A Brief Discussion on Leakage Protection Issues of Solar Inverters
With the rapid development of the photovoltaic energy industry and the increasing penetration rate of new energy in the distribution network, leakage protection issues in power distribution systems containing photovoltaic power sources have become the key to electricity safety. "Current sensor" is an important segment in the development of the energy industry. Its core technology carries the important mission of precise control and efficient energy saving, and is crucial to promoting the implementation of green transformation and upgrading.
After the photovoltaic power supply is connected, it, together with the energy storage device, energy conversion device, AC and DC loads and protection devices, form a small power generation and distribution system. Since the power distribution system containing photovoltaic power supply contains DC link equipment, the current transmission is different from the traditional AC transmission, and the leakage current form that may be generated during the transmission process is also more complex. The popularization of power distribution systems containing photovoltaic power sources, while improving the structure of the energy industry, also faces more severe electricity safety challenges.
As the rainy season approaches, leakage faults occur frequently. Due to the large capacity of the power distribution system containing photovoltaic power sources, the tiled area of the components is large. The system itself has strong capacitive characteristics and is easily affected by environmental humidity, resulting in system capacitive leakage. It is especially serious in the morning and evening or in rainy weather. In addition, problems such as exposed cable sheaths, poor grounding, and poor sealing of the combiner box can also cause system leakage failures.
Leakage faults in power distribution systems containing photovoltaic power sources often occur. Considering that the photovoltaic system leakage current has complex components, few current side values, and small current amplitude, it is required that the photovoltaic leakage current must use Type B, which is a current sensor that can measure both AC and DC leakage. Therefore, we can configure IVY Metering's leakage current sensor in the power distribution system containing photovoltaic power supply to achieve high isolation voltage level B-type leakage current detection.
This series of products is based on the principle of mutual inductance + self-designed data processing technology methods, and meets both AC and DC tests. It is equipped with the self-developed internal integrated self-check function Self-Check module. The measurement accuracy is less than 1% in most cases, and the response speed is fast. Effectively realizes reliable protection of complex leakage currents in power distribution systems containing photovoltaic power sources, and meets the requirements of national, European and American standards. It can accurately protect in the face of sudden leakage faults and is selective in multi-level protection, solving the problem of The pain point of traditional leakage current detection is very cost-effective.
