Dongying Huayi Electrical and Mechanical special for the rectifier transformer

The basic principle of the same rectifier transformer rectifier transformers and ordinary transformer. Transformer is an AC voltage conversion device made in accordance with the principle of electromagnetic induction. First line and transformer generally have two independent secondary windings, two windings sharing a core. AC power transformer primary winding in the coil generates an alternating current flowing through the magnetic potential, so there is a closed alternating flux in the core. First, the secondary winding cutting magnetic lines, can be induced in the secondary alternating current of the same frequency. First transformer secondary winding turns ratio is equal to the voltage ratio .. As the primary winding of a transformer is 440 turns, secondary 220 turns. Primary input voltage of 220V, the secondary of the transformer can get 110V output voltage. Some of the transformer can have multiple secondary windings and taps. So you get more output voltages up. Basic Characteristics and rectifiers rectifier equipment in order to obtain energy from the AC DC rectifier ① each arm in a cycle turns conducting the on-time is only part of a cycle, so that current flows through the rectifier arm waveform is not a sine wave, and It is close to the intermittent rectangular wave; the primary and secondary windings are also non-sinusoidal current waveforms. Shown in the current waveform phase bridge Y / Y connection time. Thyristor rectifier, the lag angle greater the steepness of the current fluctuation greater the current the more harmonic components, which will increase the eddy current loss. Since the secondary winding conduction time only a portion of a cycle, so lower utilization of rectifier transformer. Compared with ordinary transformer, under the same conditions, rectifier transformer size and weight are larger. ② ordinary transformer primary and secondary side power equal (ignoring losses), is the capacity of the transformer primary winding (or vice-winding) capacity. But for rectifier transformers, power its primary and secondary windings may be equal or may vary (when the primary and secondary side current waveform is not the same, such as half-wave rectification), it is the capacity of rectifier transformer is primary, secondary apparent power on average, it called the equivalent capacity, or where S1 is the primary apparent power, S2 of the secondary apparent power. ③ Compared with ordinary transformer, the ability to withstand short-circuit power rectifier transformer must strictly comply with the requirements. Therefore, how to make products with short circuit dynamic stability, is the design, manufacture important issue. The main purpose is the application of this electrochemical industry ---- rectifier becomes most industries, non-ferrous metal compounds in electrolytic preparation of aluminum, magnesium, copper and other metals; chlor-alkali electrolysis of brine to produce taken; electrolysis of water to produce hydrogen and oxygen to take. Traction DC Power ---- DC grid for electric locomotives mine or city. Since the valve flanked by overhead lines, more short-circuit fault, the DC load variations large degree of convergence, motor vehicle often start, resulting in varying degrees of short-time overload. The temperature rise limit for this kind of transformer and current density are made low. Impedance than the corresponding power transformer about 30% larger. DC power transmission ---- mainly used for the power transmission in the DC power supply, such as a rolling mill armature and field. ---- Such HVDC voltage rectifier transformer at 110kV and above the general capacity of tens of thousands of kVA. Pay particular attention to the insulation of the AC and DC superposition problem. There are also electric plating process or DC power supply, excitation DC power supply, charging and electrostatic precipitator with DC power. Rectifier transformer applications using reason most chemical industry, power rectifier device is a secondary low voltage, current large, so large, so they change in many ways is similar to the furnace, structural features point that is previously described, rectifier transformer is also available. The greatest feature of the rectifier transformer secondary current is not sinusoidal AC, because the single conduction characteristics subsequent rectifying elements, each phase line is no longer the same time, but the load current flows pulsating current flow through the filter means softened conductive, single direction to DC rectifier transformer secondary voltage, current and capacity not only to connect the group related, such as the commonly used three-phase bridge rectifier circuit, double inverse quantization with balancing reactor rectifier circuit, for the same DC output voltage and current required rectifier transformer secondary voltage and current of not the same, so the argument rectifier transformer rectifier circuit calculation is based on the premise, the general parameters are calculated from the primary to the secondary side, the projected. Since the rectifier transformer winding contains a lot of high harmonic currents are non-sinusoidal, in order to reduce the harmonic pollution on the grid, in order to improve the power factor, the need to improve the number of pulse rectifier equipment, which can be used to solve the phase shift method. The purpose is to have a phase shift between the phase shift of the rectifier transformer secondary winding of the same name end line voltage. The easiest way to phase-shift the phase shift method is to use the amount of the secondary side, angle coupling of two windings, can make the number of pulse rectifier electric doubling. For high-power rectifier equipment, required pulse number is greater, the number of pulse applications such as 18,24,36 increasing, which must be provided in the primary phase shifting rectifier transformer winding for phase shifting. Shifting the phase winding and the main winding connection There are three ways that a zigzag line, hexagonal and Yanbian triangle. Pressure range for the electrochemical industry furnace transformer rectifier transformer ratio is much greater, for chemical salt electrolysis, voltage range is normally 55% --105% for aluminum electrolytic, the voltage range is typically 5% --105%. Commonly used methods such as furnace transformer voltage regulator as a change in magnetic flux regulator, series transformer voltage regulator and auto-regulator regulator. In addition, due to the characteristics of rectifying elements, it can directly control the phase angle silicon rectifier elements turned the valve side rectification furnace, adjusting the rectified voltage average may smooth this regulator is called phase control. Realization phase control, one uses crystal valve pipe, the second is the use of self-saturable reactor, since the saturable reactor consisting essentially of a core and two windings, one is working winding coupled in series in which two rectifier transformer between the secondary winding and a rectifier, a current flowing through the load; the other is the DC control winding is provided by the additional direct current DC power, and its main principle is to use non-linear variation of ferromagnetic material, the working winding reactance value greatly changes. Adjust the DC control current, you can adjust the phase control angle α, thereby adjusting the average rectified voltage.