Fuse selection and energy storage industry application analysis

As the core component of circuit protection, fuses play an irreplaceable role in power systems, new energy and other fields. Especially in the energy storage industry, the scientific nature of their selection is directly related to the safety and stability of the system. This article will focus on the fuse selection rules and core precautions, combined with the application characteristics of the energy storage industry, sort out the professional selection logic, and provide practical reference for industry practitioners. Among them, the Ceramic Body (ceramic body) is the core structural component of the fuse, and its performance has a key impact on the breaking capacity and insulation effect of the fuse.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

When selecting a fuse, you must first understand the meaning of its identification letters. The first letter indicates the functional level: "a" represents partial range protection (backup protection fuse), "g" represents full range protection (general purpose fuse). The second letter indicates the protected object: "G" corresponds to cable and wire protection, "M" corresponds to switching electrical protection (motor circuit), "R" corresponds to semiconductor protection (rectifier protection), and "L" corresponds to cable and wire protection (according to specific standards). In energy storage systems, the local range protection type is currently used more to achieve more accurate overcurrent protection.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In energy storage systems, fuses are mainly used for overcurrent and short-circuit protection of Ceramic Body for Siemens LV HRC Fuse packs, DC side circuits and power conversion systems. Since energy storage systems have high requirements for safety, reliability and environmental adaptability, special attention should be paid to rated voltage (usually higher), breaking capacity (to cope with large short-circuit currents) and long-term operation durability when selecting. In addition, changes in ambient temperature have a significant impact on the performance of the fuse, and it needs to be calibrated based on actual working conditions. The current energy storage industry has put forward higher requirements for the fusing characteristics, I²t matching and surge resistance of fuses to ensure the stable operation of the system in complex electrical environments.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rated current: refers to the nominal rated current of the fuse, that is, the maximum current value that the circuit can operate normally. Rated voltage: refers to the nominal rated voltage of the fuse, that is, the maximum voltage that the fuse can withstand after it is disconnected. Ambient temperature: The higher the temperature, the hotter the fuse works and the shorter its life. The influence of actual operating temperature on operating characteristics needs to be considered when selecting.

 

Voltage drop/cold resistance: The resistance value is inversely proportional to the rated current. The smaller the resistance, the lower the power loss. This parameter specifies the maximum voltage drop or cold resistance value. Although it is not used as a basis for acceptance, it has an impact on efficiency. Fusing characteristics (time-current characteristics): It is the most important electrical performance indicator, reflecting the fusing time range under different overload currents. Under overload conditions, the melt gradually heats up until it fuses. Under different standards, the maximum non-fuse current is different (such as 110%In, 150%In, etc.), and there are also different requirements for the minimum fuse current.

 

Breaking capacity: It is the most critical safety indicator, which refers to the maximum current that the fuse can safely cut off at the rated voltage. Breaking capacity depends on structure and material. It is recommended to use products with high breaking capacity for high-voltage or main power input circuits, while products with lower breaking capacity can be used for low-voltage secondary circuits. Melting heat energy value (I²t): represents the energy required for melting. When selecting the fuse, make sure that the melting heat energy value of the fuse is greater than the energy value released by the surge current that may occur in the circuit to ensure reliable operation.

 

Durability/life: Under fault-free conditions, the fuse life is almost as long as the equipment. Standard test methods include on-off cycle tests, etc. Under normal storage conditions, the validity period is not less than two years, and it can continue to be used after passing the re-inspection. The composition of the fusing time is divided into pre-arc time (from the generation of overcurrent to the beginning of arc formation) and arc flash time (from the appearance of the arc to its extinction). Among qualified products, pre-arc time accounts for the dominant part. The use of I-t curve and I-t table: The I-t curve is used to initially select the rated current specification, and the closest curve representative specification is selected according to the protection requirements. The I-t table is used for verification and acceptance. It determines whether the protection requirements are met through the measured fuse characteristics and ensures good consistency.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Our company provides Energy Storage Fuse Ceramic Body products suitable for various overload and short-circuit protection scenarios. Our ceramic shells have excellent insulation properties, mechanical strength and heat resistance, and can be adapted to a variety of fuse design parameters to help improve the safety and reliability of fuses in energy storage and automotive electrical systems. Welcome to contact us for more technical parameters and selection support.