Table of Contents
How do you design a transformer?
Designing a transformer using an example:
- Sec.Volt-Amps(SVA) = Vs * Is = 60 * 4.44 =266.4VA.
- Prim.Volt-Amps(PVA) = SVA / 0.9 = 296.00VA.
- Prim.Voltage (Vp) = V2 / (n2/n1) = 60/0.5= 120V.
- Prim.current (Ip) = PVA/Vp = 296.0/ 120 = 2.467A.
- Core Area(CA) = 1.15 * sqrt(PVA) = 1.15 * sqrt(296) = 19.785 cm²
What is the difference between core type and shell type transformer?
Core type transformer uses concentric cylindrical winding whereas the shell type transformer uses sandwiched winding. It is also noted that in a core type transformer, winding surrounds the core whereas, in a shell type transformer, the core surrounds the winding.
What is a transformer with diagram?
In the diagram below this is the ‘First Coil’. The winding which gives the desired output voltage due to mutual induction is commonly known as the ‘secondary winding’. A transformer that increases voltage between the primary to secondary windings is defined as a step-up transformer.
Which type of design is suitable for three-phase transformer?
Primary Circuit The two most commonly used primary circuits for three-phase transformers are the Star, or Y connection, as shown in Figure 1a, and the other being known as the Delta (A) connection, as shown in Figure 1b. The design requirement for each particular job dictates which method of connection will be used.
How do you design a transformer rating?
Since you know kVA = V * l / 1,000, we can solve for V to get V = kVA * 1,000 / l. So you’ll multiply your kVA rating by 1,000 and then divide by the amperage. If your transformer has a kVA rating of 75 and your amperage is 312.5, you’ll plug those numbers into the equation — 75 * 1,000 / 312.5 = 240 volts.
Why is Shell Type 3 phase transformer preferred than core type transformer?
Core type transformer has a low power efficiency due to less output power and high leakage flux. Shell-type transformer has high power efficiency due to high output power and low leakage flux.
What is a three phase transformer?
Three-phase transformers are a type of transformers that are used to change voltages of electrical systems with three phases. There are different types of configurations, namely: star-star, delta-delta, star-delta, and delta-star.
How do you calculate current in a 3 phase transformer?
the following figure presents a nameplate of a three phase transformer….Using the aforementioned formula, let’s confirm this rating:
- Primary Voltages or High Voltages (H.V) is 11000 volts.
- Primary Current (current on High Voltage side) is 5.25 amps.
- KVA = (√3. V x I) /1000= (1.732 × 11000 × 5.25)/1000=100 KVA.
What is the need for laminating the core of transformer?
The transformer core needs to be laminated to reduce the eddy current that has arisen from the induced voltages through the core, thereby reducing the heat loss of the entire core. Therefore the transformer core is laminated to minimize the eddy currents flowing through it.