Table of contentsIntroductionHigh voltage power linesSignal detectionSignal transmissionSignal interpretationIntroductionElectric energy is moved from the production site (source where it is converted from another form of energy ) to the load (where it will be used) via high voltage voltage transmission lines. High voltage is used to reduce energy losses, but it produces a strong electric field that results in partial discharge when it exceeds the breakdown resistance of the insulating material. Partial discharge can cause the insulating material to rupture and cause energy immersion. There are several reasons for partial discharge, such as improper cable installation, stuck wires, and manufacturing defects. Engineers consider partial discharge testing a good way to detect any problems with cables and evaluate the insulation of electrical devices. This will be discussed in this paper, and first the structure of the cables will be discussed as if Pd occurs. Say no to plagiarism. Get a tailor-made essay on “Why Violent Video Games Should Not Be Banned”?Get the original essayHigh Voltage Power LinesHigh Voltage Power Cable ComponentsConductor, Inner Semiconductor Screen, Insulator, External Semiconductor, Semi Screen -earth conductor and protective sheet are the main components of the cable from inside to outside respectively. The conductor is where current is primarily transferred and is usually made from aluminum or copper as they provide the minimum losses. The inner semiconductor is a single layer that reduces stress on the insulator due to the electric field by acting as a smooth, homogeneous surface. Insulators wrap electrical cables to separate electrical conductors and prevent current from flowing through them, while the outer semiconductor prevents contact between the insulator and ground avoiding voids and gaps that can occur due to mechanical stress and thermal. The metal earth shield protects the insulation and conducts the fault current to earth until the system is turned off. Finally, the protective sheet protects the cable from damage. Cable configuration. The components mentioned above are what constitutes a cable, but there are other components that are used along cables in the transmission system: joints and terminations. The joints connect the cable together and are used because the length of a single cable is not sufficient to cover the long distances required. On the other hand, the terminations provide the interface between the cable and the electrical system. Partial discharges typically occur in joints and terminals as they are installed on sites – unlike cables which are manufactured and then transported – and this makes them more prone to human error. Types of Partial Discharge: Internal Discharge Decomposition due to internal charge begins when there is a void or cavity in the insulator which will have low dielectric strength: electric field strength in voids greater than that of dielectrics. So even if the voltage is operating at its average level, the breakdown can occur due to exceeding the breakdown resistance. Surface Discharge A surface discharge appearing on the surface of the insulating material occurs when the resistance of the material weakens due to different environmental effects. It is high stress that triggers this type of Pd, so it usually occurs on cable accessories because there is no external semiconductor shield..