chaveamento de bancos de capacitores
English translation: capacitor bank switching
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| 23:05 Nov 2, 2017 |
| Portuguese to English translations [PRO] Tech/Engineering - Electronics / Elect Eng | |||||||
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|  Selected response from: Gilmar Fernandes United States Local time: 08:21 | ||||||
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| 4 +3 | capacitor bank switching |
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Answers
13 mins confidence: 
peer agreement (net): +3
peer agreement (net): +3capacitor bank switching Explanation: http://engineering.electrical-equipment.org/electrical-distr... The continuous growth of the electricity demand in the heavy industry, regarding the installation of large motors in the system, involves the increase of the reactive power consumption due to the typical power factor in steady-state and during the motor starting (PF: 80% and 20% respectively). As a result of this situation, the transmission and distribution system undergoes low voltage profiles, as well as losses in transmission lines and power transformers. An adopted solution by the Grid Operators has been to install capacitor banks, as a local reactive source, whose benefits are the decrease of the reactive consumption and electrical losses. Furthermore, operating voltages in the power system increase. However, when capacitors are switched, the power system faces transient overvoltages, which theoretically could reach peak values phase to ground of aproximately 2 p.u. This situation could be aggravated when other capacitor banks are located in the same power system. In addition, it might even occur transient overcurrents of great magnitude and high frequencies which are able to exceed considerablely the nominal current of the capacitor bank for some milliseconds. |
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