A major section of power system engineering deals in the transmission of electrical power from one particular place (e g. Generating station) to another like substations or distribution units with maximum efficiency. So its of substantial importance for power system engineers to be thorough with its mathematical modeling. Thus the entire transmission system can be simplified to a two port network for the sake of easier calculations.
The circuit of a 2 port network is shown in the diagram below. As the name suggests, a 2 port network consists of an input port PQ and an output port RS. Each port has 2 terminals to connect itself to the external circuit. Thus it is essentially a 2 port or a 4 terminal circuit, having
Supply end voltage = VS
and Supply end current = IS
Given to the input port P Q.
And there is the Receiving end Voltage = VR
and Receiving end current = IR
Given to the output port R S.
As shown in the diagram below.
and Supply end current = IS
Given to the input port P Q.
And there is the Receiving end Voltage = VR
and Receiving end current = IR
Given to the output port R S.
As shown in the diagram below.
Now the ABCD parameters or the transmission line parameters provide the link between the supply and receiving end voltages and currents, considering the circuit elements to be linear in nature.
Thus the relation between the sending and receiving end specifications are given using ABCD parameters by the equations below.
VS = A VR + B IR ———————-(1)
IS = C VR + D IR ———————-(2)
Thus the relation between the sending and receiving end specifications are given using ABCD parameters by the equations below.
VS = A VR + B IR ———————-(1)
IS = C VR + D IR ———————-(2)