With the widespread use of photovoltaic equipment, its long-term exposure to the outdoors exposes it to serious lightning strikes and power surges. In order to ensure the stable operation and long service life of photovoltaic equipment, it is crucial to choose the right surge protective device (SPD). This article will provide you with a detailed analysis of the selection method of photovoltaic surge protectors, helping you to provide comprehensive lightning protection for photovoltaic equipment.
1. Selection of SPD on the AC side.
For the AC side of the PV system, we should follow GB T 1880232 and IEC 60364-5-53:2015 Chapter 534. It is important to note that the voltage between the AC wire and ground depends on the inverter technology and may have voltage waveform distortions, such as significant spikes, also known as harmonic interference. Therefore, when selecting the AC side SPD, in addition to the conventional parameters, special attention should be paid to its anti-harmonic function.
EPO-40CL series pluggable photovoltaic lightning protector has a 2000V isolation module, which can effectively avoid harmonic interference of the system and ensure the level of low voltage protection. This product is ideal for surge protection in photovoltaic AC systems.
Second, the selection of DC side SPD.
For the DC side of a PV system, only SPDs designed for the DC side of the PV can be installed due to their specific UI characteristics. These SPDs are required to comply with IEC 61643-31. When it comes to sizing, we need to focus on two key parameters: UCPV and ISCPV. The UCPV should be greater than or equal to the maximum open-circuit voltage of the PV array under all conditions of use, uoc max. ISCPVs, on the other hand, need to meet the additional requirements when the battery is connected to a DC circuit.
In addition, depending on whether the DC side of the PV system is grounded or not, the internal connection of the SPD will also be different. For grounding systems, there are Type I and Type L options; For non-grounded systems, there are three ways: Y-shaped, triangular, and U-shaped. Typically, PV systems use ungrounded systems.
The Eyzao DC surge protector adopts Y-type full symmetrical protection design, and is equipped with corresponding surge protectors according to different voltage levels. Its anti-vibration pluggable module keeps the product stable during transportation and current discharge. The large arc shield increases the creepage distance and greatly reduces the risk of fire. In addition, a variety of mounting modes include PCB mounting with and without pedestals and DIN rail mounting to meet the needs of various photovoltaic system scenarios.
In order to ensure the stable operation and prolonged service life of photovoltaic equipment, it is crucial to choose the right surge protector. In the selection of SPDs on the AC side and DC side, we need to focus on several key parameters and system characteristics. With its rich product line and professional R&D strength, EYZAO provides comprehensive and efficient lightning protection solutions for photovoltaic equipment. Through the introduction of this article, we hope to help you better understand how to choose the right surge protector for your photovoltaic equipment, so as to protect your photovoltaic system.
Editor in charge: Xiao Yi.