Electric Field Distribution As Obtained From Comsol Simulation - Engineering Assignment Help

Assignment Task

Figure 3 – 3 air-filled voids. Same size, different locations
(i) Observe the results of figure 2, provide the theory and formulae to determine the electric field in this case. (10) (ii) select any 3 positions radially in the main insulation and determine the distribution of electric field using manual calculations. (10) (iii) Contrast with the results using the analytical approach you are taught in class. (10)
(i) Observe the results of figure 3 with 3 circular air-filled voids in the insulation material and comment on the changes to the distribution of electrical field/electrical stress in relation to the position of a void in the cable. (10) (ii) Using the theories learnt from class, explain how and why the change in position and size of a void would affect the stress inside the insulation (no need for calculation). Also, discuss the implications of this stress related to the occurrence of partial discharge and real world cable condition assessment. (10)
(Note: Due to the special circumstance this year, the lab session of using COMSOL will be taught online. You will need to access COMSOL via VPN from your own laptop. The CW report will not depend on the results of using the software package. Instead, the required results are already provided above. It will be for exercise only)
Part B [Subtotal: 50%]
You have been collecting data in HV Lab regarding the condition of an insulator which has been collected from a transmission line. The recorded data (are collected from the output from an HFCT (High Frequency Current Transformer) which is measuring the leakage current and an antenna which is located nearby.
You can access the data from the link below:Critically comment on your observations from the graphs. (e.g.: look for repetition patterns of high-intensity pulses, similarities and differences between two graphs, etc.) [6 marks]
Explain briefly (max 150 words) the two techniques that are being used in this experiment for condition monitoring of insulators, [6 marks]
Explain why this test normally should be carried out under wet condition? [4 marks]
In order to evaluate the pollution severity on the surface of an insulator collected from an overhead transmission line, the deposit was removed and carefully collected from the surface of the insulator excluding metal parts. It was dissolved in V=500 cm3 demineralized water. The resulting slurry was kept stirred for at least 2 minutes before the measurement of its volume conductivity ?20 (S/m) at the temperature 20 °C.
[see the guide below to find ?20 based on your student ID number]
The water containing pollutants after measuring the conductivity was filtered out by using a funnel and pre-dried and weighed filter paper (the net weight of the clean filter is 0.82g).
The weight of the filter paper containing pollutants under dry condition is measured to be Wf (g).
[see the guide below to find Wf based on your student ID number]
The area of the insulator surface is A=2887 cm2.
Calculate the ESDD Equivalent salt deposit density (mg/cm²). and the NSDD non-soluble material deposit density (mg/cm2). [10 marks]
Demonstrate your calculated ESDD and NSDD on the Figure 1 below (reproduce the Figure in your report) and determine the severity of pollution on the insulator. [3 marks]
You are going to determine the number of required insulator for a 400-kV overhead transmission line (I-string). If the leakage distance of one cap-and-pin insulator is 32cm based on the recommended leaking distance per kV (Table 1): determine the number of required insulators (for the location that this insulator will be installed). [5 marks]
Discuss how the calculated number of insulator can affect the design and cost of the tower(pylon). 

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