Which is better nominal PI or nominal t?

If shunt capacitance is on a higher side then nominal π method is better. Note that for a given data the solution by nominal T and π methods will NOT give the same result – because of the differing degrees of approximations. However nominal π method is generally recommended and used in modeling.

Why is nominal Pi preferred?

Originally Answered: Which method is useful in a medium transmission line, nominal “pi” or nominal “T”? Pi. Models are generally preferred in medium transmission lines, as the shunt compensation for reactive power and power factor correction can be easily done in case of pi model, at the load side.

Which method is used to determine the performance of medium transmission line?

Hence, performance of Medium transmission lines depends on R, L and C. Explanation: Performance analysis of balance transmission line is done only. And is done on per phase basis. No symmetrical component method or reactance diagram method is required for performance analysis.

What are the methods of medium transmission line?

These lumped parameters of a medium length transmission line can be represented using three different models, namely:

• Nominal Π representation (nominal pi model)
• Nominal T representation (nominal T model)
• End Condenser Method.

Why nominal T method is used?

In Nominal T model of Transmission line, the whole shunt capacitance of line is assumed to be lumped at the middle of the line. In this method there is no effect of shunt capacitance at sending end on the line voltage drop and hence on voltage regulation but this accounts for the charging current in sending end.

What is nominal PI method?

In Nominal π Method, the shunt capacitance of each line i.e. phase to neutral is divided into two equal parts. One part is lumped at the sending end while the other is lumped at receiving end as shown in figure below.

What is considered during nominal T method?

In a nominal T model of a medium transmission line, the series impedance is divided into two equal parts, while the shunt admittance is concentrated at the centre of the line. The nominal T model of a medium transmission line is shown in the figure.

What is nominal T and PI method?

In Nominal T model of Transmission line, the whole shunt capacitance of line is assumed to be lumped at the middle of the line. In Nominal π Method, the shunt capacitance of each line i.e. phase to neutral is divided into two equal parts.

Which of the following is not a method for solution of medium transmission line *?

8. Which of the following is not a method for solution of medium transmission line? Explanation: Actual method used for solution of medium transmission lines are end condenser method, nominal-T method and nominal π method.

What is nominal T?

In a nominal T model of a medium transmission line, the series impedance is divided into two equal parts, while the shunt admittance is concentrated at the centre of the line. The nominal T model of a medium transmission line is shown in the figure. In the phasor diagram: OA = Vr – receiving end voltage to neutral.

What is pi transmission line?

Description. The PI Section Line block implements an N-phase transmission line with parameters lumped in PI sections. For a transmission line, the resistance, inductance, and capacitance are uniformly distributed along the line. The following figure shows one PI section of a three-phase transmission line.

What is the value of c for nominal T method of medium transmission line?

AC = IrR/2 – Voltage drop in the reactance of the right-hand half of the line.It is perpendicular to OB, i.e., Ir. OD1 = Vab – voltage at the midpoint of the line across the capacitance C.

What is the nominal pi model of a medium transmission line?

Nominal Pi Model of a Medium Transmission Line In the nominal pi model of a medium transmission line, the series impedance of the line is concentrated at the centre and half of each capacitance is placed at the centre of the line. The nominal Pi model of the line is shown in the diagram below.

What is nominal T method in transmission line?

Nominal T Method in Medium Transmission Line. In the nominal T method the capacitance of the line is assumed to be concentrated at the middle point of the line, and at both side half of line resistance and inductance is lumped. V S is the sending end voltage.

What are the characteristics of nominal Pi method?

In the nominal pi method total line capacitance is assumed to be lumped and divided into two halves to be connected across sending end and receiving end respectively. Total line resistance and inductance are assumed to be present in middle of the line.

What is the advantage of nominal π over T in power system modeling?

However nominal π method is generally recommended and used in modeling. Main reason is that a T representation creates a new node ( bus) whereas the π representation does not. This is a clear advantage in power system studies where you have to model many many lines. For lines above about 100 miles you have to use rigorous method.