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Rectifier transformer

Rectifier transformers are power transformers for rectifier equipment. The characteristics of the rectifier equipment are that the primary side inputs AC, and the secondary side outputs DC after passing through the rectifying element. Most of the rectified DC power supplies used in industry are obtained from AC grids through rectifier transformers and rectifier equipment.

Description

Usage:Transformer
Phase:Single
Coil Structure:Toroidal
Work temperature:-5~+40℃
Type:Rectifier transformer
Color:blue White, other
Rated power: 50/60 (KVA)
Efficiency (η): 98%
Voltage ratio: 400/220 (V)

Definition

Rectifier transformers are power transformers for rectifier equipment. The characteristics of the rectifier equipment are that the primary side inputs AC, and the secondary side outputs DC after passing through the rectifying element. Converter is a general term for three working modes: rectification, reverse current and frequency conversion. Rectification is the most widely used one. The transformer used as the power source of the rectifier is called a rectifier transformer. Most of the rectified DC power supplies used in industry are obtained from AC grids through rectifier transformers and rectifier equipment.

Features

1.Hign mechanical strength, safe and reliable operation.

2.Low noise and small volume, friendly installation and free maintenance.

3.High insulation and low partial discharge, long life.

4.Good humidity resistance and fireproofing.

Function and role

(1) Stable electrical performance: The product determines the reasonable and reliable insulation level and insulation model according to the load condition of the rectifier transformer based on the load characteristics and grid voltage fluctuations and atmospheric overvoltage conditions, which fully guarantees that the electrical performance of the product is reliable and stable. Product environmental safety factor ≥ 1.67.

(2) High degree of dynamic stability: The windings of the product have high mechanical strength and strong anti-burst ability to meet the extremely harsh load environment. During the design and manufacturing process, the sources of dynamic instability caused by magnetic leakage of the transformer or abnormal transportation may be eliminated. The product has high dynamic stability. High impedance, 30% higher impedance than power transformers of the same capacity to suppress di / dt and effectively protect rectifier components.

(3) Good thermal stability: Advanced product design, strictly control the temperature rise of the hot parts and hottest points of the product, and leave a sufficient margin for temperature rise. If necessary, add an axial oil channel in the coil. According to the coil For the load loss value, the cooling method is selected and the oil flow is reasonably distributed to achieve the best cooling effect. The main temperature rise indicators are at least 5 ° C lower than the national standard. The coil and lead are made of copper wire, and the current density is selected to be low.

(4) Strong overload capacity: The product has strong overload capacity and over-voltage capability, can run safely for a long time under the rated load, and can run safely at full load for a long time under the condition of 110% over-voltage (ambient temperature 40 ° C); The terminal connected to the transformer and the motor can withstand 1.5 times the rated current for 5S. Product design and manufacturing fully consider the load characteristics, and meet the overload requirements from various aspects such as temperature rise, insulation performance and accessories selection.

(5) Superior performance index: The design and manufacturing value of no-load current is lower than the national standard S9 series transformers of the same capacity, which is sufficient for the economy and reliability of users.

(6) The power saving effect is obvious, and the noise is low (<65dB).

(7) The structure is simplified and the appearance is beautiful; the fuel tank adopts anti-leakage design technology to prevent fuel tank leakage.

Principle

The biggest feature of the rectifier transformer is that the secondary current is not a sinusoidal AC. Due to the unidirectional conduction characteristics of the subsequent rectifier components, the phase lines are no longer simultaneous, and the load current flows instead, but the soft current conducts. For direct current, the secondary voltage and current of the rectifier transformer are not only related to the capacity connection group, such as the commonly used three-phase bridge rectifier lines, double-reverse rectifier lines with balanced reactors, and the same DC output voltage and current required. The secondary voltage and current of the rectifier transformer are not the same, so the parameter calculation of the rectifier transformer is based on the rectifier line. Generally, the parameter calculation is calculated from the secondary side to the primary side.

Because the rectifying transformer winding current is non-sinusoidal and contains many higher harmonics, in order to reduce harmonic pollution to the power grid, in order to improve the power factor, the pulse wave number of the rectifying equipment must be increased, which can be solved by phase shifting. The purpose of phase shift is to make a phase shift between the same-named terminal line voltages of the secondary winding of the rectifier transformer.

Structure

(1) Iron core: 30Q130 high-permeability silicon steel sheet is used, and the selected 3 to 6 step-lap core stacking step multi-layer lamination method is used to reduce the no-load loss, no-load current and noise.

(2) Winding: The electromagnetic wire adopts high-conductivity oxygen-free copper wire, and the winding adopts a whole set of new processes such as cylindrical, double-pie and new spiral, which makes the product structure more compact and the main insulation can wait until it is effective. Ensure that the head and tail layers are strengthened to improve the insulation performance. Winding the outer surface of the winding with high-strength tightening tape, improves the mechanical strength of the winding, and greatly improves the product’s impact resistance and short-circuit resistance.

(3) Body: The body insulation pads are supported by high-strength laminated wood and laminated cardboard, so that the support area of ​​the end of the winding reaches more than 95%, which further improves the short-circuit resistance of the product and improves the operation of the product. reliability. The connection between the body and the box cover adopts a rigid belt buffer structure, which overcomes the phenomenon of “hanging” and “top cover” of the body. Insulation materials are wrapped with high-strength, high-density cable paper, and the allowable pressure should be 45Mpa.

(4) Fuel tank: The fuel tank adopts heat-dissipating oil pipes (double-row and three-row oil pipes use the insert method), or a stepped fin radiator, which increases the cooling capacity under the same box wall area; the calculation can also be installed according to user requirements Type radiator or corrugated oil tank, and strong oil air-cooled or strong oil water-cooled radiator. Fuel tank surface treatment: The transformer shell paint uses “three-proof paint” (anti-salt fog, anti-humidity, anti-mildew). This paint has strong adhesion to the primer, good decoration, film oil resistance, corrosion resistance, gloss retention, Good color retention, good leveling and hiding power.

Application

Widely used in lighting, machine tool appliances, mechatronics, medical equipment, rectifiers, etc. Product performance can meet various special requirements of users.

I. Electrochemical Industry
This is the industry with the most rectification. Electrolyzing non-ferrous metal compounds to produce aluminum, magnesium, copper and other metals; electrolyzing common salt to produce chlor-alkali; and electrolyzing water to produce hydrogen and oxygen.

DC power supply for traction
DC grid for mine or city electric locomotives. Because the overhead line is connected to the valve side, there are many short-circuit faults, the radiated DC load changes greatly, and the electric locomotive often starts, resulting in short-term overload of varying degrees. For this reason, the temperature rise limit and current density of these transformers have achieved low. The impedance is about 30% greater than the corresponding power transformer.

DC power supply for transmission
It is mainly used to supply DC motors in electric drives, such as armature and excitation of rolling mills.

4. For DC transmission
The voltage of this kind of rectifier transformer is generally above 110kV, and the capacity is tens of thousands of kilovolt-amperes. Pay special attention to the AC and DC superposition of the ground insulation.

In addition, there are DC power supplies for electroplating or electroprocessing, DC power supplies for excitation, DC power supplies for charging and electrostatic precipitator.

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