Key standards for energy storage fuses and ESS fuses
1. The IEC60269-7 standard has higher requirements for breaking capacity, increasing from 8KA to over 30KA.
2. The time constant requirements for the breaking ability are different. The IEC60269-7 standard requires a time constant of 1ms-3ms. The resistance of energy storage systems is low, the time constant is small, and the new standard is closer to the practical application of energy storage systems.
3. IEC60269-4 is used for semiconductor fuses. The current I2T shock that semiconductor devices or circuits can withstand is very small. Otherwise, semiconductors are easily burned out. Therefore, matching fuses require a very small I2T, which is smaller than the I2T that semiconductors can withstand. When using semiconductor protection fuses (aR high-speed semiconductor fuses or gR fuses) in energy storage systems, the next level of protection usually requires the use of fuses with higher rated values to achieve layered protection. However, fuses with increased ratings are more disadvantageous for low amplitude overload protection.
