The insulation distance between the winding and the iron yoke of power transformer is much larger than that between the windings， because the electric field between the winding and the iron yoke is far away and not as symmetrical as that between the windings. In the electric field in the middle of the winding most of the cables are in phase with the insulating cylinder (plate) in the middle of the winding， that is， the disconnection component of the electric field is small.
In fact， ground wire is not only a kind of grounding protection. The following describes in detail that ground wire is the general name of grounding system. Ground wire is divided into protective grounding and safety factor grounding device. Among them， safety factor grounding device can be divided into grounding protection， anti electric shock grounding device and anti electromagnetic wave radiation grounding device. Protective grounding is to use it for loop to make the facilities achieve the grounding wire specified by the function.
ManausPower saving analysis of transformers has always been based on whether the utilization rate of transformer capacity is less than a certain standard value. Whether transformers are environmental protection and energy saving specifications. In fact， sometimes such specifications are not saving electromagnetic energy but consuming electromagnetic energy.
What is the wavelength of oil immersed transformer?
semey The conductor insulation of power transformer is the main part of internal insulation. Some conductors should pass through the middle of electromagnetic coil， or between electromagnetic coil， iron yoke clamp and automobile oil tank wall. Therefore， it is necessary to ensure that this kind of conductor has sufficient insulation compressive strength， i.e. insulation spacing.
Analysis of common faults of oil immersed transformer:
After sampling， it must also be changed to produce flexible connection.
Transformer manufacturers generally adopt IP protective casing，Manaus25kV power transformer， which can avoid the entry of solid dirt with a diameter of more than mm， rats， snakes， cats， birds and other animals， resulting in vicious common faults such as short-circuit fault and power failure， and provide a safe natural barrier for the energized part. If the transformer equipment must be outdoors， IP protective casing can be adopted， which can avoid being equally divided with the above IP protective effects However， IP casing will reduce the refrigeration capacity of the transformer， so pay attention to the reduction of its operating volume.
For the leakage that has already occurred， find the leakage point first， which can not be ignored. For the position with serious leakage，ManausDifference between oil immersed transformer and dry-type transformer， shovel or sharp punch can be selected. The leakage point can be riveted with special tools for metal materials. After manipulating the leakage， galvanized iron wire can be punched into the leakage or riveted with hammer. Then clean the leakage point with toluene and seal it with raw materials. Coated sand casting eyes can be sealed with raw materials immediately.
The scientific research of power transformer oil is generally carried out according to the way of sampling. What are the common sampling methods and processes?
When sampling in bulk gasoline barrels the goal of long-term treatment of leakage can be achieved.
Welcome calls According to the condition of cracks，ManausDistribution transformer structure， samples shall be selected according to % of the number of gasoline barrels， but not less than barrels. When sampling in batches of small and medium-sized pails or bottles， samples shall be taken according to % of the total number of barrels (bottles).
Equipped with a temperature controller， platinum thermistor (pt) is placed beside the embedded hole on the top of the low-voltage solenoid coil to test the winding resistance temperature rise of the transformer， stop the cooling centrifugal fan， set up common problem alarm， overtemperature alarm and overtemperature tripping effect， and provide reliable overvoltage protection machinery and equipment for the dry test transformer， so as to test the safety performance of the transformer operation.
Design brandThe insulating layer shaft and the connecting articles between the bell jar and the core shall be removed. If it is a hanging bell inspection， the oil shall be pumped into the bottom of the bell jar before the bell jar can be removed.
If the input of dry-type transformer is an alternating switching power supply， because it is DC， add a circuit in the input power supply circuit to change it into a continuously changing voltage. In that way， the alternating DC current can be obtained at the output end.
The power transformer belongs to relatively durable electrical equipment， and we can"t neglect it in daily application. The common problems of power transformer conductor， power transformer winding and power transformer tapping power switch are analyzed below:
ManausSolenoid insulation deterioration
Before and after sampling， clean the periphery of the sampling port with clean or hairless linen.
After the oil is drained， all anchor bolts of the automobile oil tank at the upper end of the detachable oil cover shall be tied with the lifting jack， and the lifting point shall be on the common earrings or bolts. If necessary， the human resources traction belt shall be used as a guide.