With a transformer...
Full load current ofthe motor x 0.58
delta star
What is the continuous current of 10HP star delta motor
In delta to delta there will be no ground on both primary and secondary sides. Leave the primary side but we take care on secondary side. If there any fault occurs on the secondary then there will be unbalanced voltages between the phases results in the flow of current through the secondary windings so only we are using star on the secondary side while having neutral to prevent such a current flow.
There is a problem called "neutral phase shift" in star-star transformer, if we connect unbalance load(single phase load at secondary), then the phase point is shifted towards neutral. we require sinusoidal secondary voltage at secondary, for this flux must be sinusoidal. Flux will be sinusoidal, if it contains the third harmonic component of exciting current. so third harmonic current can not flow in star-star transformer. so we use delta-star transformer,in delta , third harmonic component can flow & get sinusoidal output.
One must check the design of the transformer windings. STAR - Delta or Star to star or Delta - star or Delta Delta. Wiring must be done accordingly.
It is used in where the transformer are connected in star delta.
Yes, possible. NGR or earthing transformers are used when it is necessary to limit the fault current.
With a transformer...
With a transformer...
How to calculate current of star and delta moter with 55kw 380v 85%
Full load current ofthe motor x 0.58
delta star
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1. A three phase transformer with HV side star connected and LV side delta connected results in economical design. 2. However, if star winding is required on the LV side due to load / safety requirements, then it is common to connect the HV side as delta. See next item to know why a delta winding is necessary. 3. Delta winding provides a path for third harmonic current present in the magnetising current due to core saturation. Hence, delta winding acts a thrid harmonic filter. This will help to eliminate non-sinusoidal voltage on transformer load terminals. This is an important feature of transformer design. Hence, in practice, all transformers will invariably have a delta winding.
The voltage of a winding that is connected in star is 1 over the square root of three, 1 / 1.732, or 0.5774, of the voltage if that winding were connected in delta. This results in a star power of 1/3, or 0.3333, of the delta power.Similarly, if you know the winding current in delta, you can calculate the star current by multiplying by 1.732.This all presumes that the neutral point of the star is symmetrically centered in the middle of the phase triangle.