Ranking of the hottest Xuzhou epoxy resin dry-type

2022-07-24
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Xuzhou Epoxy Resin Dry-Type Transformer ranks among the domestic manufacturers

oil immersed type

1. Non closed oil immersed transformer: mainly including S8, S9, S10 and other series products, which are widely used in industrial and mining enterprises, agriculture and civil buildings

2. Closed oil immersed transformer: it mainly includes S9, S9-M, s10-m and other series products, which are mostly used in places with more oil and chemical substances in the petroleum and chemical industries

3. Sealed oil immersed transformer: it mainly includes bs9, s9-, s10-, S11 Mr, SH, sh12-m and other series products, which can be used for power distribution in industrial and mining enterprises, agriculture, civil buildings and other places

in addition, there are special transformers for various special purposes. For example, high voltage transformer for test, transformer for electric furnace, transformer for electric welding and transformer for SCR circuit, voltage transformer and current transformer for measuring instruments

patrol inspection of oil immersed transformers

patrol inspection and monitoring shall be carried out frequently for transformers in operation, so as to find abnormal phenomena or faults in time and avoid serious accidents

items to be checked and monitored generally include:

(1) whether the transformer has abnormal sound, such as uneven sound or discharge sound

(2) check whether the oil level is normal and whether there is oil leakage

(3) whether the oil temperature is normal (the upper oil temperature shall not exceed 85 ℃)

(4) whether the casing is clean and free of cracks, damages and discharge

(5) check whether the joint is heated

(6) whether the explosion-proof membrane of the explosion-proof pipe is complete

(7) whether the gas relay is leaking oil and whether the interior is full of oil

(8) whether the respirator is unblocked, whether the oil level of the oil seal respirator is normal, and whether the silica gel in the respirator is saturated with moisture

(9) whether the cooling system operates normally

(10) whether the grounding wire of the shell is intact

performance characteristics of oil immersed transformer

a. the low-voltage winding of oil immersed transformer generally adopts the cylindrical structure of copper foil winding except for the copper conductor with small capacity; The high-voltage winding adopts multi-layer cylindrical structure, so that the ampere turn distribution of the winding is balanced, the magnetic leakage is small, the mechanical strength is high, and the short-circuit resistance is strong

b. the iron core and winding are fastened respectively. The height of the device, the low-voltage lead and other fastening parts are equipped with self-locking locknuts. The non hanging core structure is adopted, which can withstand the bumping of transportation

c, the coil and iron core are vacuum dried, and the transformer oil is vacuum filtered and filled to minimize the moisture inside the transformer

d. the oil tank adopts corrugated sheet, which has breathing function to compensate for the volume change of oil caused by temperature change. Therefore, the product has no oil conservator, which obviously reduces the height of the transformer

e. since the corrugated sheet replaces the oil conservator, the transformer oil is isolated from the outside world, which effectively prevents the entry of oxygen and water from leading to the decline of insulation performance

f. according to the above five performances, the oil immersed transformer does not need to change oil during normal operation, which greatly reduces the maintenance cost of the transformer and prolongs the service life of the transformer

inspection of transformer operation and maintenance

installation problems

cause: poor installation will aggravate transformer vibration and amplify transformer noise

judgment method:

1) the transformer foundation is not firm or flat (one corner is suspended), or the bottom plate is too thin

2) if the transformer is erected with channel steel, the noise will be increased

the load flow of the solver can be expressed as! This is a half cycle sine wave method:

1) the original installation method is modified by the installation unit

2) add anti vibration rubber pad under the transformer trolley to solve some noise

impact of installation environment

cause: the operating environment affects the noise of the transformer, and the unfavorable environment increases the noise of the transformer by 3dB ~ 7dB

judgment method:

1) the transformer room is very large and empty, there is no other equipment, and there is echo. 2) The transformer is too close to the wall, less than 1m. The transformer is placed at the corner, and the reflected noise from the wall is superimposed with the transformer noise to increase the noise

3) the original oil transformer will affect the noise of transformer after changing to dry transformer. The reason is that the crude oil transformer room is narrow, and there is an oil leakage chamber and an oil leakage hole. The transformer is like a sound box

solution: some sound-absorbing materials can be properly installed indoors

inspection of transformer operation and maintenance

with the development of sensor technology

the problem of suspended potential

cause: the clamping channel steel, pressing nail bolt, pull plate and other parts of the transformer are sprayed with blue paint, and the contact of each part is not very good. Under the action of magnetic leakage field, suspended potential discharge is generated between each part to make a sound

judgment method: the suspended potential discharge makes a slight "squeak, squeak" sound, which can only be heard after careful listening. Users often mistakenly believe that the high voltage or low voltage of the transformer is discharging

solution:

1) this discharge will not affect the normal operation of the transformer

2) the paint at the place with poor contact can be scraped off during power outage maintenance, so that all parts of the transformer can be in good contact

the low-voltage line is grounded or short circuited

when the low-voltage line is grounded or out of the mechanical fatigue spring testing machine, the connecting cam of the electromechanical and reducer drives the connecting rod to move back and forth, resulting in a short-circuit accident, the transformer will make a roaring sound; The closer the short-circuit point is to the transformer, the more obvious the sound is; If the short-circuit point is close to the transformer, the transformer will make a loud and obvious sound

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