对电力变压器进行建模,确定不同工况下的热点位置

O. Yandulskyi, V. Mossakovskyi
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The main factor that causes the movement of the hot-spot point is the load factor of each phase, numbers 3 or 4 and 5 or 6. If there is an overload of some phase, then the hot-spot point will be on the surface of the low voltage winding of this overloaded phase. Originality. According to the information obtained from [1-4] it is seen that the movement of the hot-spot point is not paid attention at all. For example, in [2] the position of this point is considered unchanged and already known. The results obtained from the research have shown that this provision is not true. Practical value. The obtained results is seen in the possibility of providing recommendations for paying additional attention to monitoring the insulation of windings at a certain point during the current maintenance or post-accident inspection of the transformer. Tracking data of the position of the hottest point should be stored, especially if the overheating in this point take place. Conclusions. 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引用次数: 0

摘要

目的。用仿真方法研究油浸式电力变压器的热点位置变化。方法。利用电力变压器计算的理论与实践,采用标准化的热点点温度计算数学模型和数学建模。结果。图4 - 6中数字1表示初始条件,即变压器的额定负载;在额定负载和20°C环境温度下涡流损耗。初始条件下,热点点位于中支路低压绕组表面。环境温度的变化和对每个相位负载因子的涡流损耗的修正,数字2 - 4,导致该绕组表面热点点的移动。引起热点点移动的主要因素是各相的负荷系数,数字3或4和5或6。如果某一相过载,那么热点点就会在该过载相的低压绕组表面。创意。从[1-4]中得到的信息可以看出,热点点的运动完全没有被关注。例如,在[2]中,该点的位置被认为是不变的,并且是已知的。从研究中获得的结果表明,这一规定是不正确的。实用价值。所获得的结果可以在提供建议的可能性中看到,在当前维护或事故后检查变压器期间,在某一点上额外注意监测绕组的绝缘。应保存最热点位置的跟踪数据,特别是当该点发生过热时。结论。对S13-MRL-40、S13-MRL-160和S13-MRL-1000变压器进行了一次电压等级为10 kV的研究。建立并论证了这些变压器在不同工况下绕组绝缘表面热点的运动事实。考虑了六种操作条件。从图4 - 6可以看出,热点点通过改变其位置来响应操作条件的变化。在环境温度变化或涡流损耗的情况下,点在单相内在绕组表面移动。在负载损耗发生变化的情况下,该点可以在相之间移动。点在两相之间的移动是在负载不对称的情况下发生的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
MODELLING OF THE POWER TRANSFORMERS TO THE DETERMINATION OF THE HOT-SPOT POINT POSITION UNDER THE DIFFERENT OPERATING CONDITIONS
Purpose. Research of the position changing of the hot-spot point of the oil-immersed power transformers using simulation. Methodology. The theory and practice of calculation of power transformers, standardized mathematical models of calculation of the hot-spot point temperature and the mathematical modeling were used. Results. At Figures 4 - 6 under the number 1 indicate the initial conditions, namely the rated load of the transformer; eddy loses at rated load and 20 ° C ambient temperature. Under initial conditions, the hot-spot point is located on the surface of the low voltage winding at the middle leg. Ambient temperature changing and correction of eddy losses to the load factor of the each phase, numbers 2 - 4, cause the movement of the hot-spot point on the surface of this winding. The main factor that causes the movement of the hot-spot point is the load factor of each phase, numbers 3 or 4 and 5 or 6. If there is an overload of some phase, then the hot-spot point will be on the surface of the low voltage winding of this overloaded phase. Originality. According to the information obtained from [1-4] it is seen that the movement of the hot-spot point is not paid attention at all. For example, in [2] the position of this point is considered unchanged and already known. The results obtained from the research have shown that this provision is not true. Practical value. The obtained results is seen in the possibility of providing recommendations for paying additional attention to monitoring the insulation of windings at a certain point during the current maintenance or post-accident inspection of the transformer. Tracking data of the position of the hottest point should be stored, especially if the overheating in this point take place. Conclusions. The research was performed on transformers S13-MRL-40, S13-MRL-160 and S13-MRL-1000 with primary voltage evel 10 kV. The fact of movement of the hot-spot point on the insulation surface of the windings of these transformers under different operating conditions is established and demonstrated. Six operating conditions were considered. As can be seen from Figures 4 – 6, the hot-spot point responds to a change in operating conditions by changing its position. In case of the change in ambient temperature or eddy loss the point moves on the surface of the winding within a single phase. In case of the change in load losses, the point can move between phases. The movement of the point between the phases takes place under the load asymmetry.
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