According to the significance of the user and the load level, power loads are typically categorized into three grades. The power supply method for each grade is generally determined based on specific principles to ensure reliability and safety:
(1) Primary Load: This refers to critical loads where an unexpected power outage could result in personal injury, severe equipment damage, or significant economic losses. To prevent such situations, primary loads must be supplied by at least two independent power sources. In cases where higher reliability is required, these two sources should originate from different locations to minimize the risk of simultaneous failure.
(2) Secondary Load: These are loads that, if suddenly powered off, may cause major equipment damage, produce a large amount of waste, or disrupt significant production processes. Secondary loads are usually supplied through a dual-loop line. Alternatively, they can also be powered by a single dedicated circuit. However, for important secondary loads, it's recommended that the dual-loop lines be connected to different transformers or busbar sections, ensuring better redundancy and system stability.
(3) Tertiary Load: This category includes loads that experience only minor impact when power is lost. These loads are not strictly required to have continuous power supply and typically do not require backup power. The power supply for tertiary loads can be arranged according to the local power grid conditions and is often less critical in terms of reliability requirements.
In summary, the classification of power loads helps in designing more efficient and reliable electrical systems. By understanding the importance of each load type, engineers can make informed decisions about power supply strategies, ensuring both safety and cost-effectiveness.
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