据已经为超超临界燃煤发电机组提供过屏蔽控制电缆的电缆厂家称,现代火电厂的DCS控制系统结构复杂而精密,对控制电缆的屏蔽系数要求很高;尤其是控制电缆绝缘线芯的截面很小,ECPA81-2导体规格几乎全是1.5mm2,在制造过程中,很容易发生导体被拉细或拉断、铝箔断裂脱节等缺陷,因此需要特别注意,并且一定做导通试验。(南方电缆网罗惠)
小资料:
1)超临界火力发电机组
所谓超临界机组是指主蒸汽压力大于水的临界压力22.12兆帕的机组,而ECPA81-2亚临界机组通常指出口压力在15.7~19.6兆帕的机组。习惯上,又将超临界机组分为两个层次:一是常规超临界参数机组,其主蒸汽压力一般为24兆帕左右,主蒸汽和再热蒸汽温度为540~560℃;二是超超临界机组,其主蒸汽压力为25~35兆帕及以上,主蒸汽和再热蒸汽温度一般580℃以上。
2)超临界火力发电机组的DCS控制系统
ECPA81-2超临界火力发电机组采用的DCS控制系统,又称分散控制系统、分散型控制系统或集散控制系统。电力行业内习惯上称为4C控制系统,即把控制技术、计算机技术、通信技术和显示技术合为一体的一体化控制系统。
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