The hottest manufacturer of Jiangsu dry-type trans

Jiangsu dry-type transformer manufacturer

ordinary oil immersed transformer has the following characteristics:

(1) low loss and remarkable energy-saving effect: the winding is wound with oxygen free copper wire; The iron core adopts three-level full inclined joints, which is manufactured by Jiangsu dry-type transformer manufacturer_ Pengcheng electric, paint and bond to reduce no-load loss

(2) with advanced winding structure and special winding end face support, the product has high insulation strength and short-circuit resistance

(3) adopt effective axial compression, special lifting plates, new fasteners and advanced process measures, Jiangsu dry-type transformer manufacturer_ Pengcheng electric ensures the fastening of the body and the firm and reliable connection with the oil tank

(4) adopt vacuum oiling process to further strengthen the insulation strength of products

(5) when the product is transported to the installation site, there is no need to check the hanging core, which saves the installation time

amorphous alloy oil immersed transformer, Jiangsu dry-type transformer manufacturer_ Pengcheng Electric has the following characteristics:

(1) amorphous alloy iron core is adopted, and the no-load loss is very small; Taking amorphous SH15 series as an example, with the same capacity, the no-load loss of this series of products can be only about 25% of that of ordinary S11 series products for all kinds of plywood, particleboard, medium density fiberboard and decorative wood-based panels

(2) it also has other advantages of the above ordinary oil immersed transformer

inspection of transformer operation and maintenance

self resonance of transformer core

cause: there is electromagnetic attraction caused by magnetic leakage between the joints of silicon steel sheets and laminations

judgment method:

1) the transformer noise is too large, and the normal noise is mixed with other noises

2) transformer noise is wavy

solution:

1) tighten the screws on the transformer, including the screws at the two ends of the clamp, the threading screws, and the cushion block pressing screws

2) add an anti vibration rubber pad under the transformer trolley to solve part of the noise

transformer coil self resonance

cause: when there is load current passing through the winding, the magnetic leakage generated by the load current causes the vibration of the winding

judgment method:

1) the transformer noise is too large and the noise is relatively low

2) when the load of the transformer reaches a certain level, noise begins to appear, sometimes it appears, sometimes it doesn't

solution:

1) tighten all the screws of the cushion block to increase the axial compression force of the coil

2) loosen all the pressing screws of the cushion block, loosen all the bolts on the outgoing copper bar and the zero line copper bar, shake the low-voltage coil, translate the high-voltage coil - the measuring system of material deformation is 3 ~ 5mm, and then tighten all the bolts

normal operation mode of transformer

① rated operation mode. Under the specified cooling conditions, the transformer can operate according to the nameplate specifications. The allowable temperature of oil immersed transformer during operation shall be checked according to the upper oil temperature. The upper oil temperature shall comply with the regulations of the manufacturer, but the maximum temperature shall not exceed 95 ℃. In order to prevent the transformer oil from deteriorating too fast, the upper oil temperature should not often exceed 85 ℃

the applied voltage of the transformer shall generally not exceed 105% of the rated value. At this time, the secondary side of the transformer can carry the rated current. In some cases, after testing or with the consent of the manufacturer, the applied voltage can be 110% of the rated voltage

② overload is allowed. The transformer can operate under normal overload or accident overload. Normal overload can be used frequently, and its allowable value is determined according to the load curve of the transformer, cooling conditions and the load carried by the transformer before overload. Accident overload is only allowed to be used under accident conditions (transformers that can still operate)

the allowable value of accident overload shall comply with the regulations of the manufacturer; If there is no manufacturer's regulation, the self cooling oil immersed transformer can be operated according to the requirements in the following table

advantages and disadvantages of dry-type and oil immersed transformers

in terms of cost, dry-type transformers are more expensive than oil immersed transformers. In terms of capacity, the capacity of oil immersed transformer must be obtained at high temperature due to the emission spectrum, which is larger than that of dry-type transformer. Dry type transformers are required in underground floors, floors and crowded places. Oil immersed transformers are used in independent substations. Box type substation generally uses dry-type transformer. When the space is large, the oil immersed transformer is used, and when the space is crowded, the oil immersed transformer is used. When the regional climate is humid, use oil immersed transformer. Dry type transformers are used in places that need "fire and explosion prevention". The capacity of dry-type transformer to bear load is worse than that of oil immersed transformer. Dry type transformers shall operate at rated capacity. The oil immersed transformer allows short-term overload

patrol inspection of oil immersed transformers

patrol inspection and monitoring should be carried out frequently for transformers in operation, so as to find abnormal phenomena or faults in time, and avoid comparing their corresponding melting action, tox, OIT with the reference value of the brand new plastic bottle to avoid serious accidents

items that should be checked and monitored generally include:

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

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

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

(4) whether the casing is clean and whether there are cracks, damages, discharges and other phenomena

(5) whether the joint is heated

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

(7) whether the gas relay leaks 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 silicone in the respirator is saturated with moisture

(9) whether the cooling system operates normally

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