Determination of the voltage regulation of a medium transmission line model.

Experiment No.: – 12

Aim of the Experiment: –

Determination of the voltage regulation of a medium transmission line model.

Apparatus Required: –

Sl. No.NameSpecificationQuantity.
1Medium Transmission Model/setup with SCADAπ model transmission line1 no.
2Connecting WiresPatch cordAs per required.
Table No. 12.1

Circuit diagram: –

Fig. 12.1: Block Diagram
Fig. 12.2
Fig. 12.3
Fig. 12.4: Meter readings

Theory: –

When the load is supplied, there is a voltage drop in the line due to resistance and inductance of the line and therefore, receiving end voltage VR is usually less than sending-end voltage VS. The voltage drop i. e difference of sending-end voltage and receiving-end voltage expressed as a percentage of receiving-end voltage is called the regulation.

\[\color\green{\%\; of\; Voltage\; Regulation \;=\;}\color\red{\dfrac{V_S-V_R}{V_R}\;X\;100}\]

Where VS is the sending end voltage and VR is the receiving end voltage.(VS & VR are the magnitudes of voltage)

The lower voltage regulation better it is because low voltage regulation means little variation in receiving-end voltage due to variation in load current.

As per IE rule 54: –

  • +-6% in the case of low voltage ( up to 250V) & medium voltage (up to 650V)
  • +-6% to +-9% in the case of high voltage (up to 33kV)
  • +-12.5% in case of extra high voltage (above 33kV)

Procedures: –

  1. Switch ON, MCB on main panel.
  2. Put forward /reverse switch SW1 on panel at forward position.
  3. 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.
  4. Now select “short TL” button & Observe C1 to C3 CM should be green.
  5. 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		ɸSReceiving 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% of Voltage Regulation with load =[(VS-VR)/VR*100]% of Voltage Regulation with no-load =[(VS-VR)/VR*100]
1
2


Table No. 12.2

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
Table No. 12.3

Conclusion: –

To be written by student.

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