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Photovoltaic connector--small device, big role
Photovoltaic connectors, also known as MC connectors, in the photovoltaic system, the proportion of connectors is very small, but many links need to be used, such as junction boxes, combiner boxes, cable connections between components and inverters. Many construction workers do not know enough about connectors. There are many power station failures caused by connector problems. In another report "Review and Analysis of Factors Affecting Photovoltaic Power Generation", among the TOP20 influencing factors of power plants, the damage or burning of connectors is caused. Loss of power generation came in second.
In addition to the quality of the connector itself, another very important reason for the burnout of the photovoltaic connector is that the construction is not done well, resulting in a virtual connection of the connector, which causes the DC side arc, which in turn causes a fire. The problems caused by connectors include: increased contact resistance, connector heating, shortened life, connector burnout, string power failure, junction box failure, component leakage, etc., which cause the system to fail to work normally and affect the power generation efficiency.
In the entire photovoltaic system, the DC side voltage is usually as high as 600-1000V. Once the photovoltaic module joint contacts are loose and the contact is poor, it is very easy to cause DC arcing. The DC arc drawing will cause the temperature of the contact part to rise sharply, and the continuous arc will generate a high temperature of 1000-3000 ° C, accompanied by high temperature carbonization of the surrounding devices. In the lighter case, the fuse and cables will be blown, and in the severe case, the equipment will be burnt and cause a fire.
The non-standard crimping of photovoltaic connectors is mainly due to the gap between on-site tools and operating experience, resulting in poor crimping quality. The main problem is that the copper wire of the cable is bent, some copper wires are not crimped, and the crimping part is the cable insulation layer.
After the string is completed, connect it to the PV terminal of the inverter, and try to use the photovoltaic connector originally equipped with the inverter, because this is paired with the PV terminal on the inverter. If it is crimped correctly, it can be well matched. The contact resistance is low, the heat generation is small, and the temperature is lower, and the operation is more reliable and safe.
When it comes to the crimping process, we also need to pay attention to the stripping process. The standard has strict regulations on the number of copper wires to be cut during stripping. If more copper wires are cut, it will affect the quality of crimping and flow, resulting in higher temperature rise.
For this problem, it is recommended that qualified installers can purchase professional tools, provide corresponding training to on-site installers, and establish a random inspection mechanism.
Summarize:
Photovoltaic connectors are very important components of photovoltaic systems, and they should be paid enough attention to. In the process of product selection and construction, the following points should be paid attention to:
1. Use domestic and foreign famous brand products with reliable quality,
2. The products of different manufacturers cannot be mixed together, and the products may not match.
3. Use professional wire strippers and crimping pliers, and unprofessional tools will cause poor crimping. For example, some copper wires are cut off, some copper wires are not crimped in, and they are pressed to the insulating layer by mistake, and the crimping force is too small or too large.
4. After the connector and cable are connected, check it. Under normal circumstances, the resistance is zero, and it will not be broken by pulling hard with both hands.
Photovoltaic connectors, also known as MC connectors, in the photovoltaic system, the proportion of connectors is very small, but many links need to be used, such as junction boxes, combiner boxes, cable connections between components and inverters. Many construction workers do not know enough about connectors. There are many power station failures caused by connector problems. In another report "Review and Analysis of Factors Affecting Photovoltaic Power Generation", among the TOP20 influencing factors of power plants, the damage or burning of connectors is caused. Loss of power generation came in second.
In addition to the quality of the connector itself, another very important reason for the burnout of the photovoltaic connector is that the construction is not done well, resulting in a virtual connection of the connector, which causes the DC side arc, which in turn causes a fire. The problems caused by connectors include: increased contact resistance, connector heating, shortened life, connector burnout, string power failure, junction box failure, component leakage, etc., which cause the system to fail to work normally and affect the power generation efficiency.
In the entire photovoltaic system, the DC side voltage is usually as high as 600-1000V. Once the photovoltaic module joint contacts are loose and the contact is poor, it is very easy to cause DC arcing. The DC arc drawing will cause the temperature of the contact part to rise sharply, and the continuous arc will generate a high temperature of 1000-3000 ° C, accompanied by high temperature carbonization of the surrounding devices. In the lighter case, the fuse and cables will be blown, and in the severe case, the equipment will be burnt and cause a fire.
The non-standard crimping of photovoltaic connectors is mainly due to the gap between on-site tools and operating experience, resulting in poor crimping quality. The main problem is that the copper wire of the cable is bent, some copper wires are not crimped, and the crimping part is the cable insulation layer.
After the string is completed, connect it to the PV terminal of the inverter, and try to use the photovoltaic connector originally equipped with the inverter, because this is paired with the PV terminal on the inverter. If it is crimped correctly, it can be well matched. The contact resistance is low, the heat generation is small, and the temperature is lower, and the operation is more reliable and safe.
When it comes to the crimping process, we also need to pay attention to the stripping process. The standard has strict regulations on the number of copper wires to be cut during stripping. If more copper wires are cut, it will affect the quality of crimping and flow, resulting in higher temperature rise.
For this problem, it is recommended that qualified installers can purchase professional tools, provide corresponding training to on-site installers, and establish a random inspection mechanism.
Summarize:
Photovoltaic connectors are very important components of photovoltaic systems, and they should be paid enough attention to. In the process of product selection and construction, the following points should be paid attention to:
1. Use domestic and foreign famous brand products with reliable quality,
2. The products of different manufacturers cannot be mixed together, and the products may not match.
3. Use professional wire strippers and crimping pliers, and unprofessional tools will cause poor crimping. For example, some copper wires are cut off, some copper wires are not crimped in, and they are pressed to the insulating layer by mistake, and the crimping force is too small or too large.
4. After the connector and cable are connected, check it. Under normal circumstances, the resistance is zero, and it will not be broken by pulling hard with both hands.
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