The long-term overload of power transformer will slowly cause the scalding and insulation aging of solenoid coil， two-color short circuit or short circuit on the ground， resulting in the ignition of power transformer. Therefore， the insulation compressive strength of power transformer shall be tested before installation and operation， and overload is not allowed in the whole process of operation.
What about oil immersed transformer fire?
IsariThe dry-type transformer used for power plant voltage transformation is different from the oil transformer. It is strictly prohibited to lead the way at the bottom voltage side to prevent the insulation layer of the dry-type transformer from penetrating due to overvoltage caused by overvoltage at the power grid side or lightning stroke on the line.
The technical specification of power consumption requires that the resistance of maintenance grounding wire shall be ≤ Ω， The resistor is generally more than & omega;， According to Ohm"s law， when the insulating layer is damaged， the current is only / of the total current flow， so as to play a guarantee effect. The higher the voltage， the smaller the resistance， in other words， while oil transformer has better load working capacity.
In terms of the place of use， dry-type transformers are mostly used in & ldquo; Fireproof and explosion-proof type & rdquo; It is easy to use in large and medium-sized engineering buildings and multi-storey buildings; The oil immersed transformer because of & ldquo; Accident & rdquo; There is likely to be oil or leakage after fire， and most application places leading to fire accidents are easy to choose in large and medium-sized engineering buildings and multi-storey buildings;
If the volume of power transformer is too small， the rated capacity of the transformer should be selected according to the power consumption， which is not suitable for too large or too small.
Therefore， in the operation prevention and regulation of relay protection dry-type transformer， it is necessary to find the short-circuit fault point according to the fault situation lock the fault point， and analyze the short-circuit fault types of relay protection dry-type transformer. At the same time， if all fields are clear， disconnect the switching power supply at the fault point， the maintenance work of employees will be carried out smoothly， and the harm will not expand to a greater extent.
The secondary inductive equipment of the distribution station (such as transformer voltage transformer， automobile relay， AC， etc.) operates normally. According to the AC current，IsariOutdoor energy-saving oil immersed transformer， buzz & rdquo; Sound. The operation staff of the transformer manufacturer should understand and grasp the characteristics of the noise. When the equipment has common faults， there will be noise and even & ldquo; Crackle & rdquo; The charging and discharging sound can distinguish the generation and characteristics of common equipment faults according to the music law and sound transformation when everything is normal and abnormal.
When the whole process of winding wave of oil immersed transformer is calculated by using the marking method， the winding of oil immersed transformer is generally divided into multiple modules，IsariIs there a transformer in the distribution room， and each module is replaced by an equivalent circuit， and its power circuit includes an inductance and vertical capacitance， a capacitance to ground or capacitance between windings， They also have mutual inductors between the inductors of each module， and collect the chain Internet as the equivalent power circuit of oil immersed transformer. The precision of the conclusion can completely meet the needs of practical projects.
Discount(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.
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.
Dry type transformer oscillation is solved by applying vibration damping platform to dry-type transformer and carrying out low-frequency vibration reduction management， which can control the oscillation below .%， and then reduce the building structure noise transmitted by dry-type transformer oscillation.
Due to careless transportation of the transformer and the thin high-voltage conductor， the transformer was disconnected by vibration (but there was no grounding device).
Let"s seeCommon problems of tap changer of power transformer
After the power transformer has been used for a long time， common faults of iron core will occur. Don"t worry. Contact the transformer manufacturer， and the manufacturer will assign professional technicians for inspection. The main reasons are as follows:
Dry type transformer factory
IsariOverload or short circuit occurs inside the power transformer. Flammable insulating raw materials are endangered by high temperature and electric isolation， which dissolve and ignite， resulting in a lot of steam bodies， greatly increasing the internal working pressure of the power transformer， causing the ignition of the casing， causing large-scale power failure， endangering all normal production， manufacturing and activities. There are three reasons for fire accidents in the operation of power transformers.
Fault judgment of power transformer
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).