Experiment No. : – 13
Aim of the Experiment: –
Determination of the line efficiency of a medium transmission line model.
Apparatus Required: –
| Sl. No. | Name | Specification | Quantity. |
|---|---|---|---|
| 1 | Medium Transmission Model/setup with SCADA | π model transmission line | 1 no. |
| 2 | Connecting Wires | Patch cord | As per required. |
Circuit diagram: –
Theory: –
When the load is supplied there are line losses due to ohmic resistance of line conductors and power delivered at the load end of a transmission line is less than the power supplied at the sending end.
Efficiency of a transmission line is defined as the ratio of power delivered at the receiving end to the power sent from the sending end.
Transmission efficiency is given by the expression: –
Where Vr, Ir and Cosɸr are the receiving end voltage, current and power factor (all phases values) while Vs,Is and Cosɸs are the sending end voltage, current and power factor (all phases values).
Procedures: –
- Switch ON, MCB on main panel.
- Put forward /reverse switch SW1 on panel at forward position.
- Screen Control: Open calculation of efficiency, regulation and power flow screen on PC. Now press ON button to make circuit breaker ON on the SCADA screen.
- Now select “short TL” button & Observe C1 to C3 CM should be green.
- Select minimum load. Now take different readings as per observation table.
Observation Table: –
| Sl. No. | R load (Ω) | Sending end Voltage VS (Volts.) | Sending end Current IS (Amps.) | Sending end Power PS (watts) | Sending end Power QS (VAR) | Sending end Power SS (VA) | Powe Factor CosɸS | ɸS | Receiving end Voltage VR (Volts.) | Receiving end Current IR (Amps.) | Receiving end Power PR (watts) | Receiving end Power QR (VAR) | Receiving end Power SR (VA) | Powe Factor CosɸR | ɸR | % η efficiency[(PR/PS)*100] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | ||||||||||||||||
| 2 |
Table No. 13.2
Observation Table for Load: –
| Sl. No. | R load (Ω) | Load end Voltage VL (Volts.) | Load end Current IL (Amps.) | Load end Power PL (watts) | Load end Power QL (VAR) | Load end Power SL (VA) | Powe Factor CosɸL | ɸL |
|---|---|---|---|---|---|---|---|---|
| 1 | ||||||||
| 2 |
Conclusion: –
Written by student.
