Photovoltaic power plant grid connection point: For a photovoltaic power station with a booster station, it refers to the high-voltage side busbar or junction of the booster station; for a photovoltaic power station without a booster station, it refers to the output summary point of the photovoltaic power station.
Island phenomenon: When the grid is out of pressure, the PV power plant still maintains a state of continuing power supply to a certain part of the line in the loss-of-voltage network. For small PV plants, there should be the ability to quickly monitor silos and immediately disconnect from the grid. In general, PV inverters have the function of anti-island protection, but for the safe, stable and reliable operation of the power system, an anti-island protection device can be installed at the grid connection point. As another protection device, the distributed island can be quickly removed. power supply.
1) The SMR-3910B device can be centrally grouped or can be installed on the switch cabinet in a distributed manner. Each interval function is independent, and each device is only connected through the network and information is shared, so that the whole system is not only highly flexible, but also reliable. It has also been greatly improved, and any device failure affects only one local component.
2) The device uses a high-performance processor and a high-resolution A/D converter, combined with a dedicated measurement CT to ensure high precision of telemetry.
3) The protection function does not depend on the communication network at all, and the network does not affect the protection of normal operation.
4) The device adopts a fully sealed design, and a well-designed anti-interference component, which greatly improves the anti-vibration capability and anti-electromagnetic interference capability.
5) Designed with a watchdog function, the entire system has high measurement accuracy and anti-interference ability at the same time.
6) Friendly human-machine interface, the device adopts full-Chinese large-screen LCD display, trip report, alarm report, remote signal, telemetry, setting and so on, all have clear Chinese character identification on the LCD, which is convenient for users to use and master.