Dry Transformer's temperature control system and protection method

The safe operation and service life of the Dry Transformer largely depends on the safety and reliability of the transformer winding insulation. The winding temperature exceeds the insulation withstand temperature and the insulation is damaged, which is one of the main reasons that the transformer cannot work normally. Therefore, it's vital to watch the operational temperature of the electrical device and its alarm management. Therefore, the temperature control system must be considered when a Dry Transformer is selected. Then let's take a look at the temperature control system and protection methods of the Dry Transformer. Here are some answers.

Here is the content list:

l Temperature control system

l The protection method of Dry Transformer.

Temperature control system

Automatic fan control

The temperature signal is measured by the Pt100 thermistor that is embedded in the hottest part of the low-voltage winding. The Dry Transformer load increases and the operating temperature rises. When the winding temperature reaches 110°C, the system automatically starts the fan for cooling. When the winding temperature drops to 90°C, the system automatically stops the fan.

Over-temperature alarm, trip

The temperature signal of the winding or iron core is collected through the PTC non-linear thermistor embedded in the low-voltage winding. When the temperature of the Dry Transformer winding continues to rise, if it reaches 155°C, the system can output an associate over-temperature alarm signal. If the temperature continues to rise to 170°C, the Dry Transformer can no longer continue to operate, and an over-temperature trip signal must be sent to the second protection circuit, and the Dry Transformer should be tripped quickly.

Temperature display system

Dry Transformer uses the Pt100 thermistor embedded in the low-voltage winding to measure the temperature change value and directly displays the temperature of each phase winding (three-phase inspection and maximum value display, and can record the highest temperature in history), and the highest temperature can be 4 Up to 20mA analog output if it needs to be transmitted to a remote computer (distance up to 1200m).

The protection method of Dry Transformer.

Dry Transformer usually uses IP20 protective housing to prevent solid foreign objects with a diameter greater than 12mm and small animals such as rats, snakes, cats, and birds from entering, causing malignant failures such as short-circuit power failures, and providing a safety barrier for live parts. If you need to install the Dry Transformer outdoors, you can choose an IP23 protective shell. In addition to the above IP20 protection function, it can also prevent water droplets within a 60° angle to the vertical. However, the IP23 shell will reduce the cooling capacity of the transformer, so pay attention to the reduction of its operating capacity when selecting.

If you are interested in our Dry Transformer products or have other needs, please feel free to contact us. Our official website is https:// www.sntoom.com/. Our company adheres to the corporate culture of "quality first, customer first", and has always made unremitting efforts to become a professional Dry Transformer supplier in the industry.