Special fault electric arc detection arc-extinguishing device for photovoltaic confluence

Abstract

The invention provides a special fault electric arc detection arc-extinguishing device for photovoltaic confluence. The special fault electric arc detection arc-extinguishing device for photovoltaic confluence is characterized by comprising a first fly-eye lens with greater attenuation characteristic on electric arc light and a second fly-eye lens with broad spectrum light transmission characteristic, wherein a first photosensitive tube group and a second photosensitive tube group are respectively covered through the first fly-eye lens and the second fly-eye lens, the first photosensitive tube group only radiates out sunlight scattering photoelectric signals, the second photosensitive tube group outputs sunlight and electric arc light scattering photoelectric signals, the output ends of the first photosensitive tube group and the second photosensitive tube group are connected with a signal topology processing module, the signal topology processing module outputs amplified electric arc light photoelectric signals, and the photoelectric signals are fault electric arc detection signals. The special fault electric arc detection arc-extinguishing device has the advantages that the accurate fault electric arc detection in narrow-space high-voltage direct current operation environment of a photovoltaic confluence box can be realized, the in-time intervention control is realized, a power supply is cut off, the electric arc is extinguished, and accidents are eliminated.

Description

technical field [0001] The invention relates to a device for monitoring and extinguishing a high-voltage DC discharge arc in a photovoltaic combiner box. Background technique [0002] The solar photovoltaic power generation technology of green energy has been widely valued and applied under the multiple pressures of increasing energy depletion and long-term protection of the ecological environment. At present, the photovoltaic power generation industry at home and abroad is showing a trend of rapid development. The photovoltaic lightning protection intelligent combiner box is used in the confluence and distribution facilities of the photovoltaic cell array of the solar power generation system to realize the confluence, monitoring, protection and communication functions of the photovoltaic cell array. It is an important front-end equipment in the photovoltaic power station system facilities. [0003] The photovoltaic combiner box is in the working environment of DC high volt...

AI Technical Summary

Problems solved by technology

[0013] The above-mentioned voltage detection method cannot detect the fault waveform because the combiner box is a DC voltage waveform; and the pressure detection method is easy to cause missed judgment because the arc fault pressure in the combiner box is lower than the pressure threshold required by the detection device.

ABB’s ARC fault arc detection system is suitable for open busbar systems, and the interval of arc sensors needs to be 5-6m, so the 0.07m photovoltaic combiner box 3 cannot be applied in the space of

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