The sending-end and receiving-end voltages of a three-phase transmissi...
The sending-end and receiving-end voltages of a three-phase transmissi...
Given data:
- Sending-end and receiving-end voltages: 230 kV
- Per phase line impedance: 14 ohm
- Load: 200 MW
To find:
- Maximum steady-state power that can be transmitted (MW/phase)
Formula:
The maximum steady-state power that can be transmitted over a transmission line is given by the formula:
\[
P_{\text{max}} = \frac{{V^2}}{{Z}}
\]
where:
- \(P_{\text{max}}\) is the maximum power that can be transmitted
- \(V\) is the sending/receiving voltage
- \(Z\) is the line impedance
Calculation:
Substituting the given values into the formula, we have:
\[
P_{\text{max}} = \frac{{(230 \text{ kV})^2}}{{14 \Omega}}
\]
Converting the voltage to volts and simplifying, we get:
\[
P_{\text{max}} = \frac{{(230 \times 10^3 \text{ V})^2}}{{14 \Omega}}
\]
\[
P_{\text{max}} = \frac{{52900 \times 10^6 \text{ V}^2}}{{14 \Omega}}
\]
\[
P_{\text{max}} = 3785.71 \times 10^6 \text{ W}
\]
Converting the power to megawatts, we have:
\[
P_{\text{max}} = 3785.71 \text{ MW}
\]
Rounding off the answer to one decimal place, the maximum steady-state power that can be transmitted over the line is approximately 3778.5 MW.