连接到电网的光伏电站也受到过电压的影响
从线路本身。如果存在带接地金属的隔离变压器
屏蔽，逆变器受到保护，免受变压器本身的过电压。
如果变压器不存在，或者如果变压器没有屏蔽，则为
需要在逆变器下游立即安装合适的SPD。
该SPD应具有以下特征：
•类型2
•大额定工作电压Ue>1.1 Uo24
•保护级别提高≤ 公司
25
•标称放电电流≥ 5 kA
•具有测试短路能力的热保护
寿命结束时的电流，并与适当的后备保护进行协调。
如果建筑物的风险分析规定安装外部LPS，则
有必要放置一个SPD，以在
电力输送点。此类SPD应具有以下特征：
•类型1
•大额定工作电压Ue>1.1 Uo
•保护级别提高≤ 公司
•冲击电流Iimp≥ 每极25 kA
•超过短路电流的后续电流Ifi熄灭
在安装点，并与适当的后备保护进行协调

PV plant connected to the grid is subject also to the overvoltages coming from the line itself. If a separation transformer is present, with earthed metal shield, the inverter is protected against the overvoltages of the transformer itself. If the transformer is not present or in case of a transformer without shield, it is necessary to install a suitable SPD immediately downstream the inverter. This SPDs should have the following characteristics: • Type 2 • Maximum rated service voltage Ue > 1.1 Uo24 • Protection level Up ≤ 25 • Nominal discharge current In ≥ 5 kA • Thermal protection with the capability of estinguishing the short-circuit current at the end of life and coordination with suitable back-up protection. If the risk analysis for the building prescribes the installation of an outside LPS, it is necessary to position an SPD for the protection against direct lightning at the power delivery point. Such SPD should have the following characteristics: • Type 1 • Maximum rated service voltage Ue > 1.1 Uo • Protection level Up ≤ • Impulse current Iimp ≥ 25 kA for each pole • Extinction of the follow-up current Ifi exceeding the short-circuit current at the installation point and coordination with a suitable back-up protection