UK National GridDistribution SystemTask8a.
Summarise the reasons for a three-phase supplynetwork A three-phase networkis a currently used network to exchange current electric power into generation,transmission and distribution. Worldwide Power Grids utilize the current systemto exchange power. The fundamental reasons the three-stage network was set upis because of the way that it has a more extended life expectancy than that ofa one-stage network. A three-stage system will create 3x the energy of that ofa single stage network. Additionally, with the three-stage you get 3 wiresrather than the standard 2 wires. Another reason three-stage systems are usedis the reality that they can withstand more pressure and force. For instance, ifa turbine has a single one-phase generator its likelihood being shaken to thepoint of detachment because of the vibrations and torque assortments is veryhigh. Be that as it may, a single three-phase generator could deal with thiswith no pressure or issues.
Consistent power is one of the three-phasesystem’s key highlights. The power is always conveyed all while the measure ofconductor material is not as much as a one-phase arrange. On the off chancethat a test was led for both a one-phase and three-phase network, the twosystems running a similar measure of energy and voltage. The outcomes woulddemonstrate the three-phase would be the best of the two. Over the long haulthe three-phase network is the best alternative.
b. Use diagrams to show the voltages at allsignificant parts of the system, from generation through to end user, andbriefly explain the reason for the voltages usedCustomers get power throughpower stations. Wires and cables inside the National Grid are usedto transfer electricity from power stations.
Energy is lost as heat when highvoltage is exchanged through wires and cables.The National Grid attempts to/must keep a low current to restrain from losing more heat. The more heatis lost, the higher the current gets. A high voltage can transfer such a low current through cablesand wires and to ensure nomore energy is lost.
For instance, “Power stations create power at25,000V. Power is sent through the National Grid cables at 400,000V, 275,000Vand 132,000V.” (Bbc.co.uk, 2018) Power stations use step up transformersas they can make the high voltages that are crucial to transfer power throughelectrical cables. Another transformer is used to drastically diminish the voltage before itenters a household. This is donethrough a step-down transformer, which is the last procedure before a safe voltageof 230V is sent into every house.
BBC – GCSE BITESIZE: THENATIONAL GRID In-content: (Bbc.co.uk, 2018) Your Bibliography:Bbc.co.
uk. (2018). BBC – GCSE Bitesize: The National Grid.
online Availableat: http://www.bbc.co.uk/schools/gcsebitesize/science/aqa_pre_2011/vitality/using_electricityrev1.shtmlAccessed 19 Jan. 2018.
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