Publish Time: 2023-06-26 Origin: Site
dry-type transformer is a type of distribution transformer that does not use oil as a cooling and insulating medium, but instead uses solid materials such as epoxy resin or silicone rubber. Dry transformer has many advantages over oil-filled transformer, such as lower fire and environmental risk, lower maintenance cost, higher reliability and efficiency, and easier installation and recycling. In this article, we will introduce what dry type transformer is, how to install it, and how to use it properly.
What is dry-type transformer?
How to install dry-type transformer?
How to use dry-type transformer?
dry-type transformer is a transformer that uses cast resin or open wound coils as the primary and secondary windings. The coils are either vacuum cast or impregnated with epoxy resin or silicone rubber, which provide high dielectric strength and thermal conductivity. The coils are also protected by a metal or plastic enclosure, which can be ventilated or sealed.
1. Location: dry type transformer should be installed in a clean, dry, well-ventilated, and accessible place. The transformer should be protected from direct sunlight, rain, snow, dust, humidity, corrosive gases, vibrations, and mechanical impacts. The transformer should also be away from heat sources, flammable materials, and electromagnetic interference.
2. Clearance: dry type transformer should have enough clearance around it for air circulation, heat dissipation, maintenance, and safety. The clearance should follow the manufacturer’s recommendations and the local regulations. Generally, the clearance should be at least 0.5 meters from the walls and 1 meter from the ceiling.
3. Grounding: dry type transformer should be properly grounded to ensure personal safety and equipment protection. The grounding should follow the manufacturer’s instructions and the local standards. The grounding conductor should be connected to the transformer’s earthing terminal and to a suitable earth electrode.
4. Wiring: dry type transformer should be wired according to the nameplate data and the wiring diagram provided by the manufacturer. The wiring should follow the local codes and regulations. The wiring should be securely fastened and insulated to prevent short circuits and electric shocks.
1. Inspection: dry-type transformer should be inspected regularly to check its physical condition, electrical performance, and environmental factors. The inspection should follow the manufacturer’s guidelines and the maintenance schedule. The inspection should include visual inspection, insulation resistance test, winding resistance test, voltage ratio test, no-load loss test, load loss test, impedance test, etc.
2. Cleaning: dry transformer should be cleaned periodically to remove dust, dirt, moisture, and foreign objects that may affect its cooling and insulation. The cleaning should follow the manufacturer’s instructions and the safety precautions. The cleaning should use soft brushes, dry cloths, compressed air, or vacuum cleaners. The cleaning should avoid using water, solvents, abrasives, or sharp tools.
3. Protection: dry-type transformer should be protected from abnormal conditions that may damage its components or cause failures. The protection should include overcurrent protection, overvoltage protection, temperature protection, and surge protection devices.
Dry-type transformer is a safe, environment-friendly, and cost-effective alternative to oil-filled transformer for distribution applications. dry transformer has many benefits such as lower fire and environmental risk, lower maintenance cost, higher reliability and efficiency, and easier installation and recycling. By following the manufacturer’s recommendations and the local standards, dry-type transformer can provide reliable and efficient power distribution for various applications.