Rectifier transformers are widely used in various industries, mainly divided into lighting, machine tools and electrical appliances, mechanical and electronic equipment, medical equipment, rectifier and so on. Product performance can meet the various special requirements of users. Electrochemical industry is the application of rectifier transformer most industries, electrolysis of non-ferrous metal compounds to produce aluminum, magnesium, copper and other metals; electrolysis of salt to produce chlor-alkali; electrolysis of water to produce hydrogen and oxygen. Phase shifting method is the secondary side of the two windings using the amount, angle coupling, can make the rectifier furnace pulse wave number doubled.
For high-power rectifier equipment, the need for the number of pulse wave is also more, the number of pulse wave for 18, 24, 36 and so on the application of the increasing number of applications, which must be set in the primary side of the rectifier transformer phase-shifting winding to phase shift. There are three types of phase shifting windings coupled to the main winding, namely zigzag, hexagonal and delayed triangular.
Rectifier transformers used in the electrochemical industry have a much wider regulating range than furnace transformers. For chemical salt electrolysis, the regulating range of rectifier transformers is usually 56% - 105%, and for aluminum electrolysis, the regulating range is usually 5% - 105%. Commonly used regulators such as furnace transformers have variable flux regulation, series transformer regulation and autotransformer regulation. In addition, due to the characteristics of the rectifier element, the valve side of the rectifier can be directly controlled in the rectifier furnace silicon rectifier element conduction phase angle, can be smoothly adjusted to the average value of the rectifier voltage, this regulator is known as phase-controlled voltage regulation. Realization of phase-controlled voltage regulation, one is the use of crystal valve tube, the second is the use of self-saturated reactor, self-saturated reactor is basically composed of an iron core and two windings, one is the work winding, which is connected in series between the secondary winding of the rectifier transformer and the rectifier, the flow of current through the load; the other is the DC control winding, is provided by the other DC power DC current, the main principle of the use of ferromagnetic materials, non-linear changes in the work winding, so that the rectifier voltage can be adjusted smoothly, this is called phase-controlled regulation. The main principle is to use the ferromagnetic material nonlinear changes, so that the working winding reactance value has a great change. By adjusting the DC control current, the phase control angle α can be adjusted, thus adjusting the average value of rectified voltage. (1) Stable electrical performance: the product combines the load characteristics and grid voltage fluctuation, atmospheric over-voltage, according to the load condition of the rectifier transformer, to determine a reasonable and reliable insulation level and insulation model, to fully ensure the product's electrical performance is reliable and stable. Product environmental safety coefficient ≥ 1.67.
(2) high degree of dynamic stability: the product winding has high mechanical strength, with strong anti-surge ability to meet the extremely harsh load environment. In the design, manufacturing process better eliminate the transformer leakage caused by magnetic or non-normal transportation may cause the source of dynamic instability. The product has high dynamic stability. High impedance, 30% higher than the impedance of power transformers of the same capacity to suppress di/dt and effectively protect rectifier components.
(3) good thermal stability: advanced product design, strict control of the product's heating parts and the hottest spot temperature rise, and leave a sufficient temperature rise margin, if necessary, can be added to the coil in the axial oil channel, according to the value of the coil load loss selection of the cooling method and reasonable distribution of oil flow, to achieve the best cooling effect, the main temperature rise indicators are lower than the national standard at least 5 ℃. Coils and leads are made of copper wire, and the current density is selected to be lower.
(4) strong overload capacity: the product has a strong overload capacity and overvoltage capacity, can be in the rated load for long-term safe operation, can be in the 110% overvoltage case full load long-term safe operation (ambient temperature 40 ℃); transformer and motor connected to the terminals can withstand 1.5 times the rated current, 5S. product design, manufacturing, fully consider the characteristics of the load from the temperature rise, insulation performance and accessories selection. The product design and manufacture fully consider the load characteristics, from temperature rise, insulation performance and accessories to meet the overload requirements.
(5) superior performance indicators: no-load current design, manufacturing value is lower than the same capacity S9 series transformer based on the value of the national standard, the full user to use the economy and reliability.
(6) power saving effect is obvious, low noise (<65dB).
(7) Simplified structure, beautiful appearance; the fuel tank to take anti-leakage design process, can eliminate the fuel tank leakage. (1)Iron core: 30Q130 high permeability silicon steel sheet, at the same time, the use of selected 3 ~ 6 step-lap core stacking step multi-stage stacking method, has reduced the no-load loss, no-load current and noise.
(2) Winding: Electromagnetic wire adopts oxygen-free copper wire with high conductivity, and the winding adopts the whole set of new technology with the structure of garden cylinder type, double-cake type and new spiral type to make the product structure more compact, and the main insulation can be guaranteed effectively, and the first and last layers are strengthened to improve the insulation performance. The outer surface of the winding is wound with high-strength tightening tape, which improves the mechanical strength of the winding and makes the product's impact resistance and short-circuit resistance greatly improved.
(3) Body: The insulating pads of the body are supported by high-strength laminated wood and laminated cardboard, so that the support area of the winding end reaches more than 95%, which further improves the short-circuit resistance of the product and the operational reliability of the product. The connection between the body and the lid adopts a buffer structure with a dull plate, which overcomes the phenomenon of "overhanging" and "top cover" of the body. Insulation materials are wrapped with high-strength and high-density cable paper, and the permissible pressure should be 45Mpa.
(4) Fuel tank: the fuel tank adopts heat dissipation oil pipe (double-row and triple-row oil pipe adopts inserted piece), or adopts ladder piece radiator, which increases heat dissipation capacity under the same wall area; the calculation can also be installed according to the user's requirements for the installation of the piece radiator or the use of corrugated oil tank, and strong oil air-cooled or strong oil water-cooled radiator. Or strong oil water-cooled radiator. Tank surface treatment: transformer shell paint using "three-proof paint" (anti-salt spray, anti-moisture and heat, anti-mildew), this paint and primer adhesion, decorative, film oil resistance, corrosion resistance, light retention, color retention is better, have good leveling and covering power. Rectifier transformer microcomputer protection device is composed of high integration, bus not out of the chip microcontroller, high-precision current and voltage transformer, high insulation strength export intermediate relay, high reliable switching power supply module and other components. It is used for measurement, control, protection, communication for the integration of a kind of economic protection.
The advantages of rectifier transformer microcomputer protection device
1, can meet the inventory preparation of more than twenty kinds of protection, to meet the user on different electrical equipment or line protection requirements.
2, can be used in accordance with the needs of the actual operation of the preparation of the corresponding protection, the real realization of the user "customized".
3, custom protection function, can realize the standard protection library does not provide special protection, to maximize the user requirements.
4, a variety of protection functions are relatively independent, the protection value, realization, blocking conditions and protection can be independently adjusted and formulated.
5. The realization of protection function does not depend on communication network, which meets the reliability of power system protection.
Rectifier transformer microcomputer protection device with inlet protection, emergence protection, segmentation protection, distribution transformer protection, motor protection, capacitor protection, main transformer backup protection, generator backup protection, PT monitoring protection and other protection functions.