Generalized Constant of the transmission line is given by sending end
voltage and sending end current equation
VS = AVR
+ BIR
IS = CVR + DIR
Where
VS =
Sending end voltage
IS =
Sending end current
VR =
Receiving end voltage
IR =
Receiving end current
A, B, C and D = Constant
The generalized constant of the transmission line is found out by
Receiving end of the transmission line open
circuit, receiving end current IR = 0
Transmission Line Parameter A
VS = AVR
A = VS
/ VR and
- The constant A is defined as the ratio of sending end voltage to the receiving end voltage when receiving end of the line is open circuited.
- It is also called as reverse voltage gain. It is unitless.
Transmission Line Parameter C
IS = CVR
C = IS
/ VR
- The constant C is defined as the ratio of sending end current to the receiving end voltage when receiving end of the line is open circuited.
- Its unit is 1 / ohm or mho.
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Receiving end of the transmission line is
short circuited, when receiving end voltage VR = 0
Transmission Line Parameter B
VS = BIR
B = VS
/ IR
- The constant B is defined as the ratio of sending end voltage to the receiving end current when receiving end of the transmission line is short circuited.
- Its unit is ohm.
Transmission Line Parameter D
IS = DIR
D = IS
/ IR
- The constant D is defined as the ratio of sending end current to the receiving end current when receiving end of the transmission line is short circuited.
- It is also called as reverse current gain. It is unit less.
Summary
Transmission line parameters |
How to Find
out? |
Formula |
Unit |
Better known as |
A |
Receiving end of transmission line is open circuited |
VS / VR |
Unit less |
Reverse voltage gain |
B |
Receiving end of transmission line is short
circuited |
VS / IR |
ohm |
|
C |
Receiving end of transmission line is open circuited |
IS / VR |
mho |
|
D |
Receiving end of transmission line is short
circuited |
IS / IR |
Unit less |
Reverse current gain |
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