The insulating layer in the middle of the silicon steel plate is aging， the anchor bolt cover with the iron core is damaged， the iron core causes large vortex， resulting in heat， temperature rise， and the aging of the insulating layer is accelerated. The core insulation compressive strength of power transformer must be measured on time and accurately. If it is found that the insulation compressive strength is less than the index value， please remove and replace the anchor bolt cover or carry out insulation for the copper core cable.
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.
AkabadiMany people probably don"t know much about the power distribution transformer manufacturers. In fact， the transformer can be plugged in for trial operation after careful inspection before capital investment. During the trial operation period， you must pay attention to the following points. Whether there is abnormal sound， noise and vibration， we should also pay attention to the following aspects.
Due to poor sealing，AkabadiRecycling of old box transformer， generally，AkabadiSupplied by dry-type transformer manufacturer， the sealing of box edge and machine cover is sealed with acid-base resistant rubber rod or rubber plate. If the joint is not solved well it will lead to common faults of oil leakage.
Salian& ldquo; of wiring transformer; Enter & rdquo; And & ldquo; Output & rdquo; Use a megger to test the grounding resistance between the terminal and the ground wire. When accurately measured by V megger， the resistance value exceeds m ohm bus.
When oil samples are used， the safety and fire safety technical specifications on the spot shall be strictly implemented.
The hanging core of dry-type transformer is a vital part
Different diversion methods， dry-type transformers mostly use silica gel waterproof casing， while oil transformers mostly use porcelain waterproof casing;
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，AkabadiOil immersed transformer monitoring， 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.
Power transformer
Test resultsAvoid aging and damage of power transformer iron core insulation: aging of iron core insulation or damage of waterproof sleeve holding anchor bolt will cause large vortex of iron core， oil leakage is often caused. This is due to the supporting force on the surface of the pipe and the working pressure on the inner cavity when stamping the heat discharge pipe.
In the case of using dry-type transformer， customers must master the method of wiring. If there are problems in wiring， it is easy to cause common faults in application. So， what is the wiring mode of dry-type transformer?
If the oil immersed transformer is burned by the cover of the transformer， when the oil immersed transformer fails， open the lower side of the transformer and place an appropriate part. When the oil immersed transformer is on fire， the oil cannot be released to avoid the occurrence of the oil immersed transformer. At the same time use detection equipment to put out the fire immediately. In order not to expand the hazard， the fire brigade must be notified.
Safety and health& ldquo; YN， D & rdquo; in which indicates that when the working voltage phasor of the primary side line， as the minute hand， refers to the position at o"clock， the phase voltage phasor of the secondary side is at o"clock. That is， the phase voltage UAB of the secondary side lags degrees behind the working voltage uab of the primary side line (or degrees ahead).
The visual inspection method is that the staff use human eyes to observe the appearance change of the visible parts of the operating equipment to find the abnormal conditions of the equipment， such as discoloration， deformation， offset， cracking loosening， ignition smoke， oil leakage， broken strand disconnection， short-circuit fault marks， hanging of dirty things， etching and turbidity， which can be inspected according to the visual inspection method. Therefore， visual inspection is one of the common methods of equipment inspection.
Noise dispersion of dry-type transformer
AkabadiFor the installation of lightning rod， it is very easy to damage the relay protection inside and outside of dry-type transformer by lightning. If it is a serious situation， it is very easy to cause fire accidents， damage to machinery and equipment， etc.
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.
If the volume of power transformer is too small， the transformer will be overloaded for a long time and it is easy to destroy machinery and equipment. Therefore， the rated capacity of the transformer should be selected according to the power consumption， which is not suitable for too large or too small.
