CETC CETC-375M/120, Руководство по установке, Страница: 24 / 27

光伏组件安装手册
22
倍。您可在所用型号组件的技术说明书中找到额定电流。测量值随着气候条件、时刻和组件的遮光
情况发生显著变化。
It can be measured directly by connecting a digital multimeter (Fluke series is
recommended) to both ends of a series module, or crude measurement can be made using a load
such as a PV lamp. Note that the rated scale or load current of the ammeter should be greater
than 1.25 times the rated short-circuit current of the series module. You can find the rated current
in the technical specification of the module of the model used. The measured values vary
significantly with climatic conditions, time and shading of the modules.
 低电压故障排除
A low-voltage fault is troubleshooting
鉴别正常的低电压和故障低电压。这里提到的正常低电压是指组件开路电压的降低，它是由太
阳能电池温度升高或辐照度降低造成的。故障低电压通常是由于终端连接不正确或旁路二极管损坏
引起的。
Identify normal undervoltage and fault undervoltage. The normal low voltage referred to
here refers to the reduction of the open circuit voltage of the module, which is caused by the
increase in solar cell temperature or the decrease in irradiance. Fault undervoltages are usually
caused by incorrect terminal connections or by bypass diode damage.
①首先，检查所有的电线连接，确保没有开路，连接良好。
①
First, check all wire connections to make sure they are open and well connected.
②检查每个组件的开路电压：用一块不透明的材料完全覆盖组件。断开组件两端的导线。取掉
组件上的不透明材料，检查并测量终端的开路电压。如果测量的电压只是额定值的一半，说明旁路
二极管已坏。
②
Check the open circuit voltage of each module: cover the module completely with an
opaque material. Disconnect the wires at both ends of the assembly. Remove the opaque
material from the assembly and check and measure the open circuit voltage of the terminal. If the
voltage measured is only half of the rated value, the bypass diode is broken.
③在辐照度不足（很低）的情况下，如果终端的电压与额定值相差 5%以上，说明组件连接不好。