1. SC (B) 11 dry-type transformer product introduction:
SC (B) 11 type epoxy resin casting dry-type power transformer is the current performance index of low noise and low loss type dry-type transformer, can be used as a variety of distribution transformer replacement products, is one of the various types of dry-type transformer performance **** products.
SC (B) 11 dry-type power transformer is particularly suitable for urban power grids, high-rise buildings, business centres, theatres, hospitals, hotels, tunnels, subways, underground power stations, test chambers, stations, terminals, airports, combined substations and other important places to promote the use.
2.SC(B)11 dry-type transformer product features:
Low loss: product no-load loss than *** GB/T10228-2008 'dry-type power transformer technical parameters and requirements' reduced by more than 35%, excellent energy-saving effect, economic operation, maintenance-free.
Low noise: product noise level than the current professional standard JB/T10088-1999 '6-220KV level transformer sound level' lower than 10-15 dB or more.
Low partial discharge: the resin mixture adopts the foreign advanced mixing method and vacuum film degassing two kinds of technology, make the mixture mix uniformly and exclude the air bubbles in the mixture at the bottom. The product only has very low partial discharge, which can be controlled below 5PC.
High and low voltage coils are cast under vacuum and pressure, so that the resin insulation has both full encapsulation and layer turn-to-turn immersion cleanliness. The casting body has a dense curing structure, flame retardant, explosion-proof, and does not pollute the environment. The glass fibre and other insulating materials for winding coils have self-extinguishing characteristics, and will not produce arcs due to short circuits, and the resin will not produce toxic and harmful gases under high heat.
High mechanical strength: the resin with filler makes the expansion coefficient difference within the casting body is small, the curing shrinkage is small, the internal stress is small, the hardness of the cured material is high, in the internal and external surfaces of the epoxy resin encapsulation layer of the high and low voltage coils, there is a prefabricated reinforcing material placed in the layer, which has the same dense structure as that of the reinforced concrete, and thus the mechanical strength is greater than that of the pure epoxy resin, and it can withstand the action of the short-circuit electric force without any damage.
High electrical strength: high and low voltage coils are cast in vacuum into a fully sealed structure, with good insulation and arc resistance and moisture resistance, can withstand atmospheric over-voltage, operating over-voltage, transient over-voltage and long-term working voltage electrical strength, frequency voltage is strong type.
High heat-resistant strength: high and low voltage coils are thin epoxy resin encapsulated insulation, and the thermal conductivity is large, there is a good heat dissipation performance, the cooling method generally adopts the natural cooling of the air (AN), can also be configured with a forced air-cooling system (AF). Insulation heat-resistant grade can reach class H, the average temperature rise is allowed to rise 12.5K, the limit temperature can reach 180 ºC, has a high heat-resistant strength, service life of more than 30 years.
Small size, light weight, occupies less space, low installation cost, no need to consider the oil drainage tank, fire prevention and fire fighting facilities and standby power supply. It can be installed in the load centre in a decentralized manner, sufficiently close to the point of electricity consumption, thus reducing the cost of lines and saving the cost of expensive low-voltage facilities.
Stainless steel or aluminium alloy is used for the shell material. The protection level reaches IP20 and IP23. IP20 shell can prevent the solid foreign matter with the diameter larger than 12mm from entering, and make further safety protection to the transformer. IP23 shell can prevent the water droplets from flowing into the transformer within the angle of 60° with the vertical line, and it can be applied to the outdoor operation.
Temperature control system consists of temperature controller and PTC temperature measuring element installed in the hottest point of the product, i.e. the upper end of the low-voltage winding, to achieve the temperature measurement and control of the transformer, if the temperature of the transformer winding is too high due to overload operation or fault, the temperature controller sends out an alarm signal, and the temperature exceeds the safety value will be tripped by itself. When forced air cooling is used, the temperature controller decides to put or switch the cooling fan according to the winding temperature. Temperature display system directly displays the hot spot temperature of the winding during the operation of the transformer, which can be used in conjunction with the temperature control system.
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