What happens to the transmission network when it is lightly loaded?

Transmission lines supply reactive power to the system when lightly loaded but absorb reactive power when heavily loaded.

What is the effect of capacitance in transmission line?

Capacitance in a transmission line results due to the potential difference between the conductors. The conductors get charged in the same way as the parallel plates of a capacitor. Capacitance between two parallel conductors depends on the size and the spacing between the conductors.

What will happen when the characteristic impedance of a transmission line is equal to the load impedance?

Explanation: When the characteristic impedance will be same as load then the load will absorb all the energy.

What is the effect of line capacitance for lagging load?

If the capacitance of an overhead line is high, the line draws more charging current, which compensates or cancels the lagging component (reactive component) of load current (under normal load conditions the load is inductive one). Hence the resultant current flowing in the line is reduced.

What is short transmission line?

A short transmission line is defined as a transmission line with an effective length less than 80 km (50 miles), or with a voltage less than 69 kV. Unlike medium transmission lines and long transmission lines, the line charging current is negligible, and hence the shunt capacitance can be ignored.

What is the effect of shunt capacitance at the terminal of a transmission line?

Shunt capacitance in the transmission line causes voltage amplification ( The receiving end voltage (Vr) may become double the sending end voltage (Vs) (generally in case of very long transmission lines). To compensate it, shunt inductors are connected across the transmission line.

What is capacitance effect?

When two electrical conductors at different voltages are close together, the electric field between them causes electric charge to be stored on them; this effect is capacitance. The parasitic capacitance between the turns of an inductor or other wound component is often described as self-capacitance.

What is shunt capacitance in transmission lines?

What is characteristic impedance of a transmission line?

The characteristic impedance or surge impedance (usually written Z0) of a uniform transmission line is the ratio of the amplitudes of voltage and current of a single wave propagating along the line; that is, a wave travelling in one direction in the absence of reflections in the other direction.

What do you mean by medium transmission line how capacitance effect is taken to account?

Since medium transmission lines have sufficient length exceeding 80 km and usually operate at voltages exceeding 20 kV, the capacitive current is appreciable and, therefore, line capacitance is to be taken into account.