the controller activates the cooling device to reduce transformer heat through forced air circulation.

4. Tripping Protection

If, despite cooling, temperatures exceed the trip point, the controller triggers a trip signal to cut power supply, preventing overheating-related damage and ensuring transformer safety.

Choose Ztelec Group for Reliable Transformer Temperature Control Solutions

With over 60 years of expertise, Ztelec Group provides high-performance dry-type transformers equipped with advanced temperature control systems for industrial, commercial, and utility applications worldwide. Contact us today to ensure safe, efficient, and long-lasting transformer operation.