High-power high-frequency transformer double-layer oil temperature monitoring system and method thereof

Abstract

The invention discloses a high-power high-frequency transformer double-layer oil temperature monitoring adjusting system and a method thereof. The adjusting system comprises an oil temperature acquisition circuit for collecting oil temperature data in an oil immersed transformer, a filtering protection circuit used for receiving the data of the oil temperature acquisition circuit, processing the data and sending the data to a control circuit, the control circuit used for receiving the signal of the filtering protection circuit, converting the signal into a digital quantity and comparing the digital quantity with a preset value to judge whether temperature is too high or not, a PWM wave output circuit which is connected to the output port of the control circuit and outputs a PWM wave with an expected duty cycle when the temperature is higher than the preset value, a driving circuit which is connected between the PWM wave output circuit and the inverter circuit in a transformer oil temperature control main circuit, and a power supply circuit. According to the system and the method, the transformer can safely work in the safe condition of ensuring a service life and is well adapted to the characteristics of nonlinearity, variability and complexity in working.

Description

technical field [0001] The invention belongs to the field of regulation or control systems, in particular to a monitoring system for monitoring double-layer oil temperature of high-power high-frequency transformers. Background technique [0002] With the continuous increase of power grid capacity, higher requirements are put forward for the safe operation of the power system and the reliability of power supply. As an important equipment in power system, oil-immersed transformer has been widely used in the field of power engineering. High-power high-frequency high-voltage transformers have been widely used in engineering fields in recent years. The high-voltage silicon stack rectifier bridge of the transformer is completely immersed in the insulating oil of the transformer. Therefore, the temperature rise is an important indicator for evaluating whether the transformer can operate normally. To carry out the necessary temperature rise test. [0003] When the transformer is i...

AI Technical Summary

Problems solved by technology

However, considering that the heat and temperature rise of transformers with large capacity and high frequency are very serious, it is only adjusted by air cooling after the temperature detection of the upper layer without certain power control. This control strategy can be adjusted under certain circumstances. The effect will be unsatisfactory, such as the internal short circuit of the winding, this strategy can only drive the fan to cool down continuously, but cannot stop the transformer, which brings potential safety hazards;

[0006] Furthermore, some high-power high-frequency transformers for specific purposes work in a harsh environment. They often work in an environment where the external direct sunlight temperature is higher than 40 degrees. Very serious, when the temperature exceeds the maximum operating temperature allowed by the insulating material, it will accelerate the aging of the insulating material and then affect the life of the transformer. It is obviously not enough to only solve the internal heat dissipation problem, and it is necessary to adopt certain strategies to control the external high temperature influence

Images