A Thermal Fault Detection System for Transmission Transformer

Abstract

The invention provides a thermal fault detecting system for a power transmission transformer. The emphasis is that thermal faults are monitored, the thermal fault detecting system for the power transmission transformer can judge the thermal faults in advance before detection is performed through a three-ratio method,, if the faults are judged to be the thermal faults, gas component detection is carried out in advance, if solid insulating material decomposition is not involved, the three-ratio method continues to be used for detection, and if solid insulating material decomposition is involved in monitoring, a secondary detection and judgment method is selected for detection. In this way, inaccurate or unstable measurement caused by the influence of multiple factors can be avoided to the maximum extent, the detection effect of the three-ratio method is better, and the influence on diagnosis by carbon dioxide (CO2) and carbon monoxide (CO) generated by solid insulation faults is avoided.

Description

technical field [0001] The invention relates to a thermal fault detection system of a power transmission transformer, which belongs to the technical field of power transmission. Background technique [0002] Due to the excellent heat dissipation and insulation properties of transformer oil, oil-immersed power transformers are widely used in power systems. During normal operation, the transformer will slowly age under the influence of mechanical stress, heat, electricity and other factors, and generate some flammable gases. If there is an internal latent fault in the transformer, the energy released from the faulty part will accelerate the cracking of the insulating material, which will greatly increase the content of dissolved gas in the oil and the rate of gas production. By obtaining transformer oil samples, gas chromatography can be used to obtain the content of each component of dissolved gas in the oil, so as to evaluate the health of the transformer or analyze the fai...

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Problems solved by technology

[0009] Of course, the three-ratio method also has obvious shortcomings when judging thermal faults of transformers. For example, it can be found from the analysis of the gas production mechanism that when the content of each gas component and the gas production rate do not exceed the standard, the transformer is in normal operation. , the three-ratio method diagnosis is invalid, only when the gas content exceeds the standard or the gas production rate exceeds the standard, or there is sufficient basis to determine that the transformer is faulty, the three-ratio method diagnosis will be meaningful

[0010] Also, when the transformer fault involves the decomposition of solid insulating materials, a large amount of carbon dioxide (CO2) and carbon monoxide (CO) will be generated, but the three-ratio method recommended by the guidelines does not refer to carbon dioxide (CO2) and carbon monoxide (CO) information, so this has a great impact on the diagnosis of thermal faults of solid insulation

[0011] Therefore, in order to overcome the above defects, it is necessary to improve the three-ratio method currently used to improve the accuracy and stability of diagnosing thermal faults of power transformers, and at the same time avoid misjudgment operations or other factors that have adverse effects

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