Lithium iron phosphate battery is a new kind of lithium ion battery with the ability of reliable operation in rigorous conditions, which is being widely concerned in many industries, especially being promoted in the electric car industry and energy storage industry. But it has not been applied in substation as a backup power. Taking a 110 kV substation as an example, combining with the rules of substation and characteristics of Lithium iron phosphate battery, the capacity calculation of lithium iron phosphate battery in substation power field is detailed introduced.%磷酸铁理电池作为新型锂离子电池，以其能在苛刻的条件下可靠运行的能力，正受到各行业的广泛关注，特别是在电动汽车领域和储能领域，已经开始大力推广。但其作为后备电源，在变电站站用电源领域尚未见到应用。文中以某110kv变电站作为范例，结合变电站的规程和磷酸铁锂电池的特性，详细介绍了在站用电源领域磷酸铁锂电池的容量计算。
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