Dry - type power transformer

Details ： Product structure and process characteristics
Our company in 2005 the introduction of advanced technology in Europe software, through the CAD optimization design of epoxy resin cast dry-type transformers. The core of the product is made of high-quality oriented cold-rolled silicon steel sheet material, which is manufactured by the automatic NC step-seam core automatic production line and adopts the new technology of fifth-order step-overlapping seam, which greatly improves the no-load performance of the core. Coil is made of Huntsman Epoxy resin, which is completed by vacuum casting equipment. The resin permeability of the product is good, no bubbles, and thus a small amount of partial release. High and low voltage coil in close cooperation with a strong structural strength, so as to ensure a strong anti-short circuit and anti-vibration capability. The product under normal use conditions, the service life of 30 years, in the operating life, according to normal conditions of use of the product will not change the temperature of the coil surface cracks.
product structure:
Core: dry-type transformers using high-quality iron core orientation of cold-rolled silicon steel sheet material, automatic step-by-step automatic production line of iron joints, and the use of ladder joint new technology. The magnetic circuit structure is improved and the magnetic flux density at the step joint is reduced. As the first-class equipment, high-quality silicon steel sheet and advanced technology, the core of the no-load performance greatly improved. The no-load loss, no-load current and noise level are reduced by 5 ~ 6%, 20 ~ 30% and 6% respectively compared with the conventional structure core.
Coil: Dry-type transformer coil for resin casting high-voltage coil; high-voltage coil for the segment structure, the use of Swiss Huntsman (Ciba - Jiayi) epoxy resin, advanced equipment vacuum casting. Low-voltage coil with foil structure. Advanced technology to ensure that the coil has a small amount of partial discharge, anti-short circuit ability. High-voltage coil regulation range: Un ± 5% and Un ± 2X2.5% on-load regulator. Temperature control device: a fault alarm, over-temperature alarm, over-temperature regulating gate, three-phase inspection, start and stop air-cooled devices and other functions. Cooling device: Axial fan, with low noise, uniform hair, easy to install and so on, the installation of long-term overload fan can be about 40%.

Process characteristics
1, the transformer noise source from the core, the company applies automatic step ladder joint automatic core production line, using Step-Lap new technology to improve the magnetic circuit within the core distribution, with its unique advantages of equipment, reducing the product's noise.
2, product design, the use of CAD optimization means, the choice of high-quality silicon steel sheet, take a lower density so that it away from the saturation point, making the core of the harmonic volume decreases, reducing noise.
3, all the clamping parts are made of silicone rubber and elastic components of the buffer to reduce the amplitude, reduce noise, while coating the core surface of a certain thickness of the resin, played a role in sound insulation.
4, the Department of small volume, high electrical strength, high-quality resin and glass fiber composed of solid insulation with high electrical strength (breakdown voltage of not less than 34kV / mm), partial discharge is small, can be controlled within ≤ 10pc range.
5, flame retardant, does not pollute the environment, because the dry-type transformers used in the resin and glass fiber composite insulation material in the combustion of heat generated very small (about 6.5mJ / Kg), so the characteristics of self-extinguishing flame.
6, anti-moisture, 100% humidity in the safe operation of dry-type transformer core coated with resin, the coil is all resin encapsulation, it can be 100% relative humidity in the air under the reliable operation, and has a high anti-corrosion ability. Dry-type transformers also have a strong overload capacity, good thermal stability, small size, light weight, easy to install, maintenance-free advantages. It can be widely used in high-rise buildings, commercial centers, airports, stations, docks, subways, factories and underground power distribution stations.
 
specifications:
1, the voltage level: 10kV;
2, voltage regulator: no excitation or on-load voltage regulator;
3, the tap range: ± 5%, ± 2X2.5% or ± 3X2.5%;
4, the capacity range: 30-25000kVA;
5, the frequency: 50Hz, 60Hz;
6, single-phase, three-phase;
7, the junction group label: Yyno or Dyn11 (or according to user requirements);
8, short-circuit impedance: in accordance with national standards or according to user requirements;
9, the use of the environment: relative humidity of 100%, the ambient temperature is not higher than 40 ℃ (or according to user requirements);
10, the cooling method: AN or AF;
11, protection class: IP00, IP20, IP23;
12, insulation heat class: F-class;
13, the insulation level: frequency voltage 35kV, 75kV impulse withstand voltage,