1. Reasonably choose the installation location of the distribution transformer
The installation of distribution transformers must meet the requirements of the user's voltage, and try to avoid installing the distribution transformers in the barren hills, which are vulnerable to lightning strikes and away from the residential areas. This is not convenient for the maintenance personnel to maintain regularly and is not convenient for staff management. .
2. Reasonably choose the capacity of the distribution transformer
It is also very important to choose the capacity of the distribution transformer reasonably, which can not cause the overload of the distribution transformer and the waste of the big horse-drawn car. According to the user load situation, the capacity should be counted and the distribution transformer capacity should be reasonably selected. Such as: a 100kV·A distribution transformer with a power factor of 0.85, it can carry a load of 85kW.
3. Strengthen the measurement of power load
During the peak period of power load, the load of each distribution transformer should be strengthened. If necessary, increase the number of measurements. The distribution transformer with unbalanced three-phase current should be adjusted in time to prevent the neutral current from being too large and easy to blow the lead. Causes the user equipment to burn out.
4. Avoid installing a low-voltage metering box on the distribution transformer.
The low-voltage metering box installed on the distribution transformer station area of ​​the remote mountainous area should be gradually removed, and it should be changed to indoor installation as much as possible. For example, when the bureau broke out the electricity-free township in the past few years, in order to facilitate the management to prevent power loss, low-voltage mountain areas were installed. The metering box, due to long-term operation, damage to the metering box glass or the low-voltage pile head of the distribution transformer cannot be replaced in time, causing damage to the distribution transformer caused by burning of the meter due to rain or the like.
5, reasonable allocation of distribution transformer high and low voltage fuse melt
The melt distribution of the high and low voltage fuses of the distribution transformer is unreasonable, which may cause serious overload of the distribution transformer and burn out the distribution transformer. The high and low pressure melt configuration shall be followed by: a fuse body with a capacity of 100 kV·A or less and a fuse body with a rated current of 2.0 to 3.0 times; and a transformer with a capacity of 100 kV·A or more with a melt of 1.5 to 2.0 times the rated current; The low-voltage side fuse should be configured slightly larger than the rated current.
6, should not adjust the tap changer privately
Due to the difference in power load between winter and summer, the voltage level is slightly different. In order to meet the voltage demand, some rural electricians randomly adjust the tap changer without performing related tests, causing the tap changer to be out of position, causing phase-to-phase short-circuit and burnout. Electric transformer.
7, distribution transformer high and low installed insulation cover
In order to prevent natural disasters and external damage, if necessary, install high and low voltage insulation covers for the narrow roads and forest protection areas to prevent the low voltage short circuit from burning the transformer on the distribution transformer.
8. Arrest arresters should be installed on the high and low voltage sides of the distribution transformer.
Lightning arresters should be installed on the distribution transformers in the multi-mine area. If the quality of the arrester is unqualified or the fault is not replaced in time, it is easy to be attacked by lightning. During the thunderstorm season, the arrester should be sent to the repair department for testing and timely installation. It is forbidden to use unqualified products.
9. Regularly measure the grounding resistance of the distribution transformer
After long-term operation of the distribution transformer (especially the grounding lead is replaced by aluminum wire), severe oxidation occurs, the grounding resistance increases, and the buried grounding body is rusted and broken, causing the neutral point potential to shift. When lightning strikes or overvoltages It is easy to cause an accident. According to the regulations, the grounding device should meet: the grounding resistance of the distribution transformer below 100kV·A is not more than 10Ω, and the grounding resistance of the distribution transformer above 100kV·A is not more than 4Ω.
10. Strengthen daily management
Regularly patrol the line, cut down trees, prevent the branches from hitting the wires and causing a low voltage short circuit to burn the distribution transformer. The lack of daily management of the distribution transformer makes the transformer run out of oil for a long time. The end of the respirator is installed or the silica gel is not replaced in time, so that the distribution transformer is damp and easy to cause accidents. There are quality problems in the distribution transformer itself. Due to the remote installation location of the distribution transformer, some construction personnel arbitrarily put the untested distribution transformer into operation, temporarily using electricity, and burning the transformer.
11, regularly check the distribution transformer low voltage lead
It is strictly forbidden to use the wire itself to make the wire nose directly on the low-voltage pile head of the distribution transformer. It is necessary to regularly check and strengthen the joint between the lead wire and the distribution transformer pile head to prevent the low-voltage pile head of the distribution transformer from being burnt due to loosening.
In order to make the distribution transformer operate safely for a long time, and there is less failure, as the operation management personnel, it is necessary to do diligent inspection, diligent maintenance, and diligent measurement, timely find problems and deal with them in time to avoid the failure to expand and burn the distribution transformer.
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