Seeking help regarding secondary load issues
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The design specifications for power supply and distribution systems state that in areas with low electrical load levels and located in remote locations, a single circuit of 6 kV or higher overhead lines can be used to supply secondary loads How is a low load defined here? If the power supply provider supplies a single-circuit overhead line, such as a 10kV line, does it need to be changed to a two-circuit system upon passing through the plant’s incoming cable cabinet, in order to supply power to the two backup transformers? I earnestly request guidance from experienced colleagues! !
Category 1 loads: Those for which a disruption in power generation would pose a risk of injury or death, cause severe damage to equipment that is difficult to repair, or result in significant political and economic losses. Category 2 loads: Disruption of power supply will result in the generation of large amounts of waste, significant spoilage of materials, substantial reduction in production, or serious damage to equipment, but these can be avoided by taking appropriate measures. Such as textile factories, machinery manufacturing plants, chemical plants, etc ； Third category of loads: all electrical equipment that does not fall under categories one or two. Based on the characteristics of the aforementioned electrical load, the following basic requirements are established for power supply and distribution: For Class 1 loads, it is required to use two independent power sources for supply. The so-called “two independent power sources” refer to a situation in which, if one of the power sources fails or goes offline due to maintenance, it does not affect the other power source from continuing to supply power, thereby ensuring continuity of power supply. Class II load: Dual-circuit power supply is required, that is, power from two circuits (including the main circuit, backup circuit, and tie circuit). When it is difficult to use a two-circuit system, it is permitted to use a single dedicated circuit for power supply. Category 3 loads: There are no special requirements regarding power supply; a disruption in power supply for these users has minimal impact. Nevertheless, every effort should be made to improve the reliability of power supply without increasing investment costs.