Dry-type transformer coil temperature monitoring

Monitoring methodology

1. direct method of measurement::
   • thermistor method: The coil temperature is monitored in real time by embedding a Pt100 thermistor in the transformer coil. When the temperature reaches the set value, the thermistor feeds back the temperature change to the temperature controller.
   • optical fiber thermometry: Using IF-C fluorescent fiber optic sensor directly mounted on the transformer coil, the temperature signal is transmitted through fiber optics, which has the advantages of anti-electromagnetic interference, high voltage resistance and so on.
   • infrared thermometry: Measurement of the surface temperature of transformer coils using an infrared thermometer. This method is suitable for quick inspection, but can only measure the surface temperature.
2. simulation modeling approach::
   • The temperature variations of a dry-type transformer in actual operation are simulated by building a two- or three-dimensional model of the transformer. For example, a 2D rotationally symmetric model is used to simulate a dry-type transformer with an oblong coil to calculate the loss distribution and temperature variations within the coil.

Monitoring equipment

1. temperature sensor::
   • Pt100 thermistor: Commonly used for temperature monitoring of dry-type transformer coils with high accuracy and stability.
   • Fiber Optic Sensors: Suitable for high voltage, strong electromagnetic interference environment, can be installed directly inside the transformer coil.
2. Temperature Controller::
   • The temperature controller receives signals from the sensors and controls the functions of fan start/stop, over-temperature alarm and over-temperature trip according to the set temperature threshold.

application scenario

1. Commercial and industrial power distribution::
   • In high load scenarios such as shopping malls, office buildings, factories, etc., the coil temperature is monitored in real time by the intelligent temperature control system to ensure that the equipment operates in the best economic zone.
2. New Energy Power Generation::
   • In new energy power stations such as photovoltaic and wind power, dry-type transformers ensure smooth access to the grid for clean power through temperature monitoring systems.
3. infrastructure::
   • In scenarios such as subways, airports, and data centers, which require high continuity of power supply, dry-type transformers ensure the safe operation of the equipment through temperature monitoring and protection systems.