A bolted fault in front of the relaying point will result in the current lagging the voltage by the transmission line angle (∠θLINE) for a homogeneous power system. A bolted fault behind the relaying point will result in the current leading the voltage by 180°–∠θLINE. In Fig. 8(A...
It can achieve zero-voltage switching (ZVS) for the leading switches and approximate ZCS for the lagging switches with the aid of the transformer parasitic inductance, snubber capacitors, and tapped-inductor-type smoothing filter. This converter can reduce the voltage and current spikes of the ...
Voltage regulation of transformerat lagging power factor, Voltage Regulation of Transformer for Leading Power Factor Let’s derive the expression of voltage regulation with leading current, say leading power factor of the load is cosθ2, that means angle between secondary current and voltage is θ2...
The converter is software dependent having the capability to detect the nature (leading, lagging and unity) of the power factor. In this strategy, difference in phase angles between the voltage and current waveforms has been counted by counting the interval between zero crossing instants of the ...
When loaded, the secondary currents are present and they induce losses within the transformer windings. Variations in the current of the load encourage variations in losses which ends up affecting regulation. Leading power factor increases secondary terminal voltage while the lagging power factor reduces...
By utilizing the DC blocking capacitor and adding a saturable inductor, the primary current during the freewheeling period is reduced to zero, allowing the lagging leg switches to be operated with ZCS. Meanwhile, the leading leg switches are still operated with ZVS. The new converter is ...
measured; calculated at the end of each cycle: Q= S2 – P2 ACTIVE Power Factor The magnitude of the ratio of real power to apparent power; calculated at the end of each cycle: |PF| = PACTIVE |S| Lead/Lag The voltage leading or lagging the current will be communicated as a single ...
In this paper, a zero-voltage and zero-current-switching PWM push-pull three-level converter (ZVZCS PWM PP-TL converter) is proposed, in which the voltage stress of switches is the input voltage. Phase-shifted modulation strategy is employed, the leading switches realize ZVS, and the lagging...
2. A current mode zero-voltage and zero-current switching (ZVZCS) inverter TIG welding machine is developed in this paper, which realizes ZVS for the leading leg and ZCS for the lagging leg. 研制了电流模式零电压零电流开关TIG焊机,其超前臂实现了零电压开关,滞后臂实现了零电流开关。 3. Phase -...
It is proved that the output current on α phase and β phase is not orthogonal and the amplitude values are not equal. There is the difference of leading phase and lagging phase in the output voltage loss关键词: Balancing transformer Leakage impedance Output current Orthogonality ...