南阳天中电器设备有限公司

Class oil-immersed rectifier transformer
Product Overview
The three-phase and six-phase series oil-immersed rectifier transformers produced by our company adopt a new insulation structure, and the iron sheets are made of high quality. Made of high magnetic permeability cold-rolled sulfur steel sheets, the windings are made of oxygen-free copper wire, and the windings are made of cardboard tube structure, increasing the number of stays and pads, increasing the mechanical strength of the wire coil, and improving the stability of the coil , the body and the fuel tank adopt multiple positioning to ensure that the body and the fuel tank are fastened as one. This product has the characteristics of small size, low loss, low noise, strong short-circuit resistance, etc. It can save a lot of power consumption and operating costs, and social It has significant benefits and is a high-tech product promoted by the country
Using environment
Ambient temperature ℃～+℃
Altitude is less than
Air relative humidity ℅ (+℃)
The installation site must be free of corrosive gases and obvious dirt
Basic parameters
Capacity~
Voltage level
Voltage regulation range﹪No excitation voltage regulation or on-load voltage regulation
Rated frequency/
Basic principle
The principle of the rectifier transformer is the same as that of the ordinary transformer
The transformer is made based on the principle of electromagnetic induction
to convert AC voltage
Equipment voltages generally have two independent windings, primary and secondary. These two windings share an iron core. The primary winding of the voltage is connected to the AC power supply, and the alternating current flows through the windings. Magnetic potential
, so there is alternating magnetic flux in the closed iron core. The secondary winding
cuts the magnetic lines of force
, and the primary and secondary AC voltages of the same frequency can be induced in the secondary. The turns ratio of the secondary winding is equal to the voltage
For example, the primary winding of a transformer is the turns, and the secondary is the turns. The input voltage is, the output voltage that can be obtained at the secondary winding of the transformer
The transformer can have many Multiple output voltages can be obtained with just one secondary winding and tap
Basic features
A rectifier transformer that forms a rectifier device with a rectifier to obtain DC power from an AC power source
①
Rectifier Each arm is turned on in turn within one cycle, and the conduction time only accounts for a part of one cycle. Therefore, the current waveform flowing through the rectifier arm is not a sine wave, but close to an intermittent rectangular waveform. The current waveforms in the secondary winding are also non-sinusoidal. The figure shows the current waveform in the three-phase bridge/connection method. When thyristor is used for rectification, the larger the lag angle, the steeper the current fluctuation, and the more harmonic components in the current, which will increase the eddy current loss. Since the conduction time of the secondary winding only accounts for a part of one cycle, the utilization rate of the rectifier transformer is reduced. Compared with ordinary transformers, under the same conditions, the volume and weight of the rectifier transformer are larger
②
The primary and secondary power of ordinary transformers are equal (ignoring losses). The capacity of the transformer is the primary winding (or secondary winding) capacity. But for the rectifier transformer, the power of the primary and secondary windings may be equal or unequal (when the primary and secondary current waveforms are different, such as half-wave rectification, the capacity of the rectifier transformer is determined by the primary and secondary windings. The average value of the power
is called the equivalent capacity, that is, where is the apparent power of the primary side and the apparent power of the secondary side.
③
Compared with ordinary transformers, the rectifier transformer The ability to withstand short-circuit electrodynamic force must strictly meet the requirements. Therefore, how to make the product have short-circuit dynamic stability
is an important issue in design and manufacturing.
Main uses
Electrochemical industry< br/>This is the industry that uses rectifiers the most. Electrolysis of non-ferrous metal compounds
to produce aluminum, magnesium, copper and other metals. Electrolysis of table salt to produce chlor-alkali.
Electrolysis of water
to produce hydrogen and Oxygen.
Traction DC power supply
Used in mining or urban electric locomotive
DC grid. Since the valve side is connected to overhead wire
, there are many short circuit faults and the DC load
The amplitude of change is large, and electric locomotives start frequently, resulting in varying degrees of short-term overload. For this reason, the temperature rise limit and current density of this type of transformer are both lower. The impedance ratio of the corresponding electric power The transformer
is about big.
The DC power supply for transmission is mainly used to power the DC motor in electric transmission, such as the armature
and excitation
of the rolling mill.
DC The voltage of this type of rectifier transformer for power transmission is generally above and the capacity is tens of thousands of kilovolt amperes. Special attention should be paid to the AC and DC superposition of the ground insulation.
In addition, there are also DC for electroplating or electrical processing. Power supply, DC power supply for excitation, DC power supply for charging and electrostatic precipitator, etc. Reasons for use
In the chemical industry where rectifiers are most used, high-power rectifier devices also have low secondary voltages. The current is very large, so it is very large, so they are similar to electric furnace transformers in many aspects, that is, the structural characteristics mentioned above
, the rectifier transformer also has it. The biggest feature of the rectifier transformer is that the secondary current is not sinusoidal AC, due to the unidirectional conduction characteristics of the subsequent rectifier components, each phase line no longer has load current flowing at the same time but soft current conduction. The pulsating current in one direction becomes DC through the filter device, and the two sides of the rectifier transformer The secondary voltage and current are not only related to the capacity connection group, such as the commonly used three-phase bridge rectifier line, double inverse rectifier line with balanced reactor, for the same DC output voltage and current required The secondary voltage and current of the rectifier transformer are different, 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.
Due to the rectifier transformer winding The current is non-sinusoidal and contains many high-order harmonics. In order to reduce harmonic pollution to the power grid and improve the power factor, the pulse number of the rectifier equipment must be increased. This can be solved by phase shifting. The purpose of phase shifting is to create a phase shift between the voltages at the same terminals of the secondary windings of the rectifier transformer.
Phase shifting method
The simplest phase shifting method is to use two angularly connected windings on the secondary side, which can double the pulse number of the rectifier electric furnace.
For high-power rectifier equipment, a large number of pulses is required, and the number of pulses is increasing day by day. Therefore, a phase-shifting winding must be installed on the primary side of the rectifier transformer
for phase shifting. There are three ways to connect the phase-shifting winding and the main winding, namely, zigzag line hexagon and extended edge triangle
.
The voltage regulating range of rectifier transformers used in the electrochemical industry is much larger than that of electric furnace transformers
For chemical salt electrolysis, the voltage regulating range is usually, for aluminum electrolysis
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