Smart control method for transformer cooler

Abstract

The invention discloses a smart control method for a transformer cooler. The method includes the steps of obtaining the real-time temperature T of a winding of a transformer, setting the constant operation temperature value of the transformer, a control unit determining the cooler control strategy according to the real-time temperature T and the temperature changing rate DT/Dt, and outputting a control signal to the transformer cooler according to the strategy. The working of the transformer cooler can be controlled timely and effectively to lower the temperature of a transformer, prevent the transformer from being damaged, and prolong the service lifetime of the transformer. Switching of the cooler set of a cooler can be conducted to prevent frequent switching of cooler sets and prevent switches from being damaged. Stable operation of an entire cooler is ensured, and the transformer operates more stable.

Description

technical field [0001] The invention belongs to the technical field of power cooling control, and in particular relates to an intelligent control method for a transformer cooler. Background technique [0002] During the actual operation of the transformer, a large amount of heat is generated, which makes the internal temperature of the transformer rise, the insulation system of the transformer ages, and even the equipment is damaged due to high temperature. Therefore, for large oil-immersed transformers, it is generally equipped with a forced oil circulation air-cooled cooler or a forced oil circulation water-cooled cooler to enhance the heat dissipation effect of the transformer and reduce the operating temperature of the transformer. [0003] The "110 (66) kV ~ 500kV oil-immersed transformer (reactor) operation specification" issued by the State Grid Corporation of China stipulates that the oil temperature of the upper layer of the oil-immersed air-cooled and self-cooled t...

AI Technical Summary

Problems solved by technology

This method cannot smoothly adjust the switching of the cooler with the change of temperature and load current. When several cooler groups are put into operation at the same time, it is easy to cause oil flow impact, and the high-speed flow of transformer oil is easy to cause oil flow electrification, which is easy to form a transformer. Hidden dangers of internal failures affect its safe and stable operation

[0005] Transformer coolers start and stop frequently with changes in internal temperature, and switch failures are prone to occur. Several groups of coolers are turned on or off at the same time, and sometimes it is impossible to effectively control the cooling system in real time for the hot spots of the transformer, which may be due to local high temperatures. As a result, the insulation aging in local areas inside the transformer is accelerated, and even damage occurs

[0006] Moreover, the temperature of the top layer of the transformer or the actual load of the transformer cannot fully explain the temperature condition of the hottest point of the inner winding of the transformer.

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