Transformer Power Supply Design Calculations

I know this will be expensive for the capacitors but this is only for testing purposes.

Transformer power supply design calculations.

A 50 kva single phase transformer has a 4000 v primary and a 400 v secondary. Top oil temperature rise 50k average. Now clear a doubt. Analyzing a capactive power supply.

This is my zero crossing surge protected capacitive power supply design with voltage stabilizer i will try to list all of my doubts. Designing an improved capacitive power supply circuit with zero crossing detection. Power supply block diagram. In a real transformer due to losses the power at the secondary coil will always be smaller than the power at the primary coil.

The transformer secondary rated current should be 1 8 times the dc current of the power supply. Before we learn the formula for calculating and optimizing resistor and capacitor values in a transformerless power supply it would be important to first summarize a standard transformerless power supply design. Primary full load current i 1 50 1000. This is then rectified and made ripple free by using a transformerless power supply.

The transformer secondary voltage should be approximately 8 times the dc voltage of the unregulated power supply. A 50 kva single phase transformer has a 4000 v primary side and a 400 v secondary side. Uninterruptable power supply capacities. Transformerless capacitor power supply 12v 40ma.

The most common method is the use of a step down transformer to reduce 230v ac to a lower value ac. The x rated capacitor c1 is the core part of this power supply as it will drop the excess mains voltage across it. A v 1 4000 v v 2 400 v transformer rating 50 kva v 1 i 1 v 2 i 2. 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.

A dual complementary rectifier is used to supply a positive and negative dc output of the same voltage. 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. Even though the transformer based power supply is efficient in providing sufficient current it consumes much space and makes the gadget bulky. Transformer calculator example problem.

The 275v mov metal oxide varistor will protect from power supply spikes or surges. Power system and equipment design calculations in plants. Assuming an ideal transformer determine a the primary and secondary full load currents b the transformer turns ratio. The 200ma fuse will protect the circuit from mains during shot circuit or component failures.