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In a 3 phase M6 controlled converter for continuous conduction mode, each SCR conducts for __________ per cycle.
Each SCR conducts for 60° or 2π/6 radians. 6 x 60 = 360°.
In a 3 phase, 12pulse controlled converter for continuous conduction mode, each SCR conducts for __________ per cycle.
Each SCR conducts for 30° or π/6 radians. 12 x 30 = 360°.
A 3phase full converter delivers a ripple free load current of 10 A with a firing angle delay of 45°. The input voltage is 3phase, 400 V, 50 Hz. The source current is given by the following relation.
Find the fundamental component of the source current amplitude.
Put n = 1 (fundamental component) and the rest of the given values in the above given equation.
A 3phase full converter delivers a ripple free load current of 10 A with a firing angle delay of 45°. Find the DF.
DF = cosα = cos45 = 0.707
Note that ripple free current does not mean that DF = 0. It means the current is continues in magnitude and direction, current will always contain harmonics (distortions) whether it is rippled or ripple free.
What is the relationship between DF, CDF and PF?
PF (power factor) = (distortion factor) x (current distortion factor).
The commutation period when both incoming and outgoing SCRs are conducting due to source inductance is called as the
Due to source inductance, SCRs cannot start and stop conducting immediately, hence a time occurs when both incoming and outgoing SCRs are conducting together. This delay is called as commutation angle or overlap period (μ).
A 3phase full converter delivers a ripple free load current of 10 A with a firing angle delay of 45°. The input voltage is 3phase, 400 V, 50 Hz. The source current is given by the following relation.
Find the value of 2nd harmonic source current amplitutue.
2nd harmonics are absent in a 3phase full converter, it has only odd number of harmonics i.e. 3rd, 5th etc.
In a ppulse converter, each SCR conducts for (per cycle)
In a ppulse controlled converter, each device conducts for p radians. ppulse converter would have p devices. Hence, 2π/p x p = 2π = 360°.
Which of the below mentioned converter can operate in both 3pulse and 6pulse modes?
Semiconverters can operate in 6pulse modes gating the SCRs at appropriate intervals.
A M6 controlled converter or 6pulse halfwave controlled converter is obtained by using a transformer having
M6 requires a transformer having a delta connected primary and a double star connected secondary such that 6 SCRs are connected to it on the secondary side.
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