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連接到電網(wǎng)的光伏電站也受到過電壓的影響
從線路本身。如果存在帶接地金屬的隔離變壓器
屏蔽，逆變器受到保護，免受變壓器本身的過電壓。
如果變壓器不存在，或者如果變壓器沒有屏蔽，則為
需要在逆變器下游立即安裝合適的SPD。
該SPD應(yīng)具有以下特征：
•類型2
•大額定工作電壓Ue>1.1 Uo24
•保護級別提高≤ 公司
25
•標稱放電電流≥ 5 kA
•具有測試短路能力的熱保護
壽命結(jié)束時的電流，并與適當?shù)暮髠浔Ｗo進行協(xié)調(diào)。
如果建筑物的風險分析規(guī)定安裝外部LPS，則
有必要放置一個SPD，以在
電力輸送點。此類SPD應(yīng)具有以下特征：
•類型1
•大額定工作電壓Ue>1.1 Uo
•保護級別提高≤ 公司
•沖擊電流Iimp≥ 每極25 kA
•超過短路電流的后續(xù)電流Ifi熄滅
在安裝點，并與適當?shù)暮髠浔Ｗo進行協(xié)調(diào)
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
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