![]() MetaDoctor is the ultimate video metadata editor for your. Adding metadata to your video files has never been easier. Specially designed to work with iMovie and iTunes, tags, cover art, and chapters can be edited easily and efficiently in a single convenient window. Voltage control in an electrical power system is important for proper operation for electrical power equipment to prevent damage such as overheating of generators and motors, to reduce transmission losses and to maintain the ability of the system to withstand and prevent voltage collapse.Price: $4.99, Version: 2.0.6 -> 2.0.7 ( iTunes)Īdding metadata to your video files has never been easier. In general terms, decreasing reactive power causing voltage to fall while increasing it causing voltage to rise. ![]() When reactive power supply lower voltage, as voltage drops current must increase to maintain power supplied, causing system to consume more reactive power and the voltage drops further.A voltage collapse occurs when the system try to serve much more load than the voltage can support. If the voltage drops too low, some generators will disconnect automatically to protect themselves.If the current increase too much, transmission lines go off line, overloading other lines and potentially causing cascading failures. Voltage collapse occurs when an increase in load or less generation or transmission facilities causes dropping voltage, which causes a further reduction in reactive power from capacitor and line charging, and still there further voltage reductions. If voltage reduction continues, these will cause additional elements to trip, leading further reduction in voltage and loss of the load. On an alternating-current (AC) power system, voltage is controlled by managing production and absorption of reactive power.Voltage control and reactive-power management are two aspects of a single activity that both supports reliability and facilitates commercial transactions across transmission networks.Top Importance of Present of Reactive Power The result in these entire progressive and uncontrollable declines in voltage is that the system unable to provide the reactive power required supplying the reactive power demands. First, both customer and power-system equipment are designed to operate within a range of voltages, usually within±5% of the nominal voltage.There are three reasons why it is necessary to manage reactive power and control voltage. At low voltages, many types of equipment perform poorly light bulbs provide less illumination, induction motors can overheat and be damaged, and some electronic equipment will not operate at. Second, reactive power consumes transmission and generation resources.High voltages can damage equipment and shorten their lifetimes. To maximize the amount of real power that can be transferred across a congested transmission interface, reactive-power flows must be minimized. ![]() Third, moving reactive power on the transmission system incurs real-power losses.Similarly, reactive-power production can limit a generator’s real-power capability. First, the transmission system itself is a nonlinear consumer of reactive power, depending on system loading.Voltage control is complicated by two additional factors.Both capacity and energy must be supplied to replace these losses. At very light loading the system generates reactive power that must be absorbed, while at heavy loading the system consumes a large amount of reactive power that must be replaced. The bulk-power system is composed of many pieces of equipment, any one of which can fail at any time.Ĭonsequently, system reactive requirements vary in time as load levels and load and generation patterns change.The system’s reactive-power requirements also depend on the generation and transmission configuration. Therefore, the system is designed to withstand the loss of any single piece of equipment and to continue operating without impacting any customers. That is, the system is designed to withstand a single contingency. Taken together, these two factors result in a dynamic reactive-power requirement. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |