I. operation inspection measures of distribution transformers
(I) noise inspection
The distribution transformer in operation usually emits a buzzing sound, which is uniform and slight. When the sound changes, it shows that the distribution transformer has a certain fault. Therefore, in the process of routine maintenance and management of distribution transformers, checking their noise is one of the key approaches.
Inspection method is: the use of insulation rod, a section firmly to the distribution transformer, from the other end to listen to the distribution transformer noise, whether there is noise judgment, . If you hear a crackling sound, the operation process of distribution transformer, the core of the breakdown fault
(two) to conduct a comprehensive inspection of the oil level, oil temperature and oil
In the process of checking the running state of the distribution transformer, oil level, oil temperature and oil is one of the key content. In the operation of a distribution transformer, a certain amount of heat is usually emitted. If the operating current is relatively large when the flow through the coil, it will increase the heat, which will cause the oil temperature to rise continuously. Distribution transformer under normal operating conditions, the highest temperature is usually around 85 to 95 degrees Celsius, if in the actual inspection work found in the oil temperature exceeds this limit, the transformer internal heat intensified, should be timely start stop repair. In the normal operation of the distribution transformer, the oil level is usually between 1/4 and 3/4, and if the oil level is abnormal, it is likely to be caused by oil leakage.
Two, distribution transformer operation and maintenance measures
(1) proper installation of equipment for external use;
In the process of routine maintenance of the distribution transformer, the insulation cover should be reasonably installed at the low voltage end and the high voltage end, so as to strengthen the prevention of the natural disasters and the destruction of the external forces. As a result, the impact of the falling objects on the distribution transformer will be reduced, and it is difficult to cause low voltage short-circuit and burnout.
(two) reasonable installation of lightning arrester
In the process of transformer maintenance, overvoltage protection work, reasonable application to lightning arrester, lightning arrester with gapless metal oxide, as a result, the distribution transformer will not be a serious invasion of high voltage lightning wave in the process of operation, the internal insulation breakdown and short circuit can decrease the occurrence probability. The staff in the day-to-day maintenance of the distribution transformer, should be regularly carried out grounding resistance testing, welding point prohibited desoldering, thus preventing the grounding resistance exceed the standard problem.
Three, distribution transformer common fault treatment
(1) winding turn to turn short circuit
Winding turn to turn short circuit is one of the common faults in the operation of distribution transformers. In the event of a failure, the oil temperature distribution transformer will continue to rise, the black smoke emitted from the oil pillow cover, and the overall operation of distribution transformer temperature is relatively high, this will lead to the gas relay is touched. This failure is usually due to transformer water caused by the winding is immersed in water, insulation damage in welding and wire; and debris immersed into the oil passage is one of the leading causes of the fault.
(two) automatic tripping accident of distribution transformer;
Normally, the circuit breaker will be installed on the distribution transformer is high, medium and low voltage side three, so as to ensure the equipment running state in long-term stability, and protection equipment will be installed in distribution transformer. Once the automatic tripping phenomenon in transformer, this situation should be on duty to the dispatch office for quick report, and on the trip cause of judgment, at this time the staff should check the focus on the problem of fire, overload, short circuit and  injection. If there is no internal fault in the distribution transformer, then the existence of the two circuit malfunction in the protection device is the main reason for the automatic tripping of the distribution transformer.