Transformer cooling system control strategy and method

Abstract

The invention relates to a transformer cooling system control strategy and method. The transformer cooling system control strategy and method is provided according to the actual measuring results of top layer oil temperature, bottom layer oil temperature, environment temperature, cooler inlet oil temperature and cooler outlet oil temperature of a transformer and the operating condition of transformer operating time parameters, and the internal temperature of the transformer is reduced by controlling starting and stopping of a cooler. The method can effectively carry out transformer cooling system control according to multiple influence factors, the operating condition of the transformer body and external environment influences, and therefore the effect of avoiding failures occurring to the interior of the transformer or acceleration of insulation aging caused by high temperature is achieved.

Description

technical field [0001] The invention belongs to the field of intelligent control of transformer coolers in power transmission and transformation equipment, and in particular relates to a strategy and method for controlling the cooling system of the transformer based on various monitoring objects in the actual operation of the transformer. Background technique [0002] During the actual operation of the transformer, a large amount of heat can be generated, causing the internal temperature of the transformer to rise rapidly, resulting in accelerated aging of the transformer insulation system, equipment damage due to high temperature, and even the risk of explosion. For large oil-immersed transformers, the cooling system generally uses forced oil circulation air-cooled coolers or forced oil circulation water-cooled coolers. Today, the control method is mainly through the temperature of the top layer of transformer oil or the actual load of the transformer. As a basis for judgme...

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Problems solved by technology

[0003]1. Only monitoring the temperature of the top layer of the transformer or the actual load of the transformer cannot fully explain the actual situation inside the transformer

[0004]2. The main control method today is to adjust the number of transformer coolers running when the temperature of the oil top layer reaches a certain temperature or when the actual load reaches a certain amount. Its internal temperature, this method cannot be adjusted smoothly with changes in temperature and load current

[0005]3. Transformer coolers start and stop frequently with the change of internal temperature, which is prone to switch failure. Several groups of coolers are turned on or off at the same time, sometimes unable to Real-time and effective cooling system control for transformer hot spots, which may cause accelerated aging of insulation in local areas of the transformer due to local high temperature, or even damage

[0006]4. During the use of the transformer, its insulation will have a long-term continuous aging process. In this aging process, the insulation performance of the transformer continues to decline, and during the continuous operation of the transformer, due to long-term operation inside the transformer, the accumulation of debris in some areas may cause the oil circuit to be unsmooth. The temperature of the hottest point of the transformer increases. The control strategy of the traditional transformer cooling system does not take this factor into account. It simply calculates the temperature of the hottest point based on the measured temperature or load conditions to control and adjust the cooler, which shortens the life of the transformer and is not conducive to the long-term operation of the transformer. Require

This invention is only a control device for setting strategy rotation switching, which cannot effectively monitor the internal temperature of the transformer in real time and adjust the cooling system in real time

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