What is saturation in DC generator?

Magnetization curve of a DC generator has great importance because it represents the saturation of the magnetic circuit. Above a certain point (point C in this curve) the nu-magnetized molecules become very fewer and it became very difficult to further increase in pole flux. This point is called saturation point.

Why is saturation required for a self excited generator?

Due to flow of small current in the coil, an increase in magnetic field occurs. But, after at certain level, field poles get saturated, and at that point electric equilibrium is reached, and no further increase in armature emf and increase in current.

Why does the saturation curve of a DC generator starts from some value than zero?

Electrical Question 3: Why Saturation Curve for the DC Generator does not start with zero? This curve starts from a point which is slightly higher than the origin representing that there is some flux produced by the field poles even no current is passed through the field windings.

What is the saturation error?

The saturation error is a function of the width of the RBFs relative to the grid spacing . It is therefore convenient to examine what happens as , the number of interpolation points, is varied while is fixed. This is labeled the “stationary approximation” in Fasshauer [14].

Why dc generators are losing their residual magnetism?

This is also done for the first time operation of a new generator. Loss of residual magnetism occurs, when self exited generator, is not used for long time, due to adgeing or wrong connection(polarity (+/-)) of field winding.

What is saturation in a DC motor?

Magnetic saturation’s meaning is simply that increasing an external magnetic field can no longer increase the magnetization of your material. Increasing the part’s density can increase the saturation flux density, eliminating the need for an additional component. Voila!

What are the causes of failure to excite self excited generator?

What are the causes of failure to excite self excited generator?

• When magnetism is absent.
• When the field circuit resistance is more than the cv(critical value).

What is the necessity of residual magnetism in a self excited DC generator?

Answer: A self-excited shunt generator has the field coils and the field rheostat shunted across the armature connection . lf there is residual magnetism left in the field iron, then spinning the armature will produce residual voltage . This residual voltage is normally enough to begin the generation process.