Sistem kuasa boleh didefinasikan sebagai rangkaian yang terdiri daripada unit
janaan, beban, talian tranmisi serta peralatan berkaitan bersambung untuk menjana,
menhantar dan mengedarkan kuasa elektrik ke seluruh rantau. Seperti yang dinyatakan
dari definisi. ia boleh dilihat bahawa peralatan yang berkaitan turut memainkan peranan
penting dalam menyampaikan kuasa elektrik dari satu tempat ke tempat. Kabel adalah
salah satu peralatan yang biasa digunakan kerana ia boleh menghantar isyarat. Terdapat
banyak jenis kabel yang ada bergantung kepada tujuannya. Ianya sangat penting untuk
memilih kabel yang betul agar kuasa maksimum dapat dipindahkan kepada pelanggan
dengan risiko minimum. Walau bagaimanapun, prestasi kabel boleh terjejas apabila
pelepasan separa dicipta kerana kehadiran void dalam lingkungan penebat. Penebat
memainkan peranan penting dalam peralatan bervoltan tinggi. Kegagalan penebat boleh
menyebabkan kegagalan kepada keseluruhan sistem. Setiap pelepasan separa yg berlaku
di dalam void akan melepaskan haba yang akan menyebabkan karbonisasi pada
permukaan void seterusnya menghakis permukaan bahan. Amaun pelepasan haba
dipengaruhi oleh saiz void serta kedudukan void dalam penebat. Semakin kecil saiz
void serta semakin dekat kedudukan void dengan konduktor, semakin banyak haba
dilepaskan.Sehubungan dengan itu, corak taburan suhu bagi kabel berpenebat EPR
dengan dan tanpa kehadiran void dianalisis. Dalam projek ini, model kabel dimodelkan
dengan menggunakan COMSOL Multiphysics Versi 5.2. Projek ini juga memfokuskan
kepada hasil corak taburan suhu pada saiz dan kedudukan void yang berbeza serta
voltan yang berbeza.
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Power system can be defined as network of generating units, loads and
transmission lines and also the associated equipments connected that generates,
transmits and distributes electrical power throughout region. As stated from the
definition, it can be seen that associated equipment also play an important roles in
delivering the electrical power from place to place. Hence, cable is one of the equipment
commonly used as it can transmit signal. There are many types of cable available
depending on its purpose. It is also important to choose the right cable in order to have
maximum power transferred to customer with minimum risk around the cable.
However, the performances of cable can be affected when partial discharge is created
due to the presence of void within the insulator. Insulators play an important role in
high voltage equipment. Fatal breakdown of insulator could cause catastrophic failure
for overall system. Each discharges that take place inside the void, there will be
dissipate heat which will cause carbonization of the void surface and erosion of the
material. The amount of heat dissipated is influenced by the size of void and also the
location of void within the insulator. It is established that the smaller the void and the
near nearer the location to the conductor, more heat dissipated. The insulator aging
becomes faster and breakdown can occur faster. Thus, in this paper, temperature
distribution pattern of EPR insulated cable with and without presence of void is
investigated. The cable model has been modelled using COMSOL Multiphysics Version
5.2. This paper focused on the result of temperature pattern with different void size and
locations at different electric potential.
Application of comsol multiphysics in finding temperature distribution pattern in EPR cable with presence of void / Nurun Najah Abdul Rahim