Aikana toiminta of the transformer, the toiminta and maintenance must be carried out in strict accordance with the operating procedures of the main transformer. When the transformer is normal, two coolers are put into operation automatically, and one cooler is for standby. When the standby pump starts automatically, the standby pump must be checked. The main reasons for the automatic startup of the standby pump are: the winding temperature reaches 105 ° C, the maximum oil temperature reaches 80 ° C, the pointer of the operating oil flow indicator stops again during operation, the submersible pump fails during operation, and the thermal relay operates and outputs. When the water flow of water pipe flowmeter is less than 2.7 × 100L/min; When only one cooler is running, the transformer kuormitus on not exceed 70%, the running time shall not exceed 30 minutes under full load operation, and the running time shall not exceed 3 hours under no-load operation; During normal operation of transformer, the temperature rise of winding shall not exceed 65K, that of top oil shall not exceed 55K, that of iron core shall not exceed 80K, and that of oil tank surface shall not exceed 65K. When the transformer load exceeds the rated load, the operation time of the transformer shall be strictly controlled. When the operating load is 1.3 times of the rated load, the continuous operation time shall not exceed 120 minutes. When the operating load is 1.45 times of the rated load, the continuous operation time shall not exceed 80 minutes. When the operating load is 1.5 times of the rated load, the continuous operation time shall not exceed 45 minutes. When the operating load is 2.0 times of the rated load, The continuous operation time shall not exceed 10 minutes.