1. Noise inspection of high and low voltage switchgear:
The distribution transformer in operation usually makes a "buzzing" sound, which is uniform and slight. When the sound changes, it indicates that the distribution transformer has a certain fault. Therefore, in the process of daily maintenance and management of distribution transformer, checking its noise is one of the key ways.
The inspection method is as follows: apply an insulating pull rod, firmly push one section of it on the distribution transformer, listen to the sound from the distribution transformer from the other end, and judge whether there is noise. If the "crackle" sound is heard at this time, it indicates that the core breakdown fault occurs during the operation of the distribution transformer; If the noise heard is very heavy and loud, it indicates that the distribution transformer is in the operation state of excessive load current; If the noise tone is high and accompanied by a sharp sound, it indicates that the iron core of the distribution transformer is in an oversaturated state and the power supply voltage is relatively high.
2. Comprehensively check the oil level, oil temperature and oil color of high and low voltage switchgear:
In the process of checking the operation state of distribution transformer, oil level, oil temperature and oil color are one of the contents. During the operation of distribution transformer, it usually emits some heat. If the working current is relatively large when flowing through the coil, it will increase the calorific value, which will lead to the continuous rise of oil temperature. For the distribution transformer under normal operation, the high oil temperature is usually 85 ~ 95 ℃. If the oil temperature exceeds this limit in the actual inspection, it indicates that the internal heating of the distribution transformer is intensified, and the shutdown and repair shall be carried out in time.
The oil level of distribution transformer under normal operation is usually between 1 / 4 and 3 / 4. If the oil level is abnormal, it is likely to be caused by oil leakage. Therefore, the staff must inspect the equipment in time; The oil color of distribution transformer under normal operation is light yellow and will change to light red after a period of operation. If the color is deepened, it indicates that the equipment has oxidation and aging problems.