The following IT secondary readings were taken at a new digital feeder protection panel in a utility application. The CT ratio is 150:5 and the power system has a nominal voltage of 18000V with a PT ratio = 10200/120V. Both IT's are wye connected. Phase rotation = RWB. = 2.90 AZ-10° Jw=2.95 AZ-129° b= 2.85 AZ +113° V=119.0 V 40° Kwn- 119.2 V Z-118° Vbn=120.0 V4 +121° 1. Plot the secondary voltage and current phasors on a single phasor diagram in AutoCAD format. Ensure the diagram is neat, lines are straight, magnitudes and angles to scale, and all required diagram labelling is present. 2. Calculate the primary Phase current, Phase to neutral and Phase to Phase voltages, Total kW, KVAR and KVA. Include magnitudes and phase angles. Show your work. JK= Jx= Kro= Kwn= Kow= Kwb= Jb= VbQ= Vbr= Total kW= Total KVAR= Total KVA= 3. Plot the Question 2 data to scale on a PQ diagram for the Red phase. Correctly label the primary W, VAR, VA and phase angle.

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The following IT secondary readings were taken at a new digital feeder protection panel in a utility
application. The CT ratio is 150:5 and the power system has a nominal voltage of 18000V with a PT ratio
= 10200/120V. Both IT's are wye connected. Phase rotation = RWB.
= 2.90 AZ-10°
Jw=2.95 AZ-129°
b= 2.85 AZ +113°
V=119.0 V 40°
Kwn- 119.2 V Z-118°
Vbn=120.0 V4 +121°
1. Plot the secondary voltage and current phasors on a single phasor diagram in AutoCAD format.
Ensure the diagram is neat, lines are straight, magnitudes and angles to scale, and all required diagram
labelling is present.
2. Calculate the primary Phase current, Phase to neutral and Phase to Phase voltages, Total kW, KVAR
and KVA. Include magnitudes and phase angles. Show your work.
JK=
Jx=
Kro=
Kwn=
Kow=
Kwb=
Jb=
VbQ=
Vbr=
Total kW=
Total KVAR=
Total KVA=
3. Plot the Question 2 data to scale on a PQ diagram for the Red phase. Correctly label the primary W,
VAR, VA and phase angle.
Transcribed Image Text:The following IT secondary readings were taken at a new digital feeder protection panel in a utility application. The CT ratio is 150:5 and the power system has a nominal voltage of 18000V with a PT ratio = 10200/120V. Both IT's are wye connected. Phase rotation = RWB. = 2.90 AZ-10° Jw=2.95 AZ-129° b= 2.85 AZ +113° V=119.0 V 40° Kwn- 119.2 V Z-118° Vbn=120.0 V4 +121° 1. Plot the secondary voltage and current phasors on a single phasor diagram in AutoCAD format. Ensure the diagram is neat, lines are straight, magnitudes and angles to scale, and all required diagram labelling is present. 2. Calculate the primary Phase current, Phase to neutral and Phase to Phase voltages, Total kW, KVAR and KVA. Include magnitudes and phase angles. Show your work. JK= Jx= Kro= Kwn= Kow= Kwb= Jb= VbQ= Vbr= Total kW= Total KVAR= Total KVA= 3. Plot the Question 2 data to scale on a PQ diagram for the Red phase. Correctly label the primary W, VAR, VA and phase angle.
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