Isolation dry-type transformer

　　Overview of Isolating Dry-Type Transformers

　　An isolating dry-type transformer is a device that utilizes the principle of electromagnetic induction to change the alternating current voltage. Its core feature is that the primary winding and the secondary winding are completely electrically isolated from each other. Moreover, it adopts a dry-type insulation structure, meaning it does not use liquid insulating media (such as transformer oil) but relies on air or other solid insulating materials for insulation. This type of transformer finds extensive applications in fields such as power transmission, distribution, and industrial control.

　　Working Principle

　　The working principle of an isolating dry-type transformer is based on the law of electromagnetic induction. When the primary winding is connected to an alternating current power source, an alternating magnetic flux is generated in the iron core. This alternating magnetic flux passes through both the primary winding and the secondary winding simultaneously, thereby inducing an electromotive force in the secondary winding. Since there is no direct electrical connection between the primary winding and the secondary winding, electrical isolation is achieved. By adjusting the turns ratio of the primary winding to the secondary winding, the magnitude of the output voltage can be changed.

　　Features and Advantages

　　Electrical Isolation: The electrical isolation between the primary winding and the secondary winding can effectively prevent electric shock accidents and improve electrical safety. For example, in places with extremely high safety requirements, such as hospital operating rooms and mines, the use of isolating dry-type transformers can avoid the risk of electric shock caused by electrical faults.

　　Dry-Type Structure: Adopting a dry-type insulation structure eliminates the need for transformer oil, thus avoiding environmental pollution and safety hazards caused by oil leakage. At the same time, maintenance is relatively simple, and operating costs are lower. Moreover, the dry-type structure gives the transformer better fire and explosion-proof performance, making it suitable for installation in indoor environments with high fire safety requirements.

　　Strong Short-Circuit Withstand Capability: Due to the reasonable winding structure and excellent performance of insulating materials, isolating dry-type transformers have strong short-circuit withstand capability and can withstand large short-circuit currents without damage when a short-circuit fault occurs.

　　Stable Operation: Under normal operating conditions, isolating dry-type transformers can maintain stable output voltage and current, providing reliable power supply for loads. They have good temperature characteristics and can operate stably over a wide temperature range.

　　Application Scenarios

　　Power Systems: In the process of power transmission and distribution, isolating dry-type transformers can be used for voltage transformation, electrical isolation, and improving power quality. For example, in distribution systems, they convert high-voltage electrical energy into low-voltage electrical energy suitable for user consumption and enhance power supply safety through electrical isolation.

　　Industrial Control: In industrial automation production lines, CNC machine tools, and other equipment, isolating dry-type transformers can provide a stable power supply for control circuits while achieving electrical isolation to prevent interference signals from affecting the control system and ensure the normal operation of equipment.

　　Medical Equipment: Many medical devices in hospitals, such as CT machines and magnetic resonance imaging (MRI) instruments, have extremely high requirements for power supply stability and safety. Isolating dry-type transformers can provide clean and stable power for these devices and achieve electrical isolation to safeguard the safety of patients and medical staff.

　　Rail Transit: In rail transit systems such as subways and light rails, isolating dry-type transformers can be used in traction power supply systems, lighting systems, etc., to provide reliable power support for train operation and station equipment.

　　Selection and Usage Precautions

　　Selection:

　　Capacity Selection: Choose an isolating dry-type transformer with an appropriate capacity based on the power requirements of the load. Generally, the rated capacity of the transformer should be slightly larger than the total power of the load to ensure that the transformer will not be overloaded during normal operation.

　　Voltage Ratio Selection: Determine the voltage ratio of the transformer according to the requirements of the input voltage and output voltage. At the same time, consider the voltage fluctuation range and select a transformer with a suitable voltage regulation ratio.

　　Insulation Class Selection: Choose an appropriate insulation class based on the temperature, humidity, and other conditions of the operating environment. A higher insulation class means better heat resistance of the transformer, but the cost is also relatively higher.

　　Usage Precautions:

　　Installation Environment: Isolating dry-type transformers should be installed in a dry, well-ventilated environment free from corrosive gases and dust. Avoid installing them in places with high temperatures, high humidity, or strong vibrations, as these conditions may affect the performance and lifespan of the transformer.

　　Load Matching: Ensure that the load matches the capacity of the transformer during use to avoid overload operation. Overloading can cause the transformer temperature to rise, accelerate insulation aging, and even damage the transformer.

　　Regular Maintenance: Regularly inspect and maintain the isolating dry-type transformer, including checking for external damage, loose fasteners, and whether the insulation resistance meets the requirements. If any problems are found, they should be promptly addressed to ensure the safe operation of the transformer.

　　Common Faults and Troubleshooting Methods

　　Winding Short-Circuit: This may be caused by factors such as winding insulation damage or overload operation. Troubleshooting methods include replacing the damaged winding, strengthening the insulation treatment, and adjusting the load.

　　Iron Core Faults: Problems such as multiple grounding points of the iron core or loose iron core can lead to issues like transformer overheating and increased noise. These can be addressed by checking the iron core grounding situation and tightening the iron core bolts.

　　Reduced Insulation Resistance: This may be caused by moisture or aging of insulating materials. The transformer can be dried or the aged insulating materials can be replaced.