Acoustic-surface-wave-technology-based device and method for detecting dissolved gases in transformer oil
A surface acoustic wave and transformer oil technology, which is applied in measuring devices, analyzing fluids using sound waves/ultrasonic waves/infrasonic waves, and using sound waves/ultrasonic waves/infrasonic waves for material analysis. Time and cost are high, and the effect of strong anti-interference ability, high detection sensitivity and simple device is achieved
Inactive Publication Date: 2016-12-21
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology
Among them, the conventional chromatographic detection technology needs to take oil samples on site and send them to the laboratory for analysis. The operation procedures are complicated, the time and cost are high, the detection cycle is long, and the operating personnel cannot grasp and monitor the operation status of the transformer at any time. The link may increase the detection error; although the online monitoring technology of dissolved gas in oil can increase the detection frequency, it is limited by the installation of the device, the oil and gas separation technology is immature, the degassing process requires carrier gas, the gas separation efficiency is low, and there is cross sensitivity in gas detection The problem
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Embodiment Construction
[0032] The invention provides a detection device and method for dissolved gas in transformer oil based on surface acoustic wave technology.
[0033] The arc discharge generated during the transformer fault will cause the transformer oil to decompose and produce a variety of fault characteristic gases dissolved in the transformer oil, and the gas-sensitive film made of different materials will absorb the corresponding fault characteristic gas when placed in the transformer oil after the fault ( See Table 1).
[0034] Table 1 Correspondence between doping substances and characteristic gases
[0035]
[0036] The detection device is composed of several gas detection sensors and a data collector; as figure 1 Shown is the mechanism diagram of the gas detection sensor, including the crystal substrate 2 installed on the base plate 1, the input interdigital transducer 3 installed on the crystal substrate 2, two multiple couplers, and the sound path with the gas sensitive film 4. ...
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The invention discloses an acoustic-surface-wave-technology-based device and method for detecting dissolved gases in transformer oil, and belongs to the field of power system. The device comprises a gas detection sensor and a data collector; the gas detection sensor includes a crystal substrate, an input interdigital transducer, multi-strip couplers, a gas sensitive film, an output interdigital transducer and a signal interface; and the data collector comprises a microprocessor, an amplifying filtering circuit, a frequency mixing filtering circuit, a frequency measurement circuit and a radio frequency antenna. The gas detection sensor of the acoustic-surface-wave-technology-based device and method for detecting the dissolved gases in the transformer oil is used for detection of the dissolved gases in the transformer oil by use of acoustic surface wave technology, the acoustic-surface-wave-technology-based device is wireless and passive, by use of a dual acoustic path structure, the influence of measurement environment and other factors can be eliminated, through the replacement of the gas sensitive film, different gases can be measured, compared with the detection method of the dissolved gases in the transformer oil in the prior art, the method has the advantages of simple device, continuous measurement, no requirement of modification of a transformer cabinet, and the like.
Description
technical field [0001] The invention belongs to the field of power systems, and in particular relates to a detection device and method for dissolved gas in transformer oil based on surface acoustic wave technology. Background technique [0002] Large-scale power transformers play a pivotal role in connecting power grids of different voltage levels in the power system, and their operational reliability is closely related to the stability and safety of the power system. For example, the State Grid Corporation has more than 10,000 power transformers in operation with a voltage level of 110kV and above. Improving the operation and maintenance level of transformers, especially the ability to diagnose early latent faults, will help reduce the failure probability of transformers and ensure the power system. The reliability of power supply is of great significance, so the fault detection of power transformers is particularly important. At present, various online monitoring technolog...
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IPC IPC(8): G01N29/02G01N29/036
CPCG01N29/022G01N29/036G01N2291/0226G01N2291/02809
Inventor 李二霞李玉凌常方圆孙智涛许保平樊勇华
Owner CHINA ELECTRIC POWER RES INST