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A single-phase, three-winding converter transformer. The converter transformers step up the voltage of the AC supply network. Using a star-to-delta or "wye-delta" connection of the transformer windings, the converter can operate with 12 pulses for each cycle in the AC supply, which eliminates numerous harmonic current components. The insulation ...
An enhancement of the six-pulse bridge arrangement uses 12 valves in a twelve-pulse bridge. [11] A twelve-pulse bridge is effectively two six-pulse bridges connected in series on the DC side and arranged with a phase displacement between their respective AC supplies so that some of the harmonic voltages and currents are cancelled.
CCV operation creates current and voltage harmonics on the CCV's input and output. AC line harmonics are created on CCV's input accordance to the equation, f h = f 1 (kq±1) ± 6nf o, [9] where f h = harmonic frequency imposed on the AC line; k and n = integers; q = pulse number (6, 12 . . .) f o = output frequency of the CCV
IEC 61378 Converter transformers; IEC 61386 Conduit systems for cable management; IEC TS 61390 Ultrasonics – Real-time pulse-echo systems – Test procedures to determine performance specifications; IEC 61391 Ultrasonics – Pulse-echo scanners; IEC 61394 Overhead lines – Requirements for greases for aluminium, aluminium alloy and steel ...
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It uses a high-frequency isolated DC-to-DC converter cascaded with a controllable full-bridge inverter that creates a small bipolar voltage in series with the line. The controller can control the power and compensate for accumulated voltage drop in a distribution line.
PWM rectifier (Pulse-width modulation rectifier) is an AC to DC power converter, that is implemented using forced commutated power electronic semiconductor switches. Conventional PWM converters are used for wind turbines that have a permanent-magnet alternator. [1] Today, insulated gate bipolar transistors are typical switching devices.