35KV-110KV oil-immersed power transformer

Product/performance characteristics

The product has the characteristics of low loss, low noise, anti-leakage, no lifting core and so on. Its safety, reliability, economy and other aspects have extraordinary innovation, so that it has become a domestic first-class technology products. The product mainly has the following characteristics:
Transformer core: The core adopts multi-step lap process, the lamination is 45 degree oblique joint without holes binding structure, the silicon steel sheet adopts advanced longitudinal and transverse shear line material, the shear burr is not more than 0.02mm. In addition, the advanced core stacking table, strict stacking and non-prestacking iron yoke technology, fully ensure the grain orientation of the core silicon steel sheet. The no-load loss of the transformer is effectively reduced. The iron core is bound with high strength PET polyester binding tape, and the clamp structure is plate clamp. The stray loss is reduced. Yoke clamping adopts a unique clamping and binding process to fully ensure the degree of core clamping. At the same time, the mature process over the years makes the core, pull plate, top beam, side beam, foot and so on firmly become a whole, to ensure the best stress state of the core sheet, which not only reduces the no-load loss of the transformer, but also greatly reduces the transformer noise.
Transformer winding: The high, medium, low and voltage regulating coils of the transformer are wound on the insulated paper tube, the low voltage winding mostly adopts the spiral structure with axial oil passage, and the high and medium voltage winding adopts the composite wire wrapped in high strength Denison paper imported from the United States, which greatly improves the filling coefficient of the transformer iron window and reduces the vortex and circulation loss of the wire. At the same time, it also improves the short-circuit resistance of the transformer. All windings are provided with locking stays (i.e. reinforcing stays) inside and outside. The (0) margin design is adopted for the radial tightening of the winding, which greatly enhances the mechanical strength and short-circuit resistance of the winding.
In addition, the oil guide structure is provided in the high, medium and low voltage winding, which reduces the temperature rise of the most hot spot of the winding, thus extending the service life of the transformer. For the on-load voltage regulating transformer, an independent voltage regulating winding is set to make the ampere-turns of each winding more balanced, improve stability, prevent instability deformation, effectively reduce the axial force caused by external short circuit of the transformer, and improve the dynamic stability of the transformer in the case of external failure.
Transformer body insulation: The transformer body insulation assembly and winding are completed in a fully sealed purification workshop, which meets the cleanliness requirements of the manufacturing of high voltage and ultra-high voltage transformer products and the constant temperature requirements of the body, further ensuring the cleanliness and dryness of the body. At the same time, kerosene vapor phase drying equipment is used to further ensure the cleanliness of the body. The lower plate and upper plate of the body are all made of electrician laminated wood with high mechanical degree and good electrical performance. The stays and pads used in the transformer have been closely treated and rounded many times to greatly reduce partial discharge. The steel clamp and the steel press nail have sufficient strength, the contact surface of the press bowl in contact with the press plate is designed to the maximum, and the arrangement of the support pad, brace and press nail makes the stress of the winding relatively balanced as far as possible, and improves the overall stability of the body. The whole body adopts constant pressure drying process, which shortens the assembly time of the body after winding stabilization treatment. Adjust the concentricity of each winding to make the magnetic core as consistent as possible, fully ensure that the reactance height of each coil is equal, so that the force of each winding is uniform, thus improving the anti-short circuit ability of each winding. In addition, the lower clamp and the lower oil tank are positioned with steel on all sides, and are locked through the adjustment of reverse pressure nails. The upper beam and upper tank cover are cured with epoxy resin, so the body can withstand the impact test under various transportation conditions and the axial electric power in operation without displacement.
Transformer leads: the high and medium pressure tap leads of the transformer are fixed and led to the switch with a support, and the copper bar of the low voltage lead is fixed on the upper and lower clips of the iron core, which improves the stability of the lead, and has the guarantee of the coil head bundling standard and process, which greatly reduces the local discharge of the transformer.
Transformer tank: The tank structure of medium and large transformers is bell jar type. Use large folding machine once corrugating molding, cancel a variety of reinforced iron and reinforced plate, not only greatly improve the mechanical strength of the transformer tank, but also reduce the leakage caused by the weld, increase the effective heat dissipation surface of the body, improve the heat dissipation effect; At the same time, due to the divergence effect of the corrugated box wall, the transformer noise is reduced. The sealing part of the oil tank is specially processed, and the overall "shot peening" treatment of the oil tank is carried out to completely remove the oxidation skin on the surface of the box and the sharp corner burr and welding slag generated in the processing, which improves the adhesion of the paint and makes the appearance quality both beautiful and lasting. Heat sinks and other components simulate the harsh environmental conditions of field operation to test and detect effectively ensure the removal of leakage points. All flanges are finished and equipped with slotted limit structure. At the same time, high quality acrylic rubber gaskets with oil resistance and ozone resistance are used to prevent leakage of the transformer. In addition, when the upper and lower oil tanks of the transformer are connected with bolts, the upper and lower box can also be welded along the dead seal structure according to the user's requirements.
Transformer cooling and accessory devices: generally air-cooled/self-cooled, the fan is running at full load when starting, and the fan is stopped for natural cooling, and the load is 67% of the full load. The vane radiator layout is reasonable and compact, the fan is generally hung on the radiator, and the wind is blown horizontally or vertically. The oil storage tank is generally capsule type, which is equipped with oil-resistant and airtight capsules. Fully isolated the transformer oil and air contact to achieve full seal. In addition, an expanded metal corrugated oil storage tank (internal or external oil type) made of stainless steel material can also be used. It has the characteristics of maintenance-free and reliable operation.
Our company relies on advanced technology, with the help of perfect quality assurance system, through reliable product structure design and technology, so that products always maintain low office discharge, low loss, low noise, high reliability.
Environmental conditions of use
Device type: outdoor type
Ambient temperature: maximum +40°C, minimum -30°C
Altitude: < 1000 m (> 1000 m, temperature rise needs to be corrected) Relative temperature: ^90%(25°C)
Installation site: no corrosive gas, no obvious dirt and other areas

Overload capacity/technical parameters

Technical specification
Voltage level: 35kV~110kV;
Voltage regulation mode: load regulation, no load regulation;
Rated capacity: 315~63000kVA
Frequency: 50Hz;
Phase number: 3 phases;
Link group label: according to the national standard or user requirements; Short-circuit impedance: according to national standard or user requirements; Use environment: according to national standard or user requirements; Cooling method: oil immersed self-cooling, air cooling;
Insulation level: according to national standard.