Method and process of taking oil sample of power transformer
The project cost is different. Compared with the purchase price of capacity transformer， the purchase price of dry-type transformer is much higher than that of oil immersed transformer.
AkabadiTwo point grounding device of iron core caused by residual welding scar;
When we apply oil immersed transformer， we all know that it works with the help of oil. What if the oil immersed transformer is on fire? What countermeasures should we do?
DalianThe 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， 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.
The zero line is mainly used in the working circuit. The voltage caused by the zero line is equivalent to the line resistance multiplied by the current of the working circuit. Because of the distance， the voltage caused by the zero line can not be ignored. As a countermeasure to maintain life safety， but only as a maintenance line. Use the affirmation of the earth & ldquo; ” Voltage. When the machine and equipment casing is electrified， the current will be quickly grounded. Even if there is a lead for the PE line，AkabadiHow much is 250kVA transformer box type， it will be grounded from the surrounding grounding body.
The noise of dry-type transformer belongs to low-frequency noise. In a small area， most of it is scattered according to the building structure. This kind of low-frequency noise is scattered to the household house according to the house building， and then causes gas vibration noise，AkabadiLoss table of distribution transformer， which is then scattered to the ears of consumers. Although the amount of noise is not very large，AkabadiOil immersed transformer class， the dispersion spacing and adverse effects are very large.
Principle of step-up dry-type transformer: the step-up dry-type transformer is a component that correspondingly converts low communication AC voltage， large current flow and small characteristic impedance into high communication AC voltage， small current and large characteristic impedance. When there is an AC circuit in the original coil， the communication AC magnetic flux will be caused in the transformer core (or magnetic core)， causing the magnetic induction voltage in the primary coil (or current).
& 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.
middlemanPower transformer factory
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， the purchase price of dry-type transformer is much higher than that of oil immersed transformer.
The switching power supply lacks one phase of power;
resourcesAfter the test， connect the data signal contact of the automobile relay with the alarm circuit， the pull-in contact with the opening circuit， and adjust the overcurrent protection value.
When the output power P of the transformer is equivalent to the input power P， the efficiency & ETA; Equivalent， the transformer will not cause loss. But in fact， there is no such transformer. The electromagnetic energy of transformer always causes loss. The key of this kind of loss is copper loss and iron loss. Copper loss refers to the loss caused by the number of turns of transformer coil. When the current has a fever according to the number of turns of the coil， part of the electromagnetic energy changes into energy and is lost. Because the electromagnetic coil is generally wound by copper core wire with insulating layer， it is called copper loss.
How to reduce the failure of dry-type transformer?
AkabadiPower transformer
For example， in the s， the radio programs applied by every family in the countryside had a ground wire and they were often wet with tap water. Protective grounding is to bury the copper plate of metal electrical conductor in the soil layer， and then lead a point of it out of the road with transmission line which completes the grounding protection. The grounding wire specifies the grounding wire resistance ≤ Ω. Grounding protection is a safeguard measure adopted to avoid safety accidents when using household appliances， office and other electrical equipment.
A specific part of dry-type transformer is the hanging core of dry-type transformer. The hanging core of dry-type transformer is a vital component. How to carry out the hanging core?
