Week 5

During the lab time of this week, a mistake was been found that we have not realized the conceptions between active power and reactive power. The given condition is that the rated power of the load impedance (Series R Load2)is 60MVA, but I have enter the value '60e3' to active power(Watt) by careless mistake. Thus, the calculated result is not agree with the simulated result. Then, the component settings have been checked and modified again. For convenience, the load has been regarded as a pure resistor with the voltage of 14.4kV and active power of 10MW. The nether figure can be recognized the modification directly.

Series R Load2(Modification)

Moreover, the improved circuit and the specific calculation process are shown below:

While, the measurement results of simulation have also been changed that are revealed in the following Figures.

No Fault
Vp = 10.5kV, Ip = 500A

Three Phase Fault

No Fault: Vp = 10.5kV, Ip = 500A

Fault value: Vp' = 0, Ip' = 3000A

According to the consequence of three phase fault simulation shown above, it is easy to see the calculated current value 537.4A(theory) is similar to the simulated current value 500A(experiment) under steady state. However, during the transient time, the calculated fault current value 5361.28A(theory) differs from the simulated fault current value 3000A(experiment). Therefore, the calculation for the actual fault current possibly has some mistakes and we did not work it out.

SLG Fault

No Fault: 

Vp = 10.5kV, Ip = 500A

Fault value(peak): 

Va' = 0, Vb' = 10.5kV, Vc' = 10.5kV
Ia' = 3000A, Ib' = 500A, Ic' = 500A

LL Fault

No Fault: 

Vp = 10.5kV, Ip = 500A

Fault value(peak): 

Va' = 10.5kV, Vb' = 0, Vc' = 5kV; 

Ia' = 500A, Ib' = 2000A, Ic' = 1500A

DLG Fault

No Fault: 

Vp = 10.5kV, Ip = 500A

Fault value(peak): 

Va' = 10.5kV, Vb' = 0, Vc' = 0; 
Ia' = 500A, Ib' = 2700A, Ic' = 2150A

What are we going to do next?

• Find the mistake of fault current calculation
• Design poster
• prepare for the bench inspection (presentation, questions,etc.)
• Start to work on the dissertation