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变压器绝缘油中微水的测试方法

评估绝缘材料中的湿度,是确保变压器可靠性和使用寿命的一个重要因素。绝缘油中的湿度在不断地变化,因而可能对质量造成不利影响。另外,大部分湿度分布在绝缘纸中。湿度会影响固体和液体绝缘材料的介电击穿强度,并影响纤维素绝缘材料的老化速度以及过载期间的气泡形成倾向。
Evaluating the humidity in insulating materials is an important factor to ensure the reliability and service life of transformers. The moisture in insulating oil is constantly changing, which may adversely affect the quality. In addition, most humidity is distributed in insulating paper. Humidity will affect the dielectric breakdown strength of solid and liquid insulation materials, and affect the aging rate of cellulose insulation materials and the tendency of bubble formation during overload.
环境温度、负载、老化、泄漏以及其他因素会引起湿度的不断变化。因此,随着变压器温度的循环变化,需连续监视和诊断。这对过载或峰值负载的变压器更有必要。变压器绝缘系统中的总湿度由纤维素和液体中的水分含量决定。绝缘纸和绝缘油中的湿度关系仅取决于温度。当温度增加时,水在绝缘油中的溶解性(溶液含水能力)增加,水分会从绝缘纸转移到绝缘油中。
Environmental temperature, load, aging, leakage and other factors will cause changes in humidity. Therefore, with the cyclic variation of transformer temperature, continuous monitoring and diagnosis should be carried out. This is more necessary for overload or peak load transformers. The total humidity in the transformer insulation system is determined by the moisture content in the cellulose and liquid. The humidity relationship between insulating paper and insulating oil depends only on temperature. As the temperature increases, the solubility of water in the insulating oil (water content of the solution) increases, and the water will be transferred from the insulating paper to the insulating oil.
当温度降低时,这一过程则会反向进行,但水分从液体介质流动到固体绝缘材料的速度相当缓慢。因此,绝缘油冷却期间的含水量高于加热期间。因此,要准确掌握变压器中的湿度分布,必须知道设备在其热循环中所处的位置。要通过监视液体介质中的水分含量了解绝缘纸的真实湿度,变压器必须处于相对稳定的温度状态。
When the temperature decreases, the process reverses, but the flow of water from the liquid medium to the solid insulation material is quite slow. Therefore, the water content of the insulating oil during cooling is higher than that during heating. Therefore, in order to accurately grasp the humidity distribution in the transformer, it is necessary to know the position of the equipment in its thermal cycle. To understand the true humidity of the insulation paper by monitoring the moisture content in the liquid medium, the transformer must be in a relatively stable temperature state.
山东变压器油
绝缘油中水分的相对饱和度需要标准化,因绝缘油中的湿度与温度变化紧密相关,并且在变压器主箱中存在一定的温度梯度(通常箱的顶部温度要高于底部)。
The relative saturation of water in insulating oil needs to be standardized, because the humidity in insulating oil is closely related to temperature changes, and there is a certain temperature gradient in the main box of transformer (usually the top temperature of the box is higher than the bottom).
要完成标准化,专家系统分析需推断底部的相对饱和度百分数。可通过采用传感器报告的温度和其采样位置获得。该分析假定变压器顶部温度比底部温度高出10℃。如采用顶部或底部之外的位置作取样点,则必须指定温度偏差。通过湿度的相对饱和度以及具体测量温度,专家系统将以一定相对饱和度百分数作绝缘纸湿度的计算结果。
To achieve standardization, expert system analysis needs to deduce the percentage of relative saturation at the bottom. It can be obtained by using the temperature of the sensor report and its sampling position. The analysis assumes that the temperature at the top of the transformer is 10 degrees higher than that at the bottom. If the position at the top or bottom is taken as the sampling point, the temperature deviation must be specified. Through the relative saturation of humidity and the specific measurement of temperature, the expert system will calculate the humidity of insulation paper with a certain percentage of relative saturation.
必须注意,该计算只基于单次测量的结果信息,可能未反映出绝缘纸真正的湿度浓度,特别是在变压器刚经历剧烈的温度变化后。如果专家系统确定变压器处于平衡状态(绝缘纸既不释放也不吸收湿度),则计算第2个相对饱和度百分数,该饱和度为变压器处于平衡状态时的最近30次相对饱和度百分数测量结果的平均值。
It is important to note that the calculation is based only on the results of a single measurement and may not reflect the true humidity concentration of the insulation paper, especially after the transformer has just undergone drastic temperature changes. If the expert system determines that the transformer is in equilibrium (insulation paper neither releases nor absorbs moisture), the second relative saturation percentage is calculated, which is the average of the last 30 relative saturation percentages measured when the transformer is in equilibrium.
前面记录的温度和变化决定了是否存在平衡的判断标准。有4种可用警报。湿度警报显示时以“P”作首个字符。第2个字符为0~3的数字。P0警报表示传感器故障。P1警报表示未执行分析。P1、P2和P3警报均依赖于相对饱和度百分比。警报的条件:1为绝缘油湿度的相对饱和度百分比≥50,但<75;2为绝缘油湿度的相对饱和度百分比≥75。
The temperature and change recorded in front determine whether there is a criterion for balance. There are 4 kinds of alerts available. When humidity alarm is displayed, the word "P" is used as the first character. The second character is 0~3. The P0 alarm indicates the sensor failure. The P1 alert indicates no execution analysis. P1, P2 and P3 alerts all depend on relative saturation percentage. The condition of alarm: 1 is the relative saturation percentage of the humidity of the insulating oil (> 50), but < 75; 2 is the relative saturation percentage of the humidity of the insulating oil (> 75).
上文内容是由山东变压器油提供,想要了解更多的内容,可以关注我们的网站:http://www.jnwdsh.com,在网站中有更多的精彩内容,希望你能为你提供帮互助!
The above content is provided by Shandong transformer oil. If you want to know more, you can pay attention to our website: http://www.jnwdsh.com. There are more wonderful content in the website. Hope you can help each other!
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