Magnetics meet 1500V battery energy storage requirements
Summary
It is also important is to specify a signal transformer that integrates a common mode choke to meet the demanding isolation and EMI filter requirements on isoSPI communication buses in a battery energy storage system (BESS). At the same time, it should provide the necessary matching and common mode noise removal so that the communications between the monitoring ICs and the central management board are also secure and uninterrupted. Surge tests are used to primarily check that there is adequate clearance, so that if an event, such as a lightning strike, were to occur, the gap between the windings on the transformer would not break down and ionise causing a crossover. It has become a requirement to use transformers with reinforced insulation at the point of entry into networks, especially if the battery management board could be exposed to enable testing and diagnostics by a technician. If the racks that hold battery modules are shielded by plastic walls and use transformers for communications in a daisy chain configuration, they will not require reinforced insulation.