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This document contains three problems related to calculating parameters of power supplies using rectifiers and inductive filters. Problem 1 involves calculating values for a single-phase rectifier supplying 135V and 20A DC. Problem 2 involves a 3-phase bridge rectifier supplying 360kW at 240V DC. Problem 3 gives specifications for a 3-phase, 6-pulse rectifier supplying 750A to a DC load and calculates associated values.

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155 views2 pages

PE

This document contains three problems related to calculating parameters of power supplies using rectifiers and inductive filters. Problem 1 involves calculating values for a single-phase rectifier supplying 135V and 20A DC. Problem 2 involves a 3-phase bridge rectifier supplying 360kW at 240V DC. Problem 3 gives specifications for a 3-phase, 6-pulse rectifier supplying 750A to a DC load and calculates associated values.

Uploaded by

SattishZee
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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(a) We wish to build a 135V, 20A dc power supply using a single-phase rectifier and an

inductive filter. The peak-to-peak current ripple should be about 10%. If a 60Hz ac
source is available, calculate the following:
i.

The effective value of the ac supply voltage

ii.

The energy stored in the inductor

iii.

The inductance of the inductor

iv.

The peak-to-peak current ripple

(b) A 3-phase bridge rectifier has to supply power to a 360kW, 240V dc load. If a 66V, 3phase, 60Hz feeder is available, calculate the following:
i.

Voltage rating of the 3-phase transformer

ii.

DC current per diode

iii.

PIV across each diode

iv.

Peak-to-peak ripple in the output voltage and its fundamental frequency

v.

Inductance of the smoothing choke (inductor) required if the peak-to-peak ripple


in the current is not to exceed 5%

(c) The line voltage is 240 V, 60 Hz on the secondary side of the transformer in Figure 1.
The dc load draws a current of 750 A.

Figure 1: Three-phase, 6-pulse rectifier with inductive filter

Calculate:
i.

The dc voltage produced by the rectifier.

ii.

The active power supplied by the 3-phase transformer.

iii.

The peak current in each diode.

iv.

The effective value of the load resistance.

v.

The peak-to-peak voltage ripple across the inductor EKA.

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