Transformer Power Supply Design Calculations

Stepping down voltage first step is is scale down the voltage by a step down transformer a step down transformer converts the 220 ac voltage to the lower ac voltage.

Transformer power supply design calculations.

A 50 kva single phase transformer has a 4000 v primary side and a 400 v secondary side. Power system and equipment design calculations in plants. Maximum people thinks that a transformer give dc output voltage because we don t get shock by touching its output wire but this is totally wrong. Primary full load current i 1 50 1000.

A v 1 4000 v v 2 400 v transformer rating 50 kva v 1 i 1 v 2 i 2. Top oil temperature rise 50k average. The initial design load connected to a transformer shall not exceed the following values of temperature rise according to iec 60076 2 reference ambient temperature 50 c. The transformer secondary rated current should be 1 8 times the dc current of the power supply.

A dual complementary rectifier is used to supply a positive and negative dc output of the same voltage. Power supply block diagram. Transformer calculator example problem. The most common method is the use of a step down transformer to reduce 230v ac to a lower value ac.

Designing an improved capacitive power supply circuit with zero crossing detection. A 50 kva single phase transformer has a 4000 v primary and a 400 v secondary. The 275v mov metal oxide varistor will protect from power supply spikes or surges. Referring to the diagram the various components involved are assigned with the following specific functions.

This is then rectified and made ripple free by using a transformerless power supply. I know this will be expensive for the capacitors but this is only for testing purposes. Assuming an ideal transformer determine a the primary and secondary full load currents b the transformer turns ratio. In a real transformer due to losses the power at the secondary coil will always be smaller than the power at the primary coil.

Uninterruptable power supply capacities. The 200ma fuse will protect the circuit from mains during shot circuit or component failures. Analyzing a capactive power supply. Now clear a doubt.

Assuming an ideal transformer determine. Transformerless capacitor power supply 12v 40ma. This is my zero crossing surge protected capacitive power supply design with voltage stabilizer i will try to list all of my doubts. The x rated capacitor c1 is the core part of this power supply as it will drop the excess mains voltage across it.