Note: in the whole process of safety patrol inspection， the on-site operation and maintenance management staff must use temperature tester or thermal imager to carry out purposeful inspection on the transformer itself， significantly expanded， or there is local sound， the cause shall be found immediately and certain effective measures shall be taken. If necessary， the load can be reduced or the operation of the transformer can be stopped.
When oil samples are used， the safety and fire safety technical specifications on the spot shall be strictly implemented.
SITRAThe insulation between silicon steel sheets is damaged， resulting in overheating and melting of the iron core;
(I) the distance between the external contour of kV and below dry-type transformer and the surrounding guardrail or courtyard wall shall take into account the convenience of transportation and repair of dry-type transformer， and the distance shall not be less than m; At the angle with actual operation， a spacing of more than m shall be reserved; If metal fence is selected， the metal fence shall be grounded and a warning sign shall be hung at a prominent position.
NaranjaPower transformer
Outdoor sampling shall be carried out in sunny days or dry weather with low environmental humidity. During sampling， it is necessary to resolutely prevent the invasion of dirt such as rain， snow wind and sand.
When sampling in bulk gasoline barrels， 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).
When the new oil filled by the power transformer and the oil sample that has just been considered are used， the oil sample can be used only after sufficient standing.
When the operating oil is mixed with different types of new oil or used for oil， in addition to the accurate measurement of the cold filter point of the mixed oil it is also necessary to carry out high and low temperature test and sludge test， and observe the sludge accumulation. The accumulation cannot be accessed. The results of the operation of the mixing template are not that the original oil is very poor， so it can be managed and used in a mixed manner.
The flange surface is uneven， and the installation and processing process is wrong so that the bolts are not tightened well， resulting in oil leakage.
Product lineWhen the new oil filled by the power transformer and the oil sample that has just been considered are used， the oil sample can be used only after sufficient standing.
Power transformer manufacturer
In the electric field of the winding to the yoke， there must be a strong line breaking component， so that sliding flash charge and discharge may occur at a lower current. In order to better solve this disadvantage， the appearance of the insulating parts between the winding and the iron yoke should be the same as that of the medium horizontal plane of the winding to the iron yoke insulation as far as possible，SITRADimensions of 1600KVA oil immersed transformer， so as to reduce the electric field component intersecting with the insulating parts.
The sampling container is a colorless glass bottle with a wide mouth ground glass plug with a volume of .kg or kg. - bottles shall be collected at a time for analysis and experiment. Labels shall be attached during sampling. Pay attention to the name， source， sampling date， sampling person， although dry-type transformer has strong moisture resistance， it is generally open structure or very susceptible to moisture，SITRABid winning transformer of State Grid， especially the insulation level of dry-type transformer manufactured in China is low (lower flame retardant grade) Therefore， the dry-type transformer can obtain high stability only when the air humidity is below %. The dry-type transformer shall also be prevented from stopping operation for a long time to prevent serious damp. When the grounding resistance value is less than / V (operating voltage)， it indicates that the transformer is seriously damp， and the trial operation shall be terminated.
The vibration reduction of the grounding device sheet solves the problem of modifying the fixed hard connection between the copper sheet of the grounding device and the dry-type transformer. The original oscillation of the dry-type transformer will be transmitted to the metal in the concrete by the baffle and cause low-frequency noise. Therefore，SITRAOil immersed transformer 1250， it must also be changed to produce flexible connection.
SITRAConnection group structure of dry-type transformer
Oil leakage of cast iron parts
For kVA power engineering transformer， plastic parts are selected in the middle of iron core， clamp and electromagnetic coil to keep the electromagnetic coil in a stable clamping state to reduce noise.