Transformer oil is a fractionated product of petroleum, and its main components are alkanes and naphthenes, which are light yellow transparent liquids. It is a kind of insulating oil, in oil-immersed transformers, transformer oil mainly plays the role of insulation and cooling. So what are the hazards of the transformer oil level being too high or too low, and how to monitor it?
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The abnormal oil level of the transformer is mainly due to the oil level being too high and too low.
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1. The oil level is too high
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When the oil level of the transformer is higher than the highest oil level line, different methods should be used to deal with it according to the cause of the cause. If it is caused by overload, the load should be reduced; If the three-phase current is seriously unbalanced and the current of a certain phase exceeds the rated value, the load should be adjusted to achieve the basic balance; If the temperature of the transformer oil rises due to the abnormality of the cooler, and the oil expands due to heating, causing the oil level to rise, it should be checked whether the cooler is blocked by dust, whether the upper and lower valves of the oil pipe are opened, whether the fan and submersible pump are running normally, whether the temperature of the cooling medium is appropriate, etc., and timely treatment should be made to restore the normal operation of the cooler; If the oil level is too high due to too much oil in the transformer, the oil should be drained to an appropriate height.
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2. The oil level is too low
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When the oil level of the transformer is significantly lower than the oil level corresponding to the oil temperature at that time, and the oil level is below the minimum oil level line or is invisible, the oil level is too low. When the transformer leaks, the oil level is too low when the oil is not replenished in time due to the need for oil discharge, or the original oil level of the transformer is not high, and the load of the transformer drops suddenly or the external ambient temperature decreases significantly. When the oil level is too low, the transformer core and windings will be exposed to the air, which is easy to be damp and reduce the insulation capacity, and may even cause insulation breakdown. Therefore, when it is found that the oil level of the transformer is too low, the cause should be found and dealt with.
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If the oil level is low and no oil leakage is found, the operator should report and replenish the qualified transformer oil of the same type as soon as possible. If the oil level is significantly reduced due to an oil leak, measures should be taken to eliminate the oil leak and refuel immediately to bring the oil level back to normal. If there is a large amount of oil leakage, the oil level drops too much and endangers the safe operation of the transformer, it should be reported to the dispatcher to apply for the deactivation of the transformer. For the transformer cooled by large strong oil circulating water, if the oil level is found to be low, check whether there is oil splash in the water to prevent water seepage in the oil from endangering the insulation of the transformer, and find out the cause before refilling. On the other hand, it is normal for the transformer oil level to rise or fall due to seasonal changes. If the oil level is too high in summer, try to drain the oil, and if the oil level is too low in winter, try to refuel to maintain the normal oil level and ensure the safe operation of the transformer.
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Therefore, the transformer should maintain a normal oil level during operation. In order to monitor the oil level of the transformer, the oil pillow of the transformer is equipped with a glass tube oil level gauge or a magnetic needle type oil level gauge. When the transformer is running, the oil level of the transformer changes with the change of the transformer oil temperature under normal circumstances. When checking the oil level, pay attention to whether it is a fake oil level. False oil levels will occur when the oil pillow respirator is blocked, the vent hole of the explosion-proof tube is blocked, the oil mark pipe is blocked, or the oil level gauge is damaged. At this time, although the changes in transformer oil temperature, ambient temperature, load, etc. are normal, the oil level does not change or changes abnormally.
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How to detect the oil level of a transformer
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In order to grasp the performance changes of oil in operation, find out the causes, take corresponding treatment measures, eliminate equipment defects in time, prevent harm to equipment due to unqualified oil quality, and ensure the continuous, stable, safe and economical operation of equipment. The company provides the use of liquid level sensors to detect the oil level of transformers.
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As we all know, the liquid level sensor is used for the measurement of various liquid levels because of its particularity, and can be applied to the continuous detection of liquid level, material level or level under special conditions such as high temperature, high pressure, strong corrosion, easy crystallization, anti-clogging, anti-cold knotting and solid powder and granular materials, and can be widely used in detection and control in various industrial processes.
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The liquid level sensor is a common sensor for measuring the position of the liquid level, it is the height of the position into the form of electrical signal for output and remote transmission to the operation control room, for the secondary instrument or computer for centralized display, alarm or automatic control, the liquid level sensor is a module circuit, with the advantages of acid resistance, moisture resistance, shock resistance, corrosion prevention, etc., the circuit contains a constant current feedback circuit and an internal protection circuit, which can make the maximum output current not exceed 28mA, so that the power supply can be reliably protected and the secondary instrument is not damaged. Secondly, the good structure and installation method have made the liquid level sensor widely used in petroleum, chemical industry, metallurgy, energy, light industry, monitoring, environmental protection, urban water supply, food processing, medicine, water conservancy engineering, air conditioning engineering and other fields.
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For any questions such as product consultation, product customization, agency, technical inquiry, quotation, etc., please contact Xingyi Hotline: 400-600-4496!
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