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Under no load, when no current flows through the secondary coils, V nl is given by the ideal model, where V S = V P *N S /N P. Looking at the equivalent circuit and neglecting the shunt components, as is a reasonable approximation, one can refer all resistance and reactance to the secondary side and clearly see that the secondary voltage at no ...
The open-circuit test, or no-load test, is one of the methods used in electrical engineering to determine the no-load impedance in the excitation branch of a transformer. The no load is represented by the open circuit, which is represented on the right side of the figure as the "hole" or incomplete part of the circuit.
An ideal transformer is linear, lossless and perfectly coupled. Perfect coupling implies infinitely high core magnetic permeability and winding inductance and zero net magnetomotive force (i.e. i p n p − i s n s = 0). [3] [c] Ideal transformer connected with source V P on primary and load impedance Z L on secondary, where 0 < Z L < ∞.
In a transformer the no-load loss is dominated by the core loss. With an amorphous core, this can be 70–80% lower than with traditional crystalline materials [citation needed]. The loss under heavy load is dominated by the resistance of the copper windings and thus called copper loss.
For an ideal transformer operating under ideal conditions, I s = I p /N, V s = N×V p. L p, primary (self-)inductance, a value determined by the number of primary turns N p squared, and an "inductance factor" A L. Self-inductance is often written as L p = A L ×N p 2 ×10 −9 henries. [1] R, combined switch and primary resistance
is the voltage at maximum load. The maximum load is the one that draws the greatest current, i.e. the lowest specified load resistance (never short circuit); is the voltage at minimum load. The minimum load is the one that draws the least current, i.e. the highest specified load resistance (possibly open circuit for some types of linear ...
The ferroresonant transformer, ferroresonant regulator or constant-voltage transformer is a type of saturating transformer used as a voltage regulator. These transformers use a tank circuit composed of a high-voltage resonant winding and a capacitor to produce a nearly constant average output voltage with a varying input current or varying load.
A conventional six-winding, grounding transformer or zigzag bank, [1] with the same winding and core quantity as a conventional three-phase transformer, can also be used in zigzag winding connection. In all cases the first coil on each zigzag winding core is connected contrariwise to the second coil on the next core.